Supraventricular arrhythmias in neonates are rare and mostly not related to structural heart defects. We present the first case of a newborn with a supraventricular microreentrant tachycardia possibly associated with an atrial septum aneurysm and emphasize the importance of a thorough diagnostic workup allowing a fast and adequate therapy.

Paroxysmal supraventricular tachycardia (PSVT) is a serious cardiac disturbance that can arise spontaneously or be initiated by noncardiac mechanisms. An occurrence of this dysrhythmia in a 55-year-old male undergoing monitored anesthesia care for excision of a subxiphoid subcutaneous mass is reported. The unusual cause of this patient's ectopy is discussed. The nature and treatment of PSVT are...

A 48-year-old man with severe pectus excavatum presented with incapacitating supraventricular tachycardia, paroxysmal in nature and invariably provoked by exercise. During mild supine leg exercise on a bicycle ergometer an abnormal increase in right heart pressures, particularly in the right atrium, was observed, followed immediately by supraventricular tachycardia. The latter was also shown du...