Waxing and Waning Hand Weakness

75-year-old man with a history of angina and hypertension was referred to a neurology outpatient clinic for a 6-week history of short-lived episodes of loss of power in his right hand, which lasted only up to 5 min at a time. These episodes were frequent, occurring daily. A week before his examination, his symptoms suddenly re-appeared and this time remained present. At that point, he was seen at the A&E, and a CT head scan was performed, which showed normal findings.