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Heart rate

Heart rate is a term used to describe the frequency of the cardiac cycle.

It is considered one of the four vital signs.

Usually it is calculated as the number of contractions (heart beats) of the heart in one minute and expressed as "beats per minute" (bpm).

See "Heart" for information on embryofetal heart rates.

Note: This article excerpts material from the Wikipedia article "Heart rate", which is released under the GNU Free Documentation License.

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