Antithrombotic medication and bleeding risk in patients with cerebral cavernous malformations: a cohort study.

Objective: Cerebral cavernous malformations (CCMs) are frequently diagnosed vascular abnormalities. The hemorrhagic risk associated with the use of long-term antithrombotic medication (ATM) in patients with CCMs is a matter of controversy. The aim of this study was to determine the hemorrhagic risk associated with ATM use in patients diagnosed with one or more CCMs.

Methods: Demographic, clinical, treatment, and ATM-related information on patients diagnosed with one or more CCMs at a single institution over more than 34 years was retrospectively recorded. Univariate and multivariate descriptive and survival analyses were used to assess potential risk factors associated with CCM-related hemorrhage at presentation and during follow-up (first or subsequent hemorrhage).

Results: A total of 408 patients were included in the analysis and 492 CCMs were followed up after diagnosis, for a total of 1616 lesion-years. Thirty-seven (7.5%) CCMs bled during follow-up, leading to an overall annual rate of CCM-related symptomatic hemorrhage of 2.3% (95% CI 1.7%-3.2%). Eighty-two patients harboring 91 CCMs (16.8%) were on ATM. When stratified for ATM, the annual rates of hemorrhage were 0.7% (95% CI < 0.01% to 4.2%) for the lesions in patients on ATM versus 2.5% (95% CI 1.8%-3.4%) for those not on ATM. ATM was not found to be associated with either an increased risk of CCM-related hemorrhage at presentation (p = 0.355) or an increased risk of CCM-related hemorrhage (first or subsequent hemorrhage) in multivariate descriptive (p = 0.912) and survival (p = 0.145) analyses.

Conclusions: The use of ATM does not seem to be associated with an increased risk of hemorrhage in patients diagnosed with CCMs.