Recording of change in the size of a part as modified by the circulation in it.
Measurement of the volume of gas in the lungs, including that which is trapped in poorly communicating air spaces. It is of particular use in chronic obstructive pulmonary disease and emphysema. (Segen, Dictionary of Modern Medicine, 1992)
Recording changes in electrical impedance between electrodes placed on opposite sides of a part of the body, as a measure of volume changes in the path of the current. (Stedman, 25th ed)
Part of the arm in humans and primates extending from the ELBOW to the WRIST.
The flow of BLOOD through or around an organ or region of the body.
The inferior part of the lower extremity between the KNEE and the ANKLE.
A competitive inhibitor of nitric oxide synthetase.
The physiological widening of BLOOD VESSELS by relaxing the underlying VASCULAR SMOOTH MUSCLE.
A powerful vasodilator used in emergencies to lower blood pressure or to improve cardiac function. It is also an indicator for free sulfhydryl groups in proteins.
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.
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)
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 vessels carrying blood away from the capillary beds.
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).
The presence of an increased amount of blood in a body part or an organ leading to congestion or engorgement of blood vessels. Hyperemia can be due to increase of blood flow into the area (active or arterial), or due to obstruction of outflow of blood from the area (passive or venous).
Drugs used to cause dilation of the blood vessels.
The volume of air inspired or expired during each normal, quiet respiratory cycle. Common abbreviations are TV or V with subscript T.
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.
The force that opposes the flow of BLOOD through a vascular bed. It is equal to the difference in BLOOD PRESSURE across the vascular bed divided by the CARDIAC OUTPUT.
The outer margins of the thorax containing SKIN, deep FASCIA; THORACIC VERTEBRAE; RIBS; STERNUM; and MUSCLES.
The total volume of gas inspired or expired per unit of time, usually measured in liters per minute.
The blood pressure in the VEINS. It is usually measured to assess the filling PRESSURE to the HEART VENTRICLE.
Regional infusion of drugs via an arterial catheter. Often a pump is used to impel the drug through the catheter. Used in therapy of cancer, upper gastrointestinal hemorrhage, infection, and peripheral vascular disease.
A quaternary ammonium parasympathomimetic agent with the muscarinic actions of ACETYLCHOLINE. It is hydrolyzed by ACETYLCHOLINESTERASE at a considerably slower rate than ACETYLCHOLINE and is more resistant to hydrolysis by nonspecific CHOLINESTERASES so that its actions are more prolonged. It is used as a parasympathomimetic bronchoconstrictor agent and as a diagnostic aid for bronchial asthma. (From Martindale, The Extra Pharmacopoeia, 30th ed, p1116)
An occupational disorder resulting from prolonged exposure to vibration, affecting the fingers, hands, and forearms. It occurs in workers who regularly use vibrating tools such as jackhammers, power chain saws, riveters, etc. Symptoms include episodic finger blanching, NUMBNESS, tingling, and loss of nerve sensitivity.
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.
Impaired venous blood flow or venous return (venous stasis), usually caused by inadequate venous valves. Venous insufficiency often occurs in the legs, and is associated with EDEMA and sometimes with VENOUS STASIS ULCERS at the ankle.
The measure of a BLOOD VESSEL's ability to increase the volume of BLOOD it holds without a large increase in BLOOD PRESSURE. The vascular capacitance is equal to the change in volume divided by the change in pressure.
A condition characterized by a chronically swollen limb, often a leg with stasis dermatitis and ulcerations. This syndrome can appear soon after phlebitis or years later. Postphlebitic syndrome is the result of damaged or incompetent venous valves in the limbs. Distended, tortuous VARICOSE VEINS are usually present. Leg pain may occur after long period of standing.
A neurotransmitter found at neuromuscular junctions, autonomic ganglia, parasympathetic effector junctions, a subset of sympathetic effector junctions, and at many sites in the central nervous system.
PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS.
Measurement of the various processes involved in the act of respiration: inspiration, expiration, oxygen and carbon dioxide exchange, lung volume and compliance, etc.
A value equal to the total volume flow divided by the cross-sectional area of the vascular bed.
Single pavement layer of cells which line the luminal surface of the entire vascular system and regulate the transport of macromolecules and blood components.
Radiographic visualization or recording of a vein after the injection of contrast medium.
Inflammation of a vein associated with a blood clot (THROMBUS).
The continuation of the axillary artery; it branches into the radial and ulnar arteries.
The number of times the HEART VENTRICLES contract per unit of time, usually per minute.
The movement and the forces involved in the movement of the blood through the CARDIOVASCULAR SYSTEM.
Agents causing the narrowing of the lumen of a bronchus or bronchiole.
Any hindrance to the passage of air into and out of the lungs.
Measurement of volume of air inhaled or exhaled by the lung.
Translocation of body fluids from one compartment to another, such as from the vascular to the interstitial compartments. Fluid shifts are associated with profound changes in vascular permeability and WATER-ELECTROLYTE IMBALANCE. The shift can also be from the lower body to the upper body as in conditions of weightlessness.
The physiological narrowing of BLOOD VESSELS by contraction of the VASCULAR SMOOTH MUSCLE.
The mixture of gases present in the earth's atmosphere consisting of oxygen, nitrogen, carbon dioxide, and small amounts of other gases.
The vein formed by the union of the anterior and posterior tibial veins; it courses through the popliteal space and becomes the femoral vein.
The volume of air remaining in the LUNGS at the end of a maximal expiration. Common abbreviation is RV.
Either of the pair of organs occupying the cavity of the thorax that effect the aeration of the blood.
The position or attitude of the body.
External decompression applied to the lower body. It is used to study orthostatic intolerance and the effects of gravitation and acceleration, to produce simulated hemorrhage in physiologic research, to assess cardiovascular function, and to reduce abdominal stress during childbirth.
A transient absence of spontaneous respiration.
The act of BREATHING in.
Studies comparing two or more treatments or interventions in which the subjects or patients, upon completion of the course of one treatment, are switched to another. In the case of two treatments, A and B, half the subjects are randomly allocated to receive these in the order A, B and half to receive them in the order B, A. A criticism of this design is that effects of the first treatment may carry over into the period when the second is given. (Last, A Dictionary of Epidemiology, 2d ed)
Volume of circulating BLOOD. It is the sum of the PLASMA VOLUME and ERYTHROCYTE VOLUME.
Helium. A noble gas with the atomic symbol He, atomic number 2, and atomic weight 4.003. It is a colorless, odorless, tasteless gas that is not combustible and does not support combustion. It was first detected in the sun and is now obtained from natural gas. Medically it is used as a diluent for other gases, being especially useful with oxygen in the treatment of certain cases of respiratory obstruction, and as a vehicle for general anesthetics. (Dorland, 27th ed)
The vein accompanying the femoral artery in the same sheath; it is a continuation of the popliteal vein and becomes the external iliac vein.
The neural systems which act on VASCULAR SMOOTH MUSCLE to control blood vessel diameter. The major neural control is through the sympathetic nervous system.
A clinical manifestation of abnormal increase in the amount of carbon dioxide in arterial blood.
An idiopathic vascular disorder characterized by bilateral Raynaud phenomenon, the abrupt onset of digital paleness or CYANOSIS in response to cold exposure or stress.
Drugs used to cause constriction of the blood vessels.
A free radical gas produced endogenously by a variety of mammalian cells, synthesized from ARGININE by NITRIC OXIDE SYNTHASE. Nitric oxide is one of the ENDOTHELIUM-DEPENDENT RELAXING FACTORS released by the vascular endothelium and mediates VASODILATION. It also inhibits platelet aggregation, induces disaggregation of aggregated platelets, and inhibits platelet adhesion to the vascular endothelium. Nitric oxide activates cytosolic GUANYLATE CYCLASE and thus elevates intracellular levels of CYCLIC GMP.
The posture of an individual lying face up.
A volatile vasodilator which relieves ANGINA PECTORIS by stimulating GUANYLATE CYCLASE and lowering cytosolic calcium. It is also sometimes used for TOCOLYSIS and explosives.
The TEMPERATURE at the outer surface of the body.
Enlarged and tortuous VEINS.
The measurement of frequency or oscillation changes.
The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results.
Four or five slender jointed digits in humans and primates, attached to each HAND.
These include the muscles of the DIAPHRAGM and the INTERCOSTAL MUSCLES.
Distensibility measure of a chamber such as the lungs (LUNG COMPLIANCE) or bladder. Compliance is expressed as a change in volume per unit change in pressure.
Narrowing of the caliber of the BRONCHI, physiologically or as a result of pharmacological intervention.
The relationship between the dose of an administered drug and the response of the organism to the drug.
The blood pressure in the central large VEINS of the body. It is distinguished from peripheral venous pressure which occurs in an extremity.
Skin breakdown or ulceration caused by VARICOSE VEINS in which there is too much hydrostatic pressure in the superficial venous system of the leg. Venous hypertension leads to increased pressure in the capillary bed, transudation of fluid and proteins into the interstitial space, altering blood flow and supply of nutrients to the skin and subcutaneous tissues, and eventual ulceration.
A statistical technique that isolates and assesses the contributions of categorical independent variables to variation in the mean of a continuous dependent variable.
Double-layered inflatable suits which, when inflated, exert pressure on the lower part of the wearer's body. The suits are used to improve or stabilize the circulatory state, i.e., to prevent hypotension, control hemorrhage, and regulate blood pressure. The suits are also used by pilots under positive acceleration.
The thoracolumbar division of the autonomic nervous system. Sympathetic preganglionic fibers originate in neurons of the intermediolateral column of the spinal cord and project to the paravertebral and prevertebral ganglia, which in turn project to target organs. The sympathetic nervous system mediates the body's response to stressful situations, i.e., the fight or flight reactions. It often acts reciprocally to the parasympathetic system.
Relatively complete absence of oxygen in one or more tissues.
A method of studying a drug or procedure in which both the subjects and investigators are kept unaware of who is actually getting which specific treatment.
The range or frequency distribution of a measurement in a population (of organisms, organs or things) that has not been selected for the presence of disease or abnormality.
The movement of the BLOOD as it is pumped through the CARDIOVASCULAR SYSTEM.
Delivery of drugs into an artery.
The number of times an organism breathes with the lungs (RESPIRATION) per unit time, usually per minute.
That portion of the body that lies between the THORAX and the PELVIS.
Plethysmographic determination in which the intensity of light reflected from the skin surface and the red cells below is measured to determine the blood volume of the respective area. There are two types, transmission and reflectance.
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.
A standard and widely accepted diagnostic test used to identify patients who have a vasodepressive and/or cardioinhibitory response as a cause of syncope. (From Braunwald, Heart Disease, 7th ed)
The musculofibrous partition that separates the THORACIC CAVITY from the ABDOMINAL CAVITY. Contraction of the diaphragm increases the volume of the thoracic cavity aiding INHALATION.
The relative amounts of various components in the body, such as percentage of body fat.
Persistently high systemic arterial BLOOD PRESSURE. Based on multiple readings (BLOOD PRESSURE DETERMINATION), hypertension is currently defined as when SYSTOLIC PRESSURE is consistently greater than 140 mm Hg or when DIASTOLIC PRESSURE is consistently 90 mm Hg or more.
Devices for the compression of a blood vessel by application around an extremity to control the circulation and prevent the flow of blood to or from the distal area. (From Dorland, 28th ed)
The rate of airflow measured during a FORCED VITAL CAPACITY determination.
Ultrasonography applying the Doppler effect combined with real-time imaging. The real-time image is created by rapid movement of the ultrasound beam. A powerful advantage of this technique is the ability to estimate the velocity of flow from the Doppler shift frequency.
Precursor of epinephrine that is secreted by the adrenal medulla and is a widespread central and autonomic neurotransmitter. Norepinephrine is the principal transmitter of most postganglionic sympathetic fibers and of the diffuse projection system in the brain arising from the locus ceruleus. It is also found in plants and is used pharmacologically as a sympathomimetic.
A vein on either side of the body which is formed by the union of the external and internal iliac veins and passes upward to join with its fellow of the opposite side to form the inferior vena cava.
A short-acting beta-2 adrenergic agonist that is primarily used as a bronchodilator agent to treat ASTHMA. Albuterol is prepared as a racemic mixture of R(-) and S(+) stereoisomers. The stereospecific preparation of R(-) isomer of albuterol is referred to as levalbuterol.
Elements of limited time intervals, contributing to particular results or situations.
The volume of air that is exhaled by a maximal expiration following a maximal inspiration.
The vessels carrying blood away from the heart.
Agents that cause an increase in the expansion of a bronchus or bronchial tubes.
An NADPH-dependent enzyme that catalyzes the conversion of L-ARGININE and OXYGEN to produce CITRULLINE and NITRIC OXIDE.
A nonapeptide messenger that is enzymatically produced from KALLIDIN in the blood where it is a potent but short-lived agent of arteriolar dilation and increased capillary permeability. Bradykinin is also released from MAST CELLS during asthma attacks, from gut walls as a gastrointestinal vasodilator, from damaged tissues as a pain signal, and may be a neurotransmitter.
Physical activity which is usually regular and done with the intention of improving or maintaining PHYSICAL FITNESS or HEALTH. Contrast with PHYSICAL EXERTION which is concerned largely with the physiologic and metabolic response to energy expenditure.
Material used for wrapping or binding any part of the body.
Tendency of the smooth muscle of the tracheobronchial tree to contract more intensely in response to a given stimulus than it does in the response seen in normal individuals. This condition is present in virtually all symptomatic patients with asthma. The most prominent manifestation of this smooth muscle contraction is a decrease in airway caliber that can be readily measured in the pulmonary function laboratory.
Compounds or agents that combine with an enzyme in such a manner as to prevent the normal substrate-enzyme combination and the catalytic reaction.
Tests involving inhalation of allergens (nebulized or in dust form), nebulized pharmacologically active solutions (e.g., histamine, methacholine), or control solutions, followed by assessment of respiratory function. These tests are used in the diagnosis of asthma.
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)
A subtype of endothelin receptor found predominantly in the VASCULAR SMOOTH MUSCLE. It has a high affinity for ENDOTHELIN-1 and ENDOTHELIN-2.
A type of impedance plethysmography in which bioelectrical impedance is measured between electrodes positioned around the neck and around the lower thorax. It is used principally to calculate stroke volume and cardiac volume, but it is also related to myocardial contractility, thoracic fluid content, and circulation to the extremities.
Muscles forming the ABDOMINAL WALL including RECTUS ABDOMINIS, external and internal oblique muscles, transversus abdominis, and quadratus abdominis. (from Stedman, 25th ed)
Binary classification measures to assess test results. Sensitivity or recall rate is the proportion of true positives. Specificity is the probability of correctly determining the absence of a condition. (From Last, Dictionary of Epidemiology, 2d ed)
The farthest or outermost projections of the body, such as the HAND and FOOT.
The act of constricting.
The formation or presence of a blood clot (THROMBUS) within a vein.
An abnormally low volume of blood circulating through the body. It may result in hypovolemic shock (see SHOCK).
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)

