CARDIAC-OUTPUT RESPONSE TO DYNAMIC EXERCISE AFTER ATRIAL SWITCH REPAIR FOR TRANSPOSITION OF THE GREAT-ARTERIES

Results from this study showed that patients who underwent successful operation for transposition of the great arteries had no appropriate i ncrease in stroke volume in response to exercise of a nature similar t o common recreational activities. The impairment, most likely due to d isturbances in both venous return and ventricular systolic function, i s compensated for by an increase in peripheral oxygen extraction; howe ver, this increase may not be adequate with maturation or during prolo nged exercise when cardiovascular constraints are more important.