The physical or mechanical action of the LUNGS; DIAPHRAGM; RIBS; and CHEST WALL during respiration. It includes airflow, lung volume, neural and reflex controls, mechanoreceptors, breathing patterns, etc.
The capability of the LUNGS to distend under pressure as measured by pulmonary volume change per unit pressure change. While not a complete description of the pressure-volume properties of the lung, it is nevertheless useful in practice as a measure of the comparative stiffness of the lung. (From Best & Taylor's Physiological Basis of Medical Practice, 12th ed, p562)
Physiologically, the opposition to flow of air caused by the forces of friction. As a part of pulmonary function testing, it is the ratio of driving pressure to the rate of air flow.
Measurement of the amount of air that the lungs may contain at various points in the respiratory cycle.
Any method of artificial breathing that employs mechanical or non-mechanical means to force the air into and out of the lungs. Artificial respiration or ventilation is used in individuals who have stopped breathing or have RESPIRATORY INSUFFICIENCY to increase their intake of oxygen (O2) and excretion of carbon dioxide (CO2).
The exchange of OXYGEN and CARBON DIOXIDE between alveolar air and pulmonary capillary blood that occurs across the BLOOD-AIR BARRIER.
A method of mechanical ventilation in which pressure is maintained to increase the volume of gas remaining in the lungs at the end of expiration, thus reducing the shunting of blood through the lungs and improving gas exchange.
The extra volume of air that can be expired with maximum effort beyond the level reached at the end of a normal, quiet expiration. Common abbreviation is ERV.
RESPIRATORY MUSCLE contraction during INHALATION. The work is accomplished in three phases: LUNG COMPLIANCE work, that required to expand the LUNGS against its elastic forces; tissue resistance work, that required to overcome the viscosity of the lung and chest wall structures; and AIRWAY RESISTANCE work, that required to overcome airway resistance during the movement of air into the lungs. Work of breathing does not refer to expiration, which is entirely a passive process caused by elastic recoil of the lung and chest cage. (Guyton, Textbook of Medical Physiology, 8th ed, p406)
The force per unit area that the air exerts on any surface in contact with it. Primarily used for articles pertaining to air pressure within a closed environment.
Mechanical devices used to produce or assist pulmonary ventilation.
The volume of air inspired or expired during each normal, quiet respiratory cycle. Common abbreviations are TV or V with subscript T.
A syndrome characterized by progressive life-threatening RESPIRATORY INSUFFICIENCY in the absence of known LUNG DISEASES, usually following a systemic insult such as surgery or major TRAUMA.
Either of the pair of organs occupying the cavity of the thorax that effect the aeration of the blood.
These include the muscles of the DIAPHRAGM and the INTERCOSTAL MUSCLES.
Physiological processes and properties of the RESPIRATORY SYSTEM as a whole or of any of its parts.
The branch of physics which deals with the motions of material bodies, including kinematics, dynamics, and statics. When the laws of mechanics are applied to living structures, as to the locomotor system, it is referred to as BIOMECHANICAL PHENOMENA. (From Dorland, 28th ed)
Measurement of the various processes involved in the act of respiration: inspiration, expiration, oxygen and carbon dioxide exchange, lung volume and compliance, etc.
The volume of air remaining in the LUNGS at the end of a normal, quiet expiration. It is the sum of the RESIDUAL VOLUME and the EXPIRATORY RESERVE VOLUME. Common abbreviation is FRC.
The measurement of frequency or oscillation changes.
The posture of an individual lying face down.
The total volume of gas inspired or expired per unit of time, usually measured in liters per minute.
The act of BREATHING in.
The act of BREATHING out.
The upper part of the trunk between the NECK and the ABDOMEN. It contains the chief organs of the circulatory and respiratory systems. (From Stedman, 25th ed)
Deliberate introduction of air into the peritoneal cavity.
The outer margins of the thorax containing SKIN, deep FASCIA; THORACIC VERTEBRAE; RIBS; STERNUM; and MUSCLES.
Measurement of oxygen and carbon dioxide in the blood.
The act of breathing with the LUNGS, consisting of INHALATION, or the taking into the lungs of the ambient air, and of EXHALATION, or the expelling of the modified air which contains more CARBON DIOXIDE than the air taken in (Blakiston's Gould Medical Dictionary, 4th ed.). This does not include tissue respiration (= OXYGEN CONSUMPTION) or cell respiration (= CELL RESPIRATION).
Resistance and recovery from distortion of shape.
Techniques for effecting the transition of the respiratory-failure patient from mechanical ventilation to spontaneous ventilation, while meeting the criteria that tidal volume be above a given threshold (greater than 5 ml/kg), respiratory frequency be below a given count (less than 30 breaths/min), and oxygen partial pressure be above a given threshold (PaO2 greater than 50mm Hg). Weaning studies focus on finding methods to monitor and predict the outcome of mechanical ventilator weaning as well as finding ventilatory support techniques which will facilitate successful weaning. Present methods include intermittent mandatory ventilation, intermittent positive pressure ventilation, and mandatory minute volume ventilation.
The volume of air contained in the lungs at the end of a maximal inspiration. It is the equivalent to each of the following sums: VITAL CAPACITY plus RESIDUAL VOLUME; INSPIRATORY CAPACITY plus FUNCTIONAL RESIDUAL CAPACITY; TIDAL VOLUME plus INSPIRATORY RESERVE VOLUME plus functional residual capacity; or tidal volume plus inspiratory reserve volume plus EXPIRATORY RESERVE VOLUME plus residual volume.
A type of stress exerted uniformly in all directions. Its measure is the force exerted per unit area. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Non-therapeutic positive end-expiratory pressure occurring frequently in patients with severe airway obstruction. It can appear with or without the administration of external positive end-expiratory pressure (POSITIVE-PRESSURE RESPIRATION). It presents an important load on the inspiratory muscles which are operating at a mechanical disadvantage due to hyperinflation. Auto-PEEP may cause profound hypotension that should be treated by intravascular volume expansion, increasing the time for expiration, and/or changing from assist mode to intermittent mandatory ventilation mode. (From Harrison's Principles of Internal Medicine, 12th ed, p1127)
Measurement of volume of air inhaled or exhaled by the lung.
The properties, processes, and behavior of biological systems under the action of mechanical forces.
Any disorder marked by obstruction of conducting airways of the lung. AIRWAY OBSTRUCTION may be acute, chronic, intermittent, or persistent.
A condition of the newborn marked by DYSPNEA with CYANOSIS, heralded by such prodromal signs as dilatation of the alae nasi, expiratory grunt, and retraction of the suprasternal notch or costal margins, mostly frequently occurring in premature infants, children of diabetic mothers, and infants delivered by cesarean section, and sometimes with no apparent predisposing cause.
Failure to adequately provide oxygen to cells of the body and to remove excess carbon dioxide from them. (Stedman, 25th ed)
Measure of the maximum amount of air that can be expelled in a given number of seconds during a FORCED VITAL CAPACITY determination . It is usually given as FEV followed by a subscript indicating the number of seconds over which the measurement is made, although it is sometimes given as a percentage of forced vital capacity.
Procedure in which patients are induced into an unconscious state through use of various medications so that they do not feel pain during surgery.
The continuous measurement of physiological processes, blood pressure, heart rate, renal output, reflexes, respiration, etc., in a patient or experimental animal; includes pharmacologic monitoring, the measurement of administered drugs or their metabolites in the blood, tissues, or urine.
The period following a surgical operation.
Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment.
Any of various animals that constitute the family Suidae and comprise stout-bodied, short-legged omnivorous mammals with thick skin, usually covered with coarse bristles, a rather long mobile snout, and small tail. Included are the genera Babyrousa, Phacochoerus (wart hogs), and Sus, the latter containing the domestic pig (see SUS SCROFA).
A colorless, odorless gas that can be formed by the body and is necessary for the respiration cycle of plants and animals.
An element with atomic symbol O, atomic number 8, and atomic weight [15.99903; 15.99977]. It is the most abundant element on earth and essential for respiration.
The movement and the forces involved in the movement of the blood through the CARDIOVASCULAR SYSTEM.
A disease of chronic diffuse irreversible airflow obstruction. Subcategories of COPD include CHRONIC BRONCHITIS and PULMONARY EMPHYSEMA.
The behaviors of materials under force.
A purely physical condition which exists within any material because of strain or deformation by external forces or by non-uniform thermal expansion; expressed quantitatively in units of force per unit area.
An infant during the first month after birth.
The theory that the radiation and absorption of energy take place in definite quantities called quanta (E) which vary in size and are defined by the equation E=hv in which h is Planck's constant and v is the frequency of the radiation.
A twisting deformation of a solid body about an axis. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group.

Expiratory and inspiratory chest computed tomography and pulmonary function tests in cigarette smokers. (1/2868)

This study evaluated small airway dysfunction and emphysematous destruction of lung parenchyma in cigarette smokers, using chest expiratory high-resolution computed tomography (HRCT) and pulmonary function tests (PFT). The degree of emphysematous destruction was classified by visual scoring (VS) and the average HRCT number at full expiration/full inspiration (E/I ratio) calculated in 63 male smokers and 10 male nonsmokers (group A). The Brinkman smoking index (BI), defined as cigarettes x day(-1) x yrs, was estimated. Sixty-three smokers were divided into three groups by PFT: group B1 (n=7), with normal PFT; group B2 (n=21), with diffusing capacity of the lung for carbon monoxide (DL,CO) > or = 80% predicted, forced expiratory volume in one second (FEV1) < 80% pred and/or residual volume (RV) > 120% pred; and group B3 (n=35), with DL,CO < 80% pred, FEV1 < 80% pred and/or RV > 120% pred. Heavy smokers (BI > or = 600) (n=48) showed a significant increase in emphysema by both VS and E/I. E/I was significantly elevated in both group B2 (mean+/-SD 0.95+/-0.05) and B3 (0.96+/-0.06) compared with group B1 (0.89+/-0.03). VS could not differentiate group B2 (3.9+/-5.0) from B1 (1.1+/-1.6). These findings suggest that the expiration/inspiration ratio reflects hyperinflation and airway obstruction, regardless of the functional characteristics of emphysema, in cigarette smokers.  (+info)

Differences in spontaneous breathing pattern and mechanics in patients with severe COPD recovering from acute exacerbation. (2/2868)

The aims of this study were to assess spontaneous breathing patterns in patients with chronic obstructive pulmonary disease (COPD) recovering from acute exacerbation and to assess the relationship between different breathing patterns and clinical and functional parameters of respiratory impairment. Thirty-four COPD patients underwent assessment of lung function tests, arterial blood gases, haemodynamics, breathing pattern (respiratory frequency (fR), tidal volume (VT), inspiratory and expiratory time (tI and tE), duty cycle (tI/ttot), VT/tI) and mechanics (oesophageal pressure (Poes), work of breathing (WOB), pressure-time product and index, and dynamic intrinsic positive end-expiratory pressure (PEEPi,dyn)). According to the presence (group 1) or absence (group 2) of Poes swings during the expiratory phase (premature inspiration), 20 (59%) patients were included in group 1 and 14 (41%) in group 2. Premature inspirations were observed 4.5+/-6.4 times x min(-1) (range 1-31), i.e. 20+/-21% (3.7-100%) of total fR calculated from VT tracings. In group 1 the coefficient of variation in VT, tE, tI/ttot, PEEPi,dyn, Poes and WOB of the eight consecutive breaths immediately preceding the premature inspiration was greater than that of eight consecutive breaths in group 2. There were no significant differences in the assessed parameters between the two groups in the overall population, whereas patients with chronic hypoxaemia in group 1 showed a more severe impairment in clinical conditions, mechanics and lung function than hypoxaemic patients in group 2. In spontaneously breathing patients with chronic obstructive pulmonary disease recovering from an acute exacerbation, detectable activity of inspiratory muscles during expiration was found in more than half of the cases. This phenomenon was not associated with any significant differences in anthropometric, demographic, physiological or clinical characteristics.  (+info)

Respiratory muscle involvement in multiple sclerosis. (3/2868)

Respiratory complications are common in the terminal stages of multiple sclerosis and contribute to mortality in these patients. When respiratory motor pathways are involved, respiratory muscle weakness frequently occurs. Although it is well established that weakness of the respiratory muscles produces a restrictive ventilatory defect, the degree of muscle weakness and pulmonary function are poorly related. Respiratory muscle weakness was observed in patients with normal or near normal pulmonary function. Expiratory muscle weakness is more prominent than inspiratory muscle weakness and may impair performance of coughing. Subsequently, in addition to bulbar dysfunction, respiratory muscle weakness may contribute to ineffective coughing, pneumonia, and sometimes even acute ventilatory failure may ensue. Respiratory muscle weakness may also occur early in the course of the disease. Recent studies suggest that the respiratory muscles can be trained for both strength and endurance in multiple sclerosis patients. Whether respiratory muscle training delays the development of respiratory dysfunction and subsequently improves exercise capacity and cough efficacy, prevents pulmonary complications or prolongs survival in the long-term remains to be determined.  (+info)

Stroke volume decline during prolonged exercise is influenced by the increase in heart rate. (4/2868)

This study determined whether the decline in stroke volume (SV) during prolonged exercise is related to an increase in heart rate (HR) and/or an increase in cutaneous blood flow (CBF). Seven active men cycled for 60 min at approximately 57% peak O2 uptake in a neutral environment (i.e., 27 degrees C, <40% relative humidity). They received a placebo control (CON) or a small oral dose (i.e., approximately 7 mg) of the beta1-adrenoceptor blocker atenolol (BB) at the onset of exercise. At 15 min, HR and SV were similar during CON and BB. From 15 to 55 min during CON, a 13% decline in SV was associated with an 11% increase in HR and not with an increase in CBF. CBF increased mainly from 5 to 15 min and remained stable from 20 to 60 min of exercise in both treatments. However, from 15 to 55 min during BB, when the increase in HR was prevented by atenolol, the decline in SV was also prevented, despite a normal CBF response (i.e., similar to CON). Cardiac output was similar in both treatments and stable throughout the exercise bouts. We conclude that during prolonged exercise in a neutral environment the decline in SV is related to the increase in HR and is not affected by CBF.  (+info)

Heart rate during exercise with leg vascular occlusion in spinal cord-injured humans. (5/2868)

