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Taslimi, Shervin; Modabbernia, Amirhossein; Amin-Hanjani, Sepideh; Barker, Fred G; Macdonald, R Loch
Neurology, 2016-May-24, 2016-05-24, 20160524, Letnik: 86, Številka: 21Journal Article
OBJECTIVE:We pooled the results of studies on natural history of cavernous malformations (CM) to calculate point estimates and investigate main sources of heterogeneity. METHODS:We searched MEDLINE, EMBASE, and ISI Web of Science for relevant studies published before May 2015. We used fixed or random effects models and meta-regression to pool the data. RESULTS:Twenty-five studies were entered into the meta-analysis (90–1,295 patients depending on the analysis). Bleeding was defined as symptomatic hemorrhage plus radiologic evidence of hemorrhage. Sources of heterogeneity were identified as mixture of hemorrhage and rehemorrhage, mixture of rehemorrhage before and after 2 years of first bleeding, brainstem vs other locations, and calculation method. The rehemorrhage rate was higher than the hemorrhage rate (incidence rate ratio 16.5, p < 0.001, 95% confidence interval CI 9.7–28.0). Rehemorrhage within 2 years of the first hemorrhage was higher than after that (incidence rate ratio 1.8, p = 0.042, 95% CI 1.5–2.0). In two metaregression models, rough estimate of the annual incidence rate of hemorrhage was 0.3% (95% CI 0.1%–0.5%) and 2.8% (2.5%–3.3%) per person year in nonbrainstem and brainstem lesions and rough estimate of annual rehemorrhage rate per person year was 6.3% (3%–13.2%) and 32.3% (19.8%–52.7%) in nonbrainstem and brainstem lesions. Median time to rehemorrhage was 10.5 months. Posthemorrhage full recovery was 38.8%/person-year (28.7%–48.8%). Posthemorrhage full recovery or minimal disability was 79.5%/person-year (74.3%–84.8%). Mortality after bleeding was 2.2%. CONCLUSIONS:The incidence of symptomatic hemorrhage or rehemorrhage is higher in brainstem lesions. First symptomatic hemorrhage increases the chance of symptomatic rehemorrhage, which decreases after 2 years.
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