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Sang-Wuk Jeong, MD; Keun-Hwa Jung, MD; Kon Chu, MD; Hee-Joon Bae, MD, PhD; Seung-Hoon Lee, MD; Jae-Kyu Roh, MD, PhD

Arch Neurol. 2004;61:905-909.

Background  Microbleeds on gradient-echo magnetic resonance (MR) imaging reflect bleeding-prone microangiopathy. The microbleeds are frequently detected in patients with primary intracerebral hemorrhage (PICH). However, some patients do not have microbleeds.

Objective  To clarify the risk factors associated with microbleeds in PICH, thus providing insight into the pathogenesis of PICH.

Design  Prospective study.

Setting  Neurology department of a tertiary referral center.

Patients  A consecutive series of 107 patients with PICH.

Interventions  Gradient-echo MR imaging to determine distribution patterns and numbers of microbleeds.

Main Outcome Measures  Clinical variables and the associated MR imaging abnormalities in patients with PICH with and without microbleeds.

Results  Patients with PICH who had microbleeds were significantly older (65.9 ± 10.9 years) than those without microbleeds (53.9 ± 13.0 years; P<.001), and previous stroke, medication with antithrombotics or anticoagulants, lacunes, and leukoaraiosis were more common in patients with microbleeds. However, potential triggering events tending to raise the blood pressure were more common in cases of PICH without microbleeds (18 [56.3%] vs 10 [15.4%]). In logistic regression analysis, age (odds ratio and 95% confidence interval: 1.07, 1.01-1.14), advanced leukoaraiosis (7.79, 1.05-57.74), number of lacunes (1.66, 1.21-2.28), and potential triggering events (0.18, 0.04-0.90) were independent risk factors associated with the presence of microbleeds in patients with PICH.

Conclusions  Primary intracerebral hemorrhage without microbleeds was more common in younger patients with precipitating events, whereas PICH with microbleeds was more common in elderly patients with prominent ischemic change and frequent use of antithrombotics or anticoagulants. Our findings might help to determine the pathogenetic type for secondary prevention.

From the Department of Neurology, Ilsan Paik Hospital, Inje University, Ilsan, Korea (Dr Jeong); Department of Neurology and Clinical Research Institute, Seoul National University Hospital, Seoul, Korea (Drs Jung, Chu, Lee, and Roh); and Department of Neurology, Eulji University School of Medicine, Seoul (Dr Bae).

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