Drilling into History for CT Examination

In cases where a CT is not obtained, three-quarters of missed cases occur due to not conducting the CT initially. To determine which patients need a CT, a thorough history is crucial. Asking about headache onset, particularly focusing on Thunderclap headache, is essential. Patients may perceive gradual onset as sudden, highlighting the importance of detailed questioning to ascertain the true nature of the headache. Clinicians need to inquire about the onset, severity, progression, and peak intensity of a headache to identify Thunderclap headaches, characterized by instantly peaking and severe pain.