Word: phonocardiograph
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...smothering sensation" had nothing wrong with her heart. Drs. W. Proctor Harvey and Samuel A. Levine ordered psychiatric treatment for her. Then the patient volunteered to test the effect of a drug (amyl nitrite) on heart sounds. At first the electrocardiograph gave normal readings; so did the phonocardiograph. But as soon as the patient saw the drug, her heart began a machine-gun beat. Scared nearly to death themselves, the doctors put the drug away and her heart went back to normal...
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