scholarly journals Influence of left ventricular relaxation on pressure half time of aortic regurgitation flow velocity spectrum

1998 ◽  
Vol 31 ◽  
pp. 246
Author(s):  
S.F. de Marchi ◽  
S. Windecker ◽  
B.C. Aeschbacher ◽  
C. Soller
Keyword(s):  
Flow Velocity ◽  
Aortic Regurgitation ◽  
Left Ventricular ◽  
Velocity Spectrum ◽  
Half Time ◽  
Left Ventricular Relaxation ◽  
Ventricular Relaxation

scholarly journals Influence of left ventricular relaxation on the pressure half time of aortic regurgitation

Heart ◽  
1999 ◽  
Vol 82 (5) ◽  
pp. 607-613 ◽  
Author(s):  
S F de Marchi ◽  
S Windecker ◽  
B C Aeschbacher ◽  
C Seiler
Keyword(s):  
Aortic Regurgitation ◽  
Left Ventricular ◽  
Half Time ◽  
Left Ventricular Relaxation ◽  
Ventricular Relaxation

scholarly journals Calculation of Left Ventricular Relaxation Time Constant-Tau in Patients With Aortic Regurgitation by Continuous-Wave Doppler

2008 ◽  
Vol 2 (1) ◽  
pp. 28-30 ◽  
Author(s):  
Bai Xufang
Keyword(s):  
Relaxation Time ◽  
Aortic Regurgitation ◽  
Time Constant ◽  
Continuous Wave ◽  
Left Ventricular ◽  
Simple Method ◽  
Relaxation Time Constant ◽  
Left Ventricular Relaxation ◽  
Ventricular Relaxation ◽  
Continuous Wave Doppler

Left ventricular relaxation time constant, Tau, is the best index to evaluate left ventricular diastolic function. The measurement is only available traditionally in catheter lab. In Echo lab, several methods of non-invasive measurement of Tau have been tried since 1992, however almost all the methods are still utilizing the same formula to calculate Tau as in catheter lab, which makes them inconvenient, time-consuming and sometimes not very accurate. A simple method to calculate Tau in patients with mitral regurgitation has been developed just based on Weiss’ formula and simplified Bernoulli’s equation. Similarly, formulas are developed here by pure mathematical derivative to calculate Tau by continuous-wave Doppler in patients with aortic regurgitation.

Differences in Transmitral Flow Velocity Pattern during Increase in Preload in Patients with Abnormal Left Ventricular Relaxation

Cardiology ◽  
1998 ◽  
Vol 89 (2) ◽  
pp. 152-158 ◽  
Author(s):  
Hirotsugu Yamada ◽  
Takashi Oki ◽  
Tomotsugu Tabata ◽  
Kazuyo Manabe ◽  
Kazuyo Fukuda ◽  
...  
Keyword(s):  
Flow Velocity ◽  
Left Ventricular ◽  
Transmitral Flow ◽  
Velocity Pattern ◽  
Left Ventricular Relaxation ◽  
Ventricular Relaxation
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