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. 2014 Sep 16;14(9):17212–17234. doi: 10.3390/s140917212

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© 2014 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 4. — Heart rate prototype: (a) the photoplethysmographic sensor located on the patient's finger and (b) an example of an ECG curve showing how to identify the R wave and the N-N interval.