Urinary albumin excretion in elderly patients with white coat hypertension.

The so-called white coat effect occurs in about 42% of elderly patients. This phenomenon leads to several problems in treatment and may also cause renal disease. One of the most frequently controlled parameters is microalbuminuria, an index of renal damage. The present case-control study intended to evaluate the urinary excretion of albumin in elderly patients suffering from white coat hypertension, and comparing their data to those of normotensive subjects. In addition, the study searched for correlations between albuminuria and various clinical and ambulatory blood pressure values. A total of 258 patients were enrolled, but after screening, only 129 were considered; 13 of the latter were further excluded because of problems encountered during ambulatory monitoring of arterial blood pressure. Therefore, 116 hypertensive subjects were included in the study. This pool of hypertensive patients was compared to a normotensive group of 33 subjects. The results have shown the occurrence of white coat effect in 25% of cases, and the microalbuminuria of these patients was statistically not significantly different from that of the normotensive group of patients. The microalbuminuria correlated only with ambulatory systolic blood pressure measured during the day.