Heart Blocks ECG Quiz 44 Answer

1. Junctional rhythm
2. Left bundle branch block
3. SVT with aberrancy

Not all ECG tracings are clear cut and textbook quality. This ECG is a bit vague in a couple ways. There is some baseline artifact making it difficult to see if there is truly P wave activity. There are some QRS complexes toward the beginning of the tracing where a P wave can be imagined, however these are not consistent. The rhythm is likely junctional. Then the QRS rate increases suddenly toward the end of the tracing. Note that the QRS morphology remains the same as far as we can tell. This fact alone gives the diagnosis of SVT with aberrancy and not ventricular tachycardia.

Related Topic Reviews: Junctional Rhythms, Left Bundle Branch Block, Ventricular Tachycardia