Rotating and nonrotating venous tourniquets were applied to the extremities at pressure levels of 5 to 10 mm. Hg below the diastolic blood pressure in twenty-five and twenty-three studies, respectively. This procedure resulted in only modest decreases in plasma volume and red cell mass, totaling less than 5 per cent of the total blood volume. Similar results were obtained in subjects studied during congestive heart failure (but not acute pulmonary edema) and in patients with compensated cardiac disease. The physiologic mechanism responsible for the clinical improvement noted with application of venous tourniquets in acute left ventricular failure is, therefore, uncertain. Several alternative mechanisms remain to be evaluated.
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine