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Prognostic impact from clinic, daytime, and night-time systolic blood pressure in nine cohorts of 13 844 patients with hypertension

Roush, George C.a; Fagard, Robert H.b; Salles, Gil F.c; Pierdomenico, Sante D.d; Reboldi, Gianpaoloe; Verdecchia, Paolof; Eguchi, Kazuog; Kario, Kazuomig; Hoshide, Satoshig; Polonia, Jorgeh; de la Sierra, Alejandroi; Hermida, Ramon C.j; Dolan, Eamonk; Zamalloa, HernanaThe ABC-H Investigators

doi: 10.1097/HJH.0000000000000355
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Background and method: To determine which SBP measure best predicts cardiovascular events (CVEs) independently, a systematic review was conducted for cohorts with all patients diagnosed with hypertension, 1+ years follow-up, and coronary artery disease and stroke outcomes. Lead investigators provided ad hoc analyses for each cohort. Meta-analyses gave hazard ratios from clinic SBP (CSBP), daytime SBP (DSBP), and night-time SBP (NSBP). Coefficients of variation of SBP measured dispersion. Nine cohorts (n = 13 844) were from Europe, Brazil, and Japan. For sleep–wake SBP classification, seven cohorts used patient-specific information.

Results: Overall, NSBP's dispersion exceeded DSBP's dispersion by 22.6% with nonoverlapping confidence limits. Within all nine cohorts, dispersion for NSBP exceeded that for CSBP and DSBP. For each comparison, P = 0.004 that this occurred by chance. Considered individually, increases in NSBP, DSBP, and CSBP each predicted CVEs: hazard ratios (95% confidence intervals) = 1.25 (1.22–1.29), 1.20 (1.15–1.26), and 1.11 (1.06–1.16), respectively. However, after simultaneous adjustment for all three SBPs, hazard ratios were 1.26 (1.20–1.31), 1.01 (0.94–1.08), and 1.00 (0.95–1.05), respectively. Cohorts with baseline antihypertensive treatment and cohorts with patient-specific information for night–day BP classification gave similar results. Within most cohorts, simultaneously adjusted hazard ratios were greater for NSBP than for DSBP and CSBP: P = 0.023 and 0.012, respectively, that this occurred by chance.

Conclusion: In hypertensive patients, NSBP had greater dispersion than DSBP and CSBP in all cohorts. On simultaneous adjustment, compared with DSBP and CSBP, increased NSBP independently predicted higher CVEs in most cohorts, and, overall, NSBP independently predicted CVEs, whereas CSBP and DSBP lost their predictive ability entirely.

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aUCONN School of Medicine, Farmington, Connecticut, USA

bHypertension Unit, U.Z., University of Leuven, Leuven, Belgium

cFaculdade de Medicina, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil

dDipartimento di Medicina e Scienze dell’Invecchiamento, Universita Gabriele d’Annunzio, Chieti

eDepartment of Internal Medicine, University of Perugia, Perugia

fStruttura Complessa di Medicina, Ospedale di Assisi, Assisi, Italy

gJichi Medical University School of Medicine, Shimotsuke, Tochigi Prefecture, Japan

hFaculdade de Medicine da Universidade do Porto, Porto, Portugal

iDepartment of Internal Medicine, Hospital Mutua Terrassa, University of Barcelona, Terrassa

jBioengineering and Chronobiology Laboratories, University of Vigo, Vigo, Spain

kCambridge University Hospitals NHS Foundation Trust, Addenbrooke's Hospital, Cambridge, UK

Correspondence to George C. Roush, ABC-H, UCONN School of Medicine, St. Vincent's Medical Center, 2800 Main Street, Bridgeport, Connecticut, USA. Tel: +1 203 622 3033; fax: +1 203 625 9556; e mail: groush@gcr0.com

Abbreviations: BP, blood pressure; CI, confidence interval; CSBP, clinic SBP; CVE, cardiovascular event; DSBP, daytime SBP; NSBP, night-time SBP

Received 8 May, 2014

Revised 17 July, 2014

Accepted 17 July, 2014

Supplemental digital content is available for this article. Direct URL citations appear in the printed text and are provided in the HTML and PDF versions of this article on the journal's Website (http://www.jhypertension.com).

© 2014 Wolters Kluwer Health | Lippincott Williams & Wilkins