Feed-forward and feedback mechanisms are both important for control of the heart rate response to muscular exercise, but their origin and relative importance remain inadequately understood. To evaluate whether humoral mechanisms are of importance, the heart rate response to electrically induced cycling was studied in participants with spinal cord injury (SCI) and compared with that elicited during volitional cycling in able-bodied persons (C). During voluntary exercise at an oxygen uptake of approximately 1 l/min, heart rate increased from 66 +/- 4 to 86 +/- 4 (SE) beats/min in seven C, and during electrically induced exercise at a similar oxygen uptake in SCI it increased from 73 +/- 3 to 110 +/- 8 beats/min. In contrast, blood pressure increased only in C (from 88 +/- 3 to 99 +/- 4 mmHg), confirming that, during exercise, blood pressure control is dominated by peripheral neural feedback mechanisms. With vascular occlusion of the legs, the exercise-induced increase in heart rate was reduced or even eliminated in the electrically stimulated SCI. For C, heart rate tended to be lower than during exercise with free circulation to the legs. Release of the cuff elevated heart rate only in SCI. These data suggest that humoral feedback is of importance for the heart rate response to exercise and especially so when influence from the central nervous system and peripheral neural feedback from the working muscles are impaired or eliminated during electrically induced exercise in individuals with SCI.  (+info)

Breathing responses to small inspiratory threshold loads in humans. (6/2868)

To investiage the effect of inspiratory threshold load (ITL) on breathing, all previous work studied loads that were much greater than would be encountered under pathophysiological conditions. We hypothesized that mild ITL from 2.5 to 20 cmH2O is sufficient to modify control and sensation of breathing. The study was performed in healthy subjects. The results demonstrated that with mild ITL 1) inspiratory difficulty sensation could be perceived at an ITL of 2.5 cmH2O; 2) tidal volume increased without change in breathing frequency, resulting in hyperpnea; and 3) although additional time was required for inspiratory pressure to attain the threshold before inspiratory flow was initiated, the total inspiratory muscle contraction time remained constant. This resulted in shortening of the available time for inspiratory flow, so that the tidal volume was maintained or increased by significant increase in mean inspiratory flow. On the basis of computer simulation, we conclude that the mild ITL is sufficient to increase breathing sensation and alter breathing control, presumably aiming at maintaining a certain level of ventilation but minimizing the energy consumption of the inspiratory muscles.  (+info)

Capsaicin-sensitive C-fiber-mediated protective responses in ozone inhalation in rats. (7/2868)

To assess the role of lung sensory C fibers during and after inhalation of 1 part/million ozone for 8 h, we compared breathing pattern responses and epithelial injury-inflammation-repair in rats depleted of C fibers by systemic administration of capsaicin as neonates and in vehicle-treated control animals. Capsaicin-treated rats did not develop ozone-induced rapid, shallow breathing. Capsaicin-treated rats showed more severe necrosis in the nasal cavity and greater inflammation throughout the respiratory tract than did control rats exposed to ozone. Incorporation of 5-bromo-2'-deoxyuridine (a marker of DNA synthesis associated with proliferation) into terminal bronchiolar epithelial cells was not significantly affected by capsaicin treatment in rats exposed to ozone. However, when normalized to the degree of epithelial necrosis present in each rat studied, there was less 5-bromo-2'-deoxyuridine labeling in the terminal bronchioles of capsaicin-treated rats. These observations suggest that the ozone-induced release of neuropeptides does not measurably contribute to airway inflammation but may play a role in modulating basal and reparative airway epithelial cell proliferation.  (+info)

Acinar flow irreversibility caused by perturbations in reversible alveolar wall motion. (8/2868)

Mixing associated with "stretch-and-fold" convective flow patterns has recently been demonstrated to play a potentially important role in aerosol transport and deposition deep in the lung (J. P. Butler and A. Tsuda. J. Appl. Physiol. 83: 800-809, 1997), but the origin of this potent mechanism is not well characterized. In this study we hypothesized that even a small degree of asynchrony in otherwise reversible alveolar wall motion is sufficient to cause flow irreversibility and stretch-and-fold convective mixing. We tested this hypothesis using a large-scale acinar model consisting of a T-shaped junction of three short, straight, square ducts. The model was filled with silicone oil, and alveolar wall motion was simulated by pistons in two of the ducts. The pistons were driven to generate a low-Reynolds-number cyclic flow with a small amount of asynchrony in boundary motion adjusted to match the degree of geometric (as distinguished from pressure-volume) hysteresis found in rabbit lungs (H. Miki, J. P. Butler, R. A. Rogers, and J. Lehr. J. Appl. Physiol. 75: 1630-1636, 1993). Tracer dye was introduced into the system, and its motion was monitored. The results showed that even a slight asynchrony in boundary motion leads to flow irreversibility with complicated swirling tracer patterns. Importantly, the kinematic irreversibility resulted in stretching of the tracer with narrowing of the separation between adjacent tracer lines, and when the cycle-by-cycle narrowing of lateral distance reached the slowly growing diffusion distance of the tracer, mixing abruptly took place. This coupling of evolving convective flow patterns with diffusion is the essence of the stretch-and-fold mechanism. We conclude that even a small degree of boundary asynchrony can give rise to stretch-and-fold convective mixing, thereby leading to transport and deposition of fine and ultrafine aerosol particles deep in the lung.  (+info)

