Reliability and characteristics of XXXX in dual chamber pacemakers.

@entity1 @entity4710 @entity955 @entity1129
BACKGROUND: Although atrial high rate episodes (AHRE) have been commonly used to detect @entity4710 ( @entity1129 /AF) in pacemaker @entity1 , its reliability and characteristics are unclear. METHODS AND RESULTS: 39 @entity1 with implanted dual chamber pacemakers (mean age 79.7    6.6 years), who had no history of @entity1129 /AF and were programmed in the setting of AHRE at > 190 beats/min in DDD mode, were studied. An @entity955 ( @entity955 ) algorithm was randomly programmed "ON" in 19 and "OFF" in 20 @entity1 . AHRE were detected in 20 @entity1 (51%), consisting of @entity1129 /AF in 15 and repetitive non-reentrant ventriculoatrial synchrony (RNRVAS) in 8 @entity1 , all included in the @entity955 "ON" group. A total of 257 of 1,528 episodes of AHRE were available for analysis, including 181 and 76 episodes in the @entity955 "ON" and "OFF" groups, respectively. Among 181 episodes in the @entity955 "ON" group, 72 (40%) were RNRVAS, whereas all episodes in the @entity955 "OFF" group (100%) were @entity1129 /AF. Detection of RNRVAS was closely associated with a high cumulative % atrial pacing. The specificity of @entity1129 /AF detection by AHRE was 40% when the @entity955 algorithm was activated, vs. 100% when not in use. CONCLUSIONS: @entity1129 /AF was common in pacemaker @entity1 without a history of @entity1129 /AF. The increase in cumulative % atrial pacing and the use of an @entity955 algorithm might be closely associated with RNRVAS, non- @entity1129 /AF, detected by AHRE.
