Study about the Manchester Triage System Subtriage in Patients That Visited the Emergency Department Due to Headache.

Introduction: Headache is a frequent cause of consultation; it is important to detect patients with secondary headache, particularly high-risk secondary headache. Such systems as the Man-chester Triage System (MTS) are used for this purpose. This study aims to evaluate the frequency of sub-triage in patients attending the Emergency Department due to headache. Material and methods: We studied a series of consecutive patients who came to the Emer-gency Department with headache and presenting some warning sign, defined as the presence of signs leading the physician to request an emergency neuroimaging study and/or assessment by the on-call neurologist. The reference diagnosis was established by neurologists. We evaluated the MTS triage level assigned and the presence of warning signs that may imply a higher level than that assigned. Results: We registered a total of 1,120 emergency department visits due to headache, and 248 patients (22.8%) were eligible for study inclusion. Secondary headache was diagnosed in 126 cases (50.8% of the sample; 11.2% of the total), with 60 cases presenting high-risk secondary headache (24.2%; 5.4%). According to the MTS, two patients were classified as immediate (0.8%), 26 as very urgent (10.5%), 147 as urgent (59.3%), 68 as normal (27.4%), and five as not urgent (2%). The percentage of patients under-triaged was 85.1% in the very urgent classification level and 23.3% in the urgent level. Conclusion: During the study period, at least one in 10 patients attending the Emergency Department due to headache had secondary headache; one in 20 had high-risk secondary heada-che. The MTS under-triaged most patients with warning signs suggesting a potential emergency. (C) 2020 Sociedad Espanola de Neurologia. Published by Elsevier Espana, S.L.U. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).