title: To Load or Not to Load? Aspirin Loading in Acute Ischemic Stroke: A Study of Clinical Outcomes.
abstract: OBJECTIVE
  Aspirin is known to reduce mortality and recurrent vascular events. However, there are no reports about the dose-response of loading aspirin in treating acute ischemic stroke. The objective of this study was to compare the effectiveness of different loading doses of aspirin in acute ischemic stroke presenting within 48 hours of symptom onset.
  
  
  METHODS
  This was a retrospective, hospital-based cohort study. Patients were classified as high dose (160-325 mg) or low dose (<160 mg) based on the initial loading dose of aspirin at the emergency department. The primary outcome measure was a favorable modified Rankin Scale (mRS) score of 1 or lower on discharge. Secondary outcomes included in-hospital mortality, stroke progression during admission, and bleeding events. A propensity score with 1:3 matching was used to balance baseline characteristics, and stepwise multiple logistic regression was performed for variable adjustment.
  
  
  RESULTS
  From a total of 7738 available patients, 3802 patients were included. Among them, 750 patients were in the high-dose group. Multiple logistic regression after matching revealed that the high-dose group was significantly associated with a favorable clinical outcome on discharge (odds ratio: 1.49, 95% confidence interval: 1.17-1.89, P <.01), but not mortality or stroke progression. The high-dose group also experienced more minor bleeding events.
  
  
  CONCLUSIONS
  A higher loading dose of aspirin (160-325 mg) can be beneficial in treating acute ischemic stroke, although there is an increased risk of minor bleeding.
authors.affiliation: Department of Emergency Medicine, Linkou Chang Gung Memorial Hospital, Taiwan.
authors.forename: Tse-Hsuan
authors.initials: TH
authors.lastname: Su
authors.affiliation: Department of Emergency Medicine, Linkou Chang Gung Memorial Hospital, Taiwan.
authors.forename: Yi-Ling
authors.initials: YL
authors.lastname: Chan
authors.affiliation: Department of Neurology, Chiayi Chang Gung Memorial Hospital, Taiwan.
authors.forename: Jiann-Der
authors.initials: JD
authors.lastname: Lee
authors.affiliation: Department of Neurology, Chiayi Chang Gung Memorial Hospital, Taiwan.
authors.forename: Meng
authors.initials: M
authors.lastname: Lee
authors.affiliation: Emergency Medicine, Chiayi Chang Gung Memorial Hospital, Taiwan.
authors.forename: Leng-Chieh
authors.initials: LC
authors.lastname: Lin
authors.affiliation: Clinical Informatics and Medical Statistics Research Center, Chang Gung University, Taiwan. Electronic address: ywwen@mail.cgu.edu.tw.
authors.forename: Yu-Wen
authors.initials: YW
authors.lastname: Wen
authors.affiliation: Stroke Center and Department of Neurology, Linkou Chang Gung Memorial Hospital, Taiwan; College of Medicine, Chang Gung University, Taiwan. Electronic address: thlee@adm.cgmh.org.tw.
authors.forename: Tsong-Hai
authors.initials: TH
authors.lastname: Lee
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001241:Aspirin / Q000008:administration & dosage* / Q000009:adverse effects; D002545:Brain Ischemia / Q000175:diagnosis / Q000188:drug therapy* / Q000401:mortality; D002317:Cardiovascular Agents / Q000008:administration & dosage* / Q000009:adverse effects; D004185:Disability Evaluation; D018450:Disease Progression; D005260:Female; D006470:Hemorrhage / Q000139:chemically induced; D017052:Hospital Mortality; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D016017:Odds Ratio; D011237:Predictive Value of Tests; D057216:Propensity Score; D012042:Registries; D012074:Remission Induction; D012189:Retrospective Studies; D012307:Risk Factors; D020521:Stroke / Q000175:diagnosis / Q000188:drug therapy* / Q000401:mortality; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D002317:Cardiovascular Agents; D001241:Aspirin
keywords: Aspirin; acute stroke; loading dose; observational study; treatment