Supine bicycle exercise induced a significant decrease in global ejection fraction at peak exercise in coronary patients with effort angina (n=17) compared to normal subjects (n=12).
Observational (n=40)
How do left ventricular ejection fraction and hemodynamics respond to supine bicycle exercise in normal subjects versus coronary patients with and without effort angina?
Coronary patients with effort angina exhibit abnormal left ventricular functional and hemodynamic responses to exercise, highlighting the value of serial EF measurement and adequate exercise loading in diagnosing exercise-induced ischemia.
Left ventricular responses to supine bicycle ergometer exercise were studied by gated radionuclide angiocardiography (RNA), in 12 normal subjects (group A), 11 coronary patients without effort angina (group B) and 17 coronary patients with effort angina (group C). In the serial measurement of global ejection fraction (EF) there was a significant increase during peak exercise (PEx) in group A and B. In group C, global EF during mild exercise (MEx) did not increase, but decreased significantly during PEx. These results suggest the necessity of achieving adequate exercise loading in the diagnosis of exercise-induced ischemia, and also, that the serial measurement of global EF during exercise appears to be highly valuable. In the assessment of regional wall motion on the basis of regional EF, abnormal responses to exercise were highly inducible in the anteroseptal region in coronary patients with left anterior descending artery involvement. Abnormal wall motion in the other regions was less indicative for right coronary or left circumflex artery dysfunction. We examined hemodynamic responses to exercise by a Swan-Ganz catheter during RNA study in 5 patients of group A, 5 of group B, and 9 of group C. There was a large increase in left ventricular stroke work index (LVSWI) with a small rise in pulmonary capillary wedge pressure (PCWP) in group A. In group B LVSWI increased with a moderate rise in PCWP during PEx. In group C there was a negligible increase of LVSWI despite a marked rise in PCWP. A similar relationship was present between the LVSWI and the end-diastolic count (EDC) in the left ventricular region of interest. In MEx, however, the rise in PCWP in group C was more prominent than the increase in EDC. Thus, the present data indicate that the left ventricle in group C operates on a steeper portion of the diastolic pressure-volume curve than that in group A or B.
Yoshida et al. (Tue,) conducted a observational in Coronary artery disease (n=40). Supine bicycle ergometer exercise vs. Normal subjects vs. coronary patients without effort angina was evaluated on Left ventricular responses (global ejection fraction, regional wall motion, LVSWI, PCWP). Supine bicycle exercise induced a significant decrease in global ejection fraction at peak exercise in coronary patients with effort angina (n=17) compared to normal subjects (n=12).