title: E1A calculating unit for the determination of the peak measured contraction velocity of the contractile elements.
abstract: An analog calculating unit is described, which is able to differentiate the left ventricular pressure and divide dP/dt by P, where P is the absolute pressure value. The parameter dP/dt/P is called the peak measured velocity (Vpm) with the dimension s(-1). The unit has an appropriate accuracy for division, three ranges and easy to handle calibration steps. The time constants for the various ranges are 40, 8 and 4 ms.
mesh_terms: D003202:Computers, Analog; D006334:Heart Function Tests / Q000295:instrumentation* / Q000379:methods; D006801:Humans; D009200:Myocardial Contraction
vernacular_title: Recheneinheit zur Bestimmung der grössten gemessenen Verkürzungsgeschwindigkeit der kontraktilen Elemente