• 10 men, 6 women) were analyzed to determine the reproducibility of both acquiring and measuring myocardial velocities recorded by tissue Doppler echocardiography. (nih.gov)
  • With the use of current techniques and software, reproducibility of acquiring and measuring tissue Doppler echocardiography is suboptimal for both systolic and diastolic myocardial velocities. (nih.gov)
  • Our aim was to investigate the effect of hemodialysis related volume reduction and heart rate changes on the Doppler-derived LV MPI, and Doppler tissue imaging (DTI) derived left and right ventricular MPI. (umn.edu)
  • Left and right ventricular MPI derived from conventional pulsed-wave Doppler and DTI was calculated. (umn.edu)
  • Results: Doppler-derived LV MPI, and right ventricular MPI obtained by DTI were increased (p = 0.05) but the LV MPI obtained by DTI was unchanged after hemodialysis. (umn.edu)
  • Doppler-derived myocardial performance index (MPI) has been described as a noninvasive measurement of LV function. (umn.edu)
  • There is a significant positive correlation between the Doppler-derived LV MPI difference and volume reduction (r = 0.38, p = 0.032). (umn.edu)
  • By the multivariate analysis, there was no correlation between Doppler-derived LV MPI difference with heart rate difference, and volume reduction. (umn.edu)
  • A Novel Methodology for Rat Aortic Pulse Wave Velocity Assessment by Doppler Ultrasound: Validation against Invasive Measurements. (bioportfolio.com)
  • Tissue Doppler echocardiography (TDE) is a medical ultrasound technology, specifically a form of echocardiography that measures the velocity of the heart muscle (myocardium) through the phases of one or more heartbeats by the Doppler effect (frequency shift) of the reflected ultrasound. (wikipedia.org)
  • How is the Doppler effect and ultrasound used to diagnose illness? (hubpages.com)
  • In Doppler ultrasound the change in frequency is measured and analysed to give information about the blood flow in the body, particularly the heart. (hubpages.com)
  • If a pulse of ultrasound reflects off a stationary boundary it will return with the same frequency and wavelength as emitted. (hubpages.com)
  • Sophisticated computer software can assign colours to an ultrasound scan on the basis of its Doppler shift. (hubpages.com)
  • Doppler ultrasound is commonly used to examine liquid flow. (hubpages.com)
  • Cardiac problems are able to be detected using ultrasound techniques with the Doppler effect in mind. (hubpages.com)
  • Echocardiography is the use of ultrasound to diagnose heart problems. (hubpages.com)
  • A transducer placed on the chest walls emits a short pulse of ultrasound. (hubpages.com)
  • In Doppler echocardiography, ultrasound waves reflect off individual blood cells moving towards or away from the transducer. (hubpages.com)
  • Introduction to Adult Echocardiography Live Training Course is a (5) Five Day Echocardiography Course in St. Petersburg, FL that is taught by leading echocardiography experts and is designed to provide a strong foundation to perform and/or interpret adult cardiac ultrasound examinations. (gcus.com)
  • Utilizing automated Fourier analysis to convert returning sound waves into a series of individual frequencies, spectral Doppler refers to ultrasound modalities which yield graphical representations of flow velocity over time. (radiopaedia.org)
  • The frequency of the sound waves returned to an ultrasound transducer when interrogating blood flow represents a composite of the heterogenous Doppler shifts yielded by each red blood cell in motion, each of which is in motion at a unique velocity and direction. (radiopaedia.org)
  • Color Doppler flow mapping was developed in the early 1980's as a two dimensional extension of the basic pulsed wave Doppler ultrasound concept. (google.com)
  • Conventional pulsed wave Doppler ultrasound refers to application of this principle to measurement of velocity in a single sample volume at a desired distance away from the transducer. (google.com)
  • After these dogs have been flagged as possible sufferers of the problem, diagnosis is best achieved through simple chest X-rays (which almost always demonstrate an enlargement in the right side of the heart) and echocardiography (ultrasound of the heart) with doppler (demonstrating the flow of blood) to elucidate the abnormal change in the dimensions of the heart and the blood flow through it. (embracepetinsurance.com)
  • There is still lack of a simple, accurate and noninvasive method for rat aortic pulse wave velocity (PWV) measurement, especially the transit distance cannot be accurately measured. (bioportfolio.com)
  • Association of Estimated Pulse Wave Velocity With Survival: A Secondary Analysis of SPRINT. (bioportfolio.com)
