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Dalton’s law states total pressure equals sum of partial pressures. As altitude increases, barometric pressure drops, lowering inspired PO₂ despite constant FiO₂. This reduces alveolar PO₂ and hemoglobin saturation. Boyle’s law governs volume expansion (e.g., pneumothorax). Charles’s relates temperature, not oxygen partial pressure. Henry’s concerns gas solubility (decompression sickness). Thus, Dalton’s law explains decreased SpO₂ at altitude. Supplemental oxygen or reduced cabin altitude are corrective strategies.

Placenta previa presents with painless vaginal bleeding in late pregnancy. Abruption is painful with uterine tenderness. Uterine rupture is catastrophic with severe pain and absent fetal heart tones. Bleeding is never normal at 36 weeks. Prehospital management includes avoiding vaginal exams, securing IVs, fluids/blood if unstable, and rapid transport to surgical obstetric capability.

Nifedipine, a calcium channel blocker, is commonly used as a tocolytic to delay preterm labor, providing time for corticosteroid administration and transfer to tertiary care. Oxytocin stimulates labor, not inhibits it. Methylergonovine and misoprostol are uterotonics for postpartum hemorrhage. In transport, monitor maternal BP closely, as nifedipine can cause hypotension. Coordination with OB teams ensures safe continuation and timely neonatal support on arrival.

Succinylcholine causes depolarization and potassium release, which is exaggerated in neuromuscular disorders (ALS, muscular dystrophy, prolonged immobility). Resulting hyperkalemia may cause fatal arrhythmias. Rocuronium, vecuronium, and cisatracurium are non-depolarizing alternatives. In air transport, anticipation of these risks ensures safe RSI drug selection.

At altitude, reduced barometric pressure lowers PAO₂ and subsequent PaO₂. A PaO₂ of 52 mmHg on FiO₂ 0.4 indicates significant hypoxemia. The priority is to increase oxygen delivery—raise FiO₂, and coordinate with the flight crew to reduce cabin altitude if aircraft performance permits. COPD patients may have V/Q mismatch; moderate PEEP (5–8 cm H₂O) can help, but jumping to 15 risks hyperinflation and hypotension. Hyperventilation to reduce PaCO₂ will not correct hypoxemia and may cause dynamic hyperinflation in COPD. Maintaining current settings accepts inadequate oxygenation that threatens organ perfusion and increases arrhythmia risk. Flight physiology planning should include oxygen reserves, ABG or reliable oximetry trending, and contingency pressurization profiles. Balancing oxygenation while avoiding barotrauma and hemodynamic compromise is central to safe fixed-wing COPD transports.