How does exercise affect right auricular pressure, pulmonary capillary pressure, and cardiac output in patients with cardiovascular disease affecting primarily the left ventricle?
Exercise induces sequential hemodynamic abnormalities starting with increased pulmonary capillary pressure, demonstrating that left ventricular dysfunction can be present even when right ventricular function is normal.
Right auricular pressure, pulmonary "capillary" pressure (a measure of left auricular pressure) and cardiac output were measured at rest and during exercise in 14 patients with cardiovascular disease affecting primarily the left ventricle. In five patients these measurements were normal at rest, in nine abnormal. In all physiologic abnormalities developed on exercise in the sequence: increased pulmonary "capillary" pressure, increased right auricular pressure, decreased cardiac output. Definite abnormalities of left ventricular function were demonstrable when right ventricular function was entirely normal. These results are discussed in relation to the clinical status of the patients.
Lewis et al. (Wed,) studied this question.