| Abstrakt: |
Pulmonary arterial diastolic blood pressure (PADBP) and cardiac index (CI) were measured by thermodilution at rest and during exercise (sitting bicycle ergometry) in 24 patients. CI grew at least 2.5-fold, and PADBP was never beyond 16 mm Hg at the peak of exercise in individuals showing no signs of coronary and myocardial disorders. Similar findings were demonstrated in 6 of 9 patients with idiopathic heart rhythms disorders. In 3 patients, exercise provoked a PADBP rise above 30 mm Hg, possibly an evidence of early myocardial contractility disturbance. Six coronary patients showed these patterns of response: no abnormal changes, or a PADBP rise in the presence of normal CI, or a PADBP rise combined with declining CI. These findings are attributed to developing heart failure, an impairment of myocardial relaxation or the absence of myocardial dysfunction. |
