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Related Experiment Videos

Physiologic chest sounds and helicopter engine noise

T J Poulton1, D W Worthington, T R Pasic

  • 1Life Flight of St. Joseph Hospital, Omaha, NE.

Aviation, Space, and Environmental Medicine
|April 1, 1994
PubMed
Summary

Amplifying chest sounds during helicopter transport is impossible because the noise spectrum completely overlaps with the sounds. Future research should focus on chest movement and carbon dioxide monitoring for ventilation assessment.

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Area of Science:

  • Medical acoustics
  • Aerospace medicine
  • Critical care transport

Background:

  • Air medical transport presents challenges for monitoring patient physiologic sounds.
  • Jet helicopter noise can mask critical auditory patient assessments.
  • Existing amplification or filtering methods may be insufficient.

Purpose of the Study:

  • To evaluate the feasibility of amplifying physiologic chest sounds during jet helicopter transport.
  • To compare the frequency spectra of chest sounds with helicopter noise.
  • To identify alternative methods for assessing ventilation in this environment.

Main Methods:

  • Comparative analysis of frequency spectra.
  • Physiologic chest sounds were analyzed.
  • Allison C-28 jet helicopter noise was analyzed.

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Main Results:

  • The frequency spectrum of physiologic chest sounds is fully contained within the noise spectrum of the jet helicopter.
  • Attempts to amplify chest sounds or filter helicopter noise were found to be ineffective.
  • Perception of chest sounds cannot be improved by these methods.

Conclusions:

  • Amplification or filtering systems are not viable for improving chest sound perception in jet helicopters.
  • Future research should investigate alternative indicators of ventilation.
  • Assessment of chest wall motion and end-tidal carbon dioxide levels are recommended.