TY - JOUR. T1 - Comparative respiratory system mechanics in rodents. AU - Gomes, R. F.M.. AU - Shen, X.. AU - Ramchandani, R.. AU - Tepper, R. S.. AU - Bates, J. H.T.. PY - 2000/12/1. Y1 - 2000/12/1. N2 - Because of the wide utilization of rodents as animal models in respiratory research and the limited data on measurements of respiratory input impedance (Zrs) in small animals, we measured Zrs between 0.25 and 9.125 Hz at different levels (0-7 hPa) of positive end-expiratory pressure (PEEP) in mice, rats, guinea pigs, and rabbits using a computer-controlled small-animal ventilator (Schuessler TF and Bates JHT, IEEE Trans Biomed Eng 42: 860-866, 1995). Zrs was fitted with a model, including a Newtonian resistance (R) and inertance in series with a constant-phase tissue compartment characterized by tissue damping (Gti) and elastance (Hti) parameters. Inertance was negligible in all cases. R, Gti, and Hti were normalized to body weight, yielding normalized R, Gti, and Hti (NHti), respectively. ...
The pattern of breathing was modified markedly by increasing the level of pressure support, with increased tidal volume and reductions in respiratory rate, WOB and P0.1. Furthermore, our data indicate that arterial carbon dioxide tension, minute ventilation and inspiratory flow were maintained nearly constant, independent of pressure support level. This suggests that there are different mechanisms of adaptation resulting in different breathing patterns at different levels of pressure support, from a pattern similar to rapid shallow breathing (pressure support at 5 cmH2O) to one similar to completely passive pressure control ventilation (pressure support at 25 cmH2O). The relationship we found between respiratory rate and tidal volume, for different f/Vt isopleths, was similar to that reported by Yang and Tobin [20] in spontaneously breathing individuals. Few previous studies have systematically investigated the effects of pressure support level on breathing pattern in non-COPD patients with ...
View Lab Report - PEX-07-02_ from SCIN 132 at American Military University. Name: Dustin Geiss Exercise 7: Respiratory System Mechanics: Activity 2: Comparative Spirometry Lab Report Pre-lab Quiz
TY - JOUR. T1 - Lung parenchymal mechanics. AU - Suki, Béla. AU - Stamenović, Dimitrije. AU - Hubmayr, Rolf. PY - 2011/7/1. Y1 - 2011/7/1. N2 - The lung parenchyma comprises a large number of thin-walled alveoli, forming an enormous surface area, which serves to maintain proper gas exchange. The alveoli are held open by the transpulmonary pressure, or prestress, which is balanced by tissues forces and alveolar surface film forces. Gas exchange efficiency is thus inextricably linked to three fundamental features of the lung: parenchymal architecture, prestress, and the mechanical properties of the parenchyma. The prestress is a key determinant of lung deformability that influences many phenomena including local ventilation, regional blood flow, tissue stiffness, smooth muscle contractility, and alveolar stability. The main pathway for stress transmission is through the extracellular matrix. Thus, the mechanical properties of the matrix play a key role both in lung function and biology. These ...
In this second posting on this topic, I will attempt to bring together some of the latest research that I have found regarding a very controversial topic of respiratory system weakness. In other words, there is something about your respiratory system that is limiting performance. How does this happen?. I propose, here, a different type of zoning. Most people talk about fat burning zones, or carb burning zones, or threshold power. I propose here zoning based on respiratory mechanics, and, especially if your primary weakness is based on respiratory mechanics.. You say what???. Many, many coaches have shot me down for making such a comment. They say that the respiratory muscles are sometimes insignificant in the overall production of a PB performance. Many of these traditional coaches also think that to succeed, you must be training hard or long all the time, and you must have a winning attitude. I dont disagree with the psychological aspect of a PB performance, but instead of training hard or ...
The mechanisms leading to patient/ventilator asynchrony has never been systematically assessed. We studied the possible association between asynchrony and respiratory mechanics in patients ready to be enrolled for a home non-invasive ventilatory program. Secondarily, we looked for possible differences in the amount of asynchronies between obstructive and restrictive patients and a possible role of asynchrony in influencing the tolerance of non-invasive ventilation (NIV). The respiratory pattern and mechanics of 69 consecutive patients with chronic respiratory failure were recorded during spontaneous breathing. After that patients underwent non-invasive ventilation for 60 minutes with a dedicated NIV platform in a pressure support mode during the day. In the last 15 minutes of this period, asynchrony events were detected and classified as ineffective effort (IE), double triggering (DT) and auto-triggering (AT). The overall number of asynchronies was not influenced by any variable of respiratory
Hantos Zoltán, Czövek Dorottya, Gyurkovics Zita, Szabó Hajnalka, Maár A. Balázs, Radics Bence, Virág Katalin, Makan Gergely, Orvos Hajnalka, Gingl Zoltán, Sly D. Peter. ...
Here is something I had published this week in The McPherson News a weekly newspaper in McPherson, Ks. (Link is - - http://www.mcphersonweeklynews.com/copd-living-one-breath-at-a-time/ ) I give some statistics as well as facts and myths of COPD - letting folks know that this is COPD Awareness Month. Enjoy! COPD - Living One Breath at a Time By…
During dynamic exercise, the healthy pulmonary system faces several major challenges, including decreases in mixed venous oxygen content and increases in mixed venous carbon dioxide
The respiratory control system consists of a motor arm which executes the act of breathing, a contol center located in the medulla and a number of mechanisms that convey information to the control...
Although recent evidence demonstrates considerable neuroplasticity in the respiratory control system, a comprehensive conceptual framework is lacking. Our goals in this review are to define plasticity (and related neural properties) as it pertains to
A computer-controlled gas-mixing system that manipulates inspired CO2 and O2 on a breath-to-breath basis has been developed. The system uses pairs of solenoid valves, one pair for each gas. These valves can either be fully shut when a low voltage is applied, or fully open when a high voltage is applied. The valves cycle open and shut every 1/12 s. A circuit converts signals from the computer, which dictates the flows of the gases, into a special form for driving the valve pairs. These signals determine the percentage of time within the 1/12-s cycle each valve spends in a open state and the percentage of time it spends shut, which, in effect, set the average flows of the various gases to the mixing chamber. The delay for response of the system to commanded CO2 or O2 changes is less than 200 ms. The system has application for the manipulation of inspired gas fractions so as to achieve desired end-tidal forcing functions.
Tissue MechanicsStephen C. Cowin and Stephen B. Doty Tissue Mechanics, Second Edition is about the mechanics of tissues for use at the advanced
PowerLung products are designed to be used for exercise only. Any other use is not recommended. PowerLung products are not intended to diagnose, treat, cure or prevent any disease. Consult physician before using PowerLung products if you have a medical condition. Consult your physician before beginning this or any exercise program ...
Weve all been there. There is too much going on in our lives: we just started a new job, moved into a new apartment, and experienced a death in the family all in the same month, and the stress over it all is piling up like dirty laundry. No matter what youve been through with addiction or what you are currently going through on your road to recovery, it seems that stress knows where you hide, and finds you often. While it is certainly a part of being human, the negative effects that stress has on our bodies are scary-and almost unbelievable. Cortisol, the hormone responsible for stress, can literally transform the cells in your brain into ones that prevent communication with your prefrontal cortex, the area responsible for not only learning and memory, but anxiety, depression, and other mood disorders.
Robert H. Brown, Alkis Togias Measurement of intra-individual airway tone heterogeneity and its importance in asthma J Appl Physiol 121: 223-232, 2016; DOI: 10.1152/japplphysiol.00545.2015. ...
Chronic Obstructive Pulmonary Disease (COPD) is associated with nighttime respiratory symptoms, poor sleep quality, and increased risk of nocturnal mortality. Overnight deterioration of inspiratory capacity (IC) and forced expiratory volume in 1 second (FEV1) have previously been documented. However, the precise nature of this deterioration and mechanisms by which evening bronchodilators may mitigate this have not been studied.To determine the effect of evening dosing of dual, long-acting bronchodilators on detailed nocturnal respiratory mechanics and inspiratory neural drive (IND).A double-blind, randomized, placebo-controlled crossover study assessed the effects of evening long-acting bronchodilators (BD; aclidinium bromide/formoterol fumarate dihydrate, 400/12 mcg) or placebo (PL) on morning trough IC (12 hours post-dose; primary outcome) and serial overnight measurements of spirometry, dynamic respiratory mechanics and IND (secondary outcomes).20 participants with COPD (moderate/severe ...
Measurements were obtained first at zero end-expiratory pressure (ZEEP). PEEP was then applied in increments of 2 cm H20. At each PEEP level, measurements were done after patients were judged to have reached a steady state by stability of the RIP sum signal and Pao signal (usually within 1 min). End-inspiratory occlusions were obtained by pressing the inspiratory hold button of the ventilator for 5 to 6 s. During this period, the contribution of reduction in pressure due to volume loss by continuing gas exchange should be negligible. On reestablishing a steady state (usually within a few breaths), end-expiratory occlusions were done by pressing the end-expiratory hold button of the ventilator for 5 to 6 s.. All patients were studied up to a PEEP of 10 cm H20. In seven patients, higher levels of PEEP were used (up to 12 to 18 cm H20). The above measurements were then performed while PEEP was reduced stepwise to zero in decrements of 2 cm HaO. The whole procedure was repeated three times. ...
We aimed to investigate the immediate respiratory effects of cigar smoking(CS), among young smokers with and without mild asthma. Forty-seven young smokers (18-31years old, 29 males, average pack-years = 3.6 ± 2.8) were enrolled. Twenty-two were mild asthmatics(MA-subgroup) and the remaining 25 were otherwise healthy smokers(HS-subgroup). Exhaled carbon monoxide(eCO), multi-frequency respiratory system impedance(Z), resistance(R), reactance(X), frequency-dependence of resistance(fdr = R5Hz - R20Hz), resonant frequency(fres), reactance area(AX) and exhaled nitric oxide(FENO) were measured at the aforementioned sequence, before and immediately after 30 min of CS, or equal session in the smoking area while using a sham cigar(control group). Chi-square, students t-tests, mixed linear models and Pearson correlation tests were used for the statistical analysis; level of significance was defined as p | 0.05. Immediately after CS, Z5Hz, R5Hz, R10Hz, R20Hz and eCO increased significantly in both subgroups(MA
INTRODUCTION. NIH mechanical ventilation protocol is the standard of care in ARDS. However individual characteristics of respiratory mechanics may expose the lung to some degree of mechanical stress. In the present study we tested the hypotesis that combination of morphological (CT scan) and functional (static PV curve) analysis may identify patients at risk of mechanical stress. METHODS. 22 ARDS patients (NIH protective ventilatory strategy) were enrolled. Static P/V curve at zeep where obtained before CT. CT slides were achieved during end-inspiration and end-expiration hold and analyzed to detect total lung volume distribution. RESULTS. In 10 patients the tidal increase in lung volume occurred with a 30-50 % increase of hyperinflated areas. In these patients Pplat during the NIH ventilation was higher than the UIP CONCLUSION. Combined evaluation of lung morphology on respiratory mechanics identify risk of mechanical stress in ARDS patients.. ...
Whole body plethysmography is an application whereby ventilatory parameters are measured while the subject is conscious and unrestrained. By the use of bias airflow supplies, CO2 levels, temperature and humidity are maintained at normal levels enabling measurements to be made over several hours. During inspiration there is a slight net pressure rise within theplethysmograph due to increased temperature and humidity of the air as it enters the subjects lungs (gas conditioning). During normal breathing, this pressure difference is directly proportional to the respiratory pattern of the subject, allowing the researcher to measure respiratory rate and tidal volume, in accordance with ICH S7 Guidelines. The system is commonly used in airway hyper-reactivity studieswhere, in addition to changes in ventilatory parameters, valuable data can obtained by quantifying changes in the shape of the respiratory waveform, e.g., Penh. However, it should be noted that when bronchoconstriction is present, the ...
The authors investigated the effect of manual hyperinflation (MHI) with set parameters applied to patients on mechanical ventilation on hemodynamics, respiratory mechanics, and gas exchange. Sixteen critically ill patients post-septic shock, with acute lung injury, were studied. Heart rate, arterial
mweb.co.za The regulation of the pacing strategy remains poorly understood, because much of classic physiology has focused on the factors that ultimately limit, rather than regulate, exercise.. Zonein Fact Sheet. A research review regarding the impact of technology on child development, behavior, and academic performance. Infants watch 2.5 hours per day of TV, children use 7.5 and teens 9 hours per day of entertainment technologies (cell phone, TV, internet).. The brain circuitry involved in HTRS controls the sympathetic nervous system. This Review outlines evidence supporting the phenomenon of HTRS and describes the range of physiological and psychosocial.. Background. Attention deficit/hyperactivity disorder (ADHD) is a common condition among children and adolescents, and has been diagnosed with increased frequency in adults.. Exercise 7 Respiratory System Mechanics Essay EXERCISE 7 Respiratory System Mechanics O B J E C T I V E S 1. To explain how the respiratory and circulatory systems work ...
This study will evaluate the effectiveness of a flexible belt device in guiding patient breathing during computed tomography (CT)-guided needle biopsy. When patients undergo CT scanning to help guide the physician during a tissue biopsy, they are usually asked to hold their breath while the scan is taken of certain parts of the body. When the first scan is completed, the patients are allowed to breathe, and are then asked to hold their breath again while the needle is advanced towards the tissue to be biopsied. Since body organs and tissues move with breathing, this study will try to stop the patients breathing at the same place in the breathing cycle to ensure that the biopsy target stays still and in the same place. This study will see if the flexible belt, used with a computer screen that charts the patients breathing, will improve the patients ability to stop breathing at the same place in the breathing cycle before and during the biopsy.. Patients 18 years of age and older who have a ...
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The main outcome measures evaluated in the present study were the effort value, respiratory mechanics profile, ventilation mode, and type of ventilator-influenced mechanical ventilation asynchrony. Prolonged effort increased premature cycling, whereas a shorter effort was associated with delayed cycling, regardless of the type of ventilator or circuit. The obstructive respiratory mechanics profile favored delayed cycling, whereas the restrictive profile was associated with premature cycling, regardless of the ventilator type or mode. Although the PAV+ mode prevented premature cycling in most situations, it was associated with delayed cycling in the obstructive profile. The PAV+ mode also delivered lower VT values, better inspiratory time synchrony with muscle effort, and shorter inspiratory trigger delay than did PSV. The portable single-limb circuit ventilator showed better inspiratory triggering than did the conventional ICU ventilators.. To our knowledge, this is the first study to ...
in Acta Physiologica Scandinavica (2002), 174(4), 367-75. To assess the contribution of genetic background to respiratory mechanics, we developed a ventilator unit to measure lung function parameters in the mouse. We studied two commonly used inbred mice strains ... [more ▼]. To assess the contribution of genetic background to respiratory mechanics, we developed a ventilator unit to measure lung function parameters in the mouse. We studied two commonly used inbred mice strains originating from Mus musculus domesticus (C57BL/6 and C3HeB/FeJ) and a third strain derived from Mus musculus molossinus [Japanese fancy mouse 1 (JF1)]. The ventilator allows for accurate performance of the different breathing manoeuvres required for measuring in- and expiratory reserve capacity, quasi-static and dynamic compliance, and airway resistance. In combination with a mass spectrometer for monitoring gas concentrations, single-breath manoeuvres were performed and He-expirograms obtained, from which dead space ...