Peripheral hemodynamics evaluated by acceleration plethysmography in workers exposed to lead. (1/1109)

To clarify the effect of lead exposure on peripheral hemodynamics, acceleration plethysmography (APG) was performed for 48 male subjects occupationally exposed to lead (exposure group) and 43 male subjects with no history of occupational exposure to lead (control group). In the exposure group, the blood lead concentration (Pb-B) was also measured. Each APG parameter was assessed by comparing measured data with the standard aging curves. A significant negative correlation was obtained between the parameter--b/a and Pb-B. The exposure group showed significantly lower values of parameters--b/a (p < 0.01) and d/a (p < 0.05) than the control group. The parameter--b/a in the exposure group dose-dependently decreased with increases in length of working career (duration of exposure to lead) and Pb-B. The parameter--b/a significantly (p < 0.05) decreased in subjects with working careers of 5 years or more and in subjects whose Pb-B was 40 micrograms/100 ml or more. These results suggest that lead exposure affects peripheral hemodynamics as evaluated by APG.  (+info)

Effect of intensive therapy for heart failure on the vasodilator response to exercise. (2/1109)

OBJECTIVES: The purpose of the study was to evaluate the lower extremity vascular responsiveness to metabolic stimuli in patients with heart failure and to determine whether these responses improve acutely after intensive medical therapy. BACKGROUND: Metabolic regulation of vascular tone is an important determinant of blood flow, and may be abnormal in heart failure. METHODS: The leg blood flow responses were measured in 11 patients with nonedematous class III-IV heart failure before and after inpatient medical therapy and in 10 normal subjects. Venous occlusion plethysmography was used to measure peak blood flow and total hyperemia in the calf after arterial occlusion and also after isotonic ankle exercise. Measurements were repeated following short-term inpatient treatment with vasodilators and diuretics administered to decrease right atrial pressure (18+/-2 to 7+/-1 mm Hg), pulmonary wedge pressure (32+/-3 to 15+/-2 mm Hg), and systemic vascular resistance (1581+/-200 to 938+/-63 dynes.s.cm(-5), all p < 0.02). RESULTS: Leg blood flow at rest, after exercise, and during reactive hyperemia was less in heart failure patients than in control subjects. Resting leg blood flow did not increase significantly after medical therapy, but peak flow after the high level of exercise increased by 59% (p = 0.009). Total hyperemic volume in the recovery period increased by 73% (p = 0.03). Similarly, the peak leg blood flow response to ischemia increased by 88% (p = 0.04), whereas hyperemic volume rose by 98% (p = 0.1). CONCLUSIONS: The calf blood flow responses to metabolic stimuli are blunted in patients with severe heart failure, and improve rapidly with intensive medical therapy.  (+info)

Endothelium-dependent relaxation by acetylcholine is impaired in hypertriglyceridemic humans with normal levels of plasma LDL cholesterol. (3/1109)

OBJECTIVES: Patients with high triglyceride (of which very low density lipoproteins [VLDL] are the main carriers), but with normal low density lipoprotein (LDL) cholesterol levels, were examined for in vivo endothelium function status. BACKGROUND: Very low density lipoproteins inhibit endothelium-dependent, but not -independent, vasorelaxation in vitro. METHODS: Three groups were studied: 1) healthy volunteers (n = 10; triglyceride 1.24+/-0.14 mmol/liter, LDL cholesterol 2.99+/-0.24 mmol/liter); 2) hypertriglyceridemic (n = 11; triglyceride 6.97+/-1.19 mmol/liter, LDL cholesterol 2.17+/-0.2 mmol/liter, p < 0.05); and 3) hypercholesterolemic (n = 10; triglyceride 2.25+/-0.29 mmol/liter, LDL cholesterol 5.61+/-0.54 mmol/liter; p < 0.05) patients. Vasoactive responses to acetylcholine, sodium nitroprusside, noradrenaline, N(G)-monomethyl-L-arginine and postischemic hyperemia were determined using forearm venous occlusion plethysmography. RESULTS: Responses to acetylcholine (37 microg/min) were significantly dampened both in hypercholesterolemic (% increase in forearm blood flow: 268.2+/-62) and hypertriglyceridemic patients (232.6+/-45.2) when compared with controls (547.8+/-108.9; ANOVA p < 0.05). Responses to sodium nitroprusside (at 1.6 microg/min: controls vs. hypercholesterolemics vs. hypertriglyceridemic: 168.7+/- 25.1 vs. 140.6+/-38.9 vs. 178.5+/-54.5% increase), noradrenaline, N(G)-monomethyl-L-arginine and postischemic hyperemic responses were not different among the groups examined. CONCLUSIONS: Acetylcholine responses are impaired in patients with pathophysiologic levels of plasma triglycerides but normal plasma levels of LDL cholesterol. The impairment observed was comparable to that obtained in hypercholesterolemic patients. We conclude that impaired responses to acetylcholine normally associated with hypercholesterolemia also occur in hypertriglyceridemia. These findings identify a potential mechanism by which high plasma triglyceride levels may be atherogenic independent of LDL cholesterol levels.  (+info)

Endothelial dysfunction, impaired endogenous fibrinolysis, and cigarette smoking: a mechanism for arterial thrombosis and myocardial infarction. (4/1109)

BACKGROUND: Effective endogenous fibrinolysis requires rapid release of tissue plasminogen activator (tPA) from the vascular endothelium. Smoking is a known risk factor for arterial thrombosis and myocardial infarction, and it causes endothelial dysfunction. We therefore examined the effects of cigarette smoking on substance P-induced tPA release in vivo in humans. METHODS AND RESULTS: Blood flow and plasma fibrinolytic factors were measured in both forearms of 12 smokers and 12 age- and sex-matched nonsmokers who received unilateral brachial artery infusions of substance P (2 to 8 pmol/min). In both smokers and nonsmokers, substance P caused dose-dependent increases in blood flow and local release of plasma tPA antigen and activity (P<0.001 for all) but had no effect on the local release of plasminogen activator inhibitor type 1. Compared with nonsmokers, increases in forearm blood flow (P=0.03) and release of tPA antigen (P=0.04) and activity (P<0.001) caused by substance P were reduced in smokers. The area under the curve for release of tPA antigen and activity decreased by 51% and 53%, respectively. CONCLUSIONS: Cigarette smoking causes marked inhibition of substance P-induced tPA release in vivo in humans. This provides an important mechanism whereby endothelial dysfunction may increase the risk of atherothrombosis through a reduction in the acute fibrinolytic capacity.  (+info)

Comparison of two new methods for the measurement of lung volumes with two standard methods. (5/1109)

BACKGROUND: The two most commonly used methods for the measurement of lung volumes are helium dilution and body plethysmography. Two methods have been developed which are both easier and less time consuming to perform. Mathematical modelling uses complex calculations from the flow-volume loop to derive total lung capacity (TLC), and the nitrogen balance technique uses nitrogen from the atmosphere to calculate lung volume in a similar way to helium dilution. This study was designed to compare the two new methods with the two standard methods. METHODS: Sixty one subjects were studied, 23 with normal lung function, 17 with restrictive airway disease, and 21 with obstructive ventilatory defects. Each subject underwent repeated measurements of TLC by each of the four methods in random order. Reproducible values were obtained for each method according to BTS/ARTP guidelines. Bland-Altman plots were constructed for comparisons between the methods and paired t tests were used to assess differences in means. RESULTS: Bland-Altman plots showed that the differences between body plethysmography and helium dilution fell into clinically acceptable ranges (agreement limits +/-0.9 l). The agreement between mathematical modelling or the nitrogen balance technique and helium dilution or body plethysmography was poor (+/-1.8-3.4 l), especially for subjects with airflow obstruction. CONCLUSIONS: Neither of the new methods agrees sufficiently with standard methods to be useful in a clinical setting.  (+info)

