Thirteen episodes of concealed junctional ectopic impulses (JEI) in ten patients are described. In nine patients the JEI manifested as isolated automatic impulses and in one as a parasystolic junctional tachycardia. In addition to the previously described unexpected prolongation of the P R, Type I and Type II A V block, the following phenomena were recorded: 1) marked, greater than 400 msec, and persistent prolongation of the P R interval, 2) striking changes in the duration of the P R with an occasional sequence of R P and P R intervals simulating 'supernormal' A V conduction, 3) unexpected variation of the junctional escape interval explained by junctional parasystole with entrance block, 4) postponed compensatory pause, 5) concealed junctional discharge with reciprocation.
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine
- Physiology (medical)