2) Myasthenic crisis - consider intubation when forced vital capacity (FVC) is < 10-15 mL/kg or when negative inspiratory force (NIF) is under -20 cmH2O.
3) Vertebral artery dissection - headaches are not present in all patients. Most heal spontaneously. no difference in efficacy of anticoagulants vs antiplatelet agents from death or subsequent stroke
4) Hyperkalemia on ECG - the ECG changes for hyperkalemia are neither necessarily sequential nor present for all potassium levels. Consider giving Calcium.
5) Recurrent CBD stones after cholecystectomy - This can happen in approximately 10% of patients!