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美国在1968年至1976年之间,缺血性心脏病适龄死亡率减少了21%,在同时期内“主要心血管病”的各种病症的死亡率也在减少。缺血性心脏病死亡率的降低包括青、老年男、女以及白种人和非白种人,尤以非白种女性减少最大——28%。据调查,美国冠状动脉旁路手术的数量有大量增多,但数量有限,在改善总死亡率方面仅能起微小作用。对护理工作与死亡率间关系的观察亦未获得正结
The United States had a 21% reduction in age-related mortality from ischemic heart disease between 1968 and 1976, and a decrease in mortality for various “major cardiovascular disease” conditions over the same period. The reductions in ischemic heart disease mortality include young, older men and women, and Caucasian and non-Caucasian individuals, especially in non-white women, with a 28% decrease. According to the survey, there is a large increase in the number of coronary artery bypass surgery in the United States, but the number is limited, and it can only play a minor role in improving the overall mortality rate. The observation of the relationship between nursing work and death rate also failed to reach a positive conclusion