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Noninvasive Estimation of Left Ventricular Max(dP/dt) from Aortic Flow Acceleration and Pulse Wave Velocity
Author(s) -
SUGAWARA MOTOAKI,
SENDA SHOICHI,
KATAYAMA HIROSHI,
MASUGATA HISASHI,
NISHIYA TOMOHIKO,
MATSUO HIROHIDE
Publication year - 1994
Publication title -
echocardiography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 62
eISSN - 1540-8175
pISSN - 0742-2822
DOI - 10.1111/j.1540-8175.1994.tb01380.x
Subject(s) - ventricle , cardiology , medicine , regurgitation (circulation) , doppler effect , mitral regurgitation , aorta , pulse wave velocity , doppler echocardiography , aortic valve , blood flow , mitral valve , physics , blood pressure , diastole , astronomy
The Doppler method of obtaining left ventricular Max(dP/dt) proposed recently was based on the measurement of mitral regurgitation velocity. Since Max(dP/dt) is an isovolumic phase index, its use in cases of mitral regurgitation may be open to argument. However, we had proposed a noninvasive method of estimating left ventricular Max(dP/dt) based on different principles. In our method, Max(dP/dt) had been given by Max(dP/dt) = pcMax(du I dt), where p is the blood density, c is the pulse wave velocity, and u is the flow velocity in the aorta. We had derived the above equation theoretically, and confirmed its validity by animal experiments. In our previous study, we also applied our method in the clinical setting. The aortic flow velocity was measured by Doppler echocardiography, and the pulse wave velocity by mechanocardiography or Doppler echocardiography. pcMax(dufdt) obtained noninvasively was compared with Max(dP/dt) measured with a catheter‐tip micromanometer. We found an excellent correlation between pcMax(dufdt) and Max(dP I dt), and concluded that pcMax(du/dt) is useful in assessing noninvasively the contractile state of the left ventricle. Here, we summarize our method, review previous results, and report new results of the clinical application of our method.