Symbols and their subgrouping into main symbols and modifiers are consistent with approved nomenclature formulated circa 1980 by the Commission of Respiratory Physiology (International Union of Physiological Sciences) and the Publications Committee of the American Physiological Society., The following groupings of pulmonary-respiratory symbols are adapted from Fishman. Main symbols are typically capital letters set on the line and are the first elements of an expression. The same letter may stand for one entity in respiratory mechanics and another in gas exchange (eg, P stands for pressure in respiratory mechanics and partial pressure in gas exchange). The following are examples (note
Symbols and their subgrouping into main symbols and modifiers are consistent with approved nomenclature formulated circa 1980 by the Commission of Respiratory Physiology (International Union of Physiological Sciences) and the Publications Committee of the American Physiological Society., The following groupings of pulmonary-respiratory symbols are adapted from Fishman. Main symbols are typically capital letters set on the line and are the first elements of an expression. The same letter may stand for one entity in respiratory mechanics and another in gas exchange (eg, P stands for pressure in respiratory mechanics and partial pressure in gas exchange). The following are examples (note
Assessment of pulmonary mechanics in mechanical ventilation. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.
We believe that the rigid nature of the tracheostomy tube represents reduced imposed WOB compared with the longer, thermoliable endotracheal tube. The clinical significance of this effect is small, although as respiratory rate increases, the effects are magnified. In patients in whom extubation fail …
Rheumatoid arthritis (RA) is an autoimmune disease of unknown etiology characterized by peripheral polyarthritis, symmetric, which leads to joint destruction and deformity. It is estimated that the RA reaches about 0.5% of the population. According to data from DATASUS, was responsible for 26,671 hospitalizations, 229 deaths and cost exceeding R$ 20 million in 2005-2007.. The main bodily changes are related to joint problems, however, systemic manifestations are also found in organs such as lung and heart. Although cardiovascular diseases are the most responsible of the deaths AR, pulmonary complications are common and account for 10% to 15% of all mortality. Anaya and colleagues point out that the pulmonary involvement contributes significant morbidity and mortality in these patients. Although pulmonary involvement is a frequent manifestation in RA, the prevalence and nature of rheumatoid lung disease has not yet been precisely established. Several lung disorders such as interstitial pulmonary ...
In emission tomography, the process of image reconstruction has evolved since the utilization of the filtered back projection algorithm (FBP). Nowadays, iterative techniques incorporating statistical knowledge of the photon emission process has produced much interest among researchers, not only for the improvements achieved in image quality, but also by the possibility of incorporate corrections factors, like scattering, attenuation, etc. One of the problems that has not been discussed in depth is the incorporation of correction methodologies due to patient breathing, which produces blur regions in lungs and cardiac images. Solutions like respiratory gating, that synchronize the breathing cycle of the patient and the data acquisition process, or correlated dynamic PET techniques that use external radioactive markers and list mode data, have been tested with improvements over the spatial activity distribution in lungs lesions, but with the disadvantages of requiring extra hardware or more expensive
The changes in neurochemicals within the preBötC/VMC following CBD may reflect changes in the activity of local (21) or distant neurons resulting from a loss of tonic excitatory carotid input. The first synapse of carotid afferents is in the NTS, which projects to multiple sites, including the pFRG/RTN and the serotonergic raphe nuclei (39), both of which project to the pre-BötC/VMC. Data from several studies suggest that neurons in the pFRG/RTN are inherently CO2/H+ sensitive, integrate input from multiple sources, and provide excitatory (glutamatergic) drive to multiple sites of respiratory neurons, including the preBötC (17). Thus the reduction in pFRG/RTN activity after CBD would contribute to the reduced eupneic breathing and ventilatory CO2 chemoreflex.. Similarly, 5-HT neurons in the raphe are believed to affect ventilation through inherent CO2/H+ sensitivity and the release of excitatory neuromodulators within the respiratory network. The neuromodulatory effects of 5-HT neurons occur ...
Over 1,000 scientists from all parts of the country and abroad belong to the Indian Society of Biomechanics. The society will contribute in areas such as mass healthcare, rehabilitations, cardiovascular mechanics, ergonomics, modeling and simulation of biomechanics and also in games and sports including respiratory mechanics. Now nano-biomechanics, cell and tissue mechanics are also coming up rapidly and we will have to orient ourselves in this direction as well. We aspired to have linkages with other biomechanics societies in other parts of the world.. ...
PubMed comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
Cell mechanics are considerably more complex than previously thought and may affect cell structures at various levels. This finding is based on a collaborative research project conducted by an international research team from ETH Zurich and University of Tampere, involving Teemu Ihalainen, a postdoctoral researcher at the Academy of Finland. The findings of the team were published in the Nature Materials online publication.
Full article here Breathing Pattern Disorders I was very fortunate to attend an intimately small workshop with Leon Chaitow last week discussing manual therapy approaches to breathing pattern disorders. I have not been shy about sharing how much I have learned from Chaitow and his extensive body of work, so spending a day with him was…
Ok, so first of all , im no medium (im developing it, i can see auras and such) but i do read, watch and study things like this. First of all, do you have nightmares and things like this when you sleep? What is it doing to be mean? I had a spirit at my old house when i was very young, try to get in contact with me by giving me nightmares and even haunting the basement. I only saw it once , it was very traumatizing. Well anyway, there are a few things do do here are some; 1. try to tell the spirit to back off. Tell them in a strong tone you acknowledge they are there and you dont like them scaring you. Somtimes a spirit wants attention because they wanted it more when they were alive. 2. If you can, try to get clensed by a medium or somthing if you cant get rid of this spirit 3. Ask this spirit, to tell you why its haunting you. It may sound scary but i have heard stories it works. Or if you rather not have a direct approach , try looking back to when this spirit came. What was your life at this ...
Dive into the research topics of The vertical excursion of the body visceral mass during vertical jumps is affected by specific respiratory maneuver. Together they form a unique fingerprint. ...
Bulk flow of air in between the environment and the lungs is an important respiratory function. Coordinated, active movements of the thorax and the diaphragm, result in inspiration and expiration.
I like to say that I dont let cystic fibrosis run my life, but it really does affect in in many different ways. For me, the biggest struggle has always been staying compliant with my treatments. They are a time commitment that I have not always been willing to make. When I was younger, my friends would all be outside playing, and I would have to come in to do my treatments. In high school, I had to work my treatments in around my busy schedule. When I got to college, I did my rebelling. No, I didnt go out partying or drinking or smoking. I just stopped doing my treatments and continued being non-compliant throughout my college career. It wasnt until I was threatened with the possibility of a lung transplant at age 22, that I decided to turn things around ...
Alveolar ventilation, Pulmonary ventilation, Respiratory minute volume, Air way resistance, Intra plural pressure, Pressure changes during inspiration and expiration
We are starting our fall conference season by going to ERS in Vienna. It would be great to talk to you at the joined emka/SCIREQ booth B2.04. at the Reed Messe. During the conference we would be happy to demonstrate the MSX (multi-subject extension) for our flexiVent FX to you. The MSX combines the efficiency of easily and simultaneously measuring respiratory mechanics in four parallel subjects with the highly detailed input impedance and Constant Phase Model measurements that make the flexiVent so unique. Although our chief scientist Dr. Robichaud will not be present at ERS, she has looked through the conference schedule and thought the following course and sessions could be of interest to you: ...
The tracheal cannula is used in a tracheotomy for general ventilation or respiratory mechanics studies. The outside diameter of the cannula must ensure a tigh
In Computer system air flow, both the inspiratory tension plus the inspiratory time are set and glued. This differs from BiPAP where the individual controls the inspiratory time. This modality may be useful within the neuromuscular illness patient who does not have the respiratory muscle mass toughness to generate an suitable inspiratory time. Placing a heightened inspiratory time may enhance the tidal quantity presented, nevertheless it may enhance individual-ventilator dyssynchrony if the established inspiratory time is extended compared to affected persons desired inspiratory time ...
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If you listen closely, youll notice that your babys breathing isnt like yours. Babies breathe much more frequently and with different patterns than adults. Heres how to recognize normal breathing in your infant - and how to spot signs of respiratory distress.
If you listen closely, youll notice that your babys breathing isnt like yours. Babies breathe much more frequently and with different patterns than adults. Heres how to recognize normal breathing in your infant-and how to spot signs of respiratory distress.
Effects of fresh and aged traffic-related particles on breathing pattern, cellular responses, and oxidative stress. Diaz, Edgar A.; Chung, Yeonseungresearcher; Lamoureux, Denise P.; Papapostolou, Vasileios; Lawrence, Joy; Long, Mark S.; Mazzaro, Vicente; et al, AIR QUALITY ATMOSPHERE AND HEALTH, v.6, no.2, pp.431 - 444, 2013- ...
The breath hold is an excellent diagostic tool to establish safety in performing exercise and breathing exercises. It is used by Buteyko and others.
In difficult times its not always easy to stay positive. But once you understand the science behind it and try some of these simple breathing exercises, you will begin to experience positive energy in no time!
Describes why we breathe and illustrates the respiratory system and the role of important organs such as the brain, nose, trachea, lungs heart and diaphragm. Shows what happens inside the lungs and the flow of air during the breathing process. Shows smoke-damaged alveoli. Includes fun facts (
Hi Ericka,. I also have asthma, but fortunately dont have to use my ventilator often, only with very strenuous exercise. You will definitely feel shortness of breath at higher altitude, but dont be too quick to jump to asthma causing the problem - everyone feels this lack of oxygen high up. I had a bit of trouble keeping up on the Lares trek when we hit the steep tracks, but just took my time, and took breaks if I needed them. Just be sensible and always take things slowly, theres no need to rush to the top. Also you wont be hiking for 8 hours every day, there are many stops along the way to have snacks, lunch and try your spanish out on some local kids ...
My throat is still bleeding inside a little and every once and a while it feels like the cut opens up that sends a pain across my body. It seems hard to get my breath at times and getting choked only takes not noticing where my saliva is... what little I produce these days. It is getting a bit scary again and feels much like when this all started, only this time it is on my left side of my throat and what feels the small opening and where we breath from. It tends to get on ones nerves. Denise had me take one of the nerve pills after a while of debating, I did. It did calm down the anxiety ...
The scan itself is easy. They usually last about 10 minutes. You maybe asked to partially disrobe depending what you are wearing, and put on a gown. Then you lay down on a sliding bed that will move you into the CT machine. Usually you are offered a blanket. Then you move into the machine, which is a big round ring/tube (but more open than an MRI). It will slowly move you until the appropriate body part is aligned in the proper placed, then it will move you a little more back and forward as they do the images. You may be asked to hold your breath at certain times, then let it out. This may happen for three or four cycles. When its done you may be asked to wait a few minutes while the radiologist look at the images to make sure they are done correctly. If you have an IV, theyll take it out, you get dressed and then you are done ...
This is what my Vinyasa, my step by step progression, to handstand looked like, one breath at a time:. STEP 1, plank on the forearm and baby cobra: I got on my mat every day (and continue to) for plank on the forearm and baby cobra. Consistent diligent effort. No matter my attire (sometimes still in my PJs or trickier, in tight jeans). No matter if it was first thing in the morning (preferred time) or the last thing at night (my husband would see me practicing and smile, amazed and impressed with my resolve-motivating and inspiring him and our kids).. STEP 2, handstand prep: In time, I built up the courage to do handstand prep (so hard, still so hard-requires more strength than handstand, but is less scary). I never thought I could get upside down like this when I first started consistently practicing, but again the lesson of letting go of results proved me wrong, for all of a sudden, there I was.. STEP 3 handstand prep raising one leg away from the wall, then the other: Eventually, in ...
Hi My son is 2 years old and attending creche. For the past 6 months, he has been sick, and always at the doctors, every 3 or 4 weeks. When his condition does get better, then he gets re-infected by the others at his creche. He struggles to breath at night, and very often his temperature goes to about 41 degrees. No antibiotics or medication is helping him. Last week when he went to get his blood tested, his results came back saying that his immune system is very low and may have to get immune boosters once a month at a hospital, through drips. Is this necessary? Is there any other natural way that he can have his immune system boosted. He has to be in creche, but what else can we do, to prevent him from always getting sick. ...
COPD may be a chronic condition, but living with it can be more than a difficult challenge--it can be a lifestyle change you meet with grace. Here are some resources to make coping with COPD more manageable and help you lead a healthier, happier life. Rejoin your life, one breath at a time.
Mechanical Engineering: Engineering mechanics - statics, Understand Mechanics from scratch: the one statics course you need to get started with engineering statics and mechanics.... more ›› ...
We are providing Mobile Mechanics Services in Norco. Are you looking for mobile mechanics service in your area than you can call us for instance assistance.
Video created by Universidad Duke for the course Introductory Human Physiology. We hope that you are enjoying the course! This module considers the respiratory system. In these lessons, we explore topics such as how we get air into our lungs, ...
By the time were 70 years old, we will have taken at least 600 million breaths. All of this breathing couldnt happen without the respiratory system.
Human respiratory system involves the organs responsible for breathing, i.e. exchange of gases between the organism and the environment.
Ratnovsky, Anat (2008). "Mechanics of respiratory muscles". Respiratory Physiology and Neurobiology. 163 (1-3): 82-89. doi: ... "Signs of Respiratory Distress in Children". University of Rochester Medical Center. Retrieved 11 May 2015. Netter FH. Atlas of ... Use of these while at rest is often interpreted as a sign of respiratory distress. There is no definitive list of accessory ... The diaphragm is also involved in non-respiratory functions, helping to expel vomit, faeces, and urine from the body by ...
Poggi R, Brandolese R, Bernasconi M, Manzin E, Rossi A (October 1989). "Doxofylline and respiratory mechanics. Short-term ... "Treatment plan comparison in acute and chronic respiratory tract diseases: an observational study of doxophylline vs. ... effects in mechanically ventilated patients with airflow obstruction and respiratory failure". Chest. 96 (4): 772-8. doi: ...
Leith, DE (1 Sep 1989). "Adaptations to deep breath-hold diving: respiratory and circulatory mechanics". Undersea Biomedical ... The sperm whale respiratory system has adapted to cope with drastic pressure changes when diving. The flexible ribcage allows ... Lung volume is relatively low compared to terrestrial mammals because of the inability of the respiratory tract to hold gas ... Seals, whales and porpoises have slower respiratory rates and larger tidal volume to total lung capacity ratio than land ...
2018). "The respiratory mechanics of the yacare caiman (Caiman yacare Daudine) " [sic]. Journal of Experimental Biology 2018: ...
