In flight auscultation: comparison of electronic and conventional stethoscopes

Area of Science:

• Medical Devices
• Aviation Medicine
• Clinical Acoustics

Background:

• High ambient noise during air medical transport significantly impairs auscultation.
• Effective auscultation is crucial for patient assessment and management in critical care settings.

Purpose of the Study:

• To compare the efficacy of traditional versus amplified stethoscopes for auscultating heart and breath sounds during air medical transport.
• To evaluate the impact of amplified stethoscopes on diagnostic capabilities in a noisy aircraft environment.

Main Methods:

• A prospective, double-blind, randomized study was conducted involving 32 comparative auscultations.
• Traditional (Littman Cardiology III) and amplified (Littman 3100) stethoscopes were tested during real medical evacuations in a Falcon 50 aircraft.
• Auscultation quality was rated on a 0-10 scale, with statistical analysis using a t-test for paired values.

Main Results:

• Cardiac auscultation quality was significantly better with the amplified stethoscope (6.4 ± 1.9) compared to the traditional one (5.8 ± 1.5; P = .018).
• For lung sound auscultation, no significant difference was observed between the amplified (3.7 ± 2.9) and traditional (3.3 ± 2.4) stethoscopes (P = .15).

Conclusions:

• Amplified stethoscopes enhance the ability to auscultate cardiac sounds in the noisy environment of a Falcon 50 air ambulance.
• The benefit of amplified stethoscopes does not extend to lung sound auscultation in this setting.