QUANTITATIVE APEXCARDIOGRAPHIC INDEX“(PEAK DA/DT)/A”― Experimental and clinical studies ―
We evaluated the efficacy and the limitation of the apexcardiographic index “(peak dA/dt)A” by animal and clinical observations and obtained the following results. 1. Since significant correlations were obtained between (peak dA/dt/A and Vmax (r=+0.83), dp/dt/p (p=50mmHg) (r= + 0,85), it was suggested that this parameter might be useful for the assessment of left ventricular contractility. 2. While this parameter appeared to be affected by afterload, it would be hardly affected by preload. 3. The normal value was 23 ±4 sec-1. It was not influenced by heart rate, but by the posture at recording of the apexcardiogram. 4. In clinical observations, it was also postulated that this parameter might be an useful index to evaluate cardiac status and severity.