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Twenty‐four hour ambulatory blood pressure in the population
Author(s) -
NYSTRÖM F.,
MALMSTRÖM O.,
KARLBERG B. E.,
ÖHMAN K. P.
Publication year - 1996
Publication title -
journal of internal medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.625
H-Index - 160
eISSN - 1365-2796
pISSN - 0954-6820
DOI - 10.1046/j.1365-2796.1996.322856000.x
Subject(s) - medicine , dipper , blood pressure , supine position , ambulatory blood pressure , population , ambulatory , confidence interval , white coat hypertension , cardiology , environmental health
Objectives. To establish a population‐based 24‐h ambulatory blood pressure (ABP) reference material with day/night mean BP calculated by standardized and true bedtimes. Design. A cross‐sectional study of 200 randomly selected subjects (20 men and 20 women in each 10‐year age interval 20–70 years) in Linköping, Sweden. Setting. University Hospital of Linköping, Sweden. Results. Participation rate was 67%. Mean supine clinic BP (CBP) and 24‐h‐ABP values for the whole material were 123±13/79±8 mmHg and 120± 10/73±7 mmHg, respectively. White coat BP phenomenon increased with age (systolic CBP/ABP ratio versus age, r =0.35, P <0.0001). Seventeen participants had a night/day mean arterial blood pressure ratio >0.9 (non‐dipper) when calculated from their own time‐notations. If standardized day (06.00–23.00) and night (23.00–06.00) limits were used, 24 subjects were non‐dippers. Of these, only eight were ‘true’. ‘True’ non‐dippers had a similar day‐time mean arterial ABP as ‘true’ dippers (92.4±11 mmHg versus 91.9±13 mmHg, P = 0.92) while night‐time BP was higher (89.9± 13 mmHg versus 74.1±7 mmHg, P <0.0001). Conclusion. Population‐based ABP reference values have been defined. We found 9% non‐dippers and that standardized day/night‐time limits may lead to misclassification. This could be due to gender‐ and age‐differences in sleeping habits, which was also shown in this study. The frequency of white coat BP phenomenon increases with age.