Correlation of External Cardiac Indices with Internal Parameter of Left Ventricular Function in Hypertension and Ischemic Heart Disease

Over the past decade, many procedures have been developed for the assessment of cardiac function in man. Several workers, using intracardiac pressure and precordial movement, have studied the correlation between both techniques. The purpose of this report is to document the observation that the left ventricular component of apexcardiogram (ACG) and carotid pulse tracing formance measured by intracardiac pressure. The author have recorded simultaneous apex-cardiogram, corotid pulse tracing and left ventricular pressure curves at rest. pressure curves at rest. Materials and Methods: A total of 45 patients were studied, of whom 24 were hypertensive patients, 13 coronary heart disease and 8 miscellaneous diseases. The ages of those suffering from various heart diseases were between 16 and 61, with a median of 42. Left ventricular pressure and its first derivative dp/dt were recorded by an No. 8 Kifa catheter introduced via femoral artery. Indirect determinations were made from simultaneous recordings of phonocardiograms, carotid pulse, apexcardiogram and electrocardiogram. All data were recorded on a multichannel recorder at a paper speed of 100mm/sec with time lines indicating 10 msec. Results: 1) Correlation between a wave ratio and LVEDP. Highly significant correlations were observed between a wave ratio and LVEDP. The 4 patients with normal LVEDP (≤ 14 mmHg) had high a wave ratio ( ≥ 12%). 2) Correlations among PEP, ICT and Vpm, Vmax. A statistically significant corelation was observed between PEP and Vpm or Vmax (r=-0.419, p<0.01). The correlations of ICT with Vpm and Vmax were significantly high (r= 0.473, p<0.01 ).