Registered Respiratory Therapist CSE Practice Exam

Hypoxemia in MG typically comes from weakness of the respiratory muscles, which reduces ventilation and oxygen delivery. Supplemental oxygen directly increases the amount of oxygen available to the lungs and bloodstream, helping to raise arterial oxygen levels while definitive MG treatments work to improve ventilatory capacity. The other options don’t address oxygenation for MG: hyperbaric oxygen therapy is not a standard treatment for MG-related hypoxemia, nebulized saline helps with mucus but not oxygen levels, and a promethazine inhaler isn’t a lung-oxygenation therapy. Oxygen is the appropriate supportive therapy here.