Case 522 · ICHD-3 8.1.3
8.1.3 Carbon monoxide (CO)-induced headache
- Origin
- Synthetic
- Language
- English — also available in German
- Contributed by
- Imported case — HeadAI synthetic vignettes (de Andrade JBC, da Silva Costa TB, Vasconcelos JL, Lopes TLM, Balsells MD, Cristofolini VL, Querobin SO, Filho FMR. Validation of an AI-based platform for structured diagnosis of headache disorders using ICHD-3 criteria. BMC Neurology 25, 489 (2025). doi:10.1186/s12883-025-04473-1. Dataset: Andrade J. Head.AI Platform. Mendeley Data, V2 (2025). doi:10.17632/4fms6cw2s5.2)
Anamnesis
Identification: Male patient, 35 years old, referred to the emergency department with a progressive headache lasting 6 hours.
Current Illness History:
The patient reports a bilateral, pulsatile headache of moderate to severe intensity, associated with nausea and dizziness.
Symptoms began after spending approximately 3 hours in an enclosed space with a malfunctioning gas heater.
The patient denies any previous history of primary headaches (such as migraine or tension-type headache).
Physical/Neurological Examination:
The patient is conscious but exhibits slight mental confusion.
No focal neurological deficits are observed.
The patient has a normal PaO₂, but elevated carboxyhemoglobin (COHb) at 25% (normal value < 3% in non-smokers).
Report this case — e.g. suspected re-identification risk.