• Paolo Palatini, Gianpaolo Reboldi, Lawrence J Beilin, Edoardo Casiglia, Kazuo Eguchi, Yutaka Imai, Kazuomi Kario, Takayoshi Ohkubo, Sante D Pierdomenico, Joseph E Schwartz, Lindon Wing, and Paolo Verdecchia.
• From the Department of Medicine, University of Padova, Padua, Italy (P.P., E.C.); Department of Medicine, University of Perugia, Perugia, Italy (G.R.); School of Medicine and Pharmacology, University of Western Australia, Perth, Australia (L.J.B.); Department of Medicine, Jichi University, Tochigi, Japan (K.E., K.K.); Department of Planning for Drug Development and Clinical Evaluation, Tohoku University, Sendai, Japan (Y.I., T.O.); Department of Hygiene and Public Health, Teikyo University School of Medicine, Tokyo, Japan (T.O.); Department of Medicine and Aging Science, University of Chieti, Chieti, Italy (S.D.P.); Division of General Medicine, Columbia University, New York, NY (J.E.S.); Department of Psychiatry, Stony Brook University, New York, NY (J.E.S.); School of Medicine, Flinders University, Adelaide, Australia (L.W.); and Unità operativa complessa di Medicina, Ospedale di Assisi, Italy (P.V.). palatini@unipd.it.
• Hypertension. 2014 Sep 1; 64 (3): 487-93.

AbstractThe association of ambulatory blood pressure (BP) variability with mortality and cardiovascular events is controversial. To investigate whether BP variability predicts cardiovascular events and mortality in hypertension, we analyzed 7112 untreated hypertensive participants (3996 men) aged 52±15 years enrolled in 6 prospective studies. Median follow-up was 5.5 years. SD of night-time BP was positively associated with age, body mass index, smoking, diabetes mellitus, and average night-time BP (all P<0.001). In a multivariable Cox model, night-time BP variability was an independent predictor of all-cause mortality (systolic, P<0.001/diastolic, P<0.0001), cardiovascular mortality (P=0.008/<0.0001), and cardiovascular events (P<0.001/<0.0001). In contrast, daytime BP variability was not an independent predictor of outcomes in any model. In fully adjusted models, a night-time systolic BP SD of ≥12.2 mm Hg was associated with a 41% greater risk of cardiovascular events, a 55% greater risk of cardiovascular death, and a 59% increased risk of all-cause mortality compared with an SD of <12.2 mm Hg. The corresponding values for a diastolic BP SD of ≥7.9 mm Hg were 48%, 132%, and 77%. The addition of night-time BP variability to fully adjusted models had a significant impact on risk reclassification and integrated discrimination for all outcomes (relative integrated discrimination improvement for systolic BP variability: 9% cardiovascular events, 14.5% all-cause death, 8.5% cardiovascular death, and for diastolic BP variability: 10% cardiovascular events, 19.1% all-cause death, 23% cardiovascular death, all P<0.01). Thus, addition of BP variability to models of long-term outcomes improved the ability to stratify appropriately patients with hypertension among risk categories defined by standard clinical and laboratory variables.© 2014 American Heart Association, Inc.

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