Basic life support in microgravity: evaluation of a novel method during parabolic flight.

Area of Science:

• Space Medicine
• Emergency Medical Services
• Physiology

Background:

• Cardiac arrest in microgravity poses unique challenges for emergency response.
• Current procedures require patient restraint systems, often needing 2 minutes for deployment.
• Unaided, single-person cardiopulmonary resuscitation (CPR) capability is critical for space missions.

Purpose of the Study:

• To evaluate a novel CPR technique using leg encirclement for patient restraint in microgravity.
• To assess the feasibility and effectiveness of this method for basic life support in space.

Main Methods:

• Two investigators performed the leg-encirclement CPR technique and traditional CPR on an instrumented mannequin.
• Parabolic flights simulated microgravity conditions for testing.
• Mannequin modifications ensured accurate chest compression and ventilation measurements.

Main Results:

• Mean chest compression depth in microgravity (44.0 mm) was comparable to +1 Gz (43.6 mm).
• Mean microgravity compression rate (68.3/min) was significantly lower than +1 Gz (97.1/min).
• Mean microgravity tidal volume (491 ml) was comparable to +1 Gz (507.6 ml).

Conclusions:

• The leg-encirclement technique shows potential for performing CPR in microgravity.
• Challenges primarily affected compression rate, but essential parameters like depth and ventilation were maintained.
• This method may enable basic life support in various microgravity environments.