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The Extravascular Basis for Respiratory Variation in the Ballistocardiogram: With Notes on the Effects of Constrictive Pericarditis, Atrial Septal Defect, and the Valsalva Maneuver

Ann Intern Med. 1962;57(3):398-405. doi:10.7326/0003-4819-57-3-398
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One of the most striking features of the ballistocardiogram recorded on the Starr table or from motion of a crosspiece laid on the shins is the decrease in systolic waves during expiration. This becomes more marked with age, especially in subjects predisposed to coronary heart disease. In some subjects it is more marked after cigarette smoking; again there is a more striking difference in patients with coronary disease than in controls of the same age. The respiratory variation is decreased, in normal persons and in coronary patients, by an elastic abdominal binder.

The generally accepted interpretation of these phenomena is


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