Year: 1962
Type: article
Study design: Observational Study
Abstract: The precordial low-frequency vibrocardiograms of 82 systemic hypertensive cases were investigated and analyzed in detail comparing with the normal.(1) The patterns of tracings in hypertension were classified into two types as in the normal. However, type II was observed more frequently than type I. Both types were characterized by prominent "E" (ejection upstroke), increased "AU" (atrial upstroke) and marked "B" (midsystolic bulge).(2) The forceful apical impulse in hypertension was expressed as the prominent "E". This "E" was markedly exaggerated by cold pressor test. Therefore, the "E" was the expression of left ventricular strain in both organic and functional senses. Moreover, the sustained heaving apical impulse was caused by prominent "E" followed by marked "B" seen in cases with severe hypertension.(3) The increased "A" meant the exaggerated left atrial movement in hypertensive cases as indicated by the accentuated atrial sound in the phonocardiogram and the P-wave changes in the electrocardiogram. This change was so sensitive to deterioration or improvement of the diseased state that it was one of the most useful signs which indicated the impending or established congestive heart failure in hypertension. The cold pressor test showed an exaggeration of "AU", indicating this atrial motion was caused by abnormal ventricular filling during atrial activity, as seen in the cases of accentuated atrial sound.(4) The mid-systolic bulge (B) was recorded prominently in severe cases particularly in cases with prominent "E". This bulge was caused by left ventricular hypertrophy as well as myocardial damage, and exaggerated by cold pressor test particularly in the cases with marked cardiac impairment. This meant that the "B" was a senstiive index of myocardial insufficiency which was accompanied by this pathologic conditions.(5) In order to obtain the meanings of each movement, cold pressor test and the follow-up study were performed. The possible mechanism of each deflection and the clinical usefulness of these tracings were fully discussed based on our observations in addition to the previously reported contributions in this field. It was concluded that the precordial lowfrequency vibrocardiogram was one of the most sensitive and the useful methods in order to estimate the objective state of cardiac function and to elucidate some of the circulatory disturbances in hypertensive heart.
Source: Japanese Heart Journal
DOI: 10.1536/ihj.3.408
Institution: The University of Tokyo
Language: English
Subfield: Pulmonary and Respiratory Medicine
Field: Medicine
Domain: Health Sciences
Open Access status: bronze
OpenAlex ID: W2328362154