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Phrenic Nerve Conduction in Healthy Subjects.

Marjolaine Vincent1, Isabelle Court-Fortune1, Frédéric Costes2

  • 1Service de Pneumologie et Oncologie Thoracique, CHU St-Etienne, France.

Muscle & Nerve
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Summary

This study establishes normal phrenic nerve conduction values in healthy adults. Age and sex influence these measurements, providing crucial reference data for clinical assessments.

Keywords:
Phrenic nerve conductionhealthy subjectsnormative values

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Area of Science:

  • Neurology
  • Physiology
  • Clinical Electrophysiology

Background:

  • Phrenic nerve stimulation is a key method for assessing diaphragm function.
  • Established normal values for phrenic nerve conduction in a large, healthy population are currently lacking.
  • This gap hinders accurate interpretation of electrodiagnostic studies.

Purpose of the Study:

  • To determine reference values for diaphragm compound muscle action potential (CMAP) via noninvasive phrenic nerve stimulation.
  • To establish normative data for phrenic nerve conduction parameters in a large cohort of healthy individuals.
  • To identify potential influencing factors such as age and sex on these measurements.

Main Methods:

  • Recruited 155 healthy subjects aged 25-79 years.
  • Measured mean amplitude (PhrenAmp) and latency (PhrenLat) of motor responses using Bolton's method for noninvasive phrenic nerve stimulation.
  • Assessed tolerance to the stimulation procedure.

Main Results:

  • Established lower limits for PhrenAmp (0.28 mV right, 0.25 mV left) and upper limits for PhrenLat (8.41 ms right, 8.56 ms left).
  • Found a correlation between PhrenLat and age.
  • Observed significantly higher PhrenAmp, PhrenLat, and area in men compared to women.
  • Reported excellent tolerance to phrenic nerve stimulation.

Conclusions:

  • This study provides essential normative values for phrenic nerve motor responses in a large healthy cohort.
  • Age and sex were identified as significant factors influencing phrenic nerve conduction parameters.
  • These findings offer valuable reference data for clinical electrodiagnostic assessments of diaphragm function.