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(Stroke. 2000;31:1307.)
© 2000 American Heart Association, Inc.
Original Contributions |
Demographic, Morphological, and Clinical Characteristics of 1289 Patients With Brain Arteriovenous Malformation
From Berufsgenossenschaftliche Kliniken der Stadt Halle (C.H., H.M., J.M.), Bergmannstrost, Halle/Saale, Germany; Universitätsklinikum Benjamin Franklin (C.S., A.H., U.M., H.M.), Freie Universität Berlin, Berlin, Germany; Stroke Center/The Neurological Institute (C.S., R.R.S., J.P.M., H.M.), Columbia University, New York, NY; Toronto Hospital (K.T.), University of Toronto, Toronto, Canada; and Hôpital de Bicêtre (P.L.), Université Paris XI, Le Kremlin Bicêtre, France.
Correspondence to H. Mast, MD, Stroke Center/The Neurological Institute, 710 West 168th St, New York, NY 10032. E-mail hm56{at}columbia.edu
Background and Purpose—The purpose of this study was to assess demographic, clinical, and morphological characteristics of patients with brain arteriovenous malformations (AVMs).
Methods—Prospectively collected data of 1289 consecutive AVM patients from 3 independent databases (1 multicenter [Berlin/Paris/Middle and Far East, n=662] and 2 single centers [New York, n=337, and Toronto, n=290]) were analyzed. The variables assessed were age at diagnosis, sex, AVM size, AVM drainage pattern, AVM location in functionally important brain areas ("eloquence"), and type of presentation (hemorrhage, seizure, chronic headache, or focal neurologic deficit). Comparisons were made by ANOVA, contingency tables, and log-linear models.
Results—Overall, mean age at diagnosis was 31.2 years (95% CI 30.2 to 32.2 years), and 45% of the patients were female (95% CI 42% to 47%). AVM maximum diameter was <3 cm in 38% (95% CI 35% to 41%). Deep venous drainage was present in 55% (95% CI 52% to 59%). An eloquent AVM location was described in 71% (95% CI 69% to 74%). AVM hemorrhage occurred in 53% (95% CI 51% to 56%). Generalized or focal seizures were described in 30% (95% CI 27% to 33%) and 10% (95% CI 8% to 12%), respectively. Chronic headache was recorded in 14% (95% CI 12% to 16%). Persistent neurological deficits were found in 7% (95% CI 6% to 9%), and progressive neurological deficits in 5% (95% CI 4% to 6%). Significant differences between centers were found for age (P<0.001), sex (P=0.04), eloquence (P=0.04), size (P<0.001), hemorrhage (P=0.006), persistent neurological deficit (P<0.001), and reversible neurological deficit (P=0.013). The intercenter difference found for hemorrhage frequency did not remain after adjustment for AVM size.
Conclusions—Baseline characteristics differed considerably between centers. The differences found in patient age and AVM size may be explained by center-specific referral patterns and the influence of access to treatment resources, whereas those found for other characteristics may be attributable to center-specific definitions. Analysis of natural history data from tertiary referral center databases may be improved by consistent definitions applicable to the entire population of AVM patients.
Key Words: cerebral arteriovenous malformations • cerebral hemorrhage • cerebrovascular disorders • epidemiology • intracerebral hemorrhage
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