Abstract
VENTRICULAR rates in excess of 300 beats per minute occur not infrequently during bouts of paroxysmal tachycardia in infants and young children. 1 Indeed, Silverman and Race 2 have reported a heart rate of 365 beats per minute in a 5-week-old infant. Heart rates in the vicinity of 300 beats per minute occur very rarely in persons past puberty with paroxysmal tachycardia; we have been able to find only five such cases with electrocardiographic confirmation in the literature. 3 As might be anticipated, the exact nature of a tachycardia, whether auricular, nodal, or 1: 1 atrial flutter, is difficult to ascertain by clinical or electrocardiographic means when the heart rate is extremely rapid; generally the tachycardia is labeled supraventricular (or ventricular) with little further effort or, indeed, ability to elucidate its exact nature. Prinzmetal and his associates 4 have recently presented evidence that auricular tachycardia and auricular flutter are fundamentally a result of the
Published Version
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