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Impact of Helicopter Vibrations on In-Ear PPG Monitoring for Vital Signs-Mountain Rescue Technology Study (MoReTech).

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In-ear pulse oximetry shows promise for monitoring vital signs during helicopter transport. Simulated helicopter vibrations did not significantly affect signal quality or pulse rate measurements, though oxygen saturation accuracy needs further investigation.

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Area of Science:

  • Biomedical Engineering
  • Medical Devices
  • Physiological Monitoring

Background:

  • Pulse oximeters are crucial for monitoring preclinical patients' cardiorespiratory status.
  • Conventional finger-based pulse oximeters are susceptible to motion artifacts during air transport.
  • In-ear sensors offer a potential alternative for reliable vital sign monitoring in challenging environments.

Purpose of the Study:

  • To assess the impact of simulated helicopter vibration on in-ear photoplethysmogram (PPG) signals.
  • To evaluate if vibration affects the calculation of pulse rate (PR) and oxygen saturation (SpO2) from in-ear PPG.
  • To compare the signal quality of in-ear PPG during rest versus vibration exposure.

Main Methods:

  • In-ear PPG signals were recorded from 17 participants at rest and during simulated helicopter vibration.
  • Signal quality indicators (SQIs) were extracted and compared between conditions.
  • In-ear derived PR and SpO2 were compared against clinical reference monitors (ECG and finger SpO2 sensor).

Main Results:

  • No significant differences were found in any signal quality indicators (SQIs) between rest and vibration conditions (p > 0.05).
  • Pulse rate (PR) derived from in-ear PPG showed substantial agreement with reference measurements (CCCrest = 0.96; CCCvibration = 0.96).
  • Oxygen saturation (SpO2) derived from in-ear PPG showed poor agreement with reference measurements (CCCrest = 0.41; CCCvibration = 0.19).

Conclusions:

  • Simulated helicopter vibration does not significantly impact the quality of in-ear PPG signals or the derived pulse rate.
  • In-ear sensors maintain reliable pulse rate monitoring during simulated helicopter transport.
  • Further research is needed to improve the accuracy of in-ear SpO2 measurements under vibration.