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Prognostic impact of systolic blood pressure variability in people with diabetes
Univ Sydney, Sydney Sch Publ Hlth, Sydney, NSW, Australia.
Univ Sydney, Sch Math & Stat, Sydney, NSW, Australia.
Lund Univ, Dept Clin Sci, Univ Hosp, Malmö, Sweden.
UTS, Australian Ctr Publ & Populat Hlth Res, Sydney, NSW, Australia.
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2018 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 13, no 4, article id e0194084Article in journal (Refereed) Published
Abstract [en]

Objective: Blood pressure variability (BPV) has been associated with risk of cardiovascular events in observational studies, independently of mean BP levels. In states with higher autonomic imbalance, such as in diabetes, the importance of BP variability may theoretically be even greater. We aimed to investigate the incremental value of BPV for prediction of cardiovascular and all-cause mortality in patients with type 2 diabetes.

Methods: We identified 9,855 patients without pre-existing cardiovascular disease who did not change BP-lowering treatment during the observation period from a Swedish primary health care cohort of patients with type 2 diabetes. BPV was summarized as the standard deviation (SD), coefficient of variation (CV), or variation independent of mean (VIM). Patients were followed for a median of 4 years and associations with cardiovascular and all-cause mortality were investigated using Cox proportional hazards models.

Results: BPV was not associated with cardiovascular specific or all-cause mortality in the total sample. In patients who were not on BP-lowering drugs during the observation period (n = 2,949), variability measures were associated with all-cause mortality: hazard ratios were 1.05, 1.04 and 1.05 for 50% increases in SD, CV and VIM, respectively, adjusted for Framingham risk score risk factors, including mean BP. However, the addition of the variability measures in this subgroup only led to very minimal improvement in discrimination, indicating they may have limited clinical usefulness (change in C-statistic ranged from 0.000–0.003 in all models).

Conclusions: Although BPV was independently associated with all-cause mortality in diabetes patients in primary care who did not have pre-existing cardiovascular disease or BP-lowering drugs, it may be of minimal clinical usefulness above and beyond that of other routinely measured predictors, including mean BP.

Place, publisher, year, edition, pages
2018. Vol. 13, no 4, article id e0194084
National Category
Endocrinology and Diabetes Cardiac and Cardiovascular Systems
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URN: urn:nbn:se:uu:diva-355683DOI: 10.1371/journal.pone.0194084ISI: 000429742900023PubMedID: 29641538OAI: oai:DiVA.org:uu-355683DiVA, id: diva2:1230377
Available from: 2018-07-03 Created: 2018-07-03 Last updated: 2018-07-03Bibliographically approved

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