XXXX in infancy: diagnosis, clinical features, and treatment.

@entity1 @entity713 @entity591 @entity956 @entity1818 @entity65
The clinical features and treatment of @entity956 in eight @entity1 (four male and four female) less than 2 months of age are presented. @entity956 was noted during the first week of life in six of the @entity1 and between 6 and 8 weeks of life in the other two @entity1 . Four of the eight @entity1 had associated structural or functional @entity65 , and in three @entity1 a central venous pressure catheter was present in the atrium at the time @entity956 was diagnosed. Classic flutter waves were apparent on 12-lead ECGs in only two @entity1 . In six @entity1 , flutter waves were not obvious on standard ECGs, but transesophageal electrogram recordings demonstrated the presence of @entity956 with second degree @entity713 . The atrial cycle length during flutter ranged from 135 to 180 ms (mean 149 ms; mean atrial rate 403 beats per minute); there was a 2:1 ventricular response to @entity956 . Successful termination of @entity956 was accomplished using three modes of electrical cardioversion in seven of the eight @entity1 : direct current cardioversion in one, transvenous atrial pacing in one, and transesophageal atrial pacing in five. One asymptomatic @entity1 converted to normal sinus rhythm 24 hours following digoxin administration. One @entity1 had multiple @entity956 and required chronic @entity1818 therapy. In seven of the eight @entity1 , no recurrences have been noted in 6 months to 3 1/2 years of follow-up. These results demonstrate that @entity956 may be difficult to diagnose in @entity1 with @entity591 unless transesophageal electrogram recording is utilized for evaluation.(ABSTRACT TRUNCATED AT 250 WORDS)
