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Clinical manifestationsPeripheral Arterial Disease (PAD) manifests through a range of symptoms, from the characteristic intermittent claudication to atypical presentations and severe complications in advanced stages. Intermittent claudication, a hallmark symptom of PAD, presents as exercise-induced muscle pain that typically resolves within minutes of rest. This pain is reproducible and stems from inadequate blood flow, leading to the accumulation of lactic acid produced during anaerobic...
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Related Experiment Video

Updated: Jun 22, 2026

Non-invasive Assessment of Microvascular and Endothelial Function
05:41

Non-invasive Assessment of Microvascular and Endothelial Function

Published on: January 29, 2013

Evaluation of endothelial function using finger plethysmography.

A K Faizi1, D W Kornmo, S Agewall

  • 1Department of Medicine, Aker University Hospital and Oslo University, Oslo 0514, Norway.

Clinical Physiology and Functional Imaging
|June 26, 2009
PubMed
Summary
This summary is machine-generated.

Optimal blood flow occlusion for maximal reactive hyperaemic index (RHI) response is 5 minutes. Forearm occlusion is recommended over upper-arm occlusion due to reduced discomfort.

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Area of Science:

  • Cardiovascular physiology
  • Vascular function assessment

Background:

  • Assessing endothelial function is crucial for cardiovascular health.
  • Reactive hyperaemia is a key indicator of vascular response to occlusion.

Purpose of the Study:

  • Determine the optimal blood flow occlusion duration for maximal reactive hyperaemic index (RHI) response.
  • Compare RHI measurements between lower-arm (forearm) and upper-arm occlusion.

Main Methods:

  • Utilized a novel finger plethysmograph (EndoPat) to analyze pulse wave amplitude.
  • Measured RHI in 30 healthy subjects with forearm cuff occlusions of 1.5, 3, 5, and 8 minutes.
  • Assessed RHI with 5-minute upper-arm occlusion in 20 subjects.

Main Results:

  • Maximal RHI response was achieved with 5-minute forearm occlusion.
  • No significant difference in RHI was observed between 5-minute forearm and 5-minute upper-arm occlusions.
  • Forearm occlusion resulted in significantly less subject discomfort compared to upper-arm occlusion.

Conclusions:

  • Recommends 5 minutes as the optimal occlusion duration for maximal RHI.
  • Forearm and upper-arm occlusions yield comparable RHI results.
  • Forearm occlusion is preferable due to improved patient comfort.