I usually always have a Kardiamoble ecg like the attached one before and after my heart takes off with over 100 pulse. It seems like the only answer I get from a cardiologist is "it is AFIB". I have 4 events in the attached data where something looking like the QRS happens shortly after a normal QRS, and then the same period between the short QRS until the next "normal" QRS. If I take my pulse, the "short" QRS doesn't feel as strong as a normal heart beat.

Any idea what these "short" QRS pulses are?

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kenn_green
Any idea what these "short" QRS pulses are?

Looks like premature atrial contractions (PACs) to me.

I agree with George. Those are PACs.

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kenn_green
Re: What Does This ecg Before and After "AIFB" Mean

I've always looked at PAC and PVC frequency as an indicator of how "happy" the heart is. I've used electrolytes as part of my plan to keep afib under control for 20 years. I noticed 20 years ago (and more recently), if I had high PAC's or PVC's counts in my pulse before bed, I was very likely to wake up in afib. I haven't looked at the research data since then, but I recall that many afib episodes in the data started with a PAC (doesn't mean that every PAC leads to afib, far from it).