Reference Terms
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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:   The above text is excerpted from the Wikipedia article "Heart rate", which has been released under the GNU Free Documentation License.
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