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In page Pulse:
"In healthy people, the pulse rate is close to the heart rate, as measured by ECG.[1] Measuring the pulse rate is therefore a convenient way to estimate the heart rate.[2] Pulse deficit is a condition in which a person has a difference between their pulse rate and heart rate. It can be observed by simultaneous palpation at the radial artery and auscultation using a stethoscope at the PMI, near the heart apex, for example. Typically, in people with pulse deficit, heart beats do not result in pulsations at the periphery, meaning the pulse rate is lower than the heart rate. Pulse deficit has been found to be significant in the context of premature ventricular contraction[citation needed] and atrial fibrillation.[3]