system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 57-year-old man presents with episodic left periorbital pain that radiates to the left frontotemporal side of his head for the last 2 weeks. The episodes are severe and are usually present for 1–2 hours before bedtime. During these episodes, he has also noticed lacrimation on the left side and a runny nose. He has tried over-the-counter analgesics with no relief. He currently has a headache. He denies any cough, seizure, nausea, vomiting, photophobia, phonophobia, or visual disturbances. His past medical history is significant for a myocardial infarction 1 year ago, with residual angina with exertion. The patient has a 10 pack-year history of smoking, but no alcohol or recreational drug use. His vital signs include: blood pressure 155/90 mm Hg, pulse 90/min, and respiratory rate 15/min. Physical examination is significant for a left-sided Horner’s syndrome. Which of the following is the next best step in the acute management of this patient’s most likely condition?
assistant
100% oxygen