MiscellaneousEffect of heart rate on left ventricular diastolic transmitral flow velocity patterns assessed by Doppler echocardiography in normal subjects
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2021, Journal of Cardiovascular Magnetic ResonancePathophysiology and Echocardiographic Diagnosis of Left Ventricular Diastolic Dysfunction
2019, Journal of the American Society of EchocardiographyCitation Excerpt :When the velocity “shared” by the two waveforms, the so-called E-at-A velocity, exceeds 20 cm/sec, peak A-wave velocity increases, thus decreasing the transmitral E/A ratio (Figure 18).63 Increased A-wave velocity is caused by the larger load imposed on the atrium as a result of atrial systole interrupting rapid filling.64 The fortuitous appearance of a premature beat makes accurate measurement of the E/A ratio possible because the individual waveforms become separated (Figure 18).
Intraoperative Echocardiographic Assessment of Mitral Valve Area After Degenerative Mitral Valve Repair: A Call for Guidelines or Recommendations
2016, Journal of Cardiothoracic and Vascular AnesthesiaCitation Excerpt :For example, impaired relaxation is associated with PHT prolongation, whereas restrictive diastolic dysfunction causes PHT shortening, irrespective of MV area. With regard to the effects of hemodynamics on the PHT, the presence of a high-cardiac-output state after MV repair precipitates an increase in transmitral blood flow rate and reductions in the total diastolic period and in the PHT measurement, irrespective of the MV area.2,13,16,17,20,22,23 This effect is demonstrated in Fig 1, in which variations in cardiac output after MV repair were associated with a reduction in PHT and an increment in functional MV area measurement.
Atrial systole enhances intraventricular filling flow propagation during increasing heart rate
2016, Journal of Biomechanics