Prognostic significance of the white coat effect

Hypertension
P VerdecchiaC Porcellati

Abstract

The difference between clinic and ambulatory blood pressure (BP) has been used to quantify the pressure reactivity to the doctor's visit (white coat effect). We investigated the prognostic significance of the clinic-ambulatory BP difference in the setting of the Progetto Ipertensione Umbria Monitoraggio Ambulatoriale (PIUMA) study. A total of 1522 subjects contributed 6371 person-years of observation. All subjects had an initial off-therapy diagnostic workup including 24-hour noninvasive ambulatory BP monitoring. The predicted values of ambulatory BP progressively diverged from the identity line (white coat effect of 0 mm Hg) with increasing clinic BP, but the predicted values of clinic BP tended toward the identity line with increasing ambulatory BP. Hence, the clinic-ambulatory BP difference showed a direct association with clinic BP and an inverse association with ambulatory BP. Consequently, a high clinic-ambulatory BP difference predicted both a high clinic and a low ambulatory BP, whereas a low clinic-ambulatory BP difference predicted both a low clinic and a high ambulatory BP. The clinic-ambulatory BP difference showed also a direct association with age. During up to 9 years of follow-up (mean, 4.2 years), there were 15...Continue Reading

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