You're good!: You're a very good observer! you describe a rhythm called "quadrigeminy." every 4th beat is premature. Because the heart doesn't like irregularity, it pauses a few extra milliseconds to jump back into the original rhythm. During that brief pause, the chambers fill more and prouduce a more powerful next beat called "post-extrasystolic potentiation." none of this is dangerous.
Answered 9/8/2020
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See your doctor: As soon as possible, to find the cause and to treat you. You r irregular heart beat , most likely PVC s , ( pre mature ventricular contractions ) if untreated may lead to serious cardiac arrhythmia, for get about heart working twice as hard. Slow heart rate of athletes , allows ventricle to fill more blood, to give more ejection volume (starling principle ).
Answered 4/25/2019
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