RS-T SEGMENT, T WAVE AND HEART RATE AFTER TWO STEP AND 10 PER CENT ANOXEMIA TESTS

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Abstract
The Master "two step" test and the anoxemia test of Levy are accepted as useful objective tests in the diagnosis of coronary artery disease.1 These tests are particularly valuable in those cases in which coronary artery disease is suspected, but clinical examination and resting electrocardiogram are negative. In both procedures, the first by means of standardized exercise, the second by inhalation of a 10 per cent oxygen mixture, relative anoxemia of the myocardium is produced, which in persons with heart disease will be most frequently revealed by certain abnormal electrocardiographic findings—each test having its own criteria for an abnormal response. Since abnormal electrocardiographic changes may occur in normal persons subjected to excessive exercise,2 and negative tracings may result in persons with coronary disease if the exercise is insufficient, the exercise employed in the two step test has been standardized for age, weight and sex. The criteria for an

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