  • Aortic stiffness, as assessed by carotid-femoral pulse wave velocity, is an independent predictor of future events in individuals with hypertension. (bioportfolio.com)
  • Pulse transit time estimation of aortic pulse wave velocity and blood pressure using machine learning and simulated training data. (bioportfolio.com)
  • Heart-Thigh Cuff Pulse Wave Velocity: A Novel Nontechnical Measure of Arterial Stiffness. (bioportfolio.com)
  • Aortic Pulse Wave Velocity in Peritoneal Dialysis Patients Is Not Simply Associated with Extracellular Water Expansion. (bioportfolio.com)
  • Pulse wave velocity (PWV) is a measurement of arterial stiffness, and previous reports linked PWV to increased extracellular water (ECW. (bioportfolio.com)
  • It is measured by pulse wave velocity. (bioportfolio.com)
  • The reference device to measure pulse wave velocity is the Sphygmocor which uses ap. (bioportfolio.com)
  • A total of 47% patients with elevated tricuspid regurgitant jet velocity and 57% without elevated tricuspid regurgitant jet velocity had screening transcranial Doppler examinations. (aappublications.org)
  • Measurement of tricuspid regurgitant jet velocity (TRV) by Doppler echocardiography can be used to estimate peak right ventricular systolic pressure with the use of the modified Bernoulli equation. (aappublications.org)
  • RESULTS Nontransgenic (Ntg) diabetic mice had reduced initial (E)-to-second (A) blood flow velocity ratio (E:A ratio) and prolonged deceleration times on Doppler echocardiography compared with nondiabetic counterparts, indicative markers of diastolic dysfunction. (diabetesjournals.org)
  • While pulsed Doppler only acquires the velocity at one point at a time, colour Doppler can acquire simultaneous pixel velocity values across the whole imaging field. (wikipedia.org)
  • Color-flow Doppler echocardiography of the valve helps determine the severity of regurgitation, but because this technique measures flow velocity rather than actual flow, it is subject to error in interpretation. (medscape.com)
  • The following Doppler-derived parameters were calculated: peak velocity of early filling (PE), peak velocity of atrial filling (PA), ratio of early wave to atrial wave peak velocity (PE/PA ratio), and deceleration time of early filling, defined as the interval between PE and the termination of early filling. (mcmaster.ca)
  • Continuous wave Doppler (CWD) simultaneously transmits and receives sound waves with separate piezoelectric crystals, recording every velocity received along a path defined by the operator. (radiopaedia.org)
  • Because stroke volume is the product of the Doppler flow velocity integral (that is, the area under the flow velocity curve) and the cross-sectional area of the vessel through which blood flows, both variables are potential sources of error. (escholarship.org)
  • Previous studies have shown that the Doppler flow velocity integral can be measured with acceptable reproducibility in the ascending aorta. (escholarship.org)
  • Doppler aortic flow velocity patterns were recorded with a 2.25 MHz M-mode echocardiographic transducer from the suprasternal notch by mapping the ascending aorta until aortic peak flow velocity was recorded. (escholarship.org)
  • Post-angioplasty, Doppler flow velocity at the anastomosis improved from 1.9 m/s to 1 m/s. (onlinejacc.org)
  • 93225-The provider performs Doppler echocardiography, a diagnostic procedure based on the Doppler effect of sound, color flow velocity mapping, a two-dimensional image representation of blood flow in the heart that shows the velocity and direction of blood flow in different colors. (aapc.com)
  • Left ventricular outflow tract velocity time integral (LVOT-VTI), a Doppler-derived measure of stroke distance, is used as a surrogate marker of cardiac function in adults. (stanford.edu)
  • Echocardiographic Pulsed Doppler showed a restrictive LV diastolic pattern suggestive of advanced diastolic dysfunction but preserved left ventricle systolic function. (scirp.org)
  • The Doppler echocardiographic technique is excellent for determining the severity of mitral regurgitation. (medscape.com)
  • Echocardiography is now a particularly attractive and established technique for MATERIALS AND METHODS evaluation and accurate diagnosis of A retrospective study of all patients various forms of cardiovascular referred for echocardiographic study at disorders. (who.int)
  • Information was echocardiography correlate well with collected from the Echocardiography those of cardiac catheterization and R e g i s t e r m a i n t a i n e d a t t h e radionuclide studies and offer prognostic echocardiographic scanning room. (who.int)
  • Despite the rapid phenomenal growth in echocardiographic study, in standard the use of echocardiography worldwide, positions. (who.int)