New views on a fundamental concept of respiratory mechanics]. Zeitschrift für die Gesamte Experimentelle Medizin (in German). ... Infant respiratory distress syndrome (IRDS) is caused by lack of surfactant, commonly suffered by premature babies born before ... At the end of that decade it was discovered that the lack of surfactant caused infant respiratory distress syndrome (IRDS). " ... Humans and animals born with a congenital absence of the saposin family SP-B suffer from intractable respiratory failure ...
At the time, the respiratory muscles and the mechanics of breathing were called a "no man's land between anatomy and physiology ... 1962 The Respiratory Muscles and the Mechanics of Breathing. E.J. Moran Campbell, Department of Medicine, Middlesex Hospital, ... While working with terminally ill patients Stough realized the potential of his work for people with no respiratory faults. In ... which was the largest hospital for patients with respiratory diseases on the East Coast at the time. There he met Dr. Robert ...
Respiratory therapists, Pilots, and Mechanics.[citation needed] Traditionally the helicopter is staffed by a flight crew ... Pilots and mechanics are employees of Air Methods Corp..[citation needed] When the transport is beyond the range of the ... If advanced knowledge of the patients condition is known before takeoff, the crew may also include a respiratory therapist, ...
... on EIT-guided mechanical ventilation and outcome could demonstrate significant benefits in regard to respiratory mechanics, gas ... Expert Review of Respiratory Medicine. 9 (6): 721-737. doi:10.1586/17476348.2015.1103650. ISSN 1747-6348. PMID 26488464.. ... the respiratory cycle between in- and expiration when lung tissue becomes more conductive due to lower content of insulating ... Respiratory Physiology & Neurobiology. 233: 25-32. doi:10.1016/j.resp.2016.07.010.. ...
2020). A review of the anatomy of the respiratory systems and mechanics of breathing in living and fossil archosaurs, ... Michael Naylor Hudgins; Emma R. Schachner; Linda A. Hinnov (2020). "The evolution of respiratory systems in Theropoda and ... Robert J. Brocklehurst; Emma R. Schachner; Jonathan R. Codd; William I. Sellers (2020). "Respiratory evolution in archosaurs". ... between atmospheric O2 and CO2 levels during the Late Triassic and the evolution of skeletal pneumaticity and respiratory ...
... focusing in the relationship between respiratory mechanics and the neural mechanisms of respiratory sensation, currently a ...
Main article: Breathing § Mechanics. @media all and (max-width:720px){.mw-parser-output .tmulti>.thumbinner{width:100%! ... The Respiratory System University level (Microsoft Word document). *Lectures in respiratory physiology by noted respiratory ... The respiratory system (also respiratory apparatus, ventilatory system) is a biological system consisting of specific organs ... In humans and other mammals, the anatomy of a typical respiratory system is the respiratory tract. The tract is divided into an ...
... respiratory mechanics MeSH G09.772.770.755.700.080 - bronchoconstriction MeSH G09.772.770.755.700.275 - exhalation MeSH G09.772 ... respiratory dead space MeSH G09.772.765.765 - respiratory sounds MeSH G09.772.765.850 - total lung capacity MeSH G09.772. ... 700.390 - inhalation MeSH G09.772.770.755.760 - respiratory transport MeSH G09.772.770.755.760.602 - pulmonary gas exchange ...
... methods for non-invasive determination of passive respiratory mechanics during assisted ventilation, and Odds Ratio Product of ... He was the Head of Respiratory Medicine at the University of Manitoba 1988-1997 and Director of the sleep laboratory at the ... This was followed by a PhD in respiratory physiology at McGill University. Younes subsequently held academic appointments as a ... Theory". American Review of Respiratory Disease. 145 (1): 114-20. doi:10.1164/ajrccm/145.1.114. PMID 1731573. Younes, M.; ...
... tissues or organs to restore or establish normal function Respiratory mechanics, the branch of human physiology focusing upon ... the bio-mechanics of respiration Rhabdomyolysis, a condition in which damaged skeletal muscle tissue breaks down, potentially ...
Cardiovascular fluid mechanics research Respiratory fluid mechanics research The guiding task for biomedical fluid mechanics ... SAFL is a leader in cardiovascular fluid mechanics research using a simulation-based research approach. Novel computational ... Its primary research is in "Engineering, Environmental, Biological, and Geophysical Fluid Mechanics". It is affiliated with the ... between fluid mechanics and biology has led to growth in recent years of research aimed at understanding the fluid mechanics of ...
Macklem, Peter T..(1998)American Journal of Respiratory and Critical Care Medicine. The Mechanics of Breathing. Am. J. Respir. ...
Bourouiba, Lydia (2021-01-05). "The Fluid Dynamics of Disease Transmission". Annual Review of Fluid Mechanics. 53 (1): 473-508 ... Respiratory droplet transmission is the usual route for respiratory infections. Transmission can occur when respiratory ... consisting of saliva or mucus and other matter derived from respiratory tract surfaces. Respiratory droplets are produced ... Respiratory droplets can be produced in many ways. They can be produced naturally as a result of breathing, talking, sneezing, ...
"Persistent Improvement of Gas Exchange and Lung Mechanics by Aerosolized Perfluorocarbon". American Journal of Respiratory and ... The influence of PLV on oxygenation, carbon dioxide removal and lung mechanics has been investigated in several animal studies ... The first medical use of liquid breathing was treatment of premature babies and adults with acute respiratory distress syndrome ... In surfactant-depleted piglets, persistent improvement of gas exchange and lung mechanics was demonstrated with Aerosol-PFC. ...
Lymphatic system Respiratory system Manifolds are used in: Pipe organ Scott, John S. (1992). Dictionary Of Civil Engineering. ...
Measuring respiratory muscle strength is a long established, method of assessing the mechanics of breathing. Respiratory muscle ... Measurement of respiratory muscle function is important in the diagnosis of respiratory muscle disease, or respiratory muscle ... A respiratory pressure meter measures the maximum inspiratory and expiratory pressures that a patient can generate at either ... Respiratory muscle assessment. Eur Respir Mono 2005, 31, 51 - 57. T. Troosters, R Gosselink, M Decramer Page 352 in: Irwin, ...
... and respiratory tract irritation. Over time, breathing the dust from drywall joint compounds may cause persistent throat and ... A drywall mechanic is a skilled trade similar to wood carpenters, except they build everything out of heavy gauge and light ... A drywall mechanic can work for a construction firm, or work privately. Health hazards include the dangers of toxic poisoning ... A Drywall mechanic erect various exterior and interior stud wall partitions. They also install metal door frames, window frames ...
... positive-pressure ventilation directly alters lung mechanics during ARDS. When these techniques are used the result is higher ... This leads to the impaired oxygenation, which is the central problem of ARDS, as well as to respiratory acidosis. Respiratory ... The pathophysiology of acute respiratory distress syndrome involves fluid accumulation in the lungs not explained by heart ... Elevated inspired oxygen concentration often becomes necessary at this stage, and may facilitate a 'respiratory burst' in ...
He was an early explorer of the concept of respiratory muscle fatigue and shone a light on its role in respiratory disease. In ... This formed the basis for his lifelong interest in the mechanics of breathing. In 1963, he became a fellow of the Royal College ... Peter T. Macklem, 1931-2011: a tribute from the European Respiratory Society". European Respiratory Journal. 37 (4): 735-37. ... In 1967, Maklem became director of the Respiratory division at the RVH. In 1972, he became a professor of Medicine at McGill ...
It has been thought that the tripod position optimizes the mechanics of respiration by taking advantage of the accessory ... The tripod position is a physical stance often assumed by people experiencing respiratory distress (such as chronic obstructive ... Perrin Respiratory Physiology: a Clinical Approach, by Richard M. Schwartzstein and Michael J. Parker; Lippincott Williams & ... a patient adopting the tripod position is considered an indication that the patient may be in respiratory distress. In the ...
This rate was between 2.5 and 3.2 times the normal incidence of lung or respiratory cancers. Many stories have originated from ... "Popular Mechanics". January 1984. p. 163 Von Humboldt, Alexander (1799). Ueber die unterirdischen Gasarten und die Mittel, ... These masks were distributed during World War II Mother and baby with gas masks, 1941 According to Popular Mechanics, "The ... "OSHA Bulletin: General Respiratory Protection Guidance for Employers and Workers". Occupational Safety and Health ...
Advocates for this technique claim that it can improve breathing mechanics, including diaphragmatic function. They use the term ... Its advocates claim that it improves postural adaptations, the function of the respiratory system and asymmetrical patterns. ... The diaphragm's mechanical action and respiratory advantage depends on its relationship and anatomical arrangement with the rib ... The American Review of Respiratory Disease. 11 (31). Medicine portal. ...
Clifford B. Hicks, 90, American writer and editor (Popular Mechanics, Alvin Fernald series). Voki Kostić, 79, Serbian composer ... Gloria Stuart, 100, American film actress (The Invisible Man, Titanic), respiratory failure. Carmelo Arden Quin, 97, Uruguayan ... respiratory failure. Joe Mantell, 94, American character actor (Marty, Chinatown, The Twilight Zone), pneumonia. David Marques ...
... but also the development of mechanics and later bio-mechanics. Galileo Galilei, the father of mechanics and part time ... Recently, respiratory systems in insects have been studied for bioinspiration for designing improved microfluidic devices. ... Biological fluid mechanics, or biofluid mechanics, is the study of both gas and liquid fluid flows in or around biological ... He contributed to mechanics and military and civil engineering projects. He had a great understanding of science and mechanics ...
Eric Davidson, 94, Canadian blind mechanic, survivor of the Halifax Explosion. Anthony G. Evans, 66, British scientist. Léon ... Rogelio Borja Flores, 74, Filipino sports writer, respiratory failure. Annie Le, 24, American graduate student, homicide. Kyle ... Shah Abdul Karim, 93, Bangladeshi musician, respiratory problems. Jack Kramer, 88, American tennis player, cancer. Brian Mier, ...
Biomechanics is the study of the structure and function of biological systems by means of the methods of Mechanics. ... respiratory therapists, speech therapists, occupational therapists, radiographers, dietitians, and bioengineers, surgeons, ...
Quantum mechanics * sw:Quantum mechanics. R-S[hariri chanzo]. Rabindranath Tagore * sw:Rabindranath Tagore. Racism * sw:Racism ... Respiratory system * sw:Respiratory system. Rhine * sw:Rhine. Rice * sw:Rice. Richard Wagner * sw:Richard Wagner. Rio de ... Classical mechanics * sw:Classical mechanics. Classical music * sw:Classical music. Climate * sw:Climate. Clock * sw:Clock. ...
... respiratory and critical care. With true respiratory gas exchange, PediaSIM HPS inhales oxygen and exhales CO2, interfaces with ... mechanics, etc. ... respiratory therapists, physical therapists, and more. Medical ...
to detect respiratory disease in patients presenting with symptoms of breathlessness, and to distinguish respiratory from ... Static lung compliance is perhaps the most sensitive parameter for the detection of abnormal pulmonary mechanics.[21] It is ... In those with acute respiratory failure on mechanical ventilation, "the static compliance of the total respiratory system is ... May 1985). "Measurement of static compliance of the total respiratory system in patients with acute respiratory failure during ...
... s possess a highly adapted respiratory system to cope with the demands of powered flight, an energetically taxing activity ... "The nature of flight: The molecules and mechanics of flight in animals". Science and Society. 8 (9): 811-813. doi:10.1038/sj. ... During flight the respiratory cycle has a one-to-one relationship with the wing-beat cycle.[66] Because of the restraints of ... Bats are implicated in the emergence of severe acute respiratory syndrome (SARS) in China, since they serve as natural hosts ...
The concept of dynamical systems theory has its origins in Newtonian mechanics. There, as in other natural sciences and ... respiratory, circulatory, nervous, skeletomuscular, perceptual) that are composed of a large number of interacting components ( ... From a physical point of view, continuous dynamical systems is a generalization of classical mechanics, a generalization where ...
The feeder's design enables the feeder to be activated by tongue and gum pressure, imitating the mechanics involved in ... Infant respiratory distress syndrome. *Infant sleep training. *Neo-natal intensive care unit ... so that she might better comprehend the mechanics of feeding. She especially noted the differences between bottle feeding ( ...
"Popular Mechanics. Retrieved April 24, 2020.. *↑ Mark Johnson (April 2, 2020). "Tests of potential coronavirus vaccine spur ... In late February 2020, the World Health Organization (WHO) said it did not expect a vaccine against Severe Acute Respiratory ...
An orbital is a concept from quantum mechanics that models an electron as a wave-like particle that has a spatial distribution ... The free oxygen partial pressure in the body of a living vertebrate organism is highest in the respiratory system, and ... 2008). "Performance of oxygen delivery devices when the breathing pattern of respiratory failure is simulated". Anaesthesia. 63 ... known experiments on the relationship between combustion and air was conducted by the 2nd century BCE Greek writer on mechanics ...
Respiratory system. Sea cucumbers extract oxygen from water in a pair of "respiratory trees" that branch in the cloaca just ... MCTs can be used in many ways but are all similar at the cellular level and in mechanics of function. A common trend in the ... Additional vessels surround the respiratory trees, although they contact them only indirectly, via the coelomic fluid.[10] ... Together with the intestine, the respiratory trees also act as excretory organs, with nitrogenous waste diffusing across the ...
2011). "Chapter 3: Respiratory system". Equine clinical medicine, surgery, and reproduction. London: Manson Publishing/The ... ipratroprium bromide and frusemide on breathing mechanics and gas exchange in healthy exercising horses". Equine Veterinary ... Ramzan, Peter H.L. (2014). "Respiratory conditions: lower airway disease". The racehorse: a veterinary manual. pp. 222-234. ... Barakzai, Safia (2006). "Chapter 7: Trachea and bronchi". Handbook of equine respiratory endoscopy. Edinburgh: Elsevier ...
An article that appeared in the November 1997 issue of Discover Magazine reported research into the mechanics of diplodocid ... Pierson, D. J. (2009). "The Physiology of Dinosaurs: Circulatory and Respiratory Function in the Largest Animals Ever to Walk ... They assumed that the animals had a reptilian respiratory system. Wedel found that an avian system would have allowed them to ... the Earth". Respiratory Care. 54 (7): 887-911. doi:10.4187/002013209793800286. PMID 19558740.. ...
Stress (mechanics). ಭೌತಶಾಸ್ತ್ರ (Physics). ವಿಭೇದನ. Deformation (mechanics). ಭೌತಶಾಸ್ತ್ರ (Physics). ಜ್ಯಾಮಿತೀಯ ದ್ಯುತಿಶಾಸ್ರ್ತ. ... Respiratory system. ಜೀವಶಾಸ್ತ್ರ (Biology). kn:ಜಲಾವರಣ. Hydrosphere. ಜೀವಶಾಸ್ತ್ರ (Biology). kn:ವಾತಾವರಣ. Atmosphere. ...
"Quantum Biology: Better living through quantum mechanics". The Nature of Reality. Nova: PBS Online; WGBH Boston. Archived from ...
Motta, Philip Jay (1984-02-23). "Mechanics and Functions of Jaw Protrusion in Teleost Fishes: A Review". Copeia. 1984 (1): 1-18 ... as a modification of the fifth gill arch which no longer has a respiratory function. The first four arches still function as ... Westneat, Mark W. (September 1990). "Feeding mechanics of teleost fishes (Labridae; Perciformes): A test of four-bar linkage ... "Feeding mechanics and bite force modelling of the skull of Dunkleosteus terrelli, an ancient apex predator". Biology Letters ...
Annual Review of Fluid Mechanics. Annual Reviews. 37: 183. Bibcode:2005AnRFM..37..183W. doi:10.1146/annurev.fluid.36.050802. ... According to this theory these tracheal gills, which started their way as exits of the respiratory system and over time were ... Among these include: gills, respiratory appendages of legs, and lateral (paranotal) and posterolateral projections of the ...
Fredlund, D.G.; Rahardjo, H. (1993). Soil Mechanics for Unsaturated Soils (PDF). Wiley-Interscience. ISBN 978-0-471-85008-3. ... reducing loss of water through its skin and respiratory system when at rest.[80][82] Herbivorous mammals obtain moisture from ... "Physics, Mechanics and Processes of Dust and Sandstorms" (PDF). Global Alarm: Dust and Sandstorms from the World's Drylands ...
"Science and Mechanics. Archived from the original on 22 July 2010. Retrieved 17 April 2010.. ... "How do Respiratory State and Measurement Method affect Bra Size Calculations?". British Journal of Sports Medicine. 40 (12): ...
Respiratory systemEdit. The tube-like heart (green) of the mosquito Anopheles gambiae extends horizontally across the body, ... Annual Review of Fluid Mechanics. 38: 339-369. Bibcode:2006AnRFM..38..339B. doi:10.1146/annurev.fluid.38.050304.092157. ... The respiratory system of insects constrains their size, however the high oxygen in the atmosphere allowed larger sizes.[100] ... The respiratory system is an important factor that limits the size of insects. As insects get larger, this type of oxygen ...
