Headache is a common reason to visit the emergency department (eD). tension-type headache (ttH) is the commonest headache. the diagnosis of ttH implies a mild condition, with no need for special tests. We evaluated the use of the International Classification of Headache Disorders (ICHD) criteria for TTH in the ED. We performed a cross-sectional study including all ED patients with a definite TTH diagnosis in their discharge report for 2.5 years. We evaluated whether the ICHD criteria for TTH were referenced and met. We analysed discrepancies concerning anamnesis or prior history and reclassified patients. A total of 211 out of 2132 patients fulfilled the criteria (9.9%). Only five patients fulfilled TTH criteria. Criteria A-D were referenced in 60-84% of patients and met in 16-74% of these patients. Anamnesis was discrepant in 87.5% as was prior history in 20.8%. After re-reclassification, 21 patients fulfilled the criteria for TTH (five) or probable TTH (16). In 106 patients, another headache was diagnosed, with migraine in 40 (18.9%), secondary headache in 64 (30.3%), and a life-threatening disorder in 13 (6.1%). In our sample, TTH was overdiagnosed. Only a minority of patients fulfilled the ICHD criteria. inconsistencies in prior medical history or anamnesis were frequent. This is an observational study with a cross-sectional design. Our study population included patients who visited the emergency department due to headache. The study was performed according to the Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) guidelines 17 .The study took place at the ED of the Clínico San Carlos University Hospital, Madrid (Spain), a third-level hospital with a reference population of 700.000 people. The study period was between Eligibility. The inclusion criteria were as follows: 1) patients visiting the ED because of headache and 2) patients with a definite diagnosis of "tension-type headache" in the ED discharge report. We excluded patients with 1) some degree of uncertainty in the diagnosis, such as "possible" or "probable"; 2) another headache diagnosed at the same time; and 3) no available information in the patient chart.We screened all the patients who visited the ED during the study period because of headache by using the ED database, which codifies patients by initial reason for consultation. We reviewed the digitalized reports and gathered the information from the discharge reports. We did not review any additional sources, and we did not evaluate any patients. The rationale for this was that we aimed to see if with the information present in the ED reports, TTH diagnosis was appropriate or not.The included demographic variables were sex; age; and relevant prior medical history, including current or past cancer, pathology of the immune system, and prior headache history. Clinical variables included headache description, with special attention to the presence of any red flag, neurological examination and abnormal focal signs, vital signs and general examination.
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