Relationship between blood pressure variability and blood pressure phenotypes: a home blood pressure monitoring study.

Objective: Home blood pressure (BP) variability (BPV) and BP phenotypes such as white-coat hypertension (WCH), white-coat uncontrolled hypertension (WUCH), masked hypertension (MH) and masked uncontrolled hypertension (MUCH) are predictors of adverse cardiovascular events. This study compared home BPV across BP phenotypes built from abnormal office BP (OBP) and home BP monitoring (HBPM) thresholds defined by three distinct societies [European Society of Hypertension (ESH): OBP ≥ 140/90 mmHg