Post-EVA: Cardiopulmonary Resuscitation (CPR)
Post-EVA adaptation of: Life-saving procedure for cardiac arrest, requiring technique modifications in 1/6 gravity lunar environment.
Indications
Cardiac arrest (no pulse, no breathing).
Contraindications
Valid do-not-resuscitate order. Obvious signs of death incompatible with life (decapitation, rigor mortis).
Equipment Required
Standard Equipment
Hands (bare minimum). AED, bag-valve mask, oxygen, IV access supplies, epinephrine, amiodarone.
Lunar Medical Bay Substitutions
All standard plus: body restraint straps (critical — in 1/6g, compressions push compressor away unless body is anchored), AED (mandatory in all lunar habitats), pure oxygen supply, telemedicine video setup for Earth guidance.
Procedure Steps
Call for help. Check scene safety. Confirm unresponsiveness. Check pulse (carotid, 10 seconds). No pulse: begin compressions at 100-120/min, depth 5-6cm. Ratio 30:2 until advanced airway. Minimize interruptions. AED as soon as available. Epinephrine 1mg IV every 3-5 min. Treat reversible causes (4Hs and 4Ts).
Lunar Technique Modifications (1/6 Gravity)
CRITICAL LUNAR MODIFICATION: Secure patient to floor or wall with restraint straps before beginning compressions — unanchored body will float/slide in 1/6g. Compressor must brace against wall or floor for counter-force. Compression depth 5-6cm (same) but force required is 1/6 of Earth — risk of over-compressing. Two-person CPR with one stabilizing patient and one compressing preferred. Defibrillation pads must contact dry skin — suit removal required.
Telemedicine Guidance Points
Contact Earth Medical Relay (+1.3s delay) at these critical decision points:
Activate Earth telemedicine immediately on arrival at arrest. Request rhythm interpretation support. Update every 2 minutes on rhythm, pulse checks, medications administered. Await guidance on termination criteria.
Training Requirements
All lunar residents: annual BLS certification. Medical officers: ACLS certification. CPR in lunar gravity drills quarterly.
Possible Complications
Rib fractures, pneumothorax, liver laceration, gastric distension.