  • Two dimensional speckle tracking echocardiography (2D-STE) provides a more sensitive method for evaluation of global and segmental LV function than conventional two dimensional echocardiographic parameters. (scirp.org)
  • The relation between echocardiographic, Doppler-derived parameters, and 6 MW test distance was assessed by univariate linear regression analysis. (mcmaster.ca)
  • Several studies showed that this measure is a better predictor of response to rapid fluid loading than other tests such as respiratory variation in pulse pressure or echocardiographic markers. (wikipedia.org)
  • Superiority of two-dimensional measurement of aortic vessel diameter in Doppler echocardiographic estimates of left ventricular stroke volume. (escholarship.org)
  • In 19 adult patients undergoing cardiac catheterization for clinical indications, Doppler stroke volume estimates utilizing the various echocardiographic conventions for measuring aortic root diameter and area were compared with simultaneous measurements of stroke volume by the thermodilution technique. (escholarship.org)
  • One with an innocent heart murmur that is found to be otherwise normal by virtue of an echocardiographic examination which includes Doppler studies.The OFA maintains two separate and distinct cardiac databases: The Congenital Cardiac Database and the Advanced Cardiac Database . (ofa.org)
  • Two-dimensional speckle tracking echocardiography has been proposed for improving the echocardiographic quantification of left ventricular (LV) segmental and global function. (onlinejacc.org)
  • The technique is the same as for flow Doppler echocardiography measuring flow velocities. (wikipedia.org)
  • 2. Mean pulmonary artery pressure was calculated from pulsed Doppler pulmonary velocities. (portlandpress.com)
  • Spectral Doppler modalities utilize Fourier analysis (fast Fourier transformations) to average the frequencies over a circumscribed time period, usually 5 milliseconds, convert frequencies to velocities using the Doppler equation, and display a "spectrum" of these frequencies as Doppler waveforms (hence the term "spectral") 3 . (radiopaedia.org)
  • While avoiding the range ambiguity of continuous wave Doppler, the intermittent sampling of PWD, especially at targets that are further away from the transducer, renders the modality vulnerable to aliasing at higher velocities 4 . (radiopaedia.org)
  • The authors conclude that a combination of M-mode, cross-sectional and pulsed Doppler echocardiography permits a comparatively detailed non-invasive diagnosis of the entire spectrum of congenital heart diseases. (qxmd.com)
  • Pulmonary flow was measured by Doppler and cross-sectional echocardiography. (portlandpress.com)
  • Hypertrophic changes in the RV were more pronounced in the placebo group, as evidenced by greater wall thickness by echocardiography ( P = 0.008), increased cardiomyocyte cross-sectional area ( P = 0.001), and increased expression of hypertrophy-related genes, including brain natriuretic peptide, β-myosin heavy chain and myosin light chain. (physiology.org)
  • RESEARCH DESIGN AND METHODS Subjects underwent OGTT and standard echocardiography. (diabetesjournals.org)
  • Comparison of Methods of Cardiac Output Measurements Determined by Dye Dilution, Pulsed Doppler Echocardiography and Thermodilution in Horses. (nii.ac.jp)
  • Attempts to measure left ventricular stroke volume utilizing the Doppler aortic flow method have found varying correlations between invasive thermodilution and non-invasive Doppler methods. (escholarship.org)
  • Post-operatively, cardiac output was determined with the PA-TD and pulse contour methods, and the bias and limits of agreement were again calculated. (wiley.com)
  • Finally, in patients with heart rates below 60 beats/min or a cardiac index of less than 2.5 l/min/m 2 , atrial pacing was started and the haemodynamic consequences were monitored with the PA-TD and pulse contour methods. (wiley.com)
  • Post-operatively, the bias and limits of agreement between the PA-TD and pulse contour methods were 0.07 l/min and ± 2.20 l/min, respectively. (wiley.com)
  • Post-operatively, cardiac output measurements with the PA-TD and pulse contour methods did not agree, but the pulse contour method reliably tracked pacing-induced changes in cardiac output. (wiley.com)
  • Non-invasive diagnosis of a false left ventricular aneurysm by echocardiography and pulsed Doppler echocardiography. (bmj.com)
  • The authors document the importance of echocardiograhy (ECHO) with special respect to the pulsed Doppler technique (PDE) in the diagnosis of congenital heart diseases. (qxmd.com)
  • IMSEAR at SEARO: Echocardiography (M-mode, 2-D and pulsed Doppler) in diagnosis of absent pulmonary valve syndrome. (who.int)
  • Evaluation of the jugular venous pulse is perhaps one of the most misunderstood and difficult to master physical diagnosis techniques. (nih.gov)
