Key result
Positive pressure respiration reverses ballistocardiogram respiratory variation, showing filling pressure drives amplitude shifts.
Why the study?
Variation in the size of ballistocardiogram impacts during the respiratory cycle is a consistent feature, but its cause requires investigation.
Answers are grounded in this paper and cite their sources.
Attributes BCG respiratory variation to pressure changes, not heart position; leaves open applicability to modern cardiorespiratory monitoring.
Variation in the size of the impacts during the respiratory cycle is a feature of almost every bal- listocardiogram (1).As the subject inhales, the impacts increase in size, to diminish again as he exhales; if the breath is held, this rhythmic varia- tion disappears.
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Starr et al. (1946) studied Healthy volunteers and specific cardiac/neurologic patients (n=7). Artificial positive pressure respiration vs. Normal breathing was evaluated on Respiratory variation of ballistocardiogram amplitude. Artificial positive pressure respiration reversed the normal respiratory variation of the ballistocardiogram, demonstrating that this variation is caused by changes in cardiac filling pressures rather than shifts in the heart's position.
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