Atrial pacing with 2:1 AV block
Posted by: Johnson Francis on: 18 Oct, 2009
Click on the image for an enlarged view Tracings from an electrophysiological study (EPS) with intracardiac and surface electrocardiograms showing 2:1 AV conduction during atrial pacing. The upper six channels in white colour are surface electrocadiograms (leads I, II, III, AVF, V1 and V6). The pacing spikes are sharp deflections of very short duration. The [...]
Tags: 2:1 AV block, 2:1 conduction can also occur in Mobitz type II AV block, A is blocked above the His bundle, AH, are usually numbered from distal proximal, artifact helps us to find the site of pacing, atrial pacing rate, AVF, blocked P, blocked P waves, broader signal with an amplitude lesser than that of the pacing stimulus, change the recording speed of the display in online, channel precedes that in the HIS channels, channels have been hidden in this image, conducted P waves, corresponding A wave, CS12 channel in this case shows a small pacing signal, CS12 to CS9-10 in case of decapolar electrode, CS34, CS9-10, cumulative time interval, distal His bundle electrode pair, distal pair of coronary sinus electrodes, does not show this artefact, electrodes in the coronary sinus, EP tracing, EPS, followed by H and V, from 0 to 2000 msec, H, half the paced P waves have an associated QRS complex, helps in evaluating the rhythm better, helps the operator to concentrate on the tracing important for this particular study, high amplitude ventricular signal, High Right Atrium distal channel, Higher recording speeds are used to delineate short intracardiac signal intervals, highest grade of Wenckebach type of block possible, HISd, HISd channel, HRA proximal channel, HRAd, HRAp, HV, II, III, in the channel from which the pacing stimulus is being delivered, intracardiac and surface electrocardiograms showing 2:1 AV conduction during atrial pacing, leads I, lower amplitude than in the CS12, marker at the level of the pacing stimulus, measured with online calipers, nor does any other channel, offline mode, P waves and QRS complexes are marked in lead II, PA, pacing spikes are sharp deflections of very short duration, pacing stimuli are delivered, polarisation artefact, polarization artifact, PP, presumably at the AV node, prevent cluttering of screen, recording any intra cardiac signals, recording speed is much higher for an EP study, RR, STIM channel just depicts the intervals, suggests that the pacing stimulus is being delivered from this electrode pair, supero-inferior conduction, surface electrocadiograms, The A wave in the HRAp, The intervals in the lowermost green bar, they can always be made available on the screen, Tracings from an electrophysiological study, triphasic His bundle potential, upper six channels in white colour, usually at 100 or 200 mm/sec rather than the 25 mm/sec for usual ECG tracings, V, V1, V6, various intervals, ventricular signal, Wenckebach threshold of the AV node, width of P waves and QRS complexes are more than the usual