  • Diagnosis of pulmonary hypertension by pulsed Doppler echocardiography--comparison with cardiac catheterization]. (nih.gov)
  • A 42-year-old man was addressed to the department because of dyspnoea (class II NYHA) and a recent diagnosis of dilated cardiomyopathy (LV EDD 61 mm, LVEF 38%, IVS 9 mm on Echocardiography). (escardio.org)
  • Flohr KH, Weir EK, and Chesler E. Diagnosis of aortic stenosis in older age groups using external carotid pulse recording and phonocardiography. (springer.com)
  • Doppler shifts can be in the audible range and so can be heard and an experienced operator can make a diagnosis from this sound. (hubpages.com)
  • Pulsed Doppler echocardiography in the diagnosis and estimation of severity of aortic insufficiensy. (who.int)
  • However, relying on echocardiography alone may have limitations in accurate diagnosis. (intechopen.com)
  • Reliable diagnosis using echocardiography is dependent on multiple factors like the angle of interrogation of the aortic jet, the assumption that the LVOT area is circular in cross section, optimal echo windows, the presence of underlying subclinical coronary artery disease prior to dobutamine challenge etc. (intechopen.com)
  • The diagnosis and staging of AS is primarily based on symptoms and Doppler echocardiography. (intechopen.com)
  • Two dimensional and Doppler echocardiography constitutes a safe, non-invasive, easily repeatable diagnostic examination that provide reliable and valuable information about the structure and function of the heart. (springer.com)
  • Echocardiography is the diagnostic imaging modality of choice because t can provide vivid images of the LV and the mitral valve, and it may provide clues to the mitral valve abnormalities responsible for the regurgitation. (medscape.com)
  • Moreover, the development of noninvasive diagnostic procedures such as echocardiography and radionuclide ventriculography allows accurate confirmation of clinical diagnoses by noninvasive procedures in many cases [11-17]. (springer.com)
  • Doppler echocardiography is a diagnostic procedure based on the Doppler effect of sound. (aapc.com)
  • Echocardiography is the most commonly used diagnostic tool for this purpose, and has the benefit of allowing an assessment of left ventricular diastolic function. (bcs.com)
  • An improved pulse oximeter provides for simultaneous, noninvasive oxygen status and photoplethysmograph measurements at both single and multiple sites. (freepatentsonline.com)
  • An active pulse-inducing mechanism having a scattering-limited drive generates a consistent pulsatile venous signal utilized for the venous blood measurements. (freepatentsonline.com)
  • Quantitative Doppler assessment of valvular regurgitation. (who.int)
  • The stereo pulse oximeter also measures arterial oxygen saturation and plethysmograph shape parameters across multiple sites. (freepatentsonline.com)
  • Two-dimensional and pulsed Doppler echocardiography in the postoperative evaluation of total anomalous pulmonary venous connection. (biomedsearch.com)
  • Information that can be derived from an assessment of the jugular venous pulse includes determination of the mean venous pressure, venous pulse contour, and presence and type of cardiac dysrhythmias. (nih.gov)
  • The descents or troughs ( Figure 19.1 ) of the jugular venous pulse occur between the "a" and "c" wave ("x" descent), between the "c" and "v" wave ("x" descent), and between the "v" and "a" wave ("y" descent). (nih.gov)
  • Timing of the jugular venous pulse (JVP) is displayed in relation to the carotid arterial tracing, first (S 1 ) and second (S 2 ) heart sounds, and the electrocardiogram (ECG). (nih.gov)
  • Abnormalities in the jugular venous pulse may be reflected in either the mean pressure, amplitude, or configuration of the positive waves or negative troughs, or in the sequence or absence of the positive waves. (nih.gov)
  • In this chapter emphasis is placed on measurement of the jugular venous pressure, use of the venous pulse to determine cardiac rhythm, and the more common cardiac problems of pulmonary hypertension, tricuspid regurgitation, and constrictive pericarditis. (nih.gov)
  • Once understood and practiced in a repetitive manner during each physical examination, the mysticism surrounding assessment of the jugular venous pulse disappears. (nih.gov)
  • Nevertheless, attention to a few basic points is crucial for proper examination of the venous pulse. (nih.gov)
  • First, the patient must be positioned in a manner so that the physician can observe the venous pulse. (nih.gov)
  • 3 Doppler-detected venous gas emboli (VGE) are widely used as an indicator of decompression stress in man. (bmj.com)
  • In particular, this multiple-site, multiple-parameter pulse oximeter, or "stereo pulse oximeter" simultaneously measures both arterial and venous oxygen saturation at any specific site and generates a corresponding plethysmograph waveform. (freepatentsonline.com)
