Atrioventricular dissociation.

Abstract

Examination of the scalar ECG usually allows accurate identification of the various types of AV block. Meticulous attention to waveform identification and careful measurement are the essentials in this as in other fields of electrocardiography. In difficult cases, or where the defect is intermittent, additional recording techniques or special manoeuvres may be necessary. Modern techniques including multichannel ambulatory monitoring, stress testing, physiological and pharmacological manoeuvres, and recording of special surface and intracardiac ECGs are occasionally necessary.