title: Newly diagnosed atrial fibrillation after acute ischemic stroke and transient ischemic attack: importance of immediate and prolonged continuous cardiac monitoring.
abstract: Atrial fibrillation (AF) is the major cause of cardioembolic stroke. It often remains occult when asymptomatic and paroxysmal. We hypothesized that the detection of AF after acute ischemic stroke (AIS) or transient ischemic attack (TIA) could be improved by using continuous cardiac monitoring (CCM) immediately after admission. We sought to determine the detection rate of AF by immediate in-hospital CCM after cryptogenic and noncryptogenic AIS or TIA in patients without a previous diagnosis of AF. We retrospectively studied a cohort of 155 patients with cryptogenic and noncryptogenic AIS or TIA without known AF. We compared the detection rates of newly diagnosed AF (NDAF) in patients admitted to areas with CCM and those never admitted to these areas. We developed a multiple logistic regression model for identifying predictors of NDAF. We characterized NDAF episodes and analyzed how the availability of CCM data changed secondary prevention strategies. We detected NDAF in 21 patients (13.5%). Diagnostic rates of NDAF in patients who underwent CCM and those who did not undergo CCM were 18.2% and 2.2%, respectively (P = .005). The median time from admission to recognition of NDAF was 2.0 days. Most NDAFs were paroxysmal (95.2%) and lasted less than 1 hour (85.7%). Diabetes mellitus and infarct size were predictors of NDAF. Detection of NDAF prompted the initiation of anticoagulation therapy in 8.2% of the patients admitted to areas with CCM availability. Our findings suggest that immediate and prolonged CCM significantly improves the detection of NDAF after cryptogenic and noncryptogenic AIS or TIA, and that diabetes mellitus and infarct size are significantly associated with NDAF.
authors: Stroke Center, Institute of Neurosciences, University Hospital, Favaloro Foundation, Buenos Aires, Argentina. lucianosposato@gmail.com
authors: Luciano A
authors: LA
authors: Sposato
authors: Francisco R
authors: FR
authors: Klein
authors: Agustín
authors: A
authors: Jáuregui
authors: Marisol
authors: M
authors: Ferrúa
authors: Pablo
authors: P
authors: Klin
authors: Rafael
authors: R
authors: Zamora
authors: Patricia M
authors: PM
authors: Riccio
authors: Alejandro
authors: A
authors: Rabinstein
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001281:Atrial Fibrillation / Q000150:complications* / Q000175:diagnosis* / Q000503:physiopathology; D002545:Brain Ischemia / Q000209:etiology* / Q000503:physiopathology; D015331:Cohort Studies; D042241:Early Diagnosis; D004632:Emergency Medical Services / Q000379:methods / Q000592:standards*; D005260:Female; D006801:Humans; D002546:Ischemic Attack, Transient / Q000209:etiology* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000379:methods / Q000592:standards*; D012189:Retrospective Studies