  • Doppler assessment of tricuspid flow and systemic venous flow was also performed. (diva-portal.org)
  • The subjects underwent full clinical assessment, plus pathology tests, an ophthalmological and cardiological review (including electrocardiography and echocardiography) and HLA histocompatibility testing. (mja.com.au)
  • This is a placebo-controlled, double-blind, parallel, randomized, two-part, dose-confirming clinical study characterizing the pharmacodynamic effects of pulsed iNO using the combination product, inhaled nitric oxide/INOpulse DS-C vs. placebo in subjects with World Health Organization (WHO) Group 3 pulmonary hypertension (PH) associated with Chronic Obstructive Pulmonary Disease (COPD) on Long Term Oxygen Therapy (LTOT). (clinicaltrials.gov)
  • Subjects assigned to an iNO group will receive pulsed iNO at either 0.030 mg/kg IBW/hr or 0.075 mg/kg IBW/hr, with a set PW of 260 ms. Part B subjects assigned to placebo will receive N2 at a randomly assigned device setting of 0.030 mg/kg IBW/hr or 0.075 mg/kg IBW/hr with a set PW of 260 ms. (clinicaltrials.gov)
  • The systolic pulmonary arterial pressure (PAP) was measured by pulsed Doppler (systolic PAP = tricuspid regurgitation pressure gradient + estimated RA pressure). (ersjournals.com)
  • In addition, regurgitant fraction (RF) can be estimated by Doppler examination of the left subclavian artery (LSA-Doppler). (medscape.com)
  • Detailed history, examination, and laboratory tests were done, and transcranial Doppler examinations were obtained in children 2 to 14 years of age. (aappublications.org)
  • There was no correlation between elevated pulmonary artery pressures and abnormal transcranial Doppler examination in our study. (aappublications.org)
  • Echocardiography is the preferred examination. (medscape.com)
  • However, color-flow Doppler examination may not be sufficient for more exact quantification of mitral regurgitation or for determining whether the lesion is severe enough to cause LV dysfunction. (medscape.com)
  • Nexfin beat-to-beat arterial blood pressure monitoring enables continuous assessment of hemodynamic indices like cardiac index (CI), pulse pressure variation (PPV) and stroke volume variation (SVV) in the perioperative setting. (springer.com)
  • Cardiac output can be measured by arterial pulse contour analysis, echocardiography, esophageal Doppler, or contour analysis of the volume clamp-derived arterial pressure. (wikipedia.org)
  • IMSEAR at SEARO: Detection and quantification of mitral regurgitation by pulsed Doppler echocardiography. (who.int)
  • Arora R, Manoharan S, Mulloth R, Sethi KK, Khalilullah M. Detection and quantification of mitral regurgitation by pulsed Doppler echocardiography. (who.int)
  • Previous article in issue: Pulse contour analysis: should good-looking curves be trusted? (wiley.com)
  • T he estimation of cardiac output by the pulse contour method was re-introduced more than two decades ago by Wesseling et al. (wiley.com)
  • Mitral valve morphology is assessed by B-mode imaging, and color flow Doppler imaging is used to localize the origin of MR jets. (medscape.com)
  • In the past, the use of echocardiography resulted in overestimations of the prevalence of mitral valve prolapse (MVP). (medscape.com)
  • Isovolumic relaxation time was calculated as the interval between the beginning of the aortic valve closure signal and mitral valve opening signal in the Doppler spectrum. (mcmaster.ca)
  • In utero echocardiography revealed abnormal blood flow patterns at the mitral valve and reduced contractile function of Akt1 null fetuses, while ex vivo μ CT and histology unraveled structural alterations such as dilated cardiomyopathy and ventricular septum defects in these fetuses. (physiology.org)
  • The Doppler technique helps exclude mitral regurgitation and differentiate between mild and severe degrees of the condition. (medscape.com)
  • If the boundary is moving away from the transducer there will be a Doppler shift. (hubpages.com)
  • The Doppler transducer is a different one than the normal ECHO transducer. (aapc.com)
  • As the left ventricle fails, the pulse pressure narrows (the left ventricular end diastolic pressure rises to equal the diastolic blood pressure ). (wikidoc.org)
  • However, in comparison to CAT, as assessed by echocardiography, SCT may yield greater benefits to the left ventricle mechanical function as well as to the patient's aerobic fitness and physical QoL. (plos.org)
  • The presence and severity of PVR were identified by color flow Doppler. (onlinejacc.org)
  • Optimizing Doppler and color flow US: application to hepatic sonography. (radiopaedia.org)
  • As he should be documenting words like, Doppler, or color-flow study etc. (aapc.com)