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Noninvasive Assessment of the First Derivative of Left Ventricular Pressure by Apexcardiogram : 1

山口医学 Volume 34 Issue 1 Page 59-66
published_at 1985-02
Title
心尖拍動図による左室内圧一次微分値の推定について : 第一報
Noninvasive Assessment of the First Derivative of Left Ventricular Pressure by Apexcardiogram : 1
Creators Okayama Akira
Creators Ozaki Masaharu
Creators Sugihara Nobuyuki
Creators Furutani Yuji
Creators Nakashima Kazuko
Creators Hiro Junko
Creators Matsuda Yasuo
Creators Kumada Toshiaki
Creators Kusukawa Reizo
Source Identifiers
To estimate noninvasively the first derivative of left ventricular pressure (LVP-dP/dt), apexcardiogram (ACG) and the first derivative of ACG (dA/dt) were recorded in 37 pts [12 valvular heart diseases, 20 ischemic heart diseases and 5 idiopathic cardiomyopathies] within a week before cardiac catheterization. The dA/dt wave and its calibration were obtained electrically. We assumed that ACG has similar configuration with LVP and the total deflection of ACG is corresponded with the brachial peak systolic pressure (BSP) measured by cuff method. Noninvasively, peak dP/dt (=dP'/dt) was calculated with a formula as follows. Peak (+) dP'/dt=BSP・(B/A)・(a/b) mmHg/sec : the total deflection of ACG : A, peak (+) dA/dt : B, calibration factor of the A : a, calibration factor of the B : b. Mean values of peak (+) dP/dt and peak (+) dP'/dt were 1282±274 and 1245±282 mmHg/sec (mean±SD), respectively. There was little difference [37±172 mmHg/sec (mean±SD) : NS] between the two values. The peak (+) dP'/dt was significantly (Y=0.83X+178, r=0.81, p<0.001) correlated with peak (+) dp/dt. Then, we calculated the time interval from R of electrocardiogram (EKG) to peak (+) dP/dt : R-dP/dt, and the time interval from R of EKG to peak (+) dP/dt : R-dA/dt. Mean values of R-dP/dt and R-dA/dt were 65±16, 63±21 msec (mean±SD), respectively. There was no significant difference between two values and there was significant correlation (r=0.65, p<0.001). We concluded that dA/dt wave reflects well dP/dt wave in isometric contraction time and peak (+) dP'/dt can estimate well noninvasively peak (+) dP/dt of LVP.
Subjects
医学 ( Other)
Languages jpn
Resource Type journal article
Publishers 山口大学医学会
Date Issued 1985-02
File Version Not Applicable (or Unknown)
Access Rights metadata only access
Relations
[ISSN]0513-1731
[NCID]AN00243156
Schools 医学部