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Related Experiment Videos

Postprandial effects on twitch transdiaphragmatic pressure.

W D C Man1, Y M Luo, N Mustfa

  • 1Dept of Respiratory Medicine and Allergy, Guy's, King's and St Thomas' School of Medicine, London, UK. William.man@kcl.ac.uk

The European Respiratory Journal
|October 3, 2002
PubMed
Summary

Eating significantly increases diaphragm strength measurements. Post-meal measurements of twitch transdiaphragmatic pressure (Pdi,tw) are higher due to increased gastric pressure and reduced abdominal compliance.

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Area of Science:

  • Respiratory Physiology
  • Diaphragm Function Assessment

Background:

  • Twitch transdiaphragmatic pressure (Pdi,tw) is a key measure of diaphragm strength.
  • Factors like posture and lung volume influence Pdi,tw, but gastric filling effects are unknown.

Purpose of the Study:

  • To investigate the impact of gastric filling on Pdi,tw measurements.
  • To determine if postprandial state affects diaphragm strength assessment.

Main Methods:

  • Pdi,tw was measured in seven healthy volunteers under fasting and postprandial conditions.
  • Phrenic nerve magnetic stimulation was used for Pdi,tw assessment.
  • Measurements included unpotentiated and potentiated Pdi,tw, gastric pressure, and abdominal compliance.

Main Results:

Related Experiment Videos

  • Postprandial Pdi,tw was significantly higher than fasting Pdi,tw.
  • Increased gastric pressure and reduced abdominal compliance contributed to higher postprandial Pdi,tw.
  • Twitch oesophageal pressure remained unchanged postprandially.

Conclusions:

  • The postprandial state elevates Pdi,tw, potentially affecting diaphragm strength assessments.
  • Clinicians should consider gastric filling when interpreting Pdi,tw for patient follow-up or intervention studies.