Ventilatory response to exercise in patients with left-to-right shunts.

et al., 1957; Bruce and John, 1957; Swan, Marshall, and Wood, 1958; Stephens, Shafter, and Bliss, 1964), but some uncertainty remains about the conclusions. Since any attempt to understand the disability of such patients depends on these, we have attempted a further investigation into the changes occurring during exercise. This paper deals with the hemodynamics, and a following communication is concerned with ventilatory and metabolic aspects (Gazetopoulos and Davies, 1966).