![](http://www.alamy.com/thumbs/6/E59AAD06-B5E1-44F2-A5A1-8C0E675A8D58/2EJPJ7B.jpg)
Tracing of electrocardiograms on graph paper. Records of heart activity. Heartbeat with arrhythmia. Selective focus with a portion out of focus.
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Photo credit: © Osvaldo Selva / Alamy / Afripics
License: Royalty Free
Model Released: No
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