PAROXYSMAL TACHYCARDIA

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Abstract
Variations of the rhythm of the heart-beat occur in many pathologic conditions and are frequently seen in medical practice. In recent years a great impulse has been given to the study of these phenomena. Certain clinical types have been differentiated. Among these is a condition now generally known as paroxysmal tachycardia. At first quite widely and loosely applied to periodic attacks of rapid and irregular rhythm, it has more lately been confined to those cases of periodic tachycardia in which the heart attains a rate of 200 or more within a short time following the beginning of the attack. The clinical picture is one simply of tachycardia, it being very unusual for any irregularity of rhythm to occur. An attack of this kind is, of course, always alarming, and it is extremely important that its nature be recognized in order that suitable treatment may be instituted. The unsatisfactory accounts of this

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