Potential triggering factors of intracerebral hemorrhage.

The distributions of intracerebral hemorrhage (ICH) according to place of onset, degree of physical activity at onset and potential triggering factors were analyzed in 848 patients with ICH. Patients were grouped according to the presumed cause of ICH: hypertensive ICH, secondary ICH and ICH of undetermined origin. The influence of demographic and temporal factors on the relative frequency of events was also assessed. In 30% of the cases, ICH occurred during inactivity or sedentary activity, in 50% during light exertion and in 20% during moderate/vigorous exertion. During inactivity or sedentary activity, hypertensive ICH was significantly less frequent than secondary ICH (OR 0.32; 95% CI 0.21-0.47) and undetermined ICH (OR 0.36; 95% CI 0.23-0.55), whereas during moderate or vigorous exertion hypertensive ICH was more frequent than secondary (OR 1.88; 95% CI 1.16-3.05) and undetermined ICH (OR 2.29; 95% CI 1.31-4.00) Potential triggering factors were observed in 27% of patients and were significantly more frequent in patients with hypertensive ICH than in patients with secondary ICH (OR 2.90; 95% CI 1.85-4.54) or undetermined ICH (OR 2.44; 95% CI 1.54-3.87). Our findings suggest that many potential external triggers that act mainly by raising blood pressure may interact, and their concurrence may favor cerebral hemorrhage, particularly in hypertensive patients. In many cases, these circumstances of increased risk may be mitigated by preventive measures. Copyright 2001 S. Karger AG, Basel