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—Controversy remains on whether white coat hypertension is a benign clinical condition or carries an increased risk of target-organ damage. Nine hundred forty-two stage I hypertensive subjects enrolled in the HARVEST trial underwent 24-hour ambulatory blood pressure monitoring and urine collection for albumin measurement. Reliable echocardiographic data were obtained in 722 subjects. White coat hypertensive subjects were defined on the basis of three different partition values: mean daytime blood pressure &lt;130/90 mm Hg, &lt;135/85 mm Hg, or &lt;140/90 mm Hg. Ninety-five normotensive subjects with similar age and sex distribution were studied as controls. With all threshold levels, left ventricular mass index and wall thicknesses were greater in the sustained hypertensive subjects than in the white coat hypertensive subjects, also when these differences were adjusted for blood pressure readings taken in the office. Relative wall thickness was similar in the two hypertensive groups. All echocardiographic dimensional data were greater in the white coat hypertensive subjects than in the normotensive subjects. Urinary albumin and the prevalence of microalbuminuria were also greater in the sustained hypertensive subjects than in the white coat hypertensive subjects. No significant differences in urinary albumin were found between the white coat hypertensive and the normotensive subjects. These results show that within a population of subjects with stage I hypertension, subjects with white coat hypertension have a smaller degree of hypertensive complications than those with sustained hypertension, irrespective of their blood pressure levels taken in the office. However, in comparison with normotensive subjects, white coat hypertensive subjects seem to be at greater risk. Cardiac involvement seems to precede glomerular damage in the early stage of hypertension.

Target-Organ Damage in Stage I Hypertensive Subjects With White Coat and Sustained Hypertension