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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Concealed nonparoxysmal junctional tachycardia.

Electrophysiologic studies were performed in a patient who had an apparently uncomplicated complete trifascicular block. His bundle recordings revealed atrioventricular dissociation with: 1) an atrial rate of 58 beats/min, 2) an idioventricular escape rate of 45 beats/min, and 3) nonparoxysmal junctional tachycardia (His bundle rhythm) at a rate of 65--85 beats/min. The latter arrhythmia was electrocardiographically silent, influencing neither atrial nor ventricular events. The arrhythmia probably reflected digitalis intoxication (digoxin level of 3.3 ng/ml). A repeat electrophysiologic study 4 days after digoxin was discontinued revealed complete trifascicular block (distal to H) with intact conduction between the atrium and the His bundle (AH of 150 msec). Thus, electrophysiologic study demonstrated an electrocardiographically silent but clinically relevant arrhythmia, suggesting that His bundle recording should be part of diagnostic study during temporary pacemaker implantation in patients with atrioventricular block.[1]

References

  1. Concealed nonparoxysmal junctional tachycardia. Wyndham, C.R., Dhingra, R.C., Smith, T., Best, D., Rosen, K.M. Circulation (1979) [Pubmed]
 
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