The apex-carotis diagram (ACD) is a new mechanocardiographic, non-invasive method consisting of integration of the carotidogram and left apex-cardiogram synchronously recorded. The values of the amplitude height of these curves every 0.02 sec are transferred to an orthogonal coordinate system, and the points are then connected in chronological order, thus obtaining the ACD. In ischemic heart disease with angina pectoris, the ACD showed a decrease of the areas of ventricular filling and ventricular ejection, and an increase of the diastolic subsegment A. In 18 of the examined patients the decrease of the ventricular ejection area showed a significant negative correlation with the increase of left ventricular ejection time.