临界性高血压(亦称边缘性高血压)处于正常血压与确定性高血压之间。成人正常血压是140/90毫米汞柱以下,确定性高血压是160/95毫米汞柱以上,临界性高血压则在140～160/90～95毫米汞柱之间。临界性高血压并不是无害的,长期随诊结果总死亡率远远超过同年龄正常人,并且易发展成为确定性高血压。临界性高血压如果1年内血压升高10毫米汞柱或 Critical hypertension (also known as borderline hypertension) is between normal and deterministic hypertension. Adult normotensive blood pressure is below 140/90 mmHg, deterministic hypertension is above 160/95 mmHg, and critical hypertension is between 140-160/90 and 95 mmHg. Critical hypertension is not harmless, and long-term follow-up results in a far greater total mortality than normal people of the same age and is prone to develop definite hypertension. Critical hypertension If the blood pressure within a year 10 mm Hg or