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. 2014 Mar 24;4(3):e004399. doi: 10.1136/bmjopen-2013-004399

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

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(A) Image showing a system incorporating two photoplethysmography (PPG) devices transmitting infrared light, analogue-to-digital converter and forearm pressure cuff. (B) Showing the position of cuff and two PPG devices during the test. (C and D) showing recorded pulse amplitude tracing. In the arm undergoing hyperaemia (C, top tracing; and D), baseline amplitude is recorded. During cuff inflation, flow is occluded and restores after cuff release (hyperaemic period). In the contralateral control finger (C, bottom tracing), flow continues throughout, and pulse amplitude undergoes minimal changes.