The most authoritative answer in 2024
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Charlotte Thompson——Studied at Princeton University, Lives in Princeton, NJ
As a medical professional with expertise in cardiology, I can explain that the P wave in an electrocardiogram (EKG) is a crucial part of the heart's electrical activity that is recorded on the EKG. The P wave represents the atrial depolarization, which is the initial electrical signal that causes the atria (the upper chambers of the heart) to contract and push blood into the ventricles (the lower chambers). In a normal EKG, the P wave precedes the QRS complex, which represents the ventricular depolarization. The P wave typically appears as a small bump upwards from the baseline, and its amplitude is normally within the range of 0.05 to 0.25 millivolts (mV), which can be visualized as 0.5 to 2.5 small boxes on the EKG graph. read more >> -
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Carter Davis——Works at the International Seabed Authority, Lives in Kingston, Jamaica.
The P wave represents atrial depolarization. In a normal EKG, the P-wave precedes the QRS complex. It looks like a small bump upwards from the baseline. The amplitude is normally 0.05 to 0.25mV (0.5 to 2.5 small boxes).read more >>
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