Abstract
Several studies demonstrated that visit-to-visit variability of blood pressure (BP) predicted future events of total death, stroke and cardiovascular disease. Little is known about factors associated with visit-to-visit BP variability in different countries. We recruited participants aged 40–59 years from four countries (Japan, the People’s Republic of China [PRC], the United Kingdom [UK] and the United States [US]). At each study visit, BP was measured twice by trained observers using random zero sphygmomanometers after five minutes resting. We defined visit-to-visit BP variability as variation independent of mean (VIM) by using average systolic BP of 1st and 2nd measurement across four study visits. Data on 4680 men and women were analyzed. Mean ± standard deviation of VIM values among participants in Japan, the PRC, the UK and the US were 5.44 ± 2.88, 6.85 ± 3.49, 5.65 ± 2.81 and 5.84 ± 3.01, respectively; VIM value in the PRC participants was significantly higher. Sensitivity analyses among participants without antihypertensive treatment or past history of cardiovascular disease yielded similar results. Higher VIM value was associated with older age, female gender, lower pulse rate and urinary sodium excretion and use of antihypertensive agents such as angiotensin converting enzyme inhibitors, beta blockers and calcium channel blockers. The difference of visit-to-visit BP variability between PRC and other countries remained significant after adjustment for possible confounding factors. In this large international study across four countries, visit-to-visit BP variability in the PRC was higher than in the other three countries. Reproducibility and mechanisms of these findings remain to be elucidated.
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Acknowledgements
This research was supported by Grant 2-RO1-HL50490-06 from the US National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD; by the Chicago Health Research Foundation; and by national agencies in PRC, Japan (the Ministry of Education, Science, Sports, and Culture, Grant-in-Aid for Scientific Research A090357003), and in the UK. PE is Director of the Medical Research Council-Public Health England (MRC-PHE) Center for Environment and Health and acknowledges support from the Medical Research Council and Public Health England (MR/L01341X/1). PE acknowledges support from the National Institute for Health Research (NIHR) Biomedical Research Center at Imperial College Healthcare NHS Trust and Imperial College London, and the NIHR Health Protection Research Unit in Health Impact of Environmental Hazards (HPRU-2012-10141). PE is a UK Dementia Research Institute (DRI) Professor, UK DRI at Imperial College London, funded by the MRC, Alzheimer’s Society and Alzheimer’s Research UK.
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Takashima, N., Ohkubo, T., Miura, K. et al. Factors associated with intra-individual visit-to-visit variability of blood pressure in four countries: the INTERMAP study. J Hum Hypertens 33, 229–236 (2019). https://doi.org/10.1038/s41371-018-0129-z
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DOI: https://doi.org/10.1038/s41371-018-0129-z
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