An evaluation of the CHADS₂ stroke risk score in patients with atrial fibrillation who undergo percutaneous coronary revascularization.
BACKGROUND
There are various schemas designed to stratify the risk of thromboembolism (TE) in patients with atrial fibrillation (AF), of which the CHADS(2) (congestive heart failure, hypertension, age ≥ 75 y, diabetes, stroke [doubled]) score is the most widely studied. We evaluated whether the CHADS(2) score was adequate for TE risk stratification while assessing cardiac risk in patients with AF revascularized with coronary artery stents.


METHODS
We reviewed 604 consecutive patients with AF treated with at least one stent between 2001 and 2008 in relation to TE risk using CHADS(2) score. We stratified our patients with a CHADS(2) score ≤ 1 as low-moderate thromboembolic risk (group 1: n = 193, 32%) and > 1 as high risk (and, hence, requiring anticoagulation; group 2: n = 411, 68%). We determined the benefits and/or risks of oral anticoagulation (OAC) therapy in both cohorts.


RESULTS
Completed follow-up was achieved in 90.4% (mean 642.2 days). Group 1 event-free survival was better than group 2 (major adverse cardiovascular events [MACEs], log-rank test P = .03; and death, log-rank test P = .03). In group 1, event-free survival was better on OAC vs non-OAC use (death 5% vs 15%, P = .04; MACE 10% vs 26%, P < .01) with a trend for more major hemorrhages (12% vs 4%, P = .08). Stroke rate was 4.1% per 100 patient-years in patients without OAC therapy and 1.38% in patients on OAC therapy. Group 2 had a lower incidence of death (20% vs 34%, P < .01) and MACE (26% vs 43%, P < .01) among those on OAC therapy on discharge, with a higher incidence of major hemorrhages (18% vs 8%, P < .01).


CONCLUSIONS
In a population of patients with AF revascularized with stents, even those with CHADS(2) ≤ 1 should be regarded as being at high risk. OAC should be considered as thromboprophylaxis in patients with AF revascularized with coronary stents.
Ruiz-Nodar
Juan M
JM
Department of Cardiology, Hospital General Universitario de Alicante, Alicante, Spain.
Marín
Francisco
F
Department of Cardiology, Hospital Universitario Virgen de la Arrixaca, Murcia, Spain.
Manzano-Fernández
Sergio
S
Department of Cardiology, Hospital Universitario Virgen de la Arrixaca, Murcia, Spain.
Valencia-Martín
José
J
Department of Cardiology, Hospital General Universitario de Alicante, Alicante, Spain.
Hurtado
José A
JA
Department of Cardiology, Hospital Universitario Virgen de la Arrixaca, Murcia, Spain.
Roldán
Vanessa
V
Department of Hematology, Hospital Morales Meseguer, Murcia, Spain.
Pineda
Javier
J
Department of Cardiology, Hospital General Universitario de Alicante, Alicante, Spain.
Pinar
Eduardo
E
Department of Cardiology, Hospital Universitario Virgen de la Arrixaca, Murcia, Spain.
Sogorb
Francisco
F
Department of Cardiology, Hospital General Universitario de Alicante, Alicante, Spain.
Valdés
Mariano
M
Department of Cardiology, Hospital Universitario Virgen de la Arrixaca, Murcia, Spain.
Lip
Gregory Y H
GYH
University of Birmingham Centre for Cardiovascular Sciences, City Hospital, Birmingham, England. Electronic address: g.y.h.lip@bham.ac.uk.
D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D015906:Angioplasty, Balloon, Coronary; D001281:Atrial Fibrillation / Q000150:complications / Q000628:therapy*; D048909:Diabetes Complications / Q000150:complications; D005260:Female; D006333:Heart Failure / Q000150:complications; D006801:Humans; D006973:Hypertension / Q000150:complications; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012189:Retrospective Studies; D018570:Risk Assessment; D015607:Stents; D020521:Stroke / Q000209:etiology*; D016896:Treatment Outcome