Physiologic basis and interpretation of common indices of respiratory mechanical function. (6/1109)

Tests of pulmonary mechanical function may be used in determining the prominent site of pulmonary reaction to intervention. Responses may be localized from a knowledge of changes in lung resistance and compliance. A peripheral airway or parenchymal response is characterized by a decrease in lung compliance. A central airway reaction is characterized by an increase in pulmonary resistance. In mixed reactions both parameters may change. In this communication some of the physiologic determinants of pulmonary resistance and compliance are discussed and examples of localized responses given.  (+info)

Contribution of nitric oxide to beta2-adrenoceptor mediated vasodilatation in human forearm arterial vasculature. (7/1109)

AIMS: beta2-adrenoceptor agonists are generally considered to produce endothelium independent vasodilatation through adenylate cyclase. We determined whether nitric oxide contributes to beta2-adrenoceptor vasodilatation in human arterial vasculature. METHODS: Forearm blood flow responses to brachial intra-arterial infusions of ritodrine (2.5-50 microg min(-1)), a selective beta2-adrenoceptor agonist, were determined in 24 healthy, normotensive subjects (mean age 22 years, 5F) on two occasions with initial and concomitant administration of L-NMMA (800 microg min(-1)), an NO synthase inhibitor, or noradrenaline (5-30 ng min(-1)), a control constrictor not affecting basal NO activity. Responses to the endothelium dependent vasodilator scrotonin (n = 6) and an endothelium independent vasodilator GTN (n = 9) were also determined. RESULTS: Maximal dilatation to ritodrine during L-NMMA infusion (310+/-32%; mean+/-s.e.mean) was reduced compared to that during noradrenaline infusion (417+/-41%, P<0.05), as were summary responses (1023+/-101 vs 1415+/-130; P<0.05). Responses to GTN were unaffected by L-NMMA compared to noradrenaline; max 177+/-26 vs 169+/-20%, 95% CI for difference -33,48; P=0.68; summary response 361+/-51 vs 396+/-37, 95% CI -142,71; P=0.46. Dilator responses to serotonin were reduced by L-NMMA; max 64+/-20 vs 163+/-26%, P<0.01; summary response 129+/-36 vs 293+/-60; P<0.05) and to a greater extent than ritodrine (58+/-7 vs 25+/-14%, P<0.05). CONCLUSIONS: beta2-adrenoceptor mediated vasodilatation in the human forearm has an NO mediated component. The underlying mechanism for this effect is unclear, but flow mediated vasodilatation is unlikely to be responsible.  (+info)

Relationship between left ventricular mass and endothelium-dependent vasodilation in never-treated hypertensive patients. (8/1109)

BACKGROUND: Hypertensive patients are characterized by development of both left ventricular hypertrophy (LVH) and endothelial dysfunction METHODS AND RESULTS: We enrolled 65 never-treated hypertensive patients (36 men and 29 women aged 45.6+/-6.0 years) to assess the possible relationship between echocardiographic left ventricular mass (LVM) and endothelium-dependent vasodilation. Left ventricular measurements were performed at end diastole and end systole according to the recommendations of the American Society of Echocardiography and the Penn Convention. LVM was calculated with the Devereux formula and indexed by body surface area and height raised to the 2.7th power. The endothelial function was tested as responses of forearm vasculature to acetylcholine (ACh), an endothelium-dependent vasodilator (7.5, 15, and 30 microg. mL-1. min-1, each for 5 minutes), and sodium nitroprusside (SNP), an endothelium-independent vasodilator (0.8, 1.6, and 3.2 microg. mL-1. min-1, each for 5 minutes). Drugs were infused into the brachial artery, and forearm blood flow (FBF) was measured by strain-gauge plethysmography. A negative significant relationship between indexed LVM and peak of increase in FBF was found during ACh infusions (r=-0. 554; P<0.0001). In addition, hypertrophic patients had a significantly lower responsive to ACh than patients without LVH (the peak increase in FBF was 9.9+/-3.7 versus 16.1+/-8.1 mL per 100 mL of tissue per minute; P<0.0001). No significant correlation was observed between LVM and FBF during SNP infusion. CONCLUSIONS: Our data provide the first evidence that echocardiographic LVM in hypertensive patients is inversely related to FBF responses to the endothelium-dependent vasodilating agent ACh, but it is likely that both endothelium and LVM are damaged by hypertension.  (+info)

