Key result
Ballistocardiographic H waves consistently follow the P wave even without ventricular systole.
Observational
The study provides physiological insights into the origins of the G and H waves on the ballistocardiogram, suggesting roles for auricular systole, apex thrust, and venous pressure pulses.
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Atrial systole generates distinct ballistocardiographic waves independent of ventricular contraction; leaves open its contribution to noninvasive hemodynamics.
The observations on which this analysis is based include simultaneous ballistocardiographic and electrocardiographic tracings on subjects with complete heart block, and auricular fibrillation. Deflections of the ballistocardiogram similar to the H wave were seen to occur at a constant time interval after P in the absence of a ventricular systole. However, in fibrillation H waves were also found occasionally. A G wave of the ballistocardiogram is described and the authors discuss the part played by auricular systole, the apex thrust, and venous pressure pulses in producing the G and H waves.
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Lalla et al. (1950) conducted an observational in Complete heart block and auricular fibrillation. Simultaneous ballistocardiographic and electrocardiographic tracings was evaluated on Occurrence of H wave and G wave deflections. Ballistocardiographic deflections similar to the H wave occurred at a constant time interval after the P wave in the absence of ventricular systole, and occasionally during auricular fibrillation.
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