How common is isolated nocturnal hypertension?

The growing use of methods to measure blood pressure (BP) under everyday life conditions in ‘out-of-office’ settings, through either 24-h ambulatory BP monitoring (ABPM) or home BP monitoring (HBPM), for defining BP status has led to identification of four specific hypertension phenotypes, characterized by variable agreement or disagreement between office BP (OBP) and out-of-office BP: true normotension (normal office and out-of-office BP), sustained hypertension (both elevated office and out-of-office BP), masked hypertension (normal office BP and out-of-office BP), and white-coat hypertension (WCH), when OBP is elevated, but out-of-office BP levels are within normal limits. The term ‘white-coat hypertension’ is probably a misnomer and a misconception, because it does not necessarily reflect, or at most partially, an alerting reaction or white-coat effect. However, the suggestion to use the term ‘isolated office hypertension’ instead of the more appealing ‘white coat hypertension’ has not gained popularity in clinical practice.