Objective pulmonary function (PF) evaluation is essential for the diagnosis, monitoring, and management of many pediatric respiratory diseases as seen in the emergency room, intensive care, and outpatient settings. In this paper, the development and testing of a new noninvasive PF instrument, pneuRIPTM, which utilizes respiratory inductance plethysmography (RIP) are discussed. The pneuRIPTM hardware includes a small circuit board that connects to the RIP bands and measures and wirelessly transmits the band inductance data to any designated wirelessly connected tablet. The software provides indices of respiratory work presented instantaneously in a user-friendly graphical user interface on the tablet. The system was tested with ten normal children and compared with an existing system, Respitrace (Sensormedics, Yorba Linda, CA), under normal and loaded breathing conditions. Under normal breathing, the percentage differences between the two systems were 2.9% for labored breathing index (LBI), 31.8% ...
Respiratory inductance plethysmography (RIP) is a method of evaluating pulmonary ventilation by measuring the movement of the chest and abdominal wall. Accurate measurement of pulmonary ventilation or breathing often requires the use of devices such as masks or mouthpieces coupled to the airway opening. These devices are often both encumbering and invasive, and thus ill suited for continuous or ambulatory measurements. As an alternative RIP devices that sense respiratory excursions at the body surface can be used to measure pulmonary ventilation. According to a paper by Konno and Mead the chest can be looked upon as a system of two compartments with only one degree of freedom each. Therefore, any volume change of the abdomen must be equal and opposite to that of the rib cage. The paper suggests that the volume change is close to being linearly related to changes in antero-posterior (front to back of body) diameter. When a known air volume is inhaled and measured with a spirometer, a ...
Pleth Variability Index (PVi) - Pleth Variability Index is an automatic measure of the dynamic change in Pi that occurs during the respiratory cycle
Body Fat Measurement Market By Product (Bioimpedance Analyzers, Body Fat Skinfold Calipers, Air Displacement Plethysmography, Hydrostatic Weighing, Dual Emission X-ray Absorptiometry, Product Positioning) Is Expected To Reach USD 640.3 Million By 2020
OBJECTIVE: To investigate the effects of different positive end expiratory pressures (PEEP) on functional hemodynamic parameters in patients lying in prone position during operation under general anesthesia.. METHODS: Totally 60 patients undergoing cervical vertebra operation or lumbar vertebra operation were studied. All patients were also monitored with Vigileo/FloTrac system. The functional hemodynamic parameters including stroke volume variation (SVV), pulse pressure variation (PPV), and pleth variability index (PVI) under PEEP levels of 0 mmHg, 5 mmHg, 10 mmHg, and 15 mmHg were recorded before and after volume expansion (hydroxyethyl starch 6%,7 ml/kg). Fluid responsiveness was defined as an increase in stroke volume index (SVI) ≥ 15%(△SVI ≥ 15%). Responders were defined as patients demonstrating an increase in SVI ≥ 15% after intravascular volume expansion and non-responders as patients whose SVI changed ,15%. Receiver operating characteristic (ROC) curves were generated for SVV, ...
With air-displacement plethysmography, the volume of an object is measured indirectly by determining the volume of air it displaces inside an enclosed chamber (plethysmograph). Thus, human body volume is measured when a subject sits inside the chamber and displaces a volume of air equal to his or her body volume. Body volume is calculated indirectly by subtracting the volume of air remaining inside the chamber when the subject is inside from the volume of air in the chamber when it is empty. The volume of air inside the chamber is calculated by slightly changing the size of the chamber (e.g. by moving a diaphragm in one of the walls) and applying relevant physical gas laws to determine the total volume from the changing air pressure within the chamber as its size is altered. Boyles law states that at a constant temperature, volume (V) and pressure (P) are inversely related. Therefore, when a constant temperature is maintained (isothermal conditions), Boyles law can be applied. Consequently, ...
A polysomnogram will typically record a minimum of 12 channels requiring a minimum of 22 wire attachments to the patient. These channels vary in every lab and may be adapted to meet the doctors requests. There is a minimum of three channels for the EEG, one or two measure airflow, one or two are for chin muscle tone, one or more for leg movements, two for eye movements (EOG), one or two for heart rate and rhythm, one for oxygen saturation, and one each for the belts, which measure chest wall movement and upper abdominal wall movement. The movement of the belts is typically measured with piezoelectric sensors or respiratory inductance plethysmography. This movement is equated to effort and produces a low-frequency sinusoidal waveform as the patient inhales and exhales. Because movement is equated to effort, this system of measurement can produce false negatives. It is possible, especially during obstructive apneas, for effort to be made without measurable movement. Wires for each channel of ...
Su Z, Oto J, Wang J, Kimball WR, Chenelle CT, Kacmarek RM, King DR, Jiang Y, Duggan MJ. Validation of Respiratory Inductance Plethysmography for Measuring Tidal Volume in Swine. Comp Med. 2015 Jun; 65(3):225-31 ...
The BioRadio has unique and powerful capabilities for capturing respiration data. It is the only wireless monitor that captures dual-band respiratory inductance plethysmography (RIP). When paired with complex analysis software, the BioRadio provides the most powerful and accurate respiration solution available.. Learn more about the BioRadio in the links at the right. Read about the advanced analysis software the BioRadio uses and how its been used in research. Want to learn more? See the BioRadio in action with a live online demo or get a demo unit to try out for yourself. Fill out the form below and well be in touch shortly. ...
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Highly qualified nutritionist specialising in nutritional assessment, weight management and sports nutritionProven research background in human body composition assessment and metabolic rate. Experitse in methodology for measuring body composition in particular air displacement plethysmography (the BodPod), MRI and BIA. Has expertise and experience of nutritional assessment having assessed over 500 people.Has acted as consultant nutritionist in commercial weight management and developing new concepts in weight lossCurrently maintaining activity as nutrition consultant whilst lecturing at University of Surrey 10 years experience of teaching nutrition at undergraduate and postgraduate level, as well as active external examiner for other universities (Greenwich, St Marys, Plymouth and Roehampton)In short, a breadth and depth of knowlege in all aspects of nutritionAmbitions to forward the frontiers of nuitrition and the application of nutritional assessment tools to a wider audience ...
RESEARCH DESIGN AND METHODS Nineteen participants (53% females) 14-20 years old with type 1 diabetes were recruited. Participant fitness was evaluated via indirect calorimetry using a maximal exercise test; body composition was measured using air displacement plethysmography. An accelerometer was worn continuously (3-5 days) and acceleration data used to estimate MVPA (minutes per day). Blood glucose values were simultaneously tracked using CGM. Controlling for sex, percent body fat (%BF), fitness, and concurrent MVPA, the likelihood of nighttime and next-day hypoglycemia due to MVPA was examined using logistic regression. ...
BACKGROUND In women with obesity, excess gestational weight gain (≥270 g/week) occurs in 2 out of 3 pregnancies and contributes to metabolic impairments in both mother and baby. To improve obstetrical care, objectively assessed information on energy balance is urgently needed. The objective of this study was to characterize determinants of gestational weight gain in women with obesity.METHODS This was a prospective, observational study of pregnant women with obesity. The primary outcome was energy intake calculated by the energy intake-balance method. Energy expenditure was measured by doubly labeled water and whole-room indirect calorimetry and body composition as a 3-compartment model by air displacement plethysmography and isotope dilution in early (13-16 weeks) and late (35-37 weeks) pregnancy.RESULTS In pregnant women with obesity (n = 54), recommended weight gain (n = 8, 15%) during the second and third trimesters was achieved when energy intake was 125 ± 52 kcal/d less than energy ...
BACKGROUND. In women with obesity, excess gestational weight gain (≥270 g/week) occurs in two out of three pregnancies and contributes to metabolic impairments in both mother and baby. To improve obstetrical care, objectively assessed information on energy balance is urgently needed. The objective of this study was to characterize determinants of gestational weight gain in women with obesity. METHODS. This was a prospective, observational study of pregnant women with obesity. The primary outcome was energy intake calculated by the energy intake-balance method. Energy expenditure was measured by doubly-labeled water and whole-room indirect calorimetry and body composition as 3-compartment model by air displacement plethysmography and isotope dilution in early (13-16 weeks) and late pregnancy (35-37 weeks). RESULTS. In pregnant women with obesity (n=54), recommended weight gain (n=8, 15%) during the second and third trimesters was achieved when energy intake was 125±52 kcal/d less than energy ...
BACKGROUND. In women with obesity, excess gestational weight gain (≥270 g/week) occurs in two out of three pregnancies and contributes to metabolic impairments in both mother and baby. To improve obstetrical care, objectively assessed information on energy balance is urgently needed. The objective of this study was to characterize determinants of gestational weight gain in women with obesity. METHODS. This was a prospective, observational study of pregnant women with obesity. The primary outcome was energy intake calculated by the energy intake-balance method. Energy expenditure was measured by doubly-labeled water and whole-room indirect calorimetry and body composition as 3-compartment model by air displacement plethysmography and isotope dilution in early (13-16 weeks) and late pregnancy (35-37 weeks). RESULTS. In pregnant women with obesity (n=54), recommended weight gain (n=8, 15%) during the second and third trimesters was achieved when energy intake was 125±52 kcal/d less than energy ...
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Thoracoabdominal asynchrony (TAA) is defined as the no coincident motion of ribcage (RC) and abdomen (AB) and considered as relevant clinically. TAA has been estimated through respiratory inductive plethysmography (RIP) and, more recently, optoelectronic plethysmography (OEP). However, the agreement of TAA measurements with both RIP and OEP remains unknown. OBJECTIVE: To compare TAA values during inspiration via OEP and RIP. METHODS: 8 healthy subjects (4 male, 34.2±8.7yrs and FEV1 91.8±7.2%pred) performed 2 cycle ergometer sessions with 30 minutes between them in a random order. TAA was evaluated in different phases of exercise, 3 minutes of each one: at rest, 40% (L40), 60% (L60) and 80% (L80) of maximal workload obtained in a previous day. TAA was calculated between RC (upper RC in OEP) and AB through phase angle using the Lissajous approach (Agostini and Mognoni, 1966). The flow at the mouth was assessed with a pneumotacograph. It was analyzed a mean cycle of 5 last breaths of every phase. ...
It has been suggested that venous congestion plethysmography (VCP) substantially underestimates microvascular permeability by activation of a veni-arteriolar constrictor mechanism, even when using small (| 25 mmHg) congestion pressure steps. We studi
Goal directed volume therapy means that bolus doses of 150-250 ml colloid fluid is administered to the patient during contemporary measurement of the patients stroke volume. The fluid status is considered optimized when stroke volume no longer increases with more than 10%, indicating that the patient is close to the top of the Frank-Starling curve. Several studies show that volume optimization reduces hospital stay and reduces the amount of surgical complications. The overall purpose is to investigate if the much more simple non invasive technique Pleth Variability Index can replace oesophageal doppler to guide volume therapy in routine health care, and to analyse if a volume kinetic test can be used to evaluate hypovolemia before surgery and make specific rehydration possible by analysing the correlation between this test and fluid optimization using stroke volume measurements.. Primary hypothesis: 1. The volume of colloids that is given to volume optimise an anesthetized patient using Pleth ...
A total of 350 questionnaires were sent to ICUs throughout Thailand. In total, 256 questionnaires were confirmed after being received at the end of June 2012. Of these, 140 filled forms (56.9%) were returned for final analysis. More than 70% of the ICUs had basic hemodynamic monitoring. Less than 10% of general and regional hospitals could perform cardiac output monitoring by thermodilution technique compared with 60% of academic teaching hospitals. New and advanced hemodynamic monitoring techniques such as pulse pressure variation, systolic pressure variation, stroke volume variation, PiCCO, Vigileo-Flo Tract, Pleth variability index device and echocardiography were available only in ICUs of academic teaching hospitals except ultrasound-based techniques including transthoracic and transesophageal echocardiography and USCOM. For respiratory monitoring, all ICUs had a SpO2 monitoring device but only one-half of them had end-tidal CO2 monitoring. Nearly 80% of ventilator support in participating ...
MilliporeSigma today announced Millistak+® HC Pro, the first portfolio of high- capacity, fully synthetic depth filters for non-treated Chinese Hamster Ovary (CHO) harvest clarification and downstream filtration applications.
