His bundle recordings were performed in 2 patients in whom AV nodal bypass tracts coexisted with intermittent AV conduction disturbances occurring below the site from which the His bundle deflection was recorded. Case 1 had: (a) tachycardia dependent right bundle branch block, (b) persistent HV prolongation, and (c) bradycardia dependent AV block. Case 2 showed: (a) intra atrial conduction delay, (b) tachycardia dependent left bundle branch block with HV prolongation, (c) bradycardia dependent HV conduction disturbance, (d) tachycardia bradycardia syndrome of an unusual type; the latter presumably resulted, during atrial flutter, from the alternation of rapid AH conduction through the bypass tract with intermittent (complete) distal His bundle block or bilateral bundle branch block.
|Original language||English (US)|
|Number of pages||6|
|Journal||British heart journal|
|State||Published - Sep 5 1977|
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine