Document Detail

White-coat hypertension: a selection bias? Harvest Study Investigators. Hypertension and Ambulatory Recording Venetia Study.
MedLine Citation:
PMID:  9794738     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Results of several studies have shown that subjects with white-coat hypertension (WCH) have more target-organ damage than do normotensive controls with similar ambulatory blood pressures. OBJECTIVE: To investigate whether this is due to a selection bias. SETTING: Seventeen hypertension clinics in northeast Italy. MAIN OUTCOME MEASURES: Echocardiographic data in relation to WCH status. PATIENTS AND METHODS: Mild hypertensive subjects from the HARVEST (n = 565) who underwent two ambulatory blood pressure monitorings 3 months apart and M-mode echocardiography, and 95 normotensive control subjects. RESULTS: From first ambulatory monitoring, 90 hypertensive subjects were classified as having WCH (mean daytime blood pressure < 130/80 mmHg). Their 24 h blood pressure was similar to that of the normotensive subjects, but their left ventricular mass index was greater. From second ambulatory monitoring, only 38 of the 90 subjects still had WCH, whereas 24 h blood pressure in the other 52 had risen beyond the limit of WCH. Left ventricular mass index (89.2 +/- 2.4 g/m2), wall thickness (18.1 +/- 0.3 mm), and relative wall thickness (0.359 +/- 0.006%) of the 38 subjects with WCH at both recordings were still greater than those of the normotensive subjects (82.4 +/- 1.5 g/m2, P = 0.02; 17.2 +/- 0.2 mm, P = 0.002; and 0.337 +/- 0.004%, P = 0.025) and similar to those of the 52 subjects who no longer had WCH (88.5 +/- 2.0 g/m2, 18.7 +/- 0.2 mm, and 0.375 +/- 0.005%, all NS). CONCLUSIONS: Owing to regression toward the mean, over 50% of the subjects with WCH could no longer be classified as such from repeated ambulatory monitoring, indicating that the current diagnosis of WCH is subject to selection bias. Cardiac remodeling was present also in the subjects confirmed to have WCH by repeated blood pressure recording, suggesting that the effect of WCH has an actual impact on target organs.
P Palatini; F Dorigatti; E Roman; P Giovinazzo; D Piccolo; G De Venuto; M Mattarei; E Cozzutti; S Gregori; P Mormino; A C Pessina
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of hypertension     Volume:  16     ISSN:  0263-6352     ISO Abbreviation:  J. Hypertens.     Publication Date:  1998 Jul 
Date Detail:
Created Date:  1998-11-20     Completed Date:  1998-11-20     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8306882     Medline TA:  J Hypertens     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  977-84     Citation Subset:  IM    
Clinica Medica 1, University of Padova, Italy.
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MeSH Terms
Bias (Epidemiology)
Blood Pressure Monitoring, Ambulatory
Cardiovascular Diseases / etiology
Case-Control Studies
Heart Ventricles / ultrasonography
Hypertension / complications,  diagnosis*,  physiopathology*
Middle Aged
Patient Selection
Comment In:
J Hypertens. 1999 Jan;17(1):148-9   [PMID:  10100108 ]

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