[Study on the timing of cerebral hemorrhage attacks]

This study sought to disclose the circadian rhythmicity of cerebral hemorrhage attacks. We defined every two hours as a period of time from zero hour, investigated the attacks of 364 cerebral hemorrhage patients in each period, and analyzed the attack time, the sites of hemorrhage, the presence or absence of hypertension and the relevant treatments. The results revealed an obvious time difference of cerebral hemorrhage attacks with the peak time of incidence in the 6:00-12:00 periods, the medium in the 16:00-18:00 periods, the lowest in the 22:00-6:00 periods. The sites of cerebral hemorrhage were found to be related with the attack time. The peak time of cerebral hemorrhage in basalganglia was seen in the 8:00-12:00 periods and that of cerebral hemorrhage in non-basalganglia in the 16:00-20:00 periods. The variable about hypertension and relevant treatment was also found to be closely related to the attack time of cerebral hemorrhage. The patients who had contracted hypertension and had not been treated were liable to have hemorrhage attack in the 16:00-20:00 periods, but those who had been treated or had normal blood pressure usually had attacks in the 8:00-12:00 periods. In conclusion, cerebral hemorrhage attack is periodic. The attack time is closely related to the sites of cerebral hemorrhage, the presence or absence of hypertension and the relevant treatment.