• Daisuke Mizu, Yoshinori Matsuoka, Ji-Young Huh, Yuka Kamitani, Satoru Fujiwara, and Koichi Ariyoshi.
• Department of Emergency Medicine, Kobe City Medical Center General Hospital, 2-1-1, Minatojimaminami-machi, Chuo-ku, Kobe-shi, Hyogo 650-0047, Japan. Electronic address: water@kcho.jp.
• Am J Emerg Med. 2022 Aug 1; 58: 120-125.

ObjectiveCentral nervous system (CNS) infections are often suspected in adult patients with fever-associated seizures. However, it is unclear whether lumbar puncture (LP) is routinely required in patients with fever-associated seizures. This study aimed to examine the prevalence of meningitis and encephalitis in adult patients with fever-associated seizures and to evaluate whether LP is routinely required.MethodsWe retrospectively studied patients aged ≥16 years who presented to the emergency department with complaints of seizures and fever above 37.5 °C who were admitted to the hospital between January 2017 and December 2019. LP was performed when the emergency physician suspected meningitis or encephalitis. Neurologists assessed patients with normal cerebrospinal fluid (CSF) findings and those admitted without LP after hospitalization. A neurologist confirmed the diagnoses of meningitis and encephalitis.ResultsThe study included 148 patients. Ninety-seven patients (65.5%) were male, and the median age was 60 years. LP was performed in 105 patients (70.9%), and 14 (13.4%) had CSF pleocytosis. Meningitis and encephalitis were diagnosed in nine patients (6.1%), of whom four (2.8%) had CNS infections. Patients diagnosed with meningitis and encephalitis were more likely to have Glasgow Coma Scale <13 (P = 0.03) and less likely to have a history of seizures or epilepsy (P = 0.04) and had higher C-reactive protein levels than the other patients (P = 0.02).ConclusionThe prevalence of meningitis or encephalitis is relatively low in adult patients with fever-associated seizures. Lumbar puncture is considered unnecessary to be performed routinely, but its indication should be carefully considered with reference to the clinical course, comorbidities, and blood tests. Further validation studies with larger sample sizes are needed to confirm the findings of this study.Copyright © 2022 The Authors. Published by Elsevier Inc. All rights reserved.

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