Please click here to obtain permission to reproduce this image.
Click on image to view larger version.
Figure 3 PAC Response in AVNRT
The premature atrial complex (PAC [S2]) timed to junctional (His) refractoriness advances the next His by 30 ms. The red arrow (A) points to the local atrial activation superimposed on the His signal. The advancement of the next His by this specifically timed PAC indicates atrioventricular node re-entry tachycardia as the mechanism. The measurements in milliseconds (ms) are H-H intervals. H = His electrogram; HBED = His bundle electrogram distal; HBEP = His bundle electrogram proximal; HRA = high right atrium; RV = right ventricle.
|
