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Related Experiment Video

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Non-invasive Assessment of Microvascular and Endothelial Function
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Postprandial decrease in vascular resistance correlated with change in second derivative of finger plethysmogram in

Kunihiko Tanaka1, Kimiko Kamihira2, Fumie Minoura2

  • 1Department of Radiological Technology, Gifu University of Medical Science, Seki, Japan.

VASA. Zeitschrift Fur Gefasskrankheiten
|December 25, 2014
PubMed
Summary

Meal ingestion impacts finger plethysmogram (SDPTG) wave ratios, reflecting changes in total peripheral resistance (TPR). Postprandial increases in the d/a wave ratio correlate with decreased TPR in young adults.

Keywords:
Cardiac outputarterial pressurehypertensionphotoplethysmographvasodilation

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Area of Science:

  • Cardiovascular Physiology
  • Biomedical Engineering

Background:

  • The second derivative of the finger plethysmogram (SDPTG) yields five waves (a-e).
  • Waves b-e are normalized to wave 'a' for comparative analysis.
  • Investigating meal ingestion effects on SDPTG in different age groups.

Purpose of the Study:

  • To examine the impact of meal ingestion on SDPTG in young and elderly individuals.
  • To analyze the relationship between SDPTG changes and total peripheral resistance (TPR) post-meal.

Main Methods:

  • Measured mean arterial pressure and SDPTG before and after meals in young and elderly subjects.
  • Assessed stroke volume, pulse rate, and TPR in young subjects.
  • Correlated TPR with SDPTG wave ratios.

Main Results:

  • Young subjects showed increased postprandial d/a ratio and decreased TPR, significantly correlated.
  • Elderly subjects without hypertension treatment also exhibited increased postprandial d/a.
  • Elderly subjects undergoing hypertension treatment did not show this d/a increase.

Conclusions:

  • The d/a wave ratio serves as an indicator of TPR changes.
  • Meal ingestion does not appear to further decrease TPR, which is already lowered by hypertension medication.
  • Findings enhance understanding of cardiodynamics related to meal consumption.