Alternans in human atrial monophasic action potenial.
This report describes the case of a patient with a supraventricular tachycardia with a ventricular rate of 109/min and no visible P waves in the electrocardiogram. The recording of the monophasic action potential of the right atrium disclosed an atrial tachycardia with a rate of 218/min. There was an alternans of the phase 2 of repolarisation in the action potential. This report emphasises the fact that the phenomenon of alternans occurs in man, as in the experimental animal, at a cellular level.
D000200:Action Potentials; D000368:Aged; D001281:Atrial Fibrillation / Q000503:physiopathology; D004077:Digoxin / Q000009:adverse effects; D006325:Heart Atria / Q000503:physiopathology; D006327:Heart Block / Q000139:chemically induced / Q000503:physiopathology*; D006801:Humans; D008297:Male; D013610:Tachycardia / Q000139:chemically induced / Q000503:physiopathology*
D004077:Digoxin