[Effectiveness of Nao'an Capsule on stroke prevention among high risk population in Nanhui, Shanghai].
OBJECTIVE
To evaluate the effectiveness of stroke prevention among high risk population, using Nao'an Capsules.


METHODS
Participants were selected from 696,558 residents in Nanhui, using county of Shanghai city. Individuals aged 35 years old and over with at least one risk factor exposure to stroke, received cerebral vascular hemodynamic examination. 18,271 cases meeting the criteria of cerebral vascular hemodynamic indexes accumulative score below 70 points were defined as individuals with high-risk and targets to receive intervention. According to the willingness of the participants, 10,313 cases received Nao'an Capsules for intensive intervention based on general intervention measures compared to 7958 cases only receiving general intervention. After the implementation of intervention, incidence and mortality rates of stroke and the effectiveness of three-year intervention were studied.


RESULTS
Incidence of stroke in Nao'an Capsules group was significantly lower than that of the general intervention (P < 0.01) with 53.8% in males and 58.4% in females. The relative risk (RR) in two gender groups were 0.46 (0.33 - 0.64) and 0.39 (0.30 - 0.50) respectively. Multiple logistic regression analysis indicated that the history of hypertension, accumulative score of cerebral vascular hemodynamic indexes, age, gender and Nao'an Capsules intervention were the variables selected into the equation and significantly related to stroke. Among the variables, Nao'an Capsule was the strongest factor with a RR of 0.41.


CONCLUSIONS
Incidence of stroke in Nao'an Capsule intervention group was significantly lower than that in the general intervention group after 3 years of intervention, suggesting that Nao'an Capsule intervention was the strongest factor affecting stroke occurrence in individuals at high-risk.
Wang
Gui-qing
GQ
Shanghai Institute of Cerebral Vascular Disease Intervention and Cure, Shanghai 201318, China.
Huang
Jiu-yi
JY
Shen
Feng-ying
FY
Wang
Yan
Y
Cao
Yi-feng
YF
Guo
Ji-ping
JP
Yu
Xue-hai
XH
Mou
Wei-yan
WY
Wang
Su-chun
SC
Yang
Yong-ju
YJ
Lin
Jian-ming
JM
Fu
Guo-xin
GX
D000328:Adult; D000368:Aged; D002214:Capsules; D002681:China / Q000453:epidemiology; D004365:Drugs, Chinese Herbal / Q000627:therapeutic use*; D005260:Female; D006266:Health Education; D006801:Humans; D015994:Incidence; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D008517:Phytotherapy; D012307:Risk Factors; D020521:Stroke / Q000453:epidemiology / Q000517:prevention & control*
D002214:Capsules; D004365:Drugs, Chinese Herbal