title: Effect of amyl nitrite inhalation on the abnormal T loop of vectorcardiogram.
abstract: The effect of amyl nitrite (AN) on the vectorcardiographic T loop was studied in 17 cases who had negative T waves in the left chest leads of ECG. Thirty sec after AN inhalation the maximum T vector was displaced to the left and anteriorly in 15 and to the left and posteriorly in 2 cases. The magnitude of maximum spatial T vector was decreased and the spatial T loop became more circular. Changes in the amplitude of T loop projected to the scalar lead X were closely related with changes in the heart rate which would represent the sympathetic tone.
mesh_terms: D000328:Adult; D000368:Aged; D000680:Amyl Nitrite / Q000008:administration & dosage*; D001794:Blood Pressure / Q000187:drug effects; D006327:Heart Block / Q000503:physiopathology; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D013268:Stimulation, Chemical; D014672:Vectorcardiography
chemical_list: D000680:Amyl Nitrite