Using the Minnesota Code, we analysed ECGs of 58 subjects with smooth adaptation to high altitude (3.600 m) and of 70 patients with acute mountain sickness. In both groups, the 30-day sojourn at high altitude was characterized by ECG signs of the right heart overload; these signs were more marked in patients with acute mountain sickness. It was demonstrated that baseline ECGs (recorded before the ascent) of subjects predisposed to the development of acute mountain sickness showed a higher incidence of right-ventricular hypertrophy, right-atrial hypertrophy, and tachycardia. These ECG features can be used in the prognosis of acute mountain sickness.
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