Lunar Hypertension
Earth designation: Hypertension
Persistently elevated blood pressure. The lunar environment creates paradoxical effects: initial hypotension from fluid redistribution often gives way to hypertension in established residents, driven by stress, sleep disruption, altered sodium regulation, and potentially radiation effects on the renin-angiotensin system.
Lunar Risk Factors
Chronic stress (isolation, confinement, occupational hazards). Sleep disruption from 14-day light cycles. High-sodium preserved foods in lunar diet. Radiation effects on renal function. Stimulant medication use.
Symptoms
Usually asymptomatic. Headache, visual changes, nose bleeds in hypertensive urgency/emergency.
Lunar Presentation
Headache in 1/6 gravity may also reflect intracranial pressure changes — distinguish carefully. Routine monitoring critical since symptoms are unreliable.
Diagnosis
Automated blood pressure monitoring. Target: <130/80 mmHg. Ambulatory BP monitoring over 24 hours to assess true baseline.
Treatment
Lifestyle modification, ACE inhibitors, ARBs, calcium channel blockers, diuretics.
Lunar Medical Bay Protocol
First line: lifestyle modification (exercise, sodium restriction, stress reduction). Pharmacological: amlodipine (calcium channel blocker) preferred — good stability in lunar storage conditions. ACE inhibitors (lisinopril) second line. Avoid beta-blockers as first line (may worsen exercise deconditioning). Monthly BP monitoring minimum.
Evacuation Criteria
Hypertensive emergency (>180/120 with end-organ damage). Uncontrolled hypertension with new neurological symptoms (rule out intracranial hemorrhage).
Prevention
Sodium-restricted diet, regular cardiovascular exercise, stress management, adequate sleep, routine monitoring.