These are probably PVC's or "premature ventricular contractions."
They are the ones most likely to cause the pause you describe.
Other thing they could be is a run of a fast rhythm that doesn't allow
you to feel the pulse as easily as usual. The faster heart beat
doesn't give the heart enough time to fill between beats and so the
cardiac output/blood pressure drops for a few seconds.
Sometimes ablation doesn't really get all the foci of irritable cells.
You should see the cardiologist for a rhythm check, and a review of the
meds you are on. Stay away from all caffeine (coffee, tea, soft
drinks, chocolate, etc.) and see if that helps. You may
need to wear a Holter monitor for 24 hours to evaluate the frequency
and length of these runs.
If you are feeling dizzy with them, you should go to the ER for a
cardiogram. If you can, contact the doc this weekend, they always
have someone available through the answering service.
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