Caro CG (1978). The Mechanics of The Circulation. Oxford [Oxfordshire]: Oxford University Press. ISBN 978-0-19-263323-1. .. ... Blood pressure is one of the vital signs, along with respiratory rate, heart rate, oxygen saturation, and body temperature. ... Other compensatory mechanisms include the veno-arteriolar axon reflex, the 'skeletal muscle pump' and 'respiratory pump'. ...
The North Carolina General Assembly founded the North Carolina College of Agriculture and Mechanic Arts, now NC State, on March ... respiratory tract, skin, and digestive system are undertaken. The Center for Comparative Medicine and Translational Research, ... "North Carolina College of Agriculture and Mechanic Arts." In the segregated system, it was open only to white students. As a ...
"Lung parenchymal mechanics". Comprehensive Physiology. 1 (3): 1317-1351. doi:10.1002/cphy.c100033. ISBN 9780470650714. . PMC ... lung outside of the circulatory system that is involved with gas exchange and includes the pulmonary alveoli and respiratory ...
He was followed by piercing thought amalgamated with the era's mysticism and religion sometimes fueled by the mechanics of ...
"Changes in the structure-function relationship of elastin and its impact on the proximal pulmonary arterial mechanics of ...
"American Journal of Respiratory and Critical Care Medicine. 195 (8): 1058-1065. doi:10.1164/rccm.201605-0968OC. hdl:10044/1/ ... Mechanics of sex. Development of the. reproductive system. *Sexual differentiation *Sexual dimorphism ... The European Respiratory Journal. 48 (5): 1288-1297. doi:10.1183/13993003.00412-2016. PMID 27660514. S2CID 206961124.. ...
"Popular Mechanics. 64 (4): 513. April 1936. ISSN 0032-4558.. *^ "How Your Diet May Affect Your Risk of Breast Cancer". American ... "upper respiratory tract" (ID 3589) pursuant to Article 13(1) of Regulation (EC) No 1924/2006". EFSA Journal. 9 (7): 2264. doi: ...
玉米黑穗菌是一種植物病原菌,在玉米造成黑穗菌病,不過植物已演化出對抗真菌感染的機制。當感染發生時,植物會迅速產生呼吸爆(英语:Respiratory burst),即在真菌感染的部
Riker JB, Haberman B (1976). "Expired gas monitoring by mass spectrometry in a respiratory intensive care unit". Critical Care ... Mass spectrometers were used in hospitals for respiratory gas analysis beginning around 1975 through the end of the century. ... Gothard JW, Busst CM, Branthwaite MA, Davies NJ, Denison DM (September 1980). "Applications of respiratory mass spectrometry to ...
Holbourn, A. H. S. (9 October 1943). "Mechanics of Head Injuries". The Lancet. 242 (6267): 438-41. doi:10.1016/S0140-6736(00) ... The sinuses are lined with respiratory epithelium. Their known functions are the lessening of the weight of the skull, the ...
This module considers the respiratory system. In these lessons, we explore topics such as how we get air into our lungs, ... ... Respiratory System. We hope that you are enjoying the course! This module considers the respiratory system. In these lessons, ... Then the largest volume is going to be in the respiratory portion of the respiratory tract, which is going to be about three ... Anatomy and Mechanics. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 ...
Dynamic respiratory mechanics and exertional dyspnoea in pulmonary arterial hypertension Pierantonio Laveneziana, Gilles Garcia ... European Respiratory Society. 442 Glossop Road. Sheffield S10 2PX. United Kingdom. Tel: +44 114 2672860. Email: [email protected] ... European Respiratory Journal Mar 2013, 41 (3) 578-587; DOI: 10.1183/09031936.00223611 ...
Estimation of Respiratory Mechanics (Respiratory System, Chest Wall and Lung Elastance) and Pleural Effusion at the Bedside ... In ALI/ARDS we evaluated the respiratory mechanics (respiratory system, chest wall and lung elastance) at the bedside while ... The investigators aim to compare the respiratory mechanics in acute lung injury (ALI)/acute respiratory diseases syndrome (ARDS ... Respiratory Mechanics and Pleural Effusion. The safety and scientific validity of this study is the responsibility of the study ...
The clinical significance of this effect is small, although as respiratory rate increases, the effects are magnified. In ... Changes in respiratory mechanics after tracheostomy Arch Surg. 1999 Jan;134(1):59-62. doi: 10.1001/archsurg.134.1.59. ... Interventions: Respiratory mechanics, lung volumes, and WOB were measured before and after tracheostomy. ... The study hypothesis was that tracheostomy would result in improved pulmonary function through changes in respiratory mechanics ...
... may in turn alter respiratory mechanics. Surgical correction of these cardiac defects frequently in … ... further compromising lung mechanics. The aims of this study were to document the effect of PBF on respiratory mechanics in ... Changes in respiratory mechanics in children undergoing cardiopulmonary bypass Am J Respir Crit Care Med. 1995 Dec;152(6 Pt 1): ... There was no correlation between MPAP and respiratory mechanics. After CPB, ERS, dyn and RRS fell to normal levels in group 1.( ...
Respiratory mechanics during high-frequency oscillatory ventilation: a physical model and preterm infant study.. Singh R1, ... their oscillatory respiratory mechanics were evaluated. Infant resistance at the proximal ETT (R(ETT); resistance airway ... Accurate mechanics measurements during high-frequency oscillatory ventilation (HFOV) facilitate optimizing ventilator support ... mPtr (pred)], and 2) reproducible respiratory system resistance (Rrs) and compliance (Crs) may be derived from no-leak ...
Heliox breathing equally influences respiratory mechanics and cycling performance in trained males and females.. Wilkie SS1, ... Heliox breathing equally influences respiratory mechanics and cycling performance in trained males and females ... Heliox breathing equally influences respiratory mechanics and cycling performance in trained males and females ... Heliox breathing equally influences respiratory mechanics and cycling performance in trained males and females ...
Inspiratory muscle strength and the flow and elastic pressure opposing inspiration were measured in seven patients with severe airways obstruction who found inspiration difficult at rest. A comparison was made of measurements obtained from seven normal subjects and five patients with airways obstruction not experiencing inspiratory dyspnoea at rest. Measurements were also obtained when inspiratory dyspnoea was induced in the normal subjects by adding an inspiratory resistance or by voluntarily increasing lung volume. Compared with the controls the inspiratory muscle strength of the patients was reduced but was not significantly less than that of the patients without inspiratory dyspnoea. The pressure required to produce inspiratory flow was significantly greater when inspiratory dyspnoea was present (P = 0-01). However, there was considerable overlap in the pressures of those with and without inspiratory dyspnoea. A better relationship was obtained when muscle strength was considered. The ratio ...
EFFECTS OF CONTINUOUS NEGATIVE PRESSURE ON LUNG MECHANICS IN IDIOPATHIC RESPIRATORY DISTRESS SYNDROME. Eduardo Bancalari, Otto ... EFFECTS OF CONTINUOUS NEGATIVE PRESSURE ON LUNG MECHANICS IN IDIOPATHIC RESPIRATORY DISTRESS SYNDROME ... EFFECTS OF CONTINUOUS NEGATIVE PRESSURE ON LUNG MECHANICS IN IDIOPATHIC RESPIRATORY DISTRESS SYNDROME ... EFFECTS OF CONTINUOUS NEGATIVE PRESSURE ON LUNG MECHANICS IN IDIOPATHIC RESPIRATORY DISTRESS SYNDROME ...
... ... T. Similowski and J. H. T. Bates, "Two-compartment modelling of respiratory system mechanics at low frequencies: gas ... M. McGregor and M. R. Becklake, "The relationship of oxygen cost of breathing to respiratory mechanical work and respiratory ... A. B. Otis, W. O. Fenn, and H. Rahn, "Mechanics of breathing in man," Journal of applied physiology, vol. 2, no. 11, pp. 592- ...
The respiratory mechanics of the yacare caiman (Caiman yacare Daudine). Michelle N. Reichert, Paulo R. C. de Oliveira, George M ... The respiratory mechanics of the yacare caiman (Caiman yacare Daudine). Michelle N. Reichert, Paulo R. C. de Oliveira, George M ... The respiratory mechanics of the yacare caiman (Caiman yacare Daudine). Michelle N. Reichert, Paulo R. C. de Oliveira, George M ... The respiratory mechanics of the yacare caiman (Caiman yacare Daudine) Message Subject (Your Name) has sent you a message from ...
Dynamic respiratory mechanics and exertional dyspnoea in pulmonary arterial hypertension Message Subject (Your Name) has sent ... Dynamic respiratory mechanics and exertional dyspnoea in pulmonary arterial hypertension. Pierantonio Laveneziana, Gilles ... Dynamic respiratory mechanics and exertional dyspnoea in pulmonary arterial hypertension. Pierantonio Laveneziana, Gilles ... Dynamic respiratory mechanics and exertional dyspnoea in pulmonary arterial hypertension. Pierantonio Laveneziana, Gilles ...
Respiratory mechanics after 180 days space mission (EUROMIR95). Venturoli, Daniele LU ; Semino, P ; Negrini, D and Miserocchi ... Post-flight pressure-volume curves of the lung, chest wall and total respiratory system are equal to preflight ones. The ... Post-flight pressure-volume curves of the lung, chest wall and total respiratory system are equal to preflight ones. The ... The present study reports data on respiratory function of lung and chest wall following the 180 days long European - Russian ...
Respiratory mechanics measurements made at equal tidal volumes [Vt; as % vital capacity (VC)] and frequencies (fR) ... Respiratory system morphology and static mechanics. The species compared had a wide range of body masses (from roughly 0.3 to 1 ... 1) (Gonzalez et al., 2009). The non-conforming pattern in respiratory mechanics seen in the ruddy ducks is likely due to a ... To investigate this, we compared the mechanics of the respiratory system and the work of breathing in 11 species of waterfowl ...
Címlap » Kutatás » Publikációk » Assessment of respiratory mechanics with forced oscillations in healthy newborns ...
Laparoscopic Cholecystectomy Respiratory System Lung Volume Functional Residual Capacity Respiratory Mechanic This is a preview ... Basics of Respiratory Mechanics and Artificial Ventilation pp 21-35 , Cite as ... Pelosi P, Croci M, Ravagnan I, Cerisara M, Vicardi P, Lissoni A, Gattinoni L (1997) Respiratory system mechanics in sedated, ... Pelosi P, Croci M, Ravagnan I, Vicardi P, Gattinoni L (1996) Total respiratory system, lung, and chest wall mechanics in ...
This study was designed to determine the impact of the degree of obesity on respiratory mechanics and simple hemodynamic ... BACKGROUND: This study was designed to determine the impact of the degree of obesity on respiratory mechanics and simple ... The Impacts of Super Obesity Versus Morbid Obesity on Respiratory Mechanics and Simple Hemodynamic Parameters During Bariatric ... CONCLUSIONS: Morbid obesity and super obesity have negative effects on hemodynamics and respiratory mechanics.. ...
Pulmonary Mechanics and Mortality in Mechanically Ventilated Patients Without Acute Respiratory Distress Syndrome: A Cohort ... Driving pressure has been proposed as a major determinant of outcome in patients with acute respiratory distress syndrome (ARDS ... Multivariable models were constructed to: define the association between pulmonary mechanics (driving pressure, plateau ... but there is little data examining the association between pulmonary mechanics, including driving pressure, and outcomes in ...
Evaluation of the multiple linear regression method to monitor respiratory mechanics in ventilated neonates and young children ... on lung function and mechanics in preterm infants with respiratory distress syndrome (RDS) at the same level of retropharyngeal ... Figure 4 shows WOBi, divided into WOBup and the component due to the lower part of the respiratory system. At a Prp of 4 cm H2O ... Respiratory induction plethysmography (Respitrace): an evaluation of its use in the infant. Am Rev Resp Dis 1981;123:542-6. ...
... on lung function and mechanics in preterm infants with respiratory distress syndrome (RDS) at the same level of retropharyngeal ... Patients 20 preterm infants (gestational age: 31±1 wks) with mild-moderate RDS requiring non-invasive respiratory support ... Main outcome measures Tidal volume by respiratory inductance plethysmography, pleural pressure estimated by oesophageal ... lung mechanics and total WOB. Resistive WOB in the upper airways was slightly but significantly higher during HHHFNC (0.65 ( ...
... respiratory mechanics, and gas exchange. Sixteen critically ill patients post-septic shock, with acute lung injury, were ... Effect of Manual Hyperinflation on Hemodynamics, Gas Exchange, and Respiratory Mechanics in Ventilated Patients ... respiratory mechanics, and gas exchange. Sixteen critically ill patients post-septic shock, with acute lung injury, were ... In critically ill patients, MHI resulted in an improvement in lung mechanics and an improvement in gas exchange in patients ...
Deterioration of Nighttime Respiratory Mechanics in Chronic Obstructive Pulmonary Disease: Impact of Bronchodilator Therapy.. ... dynamic respiratory mechanics and IND (secondary outcomes).20 participants with COPD (moderate/severe airway obstruction and ... with no change in ventilation or breathing pattern.Respiratory mechanics significantly deteriorated at night during PL. While ... long-acting bronchodilators on detailed nocturnal respiratory mechanics and inspiratory neural drive (IND).A double-blind, ...
Respiratory Physiology & Neurobiology" on DeepDyve, the largest online rental service for scholarly research with thousands of ... "Mechanical insufflation/exsufflation improves respiratory mechanics in critical care: Randomized crossover trial, ... "Mechanical insufflation/exsufflation improves respiratory mechanics in critical care: Randomized crossover trial." Respiratory ... Mechanical insufflation/exsufflation improves respiratory mechanics in critical care: Randomized crossover trial. Respiratory ...
Name: Dustin Geiss Exercise 7: Respiratory System Mechanics: Activity 2: Comparative Spirometry Lab Report Pre-lab Quiz ... Name: Dustin Geiss Exercise 7: Respiratory System Mechanics: Activity 2: Comparative Spirometry Lab Report Pre-lab Quiz Results ... PEX-07-02_ - Name Dustin Geiss Exercise 7 Respiratory System Mechanics Activity 2 Comparative Spirometry Lab Report Pre-lab ... Which respiratory process is impaired the most by emphysema? 3. During an asthma attack 4. During moderate aerobic exercise, ...
Effects of inhaled fenoterol and positive end-expiratory pressure on the respiratory mechanics of patients with chronic ... Effects of inhaled fenoterol and positive end-expiratory pressure on the respiratory mechanics of patients with chronic ... Effects of inhaled fenoterol and positive end-expiratory pressure on the respiratory mechanics of patients with chronic ...
Comparison of different flow-reducing bag-valve ventilation devices regarding respiratory mechanics and gastric inflation in an ... Download PDF Comparison of different flow-reducing bag-valve ventilation devices regarding respiratory mechanics and gastric ... Comparison of different flow-reducing bag-valve ventilation devices regarding respiratory mechanics and gastric inflation in an ... DESIGN: Experimental analysis on the respiratory effects of hose extended bag-valve ventilation devices designed to reduce ...
Respiratory mechanics at different PEEP level during general anesthesia in the elderly: a pilot study. Marangoni E. 1, Alvisi V ... Data of respiratory mechanics were calculated at the beginning and at the end of anesthesia.. RESULTS: 1) The PEEP test allows ... The group ZEEP exhibited a marked decrease of expiratory flow and a worsening of respiratory mechanics at the end of surgery. ... The use of 5 cmH2O of PEEP was helpful to prevent the deterioration of lung mechanics that occurs during surgery. ...
Hall GL, Hantos Z, Petak F, Wildhaber JH, Tiller K, Burton PR, Sly PD: Airway and respiratory tissue mechanics in normal ... Correa FC, Ciminelli PB, Falcao H, Alcantara BJ, Contador RS, Medeiros AS, Zin WA, Rocco PR: Respiratory mechanics and lung ... Habre W, Scalfaro P, Sims C, Tiller K, Sly PD: Respiratory mechanics during sevoflurane anesthesia in children with and without ... Habre W, Wildhaber JH, Sly PD: Prevention of methacholine-induced changes in respiratory mechanics in piglets: A comparison of ...
Basics of Respiratory Mechanics and Artificial Ventilation. Overview of attention for book ... Chapter 8 Mechanical models of the respiratory system: non-linear and inhomogeneous models ...
ホーム , ジャーナル , International Journal of Fluid Mechanics Research , 巻 28, 2001 発行 6 , Human Respiratory Sounds: Objectivization ... Human Respiratory Sounds: Objectivization of the Auscultatory Signs. I. V. Vovk Institute of Hydromechanics of National Academy ... Bibliographic data about plausible reasons causing the basic and the complementary respiratory sounds are systematized. On ...
  • Rehder K, Marsh MH (1986) Respiratory mechanics during anaesthesia and mechanical ventilation. (springer.com)
  • The authors investigated the effect of manual hyperinflation (MHI) with set parameters applied to patients on mechanical ventilation on hemodynamics, respiratory mechanics, and gas exchange. (ovid.com)
  • 1. First, mechanical ventilation with a gas mixture composed of helium and oxygen is only beneficial in patients with obstructive Respiratory Syncytial Virus Lower Respiratory Tract Disease (RSV LRTD). (isrctn.com)
  • Mechanical ventilation asynchrony was influenced by effort, respiratory mechanics, ventilator type, and ventilation mode. (rcjournal.com)
  • Analysis of respiratory mechanics during mechanical ventilation (MV) is able to estimate resistive, elastic and inertial components of the working pressure of the respiratory system. (biomedcentral.com)
  • Mechanical ventilation, either invasive or noninvasive, is crucial to treat patients with acute or chronic respiratory failure in intensive care units and hospital wards. (ersjournals.com)
  • Accordingly, it is important that medical students achieve a good background understanding of respiratory mechanics in undergraduate courses of physiology, and that this training is refreshed later when the student is introduced to mechanical ventilation learning and further when starting clinical training in this therapy [ 1 ]. (ersjournals.com)
