WHITE-COAT EFFECT AND MASKED HYPERTENSION IN HIGH-NORMAL OFFICE BLOOD PRESSURE: RESULTS OF THE HUNGARIAN ABPM REGISTRY

Abstract

Objective: White-coat hypertension refers to the untreated condition in which BP is elevated in the office but is normal when measured by ambulatory blood pressure monitoring (ABPM), home blood pressure monitoring (HBPM) or both. However, white-coat effect can be present in high-normal blood pressure (BP) category as well. The aims of this study were to evaluate the presence of white-coat effect and masked hypertension in high-normal office BP (OBP) and also to explore the prevalence of untreated very high CV risk (CVD) patients with high-normal OBP. Design and method: Data of the Hungarian ABPM Registry were used in our analysis. Results: From 14 817 uploaded ABPM curves with clinical data 1 255 subjects were categorized as having high-normal OBP. 999 (79.6%) were on antihypertensive treatment. Based on the ABPM recordings apparent high-normal BP was found in 35.9% (n=450), white-coat effect was present in 28.5% (n=358) and masked hypertension was diagnosed in 35.6% (n=447). Similar results were found in treated and untreated subjects as well. Independent predictors of white-coat effect were age (OR: 1.014 (95%CI:1.006-1.023), p=0.001), male sex (OR: 0.565 (0.432-0.739), p<0.001), and obesity (OR: 1.994 (1.480-2.687), p<0.001). Independent predictors of masked hypertension were age (OR: 1.014 (95%CI:1.005-1.023), p=0.003), heart rate (OR: 1.028 (1.011-1.044), p=0.01) and obesity (OR:1.679 (1.262-2.234), p<0.001). 142 subjects had very high CV risk with high-normal OBP and only 7 of them were untreated. With ABPM only one of them had apparent high-normal BP. Conclusions: In high-normal OBP ABPM is a useful tool to diagnose white-coat effect and masked hypertension. Untreated high-normal OBP with very high CV risk is a very rare condition in the general practitioner practice when ABPM is also recommended to evaluate the true blood pressure phenotype before therapeutic decisions.