Abstract
1. 1. Electrocardiographic studies were carried out in 209 persons free from detectable heart disease during the performance of a standard Valsalva maneuver. 2. 2. In 22.5 per cent significant changes were observed. These most often consisted of marked lowering of the T wave and depression of the S-T segment. Other changes included extrasystoles, partial heart block, slurring of the QRS complex and T-P fusion. 3. 3. Explanation for the production of these changes are discussed and it is concluded that reduced coronary perfusion is the most likely causative factor.
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