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- W2417988203 abstract "Abstract In 5 patients with exaggerated respiratory variation in arterial blood pressure or palpable pulsus paradoxus due to various causes, measurements were made of cardiac output and arterial, right heart, and intrapericardial pressures. Respiratory patterns were altered voluntarily to prolong inspiration or produce expiratory pauses. These maneuvers allow examination of the time course of right ventricular and left ventricular output. Intrapericardial (and venous) pressures consistently fell with inspiration. No effect of pericardial tensing was apparent. A decrease in arterial pressure early in inspiration was followed by a rise with overshoot independent of subsequent respiratory activity. This is interpreted as an inspiratory rise in right ventricular output and early inspiratory drop in left ventricular output. The net effect of inspiration, however, is to increase cardiac output. The relation between pulmonary vascular compliance and the excess of right ventricular over left ventricular output dictates the time delay in transmission of augmented right ventricular output to the left ventricle. At certain respiratory frequencies, i.e., the total system natural frequency, marked oscillations of arterial pressure may be induced." @default.
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- W2417988203 date "1964-03-01" @default.
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- W2417988203 title "TIME COURSE OF FACTORS CAUSING EXAGGERATED RESPIRATORY VARIATION OF ARTERIAL BLOOD PRESSURE." @default.
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