In this paper is proposed a methodology to properly determine the leakage and magnetizing inductance of a single-phase high-frequency coaxial transformer. Both, leakage and magnetizing inductance equations are determined considering the transformer dimensions, the ferromagnetic characteristics, and the number of turners. Finite element methods (FEM) and a low scale prototype are also used to validate the equations. The results show that the leakage and magnetizing inductances can be precisely calculated with an error lower than 5% and 3%, respectively.
Plethysmography was found in Nursing Central. Nursing Central is an award-winning, complete mobile solution for nurses and students. Look up information on diseases, tests, and procedures; then consult the database with 5,000+ drugs or refer to 65,000+ dictionary terms.
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FTS-RC102 Bedside type, with Luer Connector. For removal of leukocytes from one single unit of whole blood, packed red cells during blood transfusion at patients bedside.. Product Features:. High leukocyte removal rate: residual WBC count ,1×106 per unit. 100%removal of micro-aggregates.. High RBC recovery rate,90%.. High biocompatibility.. No prime needed before filtration.. Specifications:. Shelf time: 2 years.. Filter membrane material: biocompatible polyester.. Sterilization: ETO gas.. Ordering Information:. FTS-RC for red cells. Bedside type. Product Code Filtration Capacity Package. FTS-RC 102 For one unit 100/case. FTS-RC 101 For half unit 100/case. FTS-RC 100 For pediatric use For pediatric use. ...
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Joseph Henry and Michael Faraday, working separately and on different continents simultaneously discovered the principle of electromagnetic inductance.
Ever wondered why your standard air displacement pipette struggles when pipetting tricky liquids? Discover how to improve your pipetting by using positive displacement pipettes, when working with liquids such as oils and blood.
Watch this video to see how the new 1536-channel pipetting head uses CyBios unique and well-proven tip sealing system. The 1536 air displacement pistons allow the simultaneous transfer and filling of all wells of a 1536-well plate in one single step.
Lecture - 36 Strain Gauge Selection This video is Module of the Strain Gauges and part of the Lecture series on Experimental Stres...
Introduction:Administration of biologic agents in AS patients is accompanied by a rapid- in the first 2 months-improvement of the clinical parameters associated with the disease itself. Thoraco-abdominal configuration is also improved in the first 3 months of treatment with antiTNFa.. Objectives:. We tested the hypothesis that long term administration of antiTNFa agents remains also beneficial to PFTs in AS.. Methods:. We performed a post-hoc analysis of 44 AS patients and we divided them into 2 similar age groups: to those without treatment and to those with at least 3 months on anti-TNF. Data from spirometry, lung volumes, and respiratory induction plethysmography were collected for further analysis.. Results:. Our results are depicted at Table 1. ...
There are 5 fifteen-letter words containing A, G, M and 2Y: EMBRYOLOGICALLY HYDROMETALLURGY HYGROMETRICALLY HYPERGLYCAEMIAS & PLETHYSMOGRAPHY. Every word on this site is valid scrabble words. Create other lists, that start with or end with letters of your choice.
Experimental stress analysis consists in using strain gauges to measure strains on the components surface. Learn the principle behind the method.
1. Day and night arterial oxygen saturation (Sao2) has been measured in forty-one patients with chronic obstructive pulmonary disease (COPD), mean FEV1 0.84 (range 0.4-1.4) litres, and with a range of daytime Sao2 values of 67-95%.. 2. The mean and biggest falls in Sao2 at night were much greater in the patients with lower daytime saturations. However, when falls in arterial oxygen tension (Pao2) were estimated from the decreases in Sao2, there was no correlation between the estimated biggest fall in Pao2 and daytime Sao2 and only a weak correlation between estimated mean fall in Pao2 and daytime Sao2.. 3. Measurement of ventilation in four hypoxaemic patients with COPD (range 60-90% Sao2) by respiratory inductance plethysmography showed that nocturnal hypoxaemic dips were accompanied by diminished ventilation, which was not always shown by nasal thermistors.. 4. Because nocturnal hypoxaemic dips are transient the ideal alveolar-arterial oxygen difference, which assumes a constant respiratory ...
Body composition in infancy may be of importance for later health. In particular, infant body composition may be relevant regarding obesity risk in childhood. Recent advances in body composition methodology using air displacement plethysmography (ADP) have provided possibilities to accurately measure body composition of infants in a quick and non-invasive manner. The aims of this thesis were to study associations of parental body composition using ADP, glucose homeostasis during pregnancy and infant genetics with infant body composition also using ADP. When using ADP in adults, a correction for the thoracic gas volume (TGV) is needed and TGV can be predicted using equations developed in nonpregnant adults. Thus another aim was to study the validity of using such equations during pregnancy.. Parent couples were invited to this study at a routine visit to a maternity clinic in Linköping between September 2008 and October 2010. When the mother was in gestational week 32, parental body composition ...
About The BOD POD. The BOD POD Body Composition Tracking System is the only device of its type that uses Air Displacement Plethysmography (ADP) to determine body fat and lean body mass in adults, children, and infants. Its non-invasive Gold Standard technology provides highly accurate body composition assessments quickly and easily. About COSMED. COSMED is the manufacturer of innovative body composition, cardio pulmonary, and metabolic assessment devices. COSMED USA, the North American subsidiary of the Italian-based parent company, COSMED srl, is located in Concord, California. Additional offices are located in China, Germany, Australia, and the UK, along with a distributor network covering more than 70 countries. ...
Analysis of body weight, height and circumferences with a tape measure allow students to compare Body Mass Index (BMI) and Waist to Hip Ratio results with other more specific measures of body composition. Field tests including the use of high quality calipers for skinfold measurement allows students to gain experience in making reliable measures of body composition. Exposure to laboratory or clinically based assessment of body composition through Dual-Energy X-Ray Absorptiometry (DXA) and Air Displacement Plethysmography are made available to keep student up to date with technological advances in body composition measurement. ...
Factors differentiating women at highest risk of progression to type 2 diabetes mellitus (T2DM) after gestational diabetes mellitus (GDM) are incompletely known. Our aim was to characterize adipose tissue and body composition in relation to glucose metabolism in women with a history of GDM and to identify factors associated with development of T2DM. We examined glucose tolerance (OGTT), insulin sensitivity (HOMA-IR), body composition (anthropometry, air displacement plethysmography), and blood chemistry in 39 women 6 years after GDM. An adipose tissue biopsy was obtained to assess the size, number, and lipolytic activity of adipocytes, and adipokine release and density of immune cells and blood vessels in adipose tissue. Normal glucose tolerance (NGT) was identified in 31 women and impaired glucose metabolism (IGM) in 8. Women with IGM had higher BMI/fat mass, and related expected adipose tissue features, than women with NGT. Ethnicity was similar in the groups, but numerically there was a ...
Looking for impedance plethysmograph? Find out information about impedance plethysmograph. An instrument for measuring changes in the size of a part of the body by measuring changes in the amount of blood in that part Explanation of impedance plethysmograph
Forearm and calf blood flow will be measured independently by venous occlusion plethysmography using mercury-in-silastic strain gauges. Plethysmographic measurements will be made at rest and following 5 minutes of ischemia (reactive hyperemia) of the distal limb (forearm and calf). Peak blood flow will be determined as the highest flow recorded during the post deflation period. Total blood flow will be measured as the area under the time-curve after resting flow is subtracted. Vascular conductance will be calculated using blood flow/mean arterial pressure (via finger plethysmograph ...
Masimo (NASDAQ: MASI) is the global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care by taking noninvasive monitoring to new sites and applications. In 1995, the company debuted Masimo SET® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. The benefits of Masimo SET® have been proven in more than 100 independent and objective studies and it is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world. In 2005, Masimo introduced rainbow® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb®), oxygen content (SpOC™), carboxyhemoglobin (SpCO®), methemoglobin (SpMet®), and Pleth Variability Index ...
Masimo (NASDAQ: MASI) is the global leader in innovative noninvasive monitoring technologies. Our mission is to improve patient outcomes and reduce the cost of care by taking noninvasive monitoring to new sites and applications. In 1995, the company debuted Masimo SET® Measure-through Motion and Low Perfusion™ pulse oximetry, which has been shown in multiple studies to significantly reduce false alarms and accurately monitor for true alarms. The benefits of Masimo SET® have been proven in more than 100 independent and objective studies and it is estimated to be used on more than 100 million patients in leading hospitals and other healthcare settings around the world. In 2005, Masimo introduced rainbow® Pulse CO-Oximetry technology, allowing noninvasive and continuous monitoring of blood constituents that previously could only be measured invasively, including total hemoglobin (SpHb®), oxygen content (SpOC™), carboxyhemoglobin (SpCO®), methemoglobin (SpMet®), and Pleth Variability Index ...
Tidal breathing patterns derived from structured light plethysmography in COPD patients compared with healthy subjects Shayan Motamedi-Fakhr,1 Rachel C Wilson,1 Richard Iles2 1PneumaCare Ltd, Ely, UK; 2Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK Purpose: Differences in tidal breathing patterns have been reported between patients with chronic obstructive pulmonary disease (COPD) and healthy individuals using traditional measurement techniques. This feasibility study examined whether structured light plethysmography (SLP) - a noncontact, light-based technique - could also detect differences in tidal breathing patterns between patients with COPD and healthy subjects. Patients and methods: A 5 min period of tidal (quiet) breathing was recorded in each patient with COPD (n=31) and each healthy subject (n=31), matched for age, body mass index, and sex. For every participant, the median and interquartile range (IQR; denoting within-subject variability) of 12 tidal breathing parameters
On the fourth day of both treatment periods, forearm blood flow (FBF) was assessed by venous occlusion strain gauge plethysmography. A time schedule of these flow assessments is provided in Figure 2. All experiments were performed in the morning after an overnight fast in a temperature-controlled room (23°C), with the subjects in a supine position. If needed, dose adjustments of hypoglycemic agents were recommended during the evening and early morning before the assessments. Capillary glucose levels were monitored. The brachial artery of the nondominant arm was cannulated with a 27-gauge needle (kindly supplied by B. Braun Medical BV, Oss, the Netherlands) for intraarterial administration of saline, acetylcholine (Miochol, Thea Pharma NV, Zoetermeer, the Netherlands), and nitroglycerine (Nitropohl, Pohl-Boskamp, Hoofddorp, the Netherlands). FBF was assessed during the successive administration of 3 increasing doses of acetylcholine (0.5, 2, and 8 μg/min per dL of forearm tissue) and ...
Breathing retraining (BR) improves symptoms, psychological well-being and quality of life in adults with asthma; but there remains uncertainty as to mechanism of effect. One of the intuitively logical theories is that BR works through altering breathing pattern. There is currently no evidence, however, that BR does result in measurable changes in breathing pattern. In this case report we describe the effects of physiotherapy BR on a 57-year-old female with a 10-year history of asthma. Data were collected before and after a physiotherapy BR program comprising three sessions over 18 weeks: breathing pattern (respiratory inductive plethysmography (RIP); physiology (end tidal carbon dioxide (ETCO2), heart rate, oxygen saturations, spirometric lung function); questionnaires (Asthma Control Questionnaire (ACQ), Hospital Anxiety and Depression Score, Nijmegen Questionnaire); and medication usage ...
The glomerular injury of preeclampsia manifests as a clinical triad, namely, hypertension, albuminuria, and a loss of intrinsic filtration capacity that lowers the GFR. Although we estimate that filtration capacity, as approximated by an ultrafiltration coefficient (Kf), is depressed by ,50% at the end of pregnancy (postpartum day 1, Table 3), this phenomenon is not widely recognized by clinicians. This is because GFR depression in clinical practice is identified by the presence of azotemia. The absence of overt azotemia (usually defined in women as serum creatinine ,1.2 mg/dl) in preeclamptic mothers during postpartum weeks 1 and 2 obscured the extent to which GFR and computed Kf were depressed in these subjects compared with healthy gravid control subjects.. We examined glomerular structure and ultrastructure in those subjects of the present report who were studied on day 1. We undertook a morphometric analysis of transmission and scanning electron photomicrographs (13). We showed that reduced ...
