Which of the following is a type of severe weakness that can develop after prolonged ICU stay?

• A. Critical-Illness Polyneuropathy
• B. Guillain-Barré syndrome
• C. Osteoarthritis
• D. Myasthenia gravis

Answer: (A)

The key idea is recognizing a common ICU-related cause of severe, diffuse weakness: critical-illness polyneuropathy. In patients who have been critically ill for a long time, systemic inflammation, metabolic and nutritional disturbances, and other stressors can injure peripheral nerves, leading a widespread axonal neuropathy. This manifests as substantial weakness in most or all limbs, often with decreased or absent reflexes, and it can involve the respiratory muscles, making weaning from ventilation difficult. The weakness is typically generalized and symmetric, reflecting nerve involvement rather than a problem isolated to one muscle group or a focal lesion.

This fits well with the scenario of weakness developing after a prolonged ICU stay, making critical-illness polyneuropathy the best fit. In contrast, Guillain-Barré syndrome is an acute autoimmune process usually triggered by an infection and not a sequela of ICU stay. Osteoarthritis is a degenerative joint condition causing pain and stiffness, not a neuropathic weakness from critical illness. Myasthenia gravis is an autoimmune disorder of the neuromuscular junction characterized by fatigable weakness that fluctuates and isn’t specifically linked to a prior prolonged ICU course.