[Behavior of the ventricular gradient under hypoxia conditions in applicants for officer pilot training schools]

Two ECG traces were taken to measure the value and orientation of the QRS, T wave, and ventricular gradient areas in 18 applicants for places in flying officer schools subjected to hypoxia by inhalation of a poor mixture. A significant reduction was noted in the T and ventricular gradient areas, whereas there was no appreciable change in the QRS. The significance and usefulness of this form of examination is discussed, particularly with respect to subjects with abnormal ECG responses in hypoxia.