Circulating ATP possesses unique vasomotor properties in humans and has been hypothesized to play a role in vascular control under a variety of physiological conditions. However, the primary downstream signalling mechanisms underlying ATP-mediated vasodilatation remain unclear. The purpose of the present experiment was to determine whether ATP-mediated vasodilatation is independent of nitric oxide (NO) and prostaglandin (PG) synthesis and occurs primarily via the activation of Na+/K+-ATPase and inwardly rectifying potassium (KIR) channels in humans. In all protocols, young healthy adults were studied and forearm vascular conductance (FVC) was calculated from forearm blood flow (measured via venous occlusion plethysmography) and intra-arterial blood pressure to quantify local vasodilatation. Vasodilator responses (%ΔFVC) during intra-arterial ATP infusions were unchanged following combined inhibition of NO and PGs (n= 8; P | 0.05) whereas the responses to KCl were greater (P | 0.05). Combined infusion
Measurements In Normal Males and Response To Standing: This study included 58 subjects, age = 29 ± 9 years. Findings include: The best method for normalizing pulse volume and flow measurements to account for the physical size of the subject (i.e. that method which produced the smallest standard deviation of the measurements) is to divide pulse volume by limb segment length, thus producing a measurement in microliters per cm (equal to the average change in the cross sectional area of the measured limb).. The 95% confidence limits of right calf pulse volume (two-tailed method) is 20-54 microliters/cm. Thus there is a normal range of pulse volume measurements with which new patients may be compared.. Standing produces venous pooling that decreases cardiac output. This, in turn, produces reflex vasoconstriction. These changes are similar to those seen in impend-ing hypovolemic shock. Standing up caused a very consistent and large (33% ± 0.8%) decrease in calf pulse volume (p,0.0005).. ...
Penile plethysmography is amongst the best measures for prediction of sexual recidivism and has been extensively researched. However, there are a variety of criticisms regarding use of penile plethysmography (PPG), including financial investment, significant training needs, lack of standardization, intrusive nature of the measure, extensive time for testing, and inability to use PPG with all groups of sexual offenders (e.g., women and adolescents). Viewing time has been studied, though not as extensively as PPG, regarding detection of sexual interest. This study examined the relationship between Monarch 21 PPG and Affinity viewing time variables, including responses to individual stimuli, a sex deviance differential, and a sex deviance ratio. It was predicted that there would be a significant positive correlation between key variables of the Monarch 21 PPG and Affinity. Overall, the associations found between the Monarch 21 PPG and the Affinity were significant, although the magnitudes of the
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The behavior of the relative pulse volume in the forearm during attacks of coronary pain was examined in 10 cases.During coronary pain, the relative pulse volume in the left forearm was significantly reduced. After subsidence of pain, the relative pulse volume returned to normal. These observations seemto indicate that the pathogenesis of pain in the upper left extremity is related toreduced blood flow in this limb.
A. 箱子4 當受測者在FRC的狀態下把門關閉成為密閉3先測量吸氣前箱子的壓力P1和體積V1》在吸氣後的瞬間測量箱子的壓力3由於胸腔擴展3箱子壓力提高為P23體積減少為V1-ΔV》 P1, V1, P2皆可以測量3由公式P1*V1=P2*(V1-ΔV)可算出ΔV3也就是受測者的吸氣量》 B. 受測者肺4 當受測者在FRC的狀態下3先測量吸氣前受測者的呼吸道壓力為P3(經由含住管子測得)3而受測者的FRC=V23為欲求的未知數》吸氣後受測者呼吸道壓力會下降為P4(同樣可經由含住管子測得)3呼吸道內氣體體積增加為V2+ΔV》 P3, P4可測量3而ΔV已從上式算得3故由公式P3*V2=P4*(V2+ΔV)可算得V23也就是FRC ...
Diaphragm compressor is widely used for hydrogen compression because it achieves high gas pressure without gas contamination. Diaphragm deflecting in the cavity with high pressure formed by an oil compression is the most important component in the compressor. Therefore, it is necessary to obtain deflection degree of diaphragm to predict the damage point of diaphragm. The objective of this study is to estimate the diaphragms damage point through diaphragm deflection test by implementing with strain gauges attached on several radial points. Without gas compression, strain sum of each points varied as similarly as the variation of the pressure with respect to time. And while the motor speed was slower than 400rpm, the strain near the rim was larger than that of the center. When motor speed, however, was over 500rpm, strain became similar to that of the center and the rim. With gas compression, it was shown that the variation of the strain sum was delayed against that of the pressure and the strain ...
View Test Prep - SM_PC_chapter20 from PHY 102 at SUNY Buffalo. Chapter 20 Induced Voltages and Inductance Quick Quizzes 1. b , c , a . At each instant, the magnitude of the induced emf is
Hi, All: I am trying to calculate the mutual inductance between the coil (100 turns) and the magnet. Does anybody know any approaches that may lead a...
China Strain Gages market provides precise and clear view of applications, restraints, opportunities, investment tactics and Personalized manufacturers also carries out research in the industry size(revenue), forecast, China Strain Gages share, market outlook, trends and analysis in upcoming years.
Murata Official product details information. Here are the latest datasheet, appearance & shape, specifications, features, applications, product data of AC Line Filters PLY10AS9920R6R2B.Specifications:Common Mode Inductance(min.)=9.9mH,Nomal Mode Inductance(min.)=690μH,DC Resistance(max.)=1.7Ω,Rated Current=0.6A,Length=18mm max.,Width=16mm max.,Thickness=17.5mm max.,Operating Temperature Range=-25℃ to 60℃,Winding Temperature Rise(at Rated Current)(max.)=60℃,Rated Voltage=300Vac,Insulation Resistance(min.)=10MΩ,Withstanding Voltage=1600V(AC)(1minute) or 2000V(AC)(2second),Mass(typ.)=9.9g,Winding Mode=Standard Winding
Murata Official product details information. Here are the latest datasheet, appearance & shape, specifications, features, applications, product data of AC Line Filters PLY10AN1421R4D2B.Specifications:Common Mode Inductance(min.)=1.4mH,Nomal Mode Inductance(min.)=110μH,DC Resistance(max.)=0.43Ω,Rated Current=1.4A,Length=18mm max.,Width=16mm max.,Thickness=17.5mm max.,Operating Temperature Range=-25℃ to 60℃,Winding Temperature Rise(at Rated Current)(max.)=60℃,Rated Voltage=300Vac,Insulation Resistance(min.)=10MΩ,Withstanding Voltage=1600V(AC)(1minute) or 2000V(AC)(2second),Mass(typ.)=9.9g,Winding Mode=Sectional Winding
Three tests were conducted using penile plethysmography. While there was no difference in response when the men were exposed to ...
... can be measured using plethysmography. Analogously to Ohm's Law: R A W = Δ P V ˙ {\displaystyle R_{AW}={\frac ...
Other complementary lung functions tests include plethysmography and nitrogen washout. The most common parameters measured in ...
The impedance plethysmography allows determining changes in volume of the body tissues based on the measurement of the electric ... "Estimation of Cardiac Output by using surface electrodes for measuring the impedance plethysmography" (PDF). Navat. Gabarrón, ... "Non-invasive Cardiac Output measurement by impedance plethysmography under general anaesthesia". Eur. Soc. Anaesthesiol.: 4-6. ...
Distal plethysmography also yields useful information about circulatory status in digits. To rule out other forms of vasculitis ...
This measurement of blood flow to the male genitals is known as penile plethysmography. This is commonly measured using a ...
"Measurement of chest wall volume changes by optoelectronic plethysmography (OEP) in newborns during CPAP". re.public.polimi.it ...
The movement of the belts is typically measured with piezoelectric sensors or respiratory inductance plethysmography. This ...
Noninvasive measurement of arterial blood pressure and elastic properties using photoelectric plethysmography technique. ...
The plethysmography technique applies Boyle's law and uses measurements of volume and pressure changes to determine lung volume ...
Breathing tests (spirometry, body plethysmography) are used to measure impairment of respiratory flow through the larynx, ...
... helium dilution or body plethysmography. A lowered or elevated FRC is often an indication of some form of respiratory disease. ...
Bioelectrical impedance vs air displacement plethysmography and dual-energy X-ray absorptiometry to determine body composition ...
Freund then began plethysmography studies of male sexual orientation at the Centre for Addiction and Mental Health (then called ... Freund is best known for being the first to apply plethysmography (measurement of bloodflow) to the penis, thus permitting the ... Freund was initially commissioned to use penile plethysmography to detect recruits attempting to evade military service by ...
Whole-body air displacement plethysmography[edit]. Main article: Whole-body air displacement plethysmography ... Air-displacement plethysmography offers several advantages over established reference methods, including a quick, comfortable, ... Fields DA, Goran MI, McCrory MA (March 2002). "Body-composition assessment via air-displacement plethysmography in adults and ... Whole-body air displacement plethysmography (ADP) is a recognised and scientifically validated densitometric method to measure ...
Play media Plethysmography Electromyography Photoglottography Electrolaryngography Magnetic resonance imaging (MRI) / Real-time ...
... penile plethysmography - penitentiary - penology - perfect crime - perjury - pharmaceutical diversion - phenobarbital - ...
... an optical crystal Air displacement plethysmography, a method to determine the percentage of body fat Antidepressant Pill, a ...
... to record blood flow and pressure in circulation and introducing diagnostic materials Development of plethysmography to measure ...
... respiratory impedance plethysmography or similar resistance belts around the chest and abdomen to detect motion, an ECG lead, ...
... and venous occlusion plethysmography and ultrasonography are used to assess endothelial function of peripheral vessels in ...
... by expansion of the toe as measured with strain gauge plethysmography, or by visual assessment of color change by an ...
... plethysmography) Oculomotor and pupilometric measures Electromyographic activity Respiration Gastrointestinal activity Penile ... and vaginal plethysmography Electroencephalography Event-related potentials (ERP) Event-related frequency changes Hormonal and ...
Penile plethysmography results show that heterosexual men are preferentially attracted to adult women, with lower responses to ...
... (ADP, also known as whole-body air displacement plethysmography) is a recognized and ... Air-displacement plethysmography offers several advantages over established reference methods, including a quick, comfortable, ... The principles of plethysmography were first applied to the measurement of the body volume and composition of infants in the ... "Body-composition assessment via air-displacement plethysmography in adults and children: a review". The American Journal of ...
... (RIP) is a method of evaluating pulmonary ventilation by measuring the movement of the ... RIP is the most frequently used, established and accurate plethysmography method to estimate lung volume from respiratory ... Dual band respiratory inductance plethysmography can be used to describe various measures of complex respiratory patterns. The ... Dual band respiratory inductance plethysmography was validated in determining tidal volume during exercise and shown to be ...
"Body plethysmography - Its principles and clinical use". Respiratory Medicine. 105 (7): 959-971. doi:10.1016/j.rmed.2011.02.006 ...
The chamber can also be used for body plethysmography.. SpirometerEdit. The spirometry test is performed using a device called ...
Impedance phlebography, or impedance plethysmography (IPG), is a non-invasive medical test that measures small changes in ...
Air displacement plethysmography (ADP, also known as whole-body air displacement plethysmography) is a recognized and ... Air-displacement plethysmography offers several advantages over established reference methods, including a quick, comfortable, ... The principles of plethysmography were first applied to the measurement of the body volume and composition of infants in the ... "Body-composition assessment via air-displacement plethysmography in adults and children: a review". The American Journal of ...
Respiratory inductance plethysmography (RIP) is a method of evaluating pulmonary ventilation by measuring the movement of the ... RIP is the most frequently used, established and accurate plethysmography method to estimate lung volume from respiratory ... Dual band respiratory inductance plethysmography can be used to describe various measures of complex respiratory patterns. The ... Dual band respiratory inductance plethysmography was validated in determining tidal volume during exercise and shown to be ...
Validity of thoracic respiratory inductive plethysmography in high body mass index subjects.. Rétory Y1, David P2, de Picciotto ... We aim to evaluate thoracic respiratory inductive plethysmography (RIP) in high body mass index (BMI) subjects with a ...
It has been suggested that venous congestion plethysmography (VCP) substantially underestimates microvascular permeability by ... It has been suggested that venous congestion plethysmography (VCP) substantially underestimates microvascular permeability by ...
Air Displacement Plethysmography, Hydrostatic Weighing, Dual Emission X-ray Absorptiometry, Product Positioning) Is Expected To ... Body Fat Measurement Market By Product (Bioimpedance Analyzers, Body Fat Skinfold Calipers, Air Displacement Plethysmography, ... Body Fat Measurement Market By Product (Bioimpedance Analyzers, Body Fat Skinfold Calipers, Air Displacement Plethysmography, ...
Reliability of respiratory tidal volume estimation by means of ambulatory inductive plethysmography. Biomed Sci Instrum 2006;42 ... Body Mass Index-Dependent Ventilatory Parameters From Respiratory Inductive Plethysmography During 6-Minute Walk Test. Yann ... Accuracy of ventilatory measurement employing ambulatory inductive plethysmography during tasks of everyday life. Biol Psychol ... Validation of respiratory inductive plethysmography (LifeShirt) in obesity hypoventilation syndrome. Respir Physiol Neurobiol ...
Plethysmography was found in Nursing Central. Nursing Central is an award-winning, complete mobile solution for nurses and ...
