Fast Ventricular Tachycardia with Visible AV Dissociation

Report:

Ventricular tachycardia 214/min

AV dissociation

Comment:

The morphology is somewhat equivocal, V1 showing RR’ complexes with right rabbit ear taller than the left; nevertheless, they are essentially monophasic and over 0.14”, favouring ectopic origin rather than RBBB aberrancy. The LAD is non-contributory.

There is also some mappable dissociated atrial activity in the rhythm strip. Most likely it represents sinus P waves, but retrograde conduction subject to some kind of VA block cannot be excluded.

Over 12 hours the patient’s troponin rose to 75 µg/L (normal < 0.4), consistent with myocardial infarction seen in the next ECG (Fig 216a). The P waves are prominent enough (at least their PTF in V1) to be “seen through” the VT of the original tracing. The LAD (due to LAHB) is also present in sinus rhythm; this has no diagnostic or prognostic implications in this setting.

216a. Cautious report because there are no reciprocal changes. There are of course other reasons for this.

217. 61 year old man with recent basal infarction.

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