  • Given the lack of simple, adaptable, and freely available tools for training in the basic concepts of respiratory mechanics and mechanical ventilation, based on the widely used Microsoft Excel spreadsheet platform, we designed a practical tool for medical students covering the basic concepts of respiratory mechanics and their application to mechanical ventilation. (ersjournals.com)
  • The objectives were to study the changes in the mechanics of respiration in children undergoing surgery depending on the value of intra-abdominal pressure (IAP) during laparoscopic procedures, and to compare the effects of different mechanical ventilation modes - pressure controlled (PCV) and volume controlled (VCV) ventilation - on the mechanics of respiration considering carboxyperitoneum conditions (CP). (termedia.pl)
  • Our work is mainly focused on mechanics of the upper airway in sleep apnea syndrome, and on mechanical ventilation in acute and chronic respiratory failure. (ub.edu)
  • Objective To establish a model of respiratory mechanics with consideration of gas exchange and directly correlate with the gas content in blood during mechanical ventilation with the mechanics of respiratory system . (bvsalud.org)
  • Conclusions The model of respiratory mechanics developed in the study is a preliminary attempt to predict the regulation roles of physiological parameters clinically monitored during mechanical ventilation , which will provide a theoretical support for the design and development of novel respirators in the follow-up experiment. (bvsalud.org)
  • Objective To investigate the respiratory mechanics and treatment outcomes of different types of mechanical ventilation for patients with neonatal acute respiratory distress syndrome (ARDS)the high frequency oscillation ventilation + pulmonary surfactant (HFOV+PS),conventional mechanical ventilation + pulmonary surfactant (CMV+PS),conventional mechanical ventilation (CMV). (bvsalud.org)
  • The respiratory actions of muscles and their integration in the process of respiration are examined. (elsevier.com)
  • respiratory system physiology mechanics of respiration inspiring Randall Melrose, his certificates with strength. (90blog.tk)
  • facial and identified Dimitris overcame their import concerns banish respiratory system physiology mechanics of respiration separately. (90blog.tk)
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  • Respiration rate, heart rate, rectal temperature, and respiratory dead space are increased at the higher temperature. (cdc.gov)
  • To study the changes in the mechanics of respiration in operated children depending on the value of intra-abdominal pressure during laparoscopic procedures. (termedia.pl)
  • Elevation of intra-abdominal pressure due to carboxyperitoneum conditions had a negative effect on the mechanics of respiration. (termedia.pl)
  • This facilitated the reliable and accurate assessment of physiologic respiratory mechanical properties that can objectively guide ventilatory management of HFOV-treated preterm infants. (nih.gov)
  • D. F. Proctor, "Studies of respiratory air flow in measurement of ventilatory function. (hindawi.com)
  • Mankikian B, Cantineau JP, Sartene R, Clergue F, Viars P (1986) Ventilatory pattern and chest wall mechanics during ketamine anaesthesia in humans. (springer.com)
  • 8 , 9 In its more recent version, it is known as PAV plus (PAV+), which automatically estimates the mechanics of the respiratory system and auto-adjusts ventilatory support. (rcjournal.com)
  • The analyzers are intended to provide a baseline ventilatory function as well as identify respiratory impairments. (optometricmanagement.com)
  • A better understanding of lung mechanics in this group of patients may lead to change the traditional ventilatory approach to severe bronchiolitis. (biomedcentral.com)
  • Overweight contributes to the development of significant cardiorespiratory impairments, including the increase in airway and respiratory system resistance, limited ventilatory capacity, and changes in the cardiovascular autonomic function. (elsevier.pt)
  • The respiratory system (also respiratory apparatus , ventilatory system ) is a biological system consisting of specific organs and structures used for gas exchange in animals and plants . (wikipedia.org)
  • We evaluated quality selection and compared mean values and their variability according to ventilatory mode and respiratory mechanic provenance. (uliege.be)
  • Like in adult ARDS patients, an estimate of how much respiratory system is impaired should be fundamental for optimizing the ventilatory strategy (i.e., to minimize the ventilation induced lung injury). (springeropen.com)
  • In Sprague-Dawley rats (n = 6, 270-375 g) the main bronchi were independently cannulated, and respiratory mechanics determined while animals underwent different ventilatory patterns: synchronic ventilation without increased IAP (SV-0), elevated IAP during SV (SV-10), and AV with elevated IAP (AV-10). (ibecbarcelona.eu)
  • Respiratory mechanics during high-frequency oscillatory ventilation: a physical model and preterm infant study. (nih.gov)
  • Accurate mechanics measurements during high-frequency oscillatory ventilation (HFOV) facilitate optimizing ventilator support settings. (nih.gov)
  • Proportional assist ventilation: results of an initial clinical trial," American Review of Respiratory Disease , vol. 145, no. 1, pp. 121-129, 1992. (hindawi.com)
  • 0.05) with no change in ventilation or breathing pattern.Respiratory mechanics significantly deteriorated at night during PL. While morning trough IC was unchanged, evening bronchodilator treatment was consistently associated with sustained overnight improvements in dynamic respiratory mechanics and inspiratory neural drive compared with placebo. (onmedica.com)
  • DESIGN: Experimental analysis on the respiratory effects of hose extended bag-valve ventilation devices designed to reduce inspiratory pressure and flow. (uzh.ch)
  • Combined experimental and modeling approaches address the mechanics of the chest wall including the interaction of thorax and abdomen, the mechanics of the diaphragm, the mechanical properties of the lung parenchyma, and the determinants of regional ventilation. (elsevier.com)
  • For ventilation to occur, the respiratory system must. (brainscape.com)
  • Deep neuromuscular blockade did not change respiratory mechanics, regional aeration and ventilation, and hemodynamics. (anesthesiaexperts.com)
  • Focusing on lung-protective ventilation, the analysis of nonlinear dynamic respiratory mechanics appears crucial. (beds.ac.uk)
  • Effects of helium-oxygen on respiratory mechanics, gas exchange, and ventilation-perfusion relationships in a porcine model of stable methacholine-induced bronchospasm. (unil.ch)
  • Shunt fraction, high V/Q and respiratory mechanics were measured at positive end-expiratory pressure 0 cm H 2 O during bilateral lung ventilation and one-lung ventilation and, subsequently, during one-lung ventilation at 5 or 10 cm H 2 O of positive end-expiratory pressure. (anesthesiaexperts.com)
  • Methods: Under optimal induction and muscle relaxation the SAD's were inserted into the patients oral cavity and position was checked with ideal ventilation and chest rise.base line, post induction, after insertion of SAD's, after pneuoperitonium and post operative care respiratory and haemodynamic parameters were recorded and compared. (journalcra.com)
  • We hypothesized that 1) the effective removal of ETT leaks may be confirmed via direct comparison of measured vs. model-predicted mean intratracheal pressure [mPtr (meas) vs. mPtr (pred)], and 2) reproducible respiratory system resistance (Rrs) and compliance (Crs) may be derived from no-leak oscillatory Ptr and proximal flow. (nih.gov)
  • Dynamic respiratory compliance, respiratory resistance, and peak inspiratory pressures were measured at four time points: 10 min after anesthesia induction (T1: induction), 10 min after pneumoperitoneum (T2: pneumoperitoneum), 10 min after terminating pneumoperitoneum (T3: end-pneumoperitoneum), and before extubation (T4: extubation). (biomedsearch.com)
  • RESULTS: Obesity was found to cause a statistically significant increase in respiratory resistance and a peak inspiratory pressure and a decrease in dynamic respiratory compliance. (biomedsearch.com)
  • In the morbidly obese group, the lowest dynamic respiratory compliance was 37 ± 12 mL/cm H(2)O, but it was 33 ± 13 mL/cm H(2)O in the super obese group. (biomedsearch.com)
  • Respiratory system mechanics (compliance and resistance). (isrctn.com)
  • The difference between P plat and PEEP is determined by tidal volume and respiratory system compliance. (rcjournal.com)
  • Respiratory function mechanics analyzers designed to assess the volume, airflow (i.e., diffusion and distribution of tracking gases), and derived parameters (e.g., airway compliance and resistance) through the respiratory tract of adults and older children (typically older than 12 years of age). (optometricmanagement.com)
  • Using the leak-compensated lung flow and a predetermined respiratory mechanics model, the respiratory mechanics of a patient may be estimated including at least one of a leak-compensated lung compliance and a leak-compensated lung resistance. (patentsencyclopedia.com)
  • Cpulm is pulmonary compliance, Ccw is chest wall compliance, Crs is respiratory system compliance. (pulmccm.org)
  • The slope of the respiratory system curve represents the compliance of the lungs and chest wall in series. (pulmccm.org)
  • Thus, if the chest wall were to stiffen [e.g. obesity, ascites, intra-abdominal hypertension], its curve shifts down and rightwards and so too does the compliance curve of the respiratory system [ 4 , 5 ]. (pulmccm.org)
  • Similarly, if the lungs lose compliance [e.g. massive aspiration, alveolar edema, fibrotic lung disease], its curve shifts down and rightwards and so too does the compliance curve of the entire respiratory system [ 5 , 6 ] - see figure 2 A and B, respectively. (pulmccm.org)
  • The compliance curve of the respiratory system provides the static airway pressure of the respiratory system. (pulmccm.org)
  • Accordingly, a high Pplat [low respiratory system compliance] may be of two very distinct etiologies [ 5 ]. (pulmccm.org)
  • Second, in 10 mice, we measured dynamic respiratory compliance, forced expiratory volume in 0.1 s, and maximal expiratory flow before and after methacholine challenge. (elsevier.com)
  • Maximal flow-static pressure curves were relatively linear up to pressure equal to 9 cmH 2 O. In addition, methacholine challenge caused significant decreases in respiratory compliance, forced expiratory volume in 0.1 s, and maximal expiratory flow, indicating marked airway constriction. (elsevier.com)
  • In addition, methacholine challenge caused significant decreases in respiratory compliance, forced expiratory volume in 0.1 s, and maximal expiratory flow, indicating marked airway constriction. (elsevier.com)
  • In sedated and paralyzed children with acute respiratory failure, the compliance of respiratory system and functional residual capacity were significantly reduced compared with healthy subjects. (springeropen.com)
  • The ARDS patients had a significantly lower respiratory system and lung compliance as compared to control subjects (9.9 ± 5.0 vs 17.8 ± 6.5, 9.3 ± 4.9 vs 16.9 ± 4.1 at 4 cmH 2 O of PEEP and 11.7 ± 5.8 vs 23.7 ± 6.8, 10.0 ± 4.9 vs 23.4 ± 7.5 at 12 cmH 2 O of PEEP). (springeropen.com)
  • The application of PEEP was able to increase the compliance of respiratory system and to normalize the functional residual capacity in the majority of the patients [ 17 , 18 ]. (springeropen.com)
  • This is usually seen in patients with an increased work of breathing due to airflow obstruction or decreased respiratory system compliance, with decreased respiratory muscle power due to neuromuscular disease, or with central respiratory failure and decreased respiratory drive. (mcgill.ca)
  • We measured static respiratory system compliance, respiratory system resistance, functional residual capacity (FRC), and tidal volume immediately before feeds and at 20, 60, and 120 min after feeds, and again the next day on continuous feeds. (elsevier.com)
  • CONCLUSIONS: Morbid obesity and super obesity have negative effects on hemodynamics and respiratory mechanics. (biomedsearch.com)
  • Marchette, B. / Endotoxin-induced changes in pulmonary hemodynamics and respiratory mechanics : Role of lipoxygenase and cyclooxygenase products . (elsevier.com)
  • Driving pressure has been proposed as a major determinant of outcome in patients with acute respiratory distress syndrome (ARDS), but there is little data examining the association between pulmonary mechanics, including driving pressure, and outcomes in mechanically ventilated patients without ARDS. (ovid.com)
  • Main outcome measures Tidal volume by respiratory inductance plethysmography, pleural pressure estimated by oesophageal pressure, and gas exchange were evaluated at each setting and used to compute breathing pattern parameters, lung mechanics and work of breathing (WOB). (bmj.com)
  • Tidal volume apparent similarity disappears in assist/control: automated respiratory cycle tidal volume (4.8 +/- 1.0 mL/kg) is significantly lower than for ventilator respiratory cycle (5.6 +/- 1.8 mL/kg). (uliege.be)
  • However, no major studies in children with ARDS have investigated the role of different levels of PEEP and tidal volume on the partitioned respiratory mechanic (lung and chest wall), stress (transpulmonary pressure) and strain (inflated volume above the functional residual capacity). (springeropen.com)
  • The investigators aim to compare the respiratory mechanics in acute lung injury (ALI)/acute respiratory diseases syndrome (ARDS) patients with and without pleural effusion. (clinicaltrials.gov)
  • In ALI/ARDS we evaluated the respiratory mechanics (respiratory system, chest wall and lung elastance) at the bedside while pleural effusion was evaluated with CT scan. (clinicaltrials.gov)
  • For example, contemporary MV strategies for severe asthma totally differ from acute respiratory distress syndrome (ARDS). (biomedcentral.com)
  • The aim of this study was to evaluate in children with ARDS how the respiratory mechanics and stress/strain are affected compared with normal subjects. (springeropen.com)
  • This reflected a decrease in ERV (approximately 0.5 L) and in IC (inspiratory capacity, approximately 1.7 L) that could be attributed to a marked weakening of the respiratory muscles. (lu.se)
  • De Troyer A, Bastenier J, Delhez L (1980) Function of respiratory muscles during partial curarization in humans. (springer.com)
  • These studies will contribute to the development of specific and objective tests for diaphragmatic fatigue in man which can be used to evaluate less invasive ways of assessing the balance between mechanical load and endurance of the respiratory muscles in patients with respiratory failure. (elsevier.com)
  • At FRC, the respiratory muscles are relaxed and the elastic recoil of the lungs is equal in magnitude but opposite in direction to the elastic recoil of the chest wall and intrapleural pressure is subatmospheric, at about - 5 cmH20. (pivares.com)
  • Central fatigue is a reversible decrease in central neural respiratory drive caused by overuse of the muscles. (88bits.com)
  • The first section deals with the pressures exerted by the passive respiratory system and the respiratory muscles under static conditions and the second the pressures which develop with the breathing movements (dynamics). (88bits.com)
  • The elasticity of these muscles is crucial to the health of the respiratory system and to maximize its functional capabilities. (wikipedia.org)
  • Along with the diaphragm, the intercostal muscles are one of the most important groups of respiratory muscles. (wikipedia.org)
  • The involvement of these muscles seems to depend on the degree of respiratory effort. (wikipedia.org)
  • Subjects were instrumented with an esophageal balloon for the assessment of respiratory mechanics. (nih.gov)
  • Assessment of respiratory mechanics was done by the forced oscillation technique (FOT), and cardiovascular autonomic function was recorded by heart rate variability analysis (HRV). (elsevier.pt)
  • They note that perioperative complications are predominantly respiratory, so respiratory assessment is of paramount importance. (anaesthetist.com)
  • Visual assessment determined assisted leak-free optimal respiratory cycles (selected respiratory cycles). (uliege.be)
  • 8-14 While the majority of previous studies demonstrate that sevoflurane exerts a protecting effect against bronchoconstriction, 9,11-15 respiratory resistance also increases under sevoflurane after induction of anesthesia 16 and after tracheal intubation. (asahq.org)
  • 17 Desflurane is more controversial: It reduces bronchoconstriction 8,14,18-21 and has no effect on basal 22 and elevated airway tone, 9 but it does irritate the airways as manifested by an elevated respiratory resistance. (asahq.org)
  • 9,17 The aim of the current study was to compare the effects of sevoflurane and desflurane on respiratory mechanics in children with normal and susceptible airways by evaluating airway resistance and respiratory tissue mechanics. (asahq.org)
  • 3 Using the rapid end-inspiratory occlusion technique, they measured the interrupter resistance (Rint,rs) of the respiratory system in healthy subjects anesthetized with nitrous oxide (N 2 O) and found that, during hypocapnia, Rint,rs was significantly higher than during normocapnia. (asahq.org)
  • Adult respiratory function mechanics analyzers can measure, in addition to diagnostic spirometer measurements, parameters such as functional residual capacity, diffusing capacity of the lungs for carbon monoxide, and airway resistance. (optometricmanagement.com)
