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在美国,≥65岁的老人占总人口的百分数由1950年8.1%上升至1979年11.2%,即2千2百万,其中≥75岁者约5百万,女性寿命比男性长。≥55岁的主要死因依次为心脏病、癌和脑血管病。高血压是冠心病和脑血管病的重要危险因素,成为老年主要的健康问题。≥65岁的老年高血压,由于周围动脉阻力增加,通常是收缩和舒张压同时增高(≥160/90毫米汞柱);而单纯收缩压增高(收缩压≥160毫米汞柱,舒张压<90毫米汞柱),认为与(?)动脉血管壁僵硬有关。确定高血压(≥160/90毫米汞柱)和临界高血压(140-159/90-94毫米汞柱均随年龄而增加,分别涉及1/3的老人;两者占半数以上,约1千万老人。根根对45-75岁人群20年随访研究,血压正常者在各年龄组,不分性别危险性最低,临界高血压
In the United States, the percentage of elderly people aged 65 or over increased from 8.1% in 1950 to 11.2% in 1979, or 22 million, of which about 5 million were over 75 years of age. Women lived longer than men. The main causes of death at or above 55 were heart disease, cancer and cerebrovascular disease. Hypertension is an important risk factor for coronary heart disease and cerebrovascular disease and becomes a major health problem in the elderly. Elderly hypertension ≥ 65 years of age, due to increased peripheral arterial resistance, is usually accompanied by an increase in both systolic and diastolic blood pressure (≥ 160/90 mmHg); while simple systolic blood pressure (systolic blood pressure ≥ 160 mmHg, diastolic blood pressure <90 MmHg), and (?) Arterial wall stiffness. Hypertension (≥ 160/90 mm Hg) and critical hypertension (140-159 / 90-94 mm Hg) were confirmed to have increased with age, involving one-third of the elderly, respectively; both accounted for more than half, about one thousand Elderly people .Root root for 45-year-old population 20-year follow-up study, normal blood pressure in all age groups, regardless of gender, the lowest risk of critical hypertensive