A new method for assessing 24-h blood pressure variability after excluding the contribution of nocturnal blood pressure fall

夜行的 医学 动态血压 血压 心脏病学 回廊的 内科学
作者
Grzegorz Bilo,Alessia Giglio,Katarzyna Styczkiewicz,Gianluca Caldara,A. Maronati,Kalina Kawecka‐Jaszcz,Giuseppe Mancia,Gianfranco Parati
出处
期刊:Journal of Hypertension [Lippincott Williams & Wilkins]
卷期号:25 (10): 2058-2066 被引量:230
标识
DOI:10.1097/hjh.0b013e32829c6a60
摘要

Objectives To assess quantitatively the relationship between nocturnal blood pressure (BP) fall and 24-h BP variability; to propose a new method for computing 24-h BP variability, devoid of the contribution from nocturnal BP fall; and to verify the clinical value of this method. Methods and results We analysed 3863 ambulatory BP recordings, and computed: (1) the standard deviation (SD) of 24-h BP directly from all individual readings and as a weighted mean of daytime and night-time SD (wSD); and (2) the size of nocturnal BP fall. Left ventricular mass index (LVMI) was assessed by echocardiography in 339 of the patients. The 24-h SD of BP was significantly greater than the 24-h wSD. Nocturnal BP fall was strongly and directly related to 24-h SD, the relationship with 24-h wSD being much weaker and inverse. The difference between SD and wSD was almost exclusively determined by the size of nocturnal BP fall. wSD of systolic BP was significantly related to LVMI, while 24-h SD was not. Conclusion Conventional 24-h SD of BP is markedly influenced by nocturnal BP fall. The weighted 24-h SD of BP removes the mathematical interference from night-time BP fall and correlates better with end-organ damage, therefore it may be considered as a simple index of 24-h BP variability superior to conventional 24-h SD.
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