pneuRIPTM: A Novel Respiratory Inductance Plethysmography Monitor Tariq Rahman, Ralph Page, Christopher Page, Jean-Remy ... pneuRIPTM: A Novel Respiratory Inductance Plethysmography Monitor. ASME. J. Med. Devices. 2017;11(1):011010-011010-6. doi: ... Chest Wall Motion in Preterm Infants Using Respiratory Inductive Plethysmography," Eur. Respir. J., 10(10), pp. 2295-2300. [ ... which utilizes respiratory inductance plethysmography (RIP) are discussed. The pneuRIPTM hardware includes a small circuit ...
Infant body composition by Air Displacement Plethysmography for research and clinical applications Gold Standard accuracy using ... Pediatric body composition analyzer / air displacement plethysmography PEA POD COSMED PEA POD ...
... body composition was measured using air displacement plethysmography. An accelerometer was worn continuously (3-5 days) and ...
Plethysmography is used to measure changes in volume in different parts of the body. The test may be done to check for blood ... Plethysmography is used to measure changes in volume in different parts of the body. The test may be done to check for blood ... Respiratory inductance plethysmography; Penile pulse volume recording; Pulse volume recordings; Segmental pulse volume ...
Media in category "Plethysmography". The following 3 files are in this category, out of 3 total. ... Adult body composition through air displacement plethysmography.jpg 2,872 × 2,355; 448 KB. ... Retrieved from "https://commons.wikimedia.org/w/index.php?title=Category:Plethysmography&oldid=307475212" ...
Limb plethysmography is a test that compares blood pressure in the legs and arms. ... Plethysmography may be done for very ill people who cannot travel to the arteriography lab. This test can be used to screen for ... Limb plethysmography is a test that compares blood pressure in the legs and arms. ...
Venous Plethysmography Result Heiferly I am a 33 y.o. female with generalized dysautonomia and severe gastroparesis. I have ... However, the exercise venous plethysmography revealed reduced post-exercise refill volume in my left leg, reduced ejection ... plethysmography) study was ordered and performed. Results of the venous outflow and dependent venous refilling segments were ...
PHOTO-PLETHYSMOGRAPHY; SMARTPHONE APPLICATION; SYMPATHETIC NERVE ACTIVITY ...
The use of photocell plethysmographic instruments to test for Raynauds or vibration syndrome in workers using pneumatic chisels was investigated. The hand was placed in ice water to restrict blood flow. Recovery of vascular flow to the hand being examined was measured by placing a finger in a beam of light and measuring changes in light transmission (changes in tissue transparency) with a photocel
BIOPAC data acquisition systems and amplifiers provide a range of solutions for plethysmography. Use the PPG100C Pulse ... Monitor vaginal plethysmography (TCIPPG1), penile plethysmography (TCI111/112), temperature, electrodermal activity (GSR), ... Record and analyze plethysmography data from a variety of body locations. Record pulse rate from the fingers, ears or toes for ... Hardware Packages , Plethysmography. Hardware Bundles are complete solutions for the specified application. Choose your ...
Limb plethysmography. Definition. Limb plethysmography is a test that compares blood pressure in the legs and arms. ... Plethysmography - limb. How the Test is Performed. This test may be done in the health care providers office or in a hospital ... Plethysmography may be done for very ill people who cannot travel to the arteriography lab. This test can be used to screen for ...
Pulse Oximetry and Plethysmography are non-invasive circulatory assessment methods used in blood flow monitoring, and both ... Pulse and Plethysmography. Pulse Oximetry and Plethysmography are non-invasive circulatory assessment methods used in blood ... Additional acquisition and analysis features and add-ons to support your Pulse and Plethysmography studies:. Comments and ... Explore Pulse and Plethysmography Data in LabChart Reader. LabChart Reader is a free application for conducting limited ...
The use of respiratory inductance plethysmography (RIP) for measurement of breathing is appealing not only because of its ... The use of respiratory inductance plethysmography (RIP) for measurement of breathing is appealing not only because of its ... Detection of inspiratory flow limitation during sleep by computer assisted respiratory inductive plethysmography. Eur. Respir. ... Eberhard A., Calabrese P., Baconnier P., Benchetrit G. (2001) Comparison Between the Respiratory Inductance Plethysmography ...
An investigation of response interference in penile plethysmography A well-documented problem of sex-offender assessment is ...
Other: Air-plethysmography of the neck Air-plethysmography of the neck. Other: Catheter venography of internal jugular veins ... Doppler Sonography, MR Venography, Plethysmography for the Diagnosis of CCSVI. The safety and scientific validity of this study ... This study is aimed at evaluation of diagnostic value of Doppler sonography, MR venography and air-plethysmography for the ... Positive and negative predictive value of Doppler sonography, MR venography and air-plethysmography [ Time Frame: All non- ...
Plethysmography is used to measure changes in volume in different parts of the body. The test may be done to check for blood ... Respiratory inductance plethysmography; Penile pulse volume recording; Pulse volume recordings; Segmental pulse volume ...
Impedance Plethysmography and DVT Diagnosis Gary E. Raskob, MD; Graham F. Pineo, MD; Russell D. Hull, MD ... Impedance Plethysmography and DVT Diagnosis. Ann Intern Med. 1993;119:246-247. doi: 10.7326/0003-4819-119-3-199308010-00018 ...
What is venous occlusion plethysmography? Meaning of venous occlusion plethysmography medical term. What does venous occlusion ... Looking for online definition of venous occlusion plethysmography in the Medical Dictionary? venous occlusion plethysmography ... venous occlusion plethysmography. ve·nous oc·clu·sion pleth·ys·mog·ra·phy. measurement of the rate of arterial inflow into an ... Venous occlusion plethysmography was used to assess the effectiveness of the OHT in reducing or stopping blood flow to the leg ...
Estimation of tidal ventilation in preterm and term newborn infants using electromagnetic inductance plethysmography.. Williams ... which uses electromagnetic inductive plethysmography,and compared simultaneously with pneumotachography in 43 infants either ...
... which was observed with the semi-automated plethysmography apparatus, but not a buried pellet test. In future studies, this ... Deficits in olfactory sensitivity in a mouse model of Parkinsons disease revealed by plethysmography of odor-evoked sniffing. ... To measure sniffing, we used unrestrained whole-body plethysmography to monitor respiration of the mice as they freely explored ... which was observed with the semi-automated plethysmography apparatus, but not a buried pellet test. In future studies, this ...
This feasibility study examined whether structured light plethysmography (SLP) - a noncontact, light-based technique - could ... Tidal breathing patterns derived from structured light plethysmography in COPD patients compared with healthy subjects Shayan ... Tidal breathing patterns derived from structured light plethysmography in COPD patients compared with healthy subjects. ... This feasibility study examined whether structured light plethysmography (SLP) - a noncontact, light-based technique - could ...
What is impedance plethysmography? Meaning of impedance plethysmography medical term. What does impedance plethysmography mean? ... Looking for online definition of impedance plethysmography in the Medical Dictionary? impedance plethysmography explanation ... Plethysmography. Synonym/acronym: Impedance plethysmography, PVR. Common use. To measure changes in blood vessel size or ... impedance plethysmography. Also found in: Dictionary, Acronyms, Encyclopedia.. Related to impedance plethysmography: Impedance ...
Over a 24 month period, segmental limb systolic pressures (SLP), pulse volume recordings (PVR) and bi-planar arteriograms were obtained for 202 lower extremities. The SLPs proved unsatisfactory for the localization of arterial disease and are present
Both sensors demonstrated sensitivity to changes in pulse volume (plethysmography). The electrical sensor produced a signal ... Keywords: hemoglobin; capacitance; plethysmography; noninvasive hemoglobin; capacitance; plethysmography; noninvasive This is ... Evaluation of Electrical and Optical Plethysmography Sensors for Noninvasive Monitoring of Hemoglobin Concentration Justin P. ... Phillips, J.P.; Hickey, M.; Kyriacou, P.A. Evaluation of Electrical and Optical Plethysmography Sensors for Noninvasive ...
TLC by plethysmography and HRCT both demonstrated significant inverse correlations with diffusion impairment. The absolute ... TLC was obtained by plethysmography as per American Thoracic Society/European Respiratory Society standards and by HRCT using ... Gas trapping (RV% and FRC%) independently predicted the difference in TLC between plethysmography and HRCT.Conclusion: In COPD ... Gas trapping independently predicts patients for whom TLC by plethysmography differs significantly from HRCT.Keywords: lung ...
Whole-body barometric plethysmography (WBBP) is a non-invasive method that allows safe and repeated quantitative measurements ...
The Inspired Sinewave Technique: A Comparison Study with Body Plethysmography in Healthy Volunteers Published Articles ... Finally, 18 volunteers who experienced the inspired sinewave device, body plethysmography and spirometry were asked to rate the ... To assess accuracy, sinewave measurements were compared to body plethysmography in 44 healthy volunteers. ... L for functional residual capacity when compared with body plethysmography. 14 out of 18 volunteers rated the inspired sinewave ...
The acceleration plethysmography (APG) is a useful tool to analyze the heart rate variability (HRV) with the merits of being ... STATIONARITY OF THE HEART RATE VARIABILITY BY ACCELERATION PLETHYSMOGRAPHY: SHORT-TERM MEASUREMENTS OF HEALTHY YOUNG MALES IN ...
  • Respiratory inductance plethysmography (RIP) is a method of evaluating pulmonary ventilation by measuring the movement of the chest and abdominal wall. (wikipedia.org)
  • Dual band respiratory inductance plethysmography can be used to describe various measures of complex respiratory patterns. (wikipedia.org)
  • It is the only wireless monitor that captures dual-band respiratory inductance plethysmography (RIP). (glneurotech.com)
  • Validity of thoracic respiratory inductive plethysmography in high body mass index subjects. (nih.gov)
  • We aim to evaluate thoracic respiratory inductive plethysmography (RIP) in high body mass index (BMI) subjects with a pneumotachometer (PT) as a reference. (nih.gov)
  • Air displacement plethysmography (ADP, also known as whole-body air displacement plethysmography) is a recognized and scientifically validated densitometric method to measure human body composition. (wikipedia.org)
  • Later experimental air-displacement plethysmographs developed in the 1980s were more advanced technologically, but it was only in the mid-1990s, that the first commercially available air-displacement plethysmograph was introduced for adults and early 2000 for infants With air-displacement plethysmography, the volume of an object is measured indirectly by determining the volume of air it displaces inside an enclosed chamber (plethysmograph). (wikipedia.org)
  • With air-displacement plethysmography, the volume of an object is measured indirectly by determining the volume of air it displaces inside an enclosed chamber (plethysmograph). (wikipedia.org)
  • Experitse in methodology for measuring body composition in particular air displacement plethysmography (the BodPod), MRI and BIA. (wikileaks.org)
  • RIP is the most frequently used, established and accurate plethysmography method to estimate lung volume from respiratory movements. (wikipedia.org)
  • The principles of plethysmography were first applied to the measurement of the body volume and composition of infants in the early 1900s, but it was not until the 1960s that relatively stable measurements were achieved. (wikipedia.org)
  • Raskob GE, Pineo GF, Hull RD. Impedance Plethysmography and DVT Diagnosis. (annals.org)
  • Impedance plethysmography, PVR. (thefreedictionary.com)
  • Impedance plethysmography is widely used to detect acute deep vein thrombosis (DVT) of the leg, but it can also be used in the arm, abdomen, neck, or thorax. (thefreedictionary.com)
  • Elbaum D, Wolfson P, Hedlund D, Smith CR, Braunstein D, Haspel L, Litchfield R, Sallen M, Siegel M. Noninvasive detection of thrombosis of the deep veins of the legs: comparison of Doppler ultrasonography and impedance plethysmography with venography. (jaoa.org)
  • Fibrin degradation products and impedance plethysmography. (harvard.edu)
  • Foti ME, Gurewich V. Fibrin degradation products and impedance plethysmography. (harvard.edu)
  • AIM: The aim of the study was to evaluate changes in the peripheral circulation in the calf, induced by controlled physical exercise performed within a standard rehabilitation procedure in patients with acute coronary disease, with the use of impedance plethysmography. (minervamedica.it)
  • All the patients underwent impedance plethysmography test before and after the training session in order to evaluate peripheral circulation in lower limbs. (minervamedica.it)
  • Impedance plethysmography allows for non-invasive monitoring of local blood flow and is a precise and repeated method of evaluating peripheral circulation in patients during cardiac rehabilitation. (minervamedica.it)
  • However, no such study exists for the Impedance Plethysmography (IP) signal. (vcu.edu)
  • IMSEAR at SEARO: Impedance plethysmography in arterial occlusive disease: correlation with arteriography. (who.int)
  • Air displacement plethysmography (ADP, also known as whole-body air displacement plethysmography) is a recognized and scientifically validated densitometric method to measure human body composition. (wikipedia.org)
  • Later experimental air-displacement plethysmographs developed in the 1980s were more advanced technologically, but it was only in the mid-1990s, that the first commercially available air-displacement plethysmograph was introduced for adults and early 2000 for infants With air-displacement plethysmography, the volume of an object is measured indirectly by determining the volume of air it displaces inside an enclosed chamber (plethysmograph). (wikipedia.org)
  • With air-displacement plethysmography, the volume of an object is measured indirectly by determining the volume of air it displaces inside an enclosed chamber (plethysmograph). (wikipedia.org)
  • The purpose of this study was to develop an anthropometric model to estimate neonatal fat mass (kg) using an air displacement plethysmography (PEA POD ® Infant Body Composition System) as the criterion. (biomedcentral.com)
  • Calibration of bioelectrical impedance analysis for body composition assessment in Ethiopian infants using air-displacement plethysmography. (bodystat.com)
  • Infant air-displacement plethysmography (IADP) was the criterion method, whereas weight, length, sex, age and an impedance index (L2/Z50) were predictors. (bodystat.com)
  • To compare the accuracy of air displacement plethysmography (ADP) and dual energy x-ray absorptionmetry (DXA) in tracking changes in body composition after a 16 month weight loss intervention in overweight and obese females. (biomedcentral.com)
  • One such tool has been air-displacement plethysmography (ADP), in part because of its ability to accommodate large persons but also because of its ease on both the patient and operator [ 4 - 7 ]. (biomedcentral.com)
  • It is important to recognize that air-displacement plethysmography can be a practical instrument in the evaluation of body composition in a wide range of populations. (musclemetrics.zone)
  • Therefore, based on the body of literature that has emerged, air-displacement plethysmography appears to be a suitable and reliable instrument in the assessment of body composition. (musclemetrics.zone)
  • The study team evaluated the muscle MSNA by microneurography, forearm blood flow by venous occlusion plethysmography , functional capacity by cardiopulmonary exercise test and plasmatic cathecolamine level. (thefreedictionary.com)
  • Venous occlusion plethysmography and radionuclide techniques are the most commonly used invasive methods that allow a quantitative description of local and regional blood flow (De Graaff et al. (thefreedictionary.com)
  • Venous occlusion plethysmography was used to assess the effectiveness of the OHT in reducing or stopping blood flow to the leg and arm. (thefreedictionary.com)
  • The aim of this study was to assess whether venous occlusion plethysmography can be used to identify venous obstruction and predict clinical success of stenting. (ovid.com)
  • Receiver operated characteristic curves were used to determine the ability of venous occlusion plethysmography to discriminate between the presence and absence of obstruction, measured by duplex ultrasound and magnetic resonance venography, and to discriminate between successful and non-successful stenting, measured by VEINES-QOL/Sym. (ovid.com)
  • Venous occlusion plethysmography cannot be used to identify venous obstruction proximal to the femoral confluence or to distinguish which patients will benefit from treatment. (ovid.com)
  • The AI6 Arterial Inflow System is an integrated system that will perform venous occlusion plethysmography just the way you want it. (ophthalmologymanagement.com)
  • The common techniques used to asse ss cutaneous microvascular function in vivo include capillaroscopy, venous occlusion plethysmography, and laser-Doppler instruments (laser-Doppler fluximetry and laser-Doppler imaging). (iospress.com)
  • and then to compare the technique with the "gold standard" of forearm venous occlusion plethysmography. (ahajournals.org)
  • Methods: Leg blood flow measured by venous occlusion plethysmography was compared with skeletal muscle blood flow by ultrafast computed tomography. (elsevier.com)
  • 62/556,260 filed September 08, 2017, titled "Low NOISE FRONT-END FOR A HEART RATE MONITOR USING PHOTO-PLETHYSMOGRAPHY," and is incorporated by reference in its entirety. (wipo.int)
  • The EC6 provides researchers with the ability to build to suit the instrumentation they need for using either strain gauge or photo plethysmography for arterial inflow, venous testing and a wide variety of measurement applications. (hokansonvascular.com)
  • The aim of this study was to establish novel photo-plethysmography (PPG)-based ABI assessments in an epidemiologic context and to compare its results with those of Doppler. (biomedcentral.com)
  • Reference : Whole body barometric plethysmography measurements in dogs with brachycephalic airway. (ac.be)
  • Objectives: This study used whole-body barometric plethysmography to characterize change(s) in respiratory physiology of C57BL/6 mice following bleomycin administration. (monash.edu)
  • This review evaluates the clinical usefulness of measuring chest wall kinematics by optoelectronic plethysmography [OEP]. (scienceopen.com)
  • We measured thoracoabdominal chest wall, upper and lower rib-cage, and abdominal volumes with optoelectronic plethysmography, and the muscle activity of the sternocleidomastoid and superior and inferior intercostal muscles with electromyography. (rcjournal.com)
  • Recently, optoelectronic plethysmography was developed to analyze chest wall kinematics, using a 3-compartment analysis that measures pulmonary volume and thoracoabdominal synchrony, and makes it possible to evaluate the subject in any position with the simultaneous analysis of respiratory muscle activity by using surface electromyography (EMG). (rcjournal.com)
  • The principles of plethysmography were first applied to the measurement of the body volume and composition of infants in the early 1900s, but it was not until the 1960s that relatively stable measurements were achieved. (wikipedia.org)
  • Plethysmography is the measurement of lung volume. (chp.edu)
  • The aim of the study was to evaluate the relevance of work of breathing measured by body plethysmography in obese subjects and to compare the results with those of healthy controls and patients with pulmonary diseases of different pulmonary mechanics. (omicsonline.org)
  • The term "lung volume" usually refers to the volume of gas within the lungs, as measured by body plethysmography, gas dilution or washout. (ersjournals.com)
  • The AI6 is the ideal arterial inflow system for researchers who want a completely automated system with everything needed to perform the most advanced strain gauge plethysmography testing available today. (hokansonvascular.com)
  • For additional correlation with standard methods, the same protocol was repeated, and forearm blood flow was measured by strain gauge plethysmography. (ahajournals.org)
  • We compared BOLD SI changes with changes in blood flow determined by strain gauge plethysmography (SGP). (ahajournals.org)
  • Piirila P, Smith HJ, Hodgson U, Sovijärvi AR (2016) Work of Breathing in Obesity Assessed with Body Plethysmography Comparison with Emphysematic COPD and Pulmonary Fibrosis. (omicsonline.org)
  • Body plethysmography is a pulmonary function test that determines how much air is in your lungs after you take in a deep breath. (childrenssleeplab.com)
  • To assess accuracy, sinewave measurements were compared to body plethysmography in 44 healthy volunteers. (embs.org)
  • Comparative measurements of the mucosal blood flow in the human maxillary sinus by plethysmography and by xenon. (semanticscholar.org)
  • Plethysmography and ultrafast computed tomography measurements were performed at rest and during hyperaemic flow induced by symptom limited bicycle exercise followed by five minutes of leg ischaemia. (elsevier.com)
  • Plethysmography is a noninvasive diagnostic manometric study used to measure changes in the size of blood vessels by determining volume changes in the blood vessels of the eye, extremities, and neck or to measure gas volume changes in the lungs. (thefreedictionary.com)
  • These noninvasive tests-spirometry, the lung diffusion test, and lung plethysmography-are used to help diagnose lung diseases like COPD, as well as to determine how treatment is working and if such a condition is progressing. (verywellhealth.com)
  • Finally, 18 volunteers who experienced the inspired sinewave device, body plethysmography and spirometry were asked to rate the comfort of each technique on a scale of 1-10. (embs.org)
  • We report preliminary findings from a technique referred to as remote pressure sensor respiratory plethysmography. (elsevier.com)
  • Twenty-seven children undergoing sedation were monitored with remote pressure sensor respiratory plethysmography, in addition to SPO 2 and PetCO 2 . (elsevier.com)
  • While 11% of patients did not tolerate the capnometric probe and readings were discontinuous in 26%, all of them tolerated remote pressure sensor respiratory plethysmography belts. (elsevier.com)
  • Sighs and non-respiratory movements of the torso could be distinguished on remote pressure sensor respiratory plethysmography waveforms. (elsevier.com)
  • Caldiroli, D & Minati, L 2007, ' Early experience with remote pressure sensor respiratory plethysmography monitoring sedation in the MR scanner ', European Journal of Anaesthesiology , vol. 24, no. 9, pp. 761-769. (elsevier.com)
  • With the aid of plethysmography is measured how much air a person has in his lungs after maximal inhalation and how much air is left after maximal exhalation. (firsthealthguide.com)
  • Lung plethysmography measures how much air is in your lungs after you take a deep breath and how much air is left in your lungs after you breathe out as much as you can. (cancer.ca)
  • These include the following: body plethysmography (using various methodologies), nitrogen washout, gas dilution, and radiographic imaging methods. (ersjournals.com)
  • TLC was obtained by plethysmography as per American Thoracic Society/European Respiratory Society standards and by HRCT using custom software on 0.75 and 5 mm thick contiguous slices performed at full inspiration (TLC). (dovepress.com)
  • Objectives: Body plethysmography is a lung function testing method usually applied for determination of thoracic gas volume and airways resistance, but option to measure work of breathing is available in most models. (omicsonline.org)
  • MCh) using unrestrained whole-body plethysmography and assess the ability of the immune system to mount an acquired Type I allergic hypersensitivity immune response (allergic airway disease). (mousephenotype.org)
  • For these reasons, there are situations in which many investigators choose to use the more traditional method of tail‐cuff plethysmography to either establish the blood pressure phenotype of a strain of mice or to assess the effects on blood pressure of an experimental intervention. (ahajournals.org)
  • To characterize and compare total lung capacity (TLC) measured by plethysmography with high-resolution computed tomography (HRCT), and to identify variables that predict the difference between the two modalities. (dovepress.com)
  • Plethysmography may be done for very ill people who cannot travel to the arteriography lab. (medlineplus.gov)
  • RIP is the most frequently used, established and accurate plethysmography method to estimate lung volume from respiratory movements. (wikipedia.org)
  • Plethysmography is used to measure changes in volume in different parts of the body. (medlineplus.gov)
  • Both sensors demonstrated sensitivity to changes in pulse volume (plethysmography). (mdpi.com)
  • Plethysmography is measuring the volume or the volume change of organs, limbs or the entire body. (firsthealthguide.com)
  • The Body Plethysmography, technique, also called "body box", is increasingly used in clinical practice because of better-controlled circumstances and the possibility to measure a greater number of more sensitive dynamic lung volumes than only FEV1 or vital capacity, but also parameters as Residual Volume (RV), oscillometry, Diffusion Capacity for carbon monoxide (DLCO) and Airway Resistance. (sgs.com)
  • Since this term is too nonspecific, it is recommended that its use should be discontinued and replaced with more specific terminology, for example, plethysmographic lung volume (abbreviated at V L,pleth ), and FRC by body plethysmography or TGV at FRC (FRC pleth ). (ersjournals.com)
  • In these studies, the parameters of respiratory rate, tidal volume, and minute volume were measured using whole-body plethysmography in rats administered GHB. (aspetjournals.org)
  • At all-time points, females injected with fibrils exhibited reduced odor detection sensitivity, which was observed with the semi-automated plethysmography apparatus, but not a buried pellet test. (nature.com)
  • In antiviral studies, the use of plethysmography resulted in the detection of a clear and rapid treatment response, which was similar to other non-invasive parameters, such as weight change. (usu.edu)
  • This feasibility study examined whether structured light plethysmography (SLP) - a noncontact, light-based technique - could also detect differences in tidal breathing patterns between patients with COPD and healthy subjects. (dovepress.com)
  • In COPD, TLC by plethysmography can be up to 2 L greater than inspiratory HRCT. (dovepress.com)
  • Due to its sensitivity, the plethysmography system provides accurate data that can further be used for other studies such as those concerning cardiac oscillations. (advanceseng.com)
  • Does Tail‐Cuff Plethysmography Provide a Reliable Estimate of Central Blood Pressure in Mice? (ahajournals.org)
  • The PO2-100U Pulse Oximeter and Plethysmograph Sensor measures blood oxygen saturation (SpO2) and pulse pressure (plethysmography) using a non-invasive, dual-wavelength light transmittance based finger clip. (ophthalmologymanagement.com)
  • The term 'plethysmography' is derived from the Latin word plethora (full-bloodedness, blood overload) and the Greek word graphein (writing, drawing). (firsthealthguide.com)
  • Plethysmography is a technique for measuring lung function that includes invasive and non-invasive methodologies. (monash.edu)
  • Conclusions: We have demonstrated that plethysmography can be a primary indicator of the development of respiratory disease in the mouse and would thus be suitable in assessing potential therapies since any truly effective treatment should elicit restoration of respiratory parameters in addition to improving traditional biochemical and histological indices of lung function. (monash.edu)
  • Plethysmography is used to evaluate symptoms of the upper respiratory tract, such as pain or discomfort during breathing, shortness of breath or the feeling of not getting enough air. (firsthealthguide.com)