I'm not sure why sitting vs lying positions make such a difference in your premature beats, but it's known that cardiac output is greater when lying flat. We don't know if you're experiencing atrial or ventricular premature beats& I recommend finding out by having an EKG& wearing an outpatient cardiac monitor for 48 hours and/or undergoing a treadmill stress test & observe for arrhythmias.
Answered 3/31/2023
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Best to get checked out by a cardiologist
Answered 4/3/2023
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