Cardiac electrophysiological assessment and the natural history of unexplained XXXX .

@entity1 @entity1165 @entity944 @entity1163 @entity1817 @entity854 @entity56 @entity299
There is little data on cardiac electrophysiological assessment and long term follow-up of unexplained @entity1163 from Australasia. We present 94 @entity1 with unexplained @entity1163 who underwent such assessment and followup for an average of 52 months in 92 @entity1 . Of the 94 investigated 57 were male, the average age was 61 years and average number of @entity1163 prior to study was 8 (minimum 2). Forty-two @entity1 had @entity299 . @entity1 were divided into 3 groups on results of electro physiological testing. Normal (31 @entity1 ), group 1 with @entity1817 or atrioventricular conduction (37 @entity1 ) and group 2 in whom the abnormalities were felt likely to represent the cause of @entity1163 (26 @entity1 ). @entity854 in group 2 were @entity1817 in 12, abnormal atrioventricular nodal conduction in 8, abnormal infranodal conduction in 2, vagal @entity56 in 3 and @entity1165 in two. Follow-up for a mean of 52 months was obtained in 92 @entity1 . Recurrent @entity1163 occurred in 37% of the @entity1 . Treatment reduced recurrent @entity1163 to a level approaching statistical significance in group 2 @entity1 (50% to 13%; 0.01 greater than p greater than 0.05) but had little influence on recurrent @entity1163 in group 1 or normal @entity1 . There were 14 deaths over the follow-up period. Mortality was predicted by group 2 electrophysiological abnormality (p less than 0.02) and the presence of @entity299 (p less than 0.05) and was not reduced by specific therapy. @entity944 occurred in 3 @entity1 , all with @entity299 .(ABSTRACT TRUNCATED AT 250 WORDS)