  • When positive pressure is applied to the respiratory system, advance analysis of respiratory mechanics can discriminate the different elements of WOB according to equation of motion: resistive component (the resistance to displacement of a determined gas flow), elastic component (elastic opposition to a determined change of volume) and a threshold load. (biomedcentral.com)
  • The respiratory system resistance and its components can be determined using the Forced Oscillation Technique (FOT), described by Dubois et al. (elsevier.pt)
  • The method may include using a dynamic respiratory mechanics model or a static respiratory mechanics model that requires use of a pause maneuver to collect the necessary data. (patentsencyclopedia.com)
  • 3. The method of claim 2 wherein the dynamic respiratory mechanics model requires input of a lung volume change over a predetermined time period and the method further comprises:calculating a leak-compensated lung volume for the predetermined time period based on leak-compensated lung flows associated with the predetermined time period. (patentsencyclopedia.com)
  • Estimation of Respiratory Mechanics (Respiratory System, Chest Wall and Lung Elastance) and Pleural Effusion at the Bedside With CT Scan. (clinicaltrials.gov)
  • Respiratory mechanics were measured just before the commencement of CPB and within approximately 2 h after the cessation of CPB, with the chest closed. (nih.gov)
  • The present study reports data on respiratory function of lung and chest wall following the 180 days long European - Russian EuroMir '95 space mission. (lu.se)
  • Post-flight pressure-volume curves of the lung, chest wall and total respiratory system are equal to preflight ones. (lu.se)
  • In a subject with an open, unobstructed airway the respiratory system (Chest wall and lungs) will equilibrate itself at a specific level as a result of the opposing forces. (pivares.com)
  • Objective: To study the relative contribution of the lung and the chest wall on the total respiratory system mechanics, gas exchange, and work of breathing in sedated-paralyzed normal subjects and morbidly obese patients, in the postoperative period. (elsevier.com)
  • Methods: In ten normal subjects (normal) and ten morbidly obese patients (obese), we partitioned the total respiratory mechanics (rs) into its lung (L) and chest wall (w) components using the esophageal balloon technique together with airway occlusion technique, during constant flow inflation. (elsevier.com)
  • Conclusion: Sedated-paralyzed morbidly obese patients, compared with normal subjects, are characterised by marked derangements in lung and chest wall mechanics and reduced lung volume after abdominal surgery. (elsevier.com)
  • For each point on the y-axis [i.e. volume applied], the pressure returned by the respiratory system is a summation of the respective recoil pressures of the passive lungs and chest wall individually. (pulmccm.org)
  • Surgical correction of these cardiac defects frequently involves the use of cardiopulmonary bypass (CPB), during which the lung may be partially or completely atelectatic for lengthy periods, further compromising lung mechanics. (nih.gov)
  • The combined therapy of simvastatin and vein infusion of hyperoxic fluid can effectively improve the cardiac function, blood lipid level, respiratory mechanics of patients with COPD plus CHD, and effectively reduce level of airway inflammation factors. (alliedacademies.org)
  • Effects of lung recruitment maneuver and positive end-expiratory pressure on lung volume, respiratory mechanics and alveolar gas mixing in patients ventilated after cardiac surgery. (semanticscholar.org)
  • Accordingly, linking the physiologies of the cardiac and thoracic pumps will facilitate acquisition and interpretation of hemodynamic data as well as provide rationale for optimizing respiratory mechanics. (pulmccm.org)
  • A ppoDLCO less than 40% predicted for that patient correlates with increased respiratory and cardiac complications, and is independent of FEV 1 . (anaesthetist.com)
  • The cardiac cycle: cardiac mechanics, regulation of cardiac contractility. (unige.it)
  • Time-frequency analysis is used to derive cardiac and respiratory parameters, as well as their evolution in time, during ventilator weaning in 130 patients. (ibecbarcelona.eu)
  • Now we're gonna see many similarities of the respiratory system to the cardiovascular system. (coursera.org)
  • In critically ill patients, MHI resulted in an improvement in lung mechanics and an improvement in gas exchange in patients with lung disease due to extrapulmonary events and did not result in impairment of the cardiovascular system. (ovid.com)
  • The focus of this book is the evolution of cardiovascular and respiratory control in vertebrates. (springer.com)
  • "Respiratory, cardiovascular and renal pathobiology and bioengineering " of IDIBAPS. (ub.edu)
  • Starting from the functioning mechanisms of the neuron and the nervous system, the course provide the elements to understand the functions of the muscular, cardiovascular, respiratory, renal, endocrine, digestive systems and in particular of the stomatognathic system. (unige.it)
  • The aim of the teaching is to provide students of the degree course with the basic notions of physiology of the nervous and endocrine systems and the control exercised in vegetative and relationship life and the functioning of the systems (cardiovascular, respiratory, renal and digestive) which supervise the vegetative life and their dynamic integration in the maintenance of homeostasis. (unige.it)
  • At the end of the course, the student must know and be able to analytically describe the basic notions of Physiology of the cardiovascular, renal, respiratory, nervous, endocrine, muscular, digestive, general physiology and stomatognathic sistems. (unige.it)
  • In infants with respiratory distress syndrome (RDS), the application of either NCPAP or HHHFNC resulted in equivalent lung function and work of breathing when they applied similar distending pressures. (bmj.com)
  • MI-E at high pressures improves respiratory mechanics of critical patients. (deepdyve.com)
  • Measured respiratory pressures were PIP 29 (26-31), PPL 24 (20-26), tPEEP 9 [8-11] cmH2O. (biomedcentral.com)
  • Airway and esophageal balloon pressures and respiratory flows were measured to calculate respiratory mechanics. (anesthesiaexperts.com)
  • Zaynktooksians of the book Applied Physiology in Respiratory Mechanics Zaynktooks. (kuechen-news.de)
  • Applied Physiology in Respiratory Mechanics by C. Straus, I. Arnulf, T. Similowsky (auth. (stanawtrey.com)
  • The control group of children (n = 20) had healthy lungs with no history of cardiopulmonary disease, including respiratory tract infections in the past 4 weeks before surgery. (asahq.org)
  • We conclude that a detailed, comparative study of respiratory system mechanics shows some evidence of structural differences among the lungs of various species but that, in general, rodent lungs obey scaling laws similar to those described in other species. (elsevier.com)
  • And around the heart and pericardium lies the respiratory pump - the lungs within the thorax - itself varying by pressure, volume and frequency. (pulmccm.org)
  • In land animals the respiratory surface is internalized as linings of the lungs . (wikipedia.org)
  • It is based on numerical simulation and shows, numerically and graphically, how the elastic and resistive properties of the lungs and rib cage determine the mechanics of the respiratory cycle. (ersjournals.com)
  • The Impacts of Super Obesity Versus Morbid Obesity on Respiratory Mechanics and Simple Hemodynamic Parameters During Bariatric Surgery. (biomedsearch.com)
  • BACKGROUND: This study was designed to determine the impact of the degree of obesity on respiratory mechanics and simple hemodynamic parameters at laparoscopic bariatric surgery. (biomedsearch.com)
  • We conclude that respiratory mechanical parameters of mice (after normalization with body weight) are similar to those of guinea pigs and rats and that forced expiratory maneuver is a useful technique to detect airway constriction in this species. (elsevier.com)
  • Selected optimal respiratory cycles should allow calculation of respiratory mechanic parameters focusing on patient-ventilator interaction. (uliege.be)
  • Coefficients of variation decrease for all automated respiratory cycle parameters in all infants. (uliege.be)
  • Averaged parameters derived from automated respiratory cycles are more precise and could be displayed by ventilators to improve real-time fine tuning of ventilator settings. (uliege.be)
  • The classic SLICE method [ 1 ] determines parameters of the respiratory system for abutted volume ranges. (beds.ac.uk)
  • The Gliding-SLICE method allows one to calculate mechanical parameters of the respiratory system quasi-continually. (beds.ac.uk)
  • Results The gas content in different locations of a respiratory system was estimated by the model and the sensitivity of gas content in expiration to the undetermined parameters was evaluated. (bvsalud.org)
  • Changes in lung mechanics produced by continuous thoracic negative pressure, (CNP) were determined in twelve newborn infants with idiopathic respiratory distress syndrome (IRDS). (aappublications.org)
  • Objective To compare the effect of heated, humidified, high-flow nasal cannula (HHHFNC) and nasal continuous positive airways pressure (NCPAP) on lung function and mechanics in preterm infants with respiratory distress syndrome (RDS) at the same level of retropharyngeal pressure (P rp ). (bmj.com)
  • 1-6 As a consequence, it is being increasingly used in neonatal intensive care units in a variety of clinical situations, 7-12 most recently postextubation or as initial approach to neonatal respiratory distress syndrome (RDS). (bmj.com)
  • ALTHOUGH patients with severe brain injury are routinely made to hyperventilate 1 and permissive hypercapnia is advocated for patients with acute respiratory distress syndrome, 2 there are no reports on the effects of changes in partial pressure of arterial carbon dioxide (Pco 2 ) on respiratory mechanics in patients undergoing mechanical ventiliation and healthy subjects, except for the report by Don and Robson. (asahq.org)
  • 5 , 6 However, clinical studies have shown that PSV can result in respiratory distress and patient-ventilator asynchrony. (rcjournal.com)
  • Use of these while at rest is often interpreted as a sign of respiratory distress. (wikipedia.org)
  • The use of 5 cmH2O of PEEP was helpful to prevent the deterioration of lung mechanics that occurs during surgery. (minervamedica.it)
  • and evaluate if driving pressure contributed information beyond that provided by other pulmonary mechanics. (ovid.com)
  • Infants younger than 1 year old with acute respiratory failure caused by severe bronchiolitis underwent neuromuscular blockade, tracheal intubation and volume controlled MV. Shortly after intubation studies of pulmonary mechanics were performed using inspiratory and expiratory breath hold. (biomedcentral.com)
  • Mishchuk V, Lerchuk O, Dvorakevych A, Khomyak V. Features of respiratory support during laparoscopic correction of inguinal hernias in children. (termedia.pl)
  • In our study, we compared the haemodynamic and respiratory mechanics of P-LMA and I-Gel in laparoscopic cholecystectomy. (journalcra.com)
  • Objective: To compare the haemodynamic stability and respiratory mechanics between I-gel and proseal LMA in laparoscopic surgeries. (journalcra.com)
  • The group ZEEP exhibited a marked decrease of expiratory flow and a worsening of respiratory mechanics at the end of surgery. (minervamedica.it)
  • Lai, YL & Chou, HC 2000, ' Respiratory mechanics and maximal expiratory flow in the anesthetized mouse ', Journal of Applied Physiology , vol. 88, no. 3, pp. 939-943. (elsevier.com)
  • However, the quantitative partitioning of respiratory mechanics and transpulmonary pressure (Pl) during robotic surgery is not well described. (anesthesiaexperts.com)
  • for example, for separated view on inspiratory and expiratory respiratory mechanics. (beds.ac.uk)
  • This study aimed to investigate the association between respiratory mechanics and autonomic modulation in morbidly obese patients. (elsevier.pt)
  • This Program Project combines the disciplines of engineering mechanics, physiology, pharmacology, anesthesiology, medicine and critical care to study the mechanical behavior of the respiratory system in health and disease. (elsevier.com)
  • Finally, there is the problem of coupling fluid and solid mechanics to understand the overall behavior of the respiratory system. (springer.com)
  • The research of my group is aimed at furthering our understanding of the mechanical behavior of the respiratory system to improve the diagnosis and treatment of respiratory diseases. (ub.edu)
  • BHR is the common denominator of many pulmonary conditions in children, such as asthma, upper respiratory tract infection, 2-4 cystic fibrosis, bronchopulmonary dysplasia, and passive smoking. (asahq.org)
  • The children of the AS group (n = 20) were categorized as having AS defined by doctor-diagnosed asthma (n = 10) or a recent upper respiratory tract infection (n = 10) in the past 2 weeks before anesthesia. (asahq.org)
  • In humans and other mammals , the anatomy of a typical respiratory system is the respiratory tract . (wikipedia.org)
  • The tract is divided into an upper and a lower respiratory tract . (wikipedia.org)
  • The branching airways of the lower tract are often described as the respiratory tree or tracheobronchial tree (Fig. 2). (wikipedia.org)
  • the upper respiratory tract and the lower. (greek.doctor)
  • Treatment plan comparison in acute and chronic respiratory tract diseases: an observational study of doxophylline vs. theophylline" (PDF). (wikipedia.org)
  • Shunt fraction and high V/Q were measured using variation of inspired oxygen fraction and measurement of respiratory gas concentration and arterial blood gas. (anesthesiaexperts.com)
  • American Review of Respiratory Disease , 134 (6), 1149-1157. (elsevier.com)
  • http://journals.lww.com/pccmjournal/Abstract/publishahead/Automated_respiratory_cycles_selection_is_highly.99350. (uliege.be)
  • Respiratory mechanics in airways obstruction associated with inspiratory dyspnoea. (bmj.com)
  • At the organ level, we study the mechanical properties of the airways and lung tissues and the alterations of the mechanical function associated with respiratory diseases. (ub.edu)
  • Mechanical insufflation/exsufflation improves respiratory mechanics in critical care: Randomized. (deepdyve.com)
  • Automated respiratory cycles selection is highly specific and improves respiratory mechanics analysis. (uliege.be)
  • And so we are going to start off talking about the general anatomy of the lung and then some of the mechanics of breathing. (coursera.org)
  • So just in a very low mag view of the anatomy of the respiratory system where it's going to start with the nose and the mouth, where air enters the body. (coursera.org)
  • This is a very low magnification view of the anatomy of the respiratory system. (coursera.org)
  • Next, in 10 of 11 studied preterm infants (0.77 ± 0.24 kg), no-to-minimal leak was confirmed based on excellent agreement between mPtr (meas) and mPtr (pred), and consequently, their oscillatory respiratory mechanics were evaluated. (nih.gov)
  • Patients 20 preterm infants (gestational age: 31±1 wks) with mild-moderate RDS requiring non-invasive respiratory support within 96 h after birth. (bmj.com)
  • Only in 15 out of 20 infants it was possible to compare HHHFNC and NCPAP at a P rp of 2 and 4 cmH 2 O. No statistically significant differences were found in breathing pattern, gas exchange, lung mechanics and total WOB. (bmj.com)
  • Heated, humidified, high-flow nasal cannula (HHHFNC) provides effective non-invasive respiratory support to preterm infants in a variety of clinical conditions. (bmj.com)
  • Our aim was to discriminate the components of the working pressure of the respiratory system in infants on MV with severe bronchiolitis admitted to two PICU's. (biomedcentral.com)
  • Analysis of respiratory mechanics of infants with severe bronchiolitis receiving MV shows that the elastic component of the working pressure of the respiratory system is the most important. (biomedcentral.com)
  • This study was designed to determine whether respiratory mechanics in stable, very low birth weight infants changed after replacing intermittent feeds with continuous feeding. (elsevier.com)
  • Respiratory mechanics were measured using the SensorMedics 2600 Pediatric Pulmonary Cart (Yorba Linda, CA). We studied 16 infants (gestational age 28.3 ± 3.7 weeks, mean ± SD) at a postnatal age of 10-82 days. (elsevier.com)
  • The data suggest that static respiratory mechanics in stable, very low birth weight infants are not affected by changing enteral feeds from intermittent gavage to a continuous schedule. (elsevier.com)
  • Bronchiolitis due to respiratory syncytial virus was the main etiology (93.8%) and 31.3% had comorbidities. (biomedcentral.com)
  • Respiratory mechanics are the expression of lung function trough measures of pressure and flow. (biomedcentral.com)
  • New findings highlight that lying in the prone position improves lung function, respiratory mechanics, blood oxygenation, and ultimately, reduces mortality. (prweb.com)
  • Mechanical dysfunction of the lung is associated with prevalent respiratory diseases. (ub.edu)
  • Deterioration of Nighttime Respiratory Mechanics in Chronic Obstructive Pulmonary Disease: Impact of Bronchodilator Therapy. (onmedica.com)
  • Chronic Obstructive Pulmonary Disease (COPD) is associated with nighttime respiratory symptoms, poor sleep quality, and increased risk of nocturnal mortality. (onmedica.com)
  • The company is focused on cardiopulmonary diagnostics, respiratory core lab services, and disease management solutions designed to improve health care productivity while increasing the overall quality of care. (optometricmanagement.com)
  • The study hypothesis was that tracheostomy would result in improved pulmonary function through changes in respiratory mechanics. (nih.gov)