A 22-year-old man presents with recurrent episodes of generalized weakness beginning after rest following strenuous exercise. Episodes last 20-45 minutes and are associated with mild myotonia. Vital signs show HR 78/min, BP 128/82 mmHg, RR 16/min, temperature 37°C, SpO2 98%. Serum potassium is 5.8 mEq/L during an acute attack. Creatine kinase is normal. He denies recent medication use or similar family history. Which of the following is the most likely diagnosis?
- A)Polymyositis
- B)Botulism
- C)Lambert-Eaton syndrome
- D)ALS
- E)Hyperkalemic periodic paralysisGABARITO
Explicação
Hyperkalemic periodic paralysis is due to a skeletal muscle sodium channel abnormality that causes transient weakness associated with elevated potassium during attacks. Episodes are often brief and may follow rest after exercise. Ver explicação completa e trilha adaptativa →