5APR

Crew Tests Emergency Medical Procedures Without Gravity

1 min read

16:13UTC

CPR, choking response, and a full medical kit checkout: the crew rehearsed what happens when someone needs help 322,000 km from the nearest hospital.

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Key takeaway

First CPR and choking-response data from translunar space informs future mission medical protocols.

The Artemis II crew tested CPR and choking-response procedures in microgravity on Day 5, evaluating which terrestrial emergency medical techniques function without gravity. Commander Reid Wiseman and Pilot Victor Glover checked the onboard medical kit: thermometer, blood pressure monitor, stethoscope, otoscope. ¹

CPR relies on compressing a patient's chest against a firm surface. In microgravity, pushing down on a person pushes you away from them. The crew evaluated alternative restraint and compression methods, reporting which techniques produced effective force transfer. The results feed directly into emergency medical protocols for Artemis III surface operations and longer missions where evacuation to Earth is not possible.

The cabin pressure false alarm during TLI preparation , disclosed by Hansen rather than NASA, gave the crew direct experience with emergency warnings. The spacesuit testing completed earlier on Day 5 validated what the crew would wear in a depressurisation event. The medical demonstrations completed the emergency systems validation sequence: suits, pressure integrity, and now medical response.

Deep Analysis

In plain English

Cardiopulmonary resuscitation (CPR) works because pressing on a person's chest compresses the heart, pumping blood when it cannot beat on its own. On Earth, you push down and gravity keeps both people on the ground. In space, pushing down on someone pushes you away from them. The crew tested restraint methods, body positions, and compression techniques to find approaches that work without gravity. This data will determine emergency medical protocols for Artemis III and longer missions where a medical emergency cannot be resolved by returning to Earth within hours.

Source Landscape

This story draws on neutral-leaning sources

Primary parallel: ISS has maintained continuous medical protocols for microgravity CPR since the station became continuously crewed in 2000. Russian and American flight surgeons developed the 'bear hug' and 'reverse bear hug' restraint methods, which require an assisting crew member to hold the rescuer in place while compressions are performed. ISS protocols are adapted for a vehicle where resupply and medical evacuation are possible within days.

Counter-parallel: Artemis III's 30-day surface stay and future Mars missions require protocols that function without evacuation options. The data from Artemis II will need to be extended for those scenarios, where a crew member could face a medical emergency with no nearby hospital and a return journey measured in months.

Sources:NASA

Mentions:Reid Wiseman →Victor Glover →NASA →Prima →Artemis II →Russia →Artemis III →Artemis I →CPR →

First Reported In

Update #4 · Day 5: Lunar Gravity Reclaims Humans for the First Time Since 1972

NASA· 5 Apr 2026

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Different Perspectives

ESA

The European Service Module has operated without anomaly for five consecutive days, with the OMS-E engine's translunar injection precision directly responsible for eliminating both correction burns. ESA's hardware contribution is the mission's highest-performing subsystem.

NASA

NASA cancelled a second consecutive outbound correction burn and confirmed Orion in lunar gravitational dominance, while declining to publish any crew radiation dose data through a complete G3 storm cycle. Bipartisan congressional rejection of its $18.8 billion FY2027 budget proposal means the agency faces a political fight even as its spacecraft performs above expectations.

Dual-framework nations

Signing both the Artemis Accords and the ILRS framework is rational hedging, not defection; smaller nations maximise access without exclusive commitment. Lunar governance is genuinely multipolar, and the US coalition count of 61 overstates exclusivity.

Boeing / Northrop Grumman

SLS component production spans more than 40 US states, giving the industrial base strong political protection regardless of commercial alternatives. Congressional mandates guarantee contracts through FY2029, insulating the supply chain from technical programme changes.

NASA Office of Inspector General

The IRB heat shield findings should have been published before launch. The Starship HLS is two years behind schedule with a worsening manual control dispute. NASA has no crew rescue capability for lunar surface operations. The programme is proceeding with documented, unresolved risks.

SpaceX

Starship HLS development is ongoing. SpaceX disputes the characterisation of the manual crew control requirement as unresolved, maintaining its autonomous landing architecture meets mission safety objectives. The company has not publicly responded to the OIG's worsening-trend characterisation.