(1) Using a pressure type transducer and direct current amplifier, the precordial low-frequency vibrocardiograms were recorded in 83 normal cases.
(2) A nomenclature was set (AU, I, EU, ED, B and Bm), based upon the cardiac cycle.
(3) Normal subjects showed 2 main types of patterns, type I and II.
(4) At the apex, type I occurred in 75 per cent and characterized by small outward movement during ejection phase (EU) and rapid systolic retraction (ED); type II occurred in 25 per cent and showed the prominent EU followed by the slow inward movement during systole and protodiastole.
(5) The apical impulse was easily palpable in most cases of type II, but not in type I. Moreover, type II was mainly seen in younger age groups, and type I increased in older age groups.
(6) Both atrial movement (AU) and mid-systolic outward movement (bulge B) were scarcely recorded in normals.
(7) At the left lower sternal border, the patterns were divided into 2 types, similar to the apex and majority showed type I except only 4 cases of younger ages.
(8) The genesis of apical beat was investigated by the apical lowfrequency vibrocardiography and clinical meaning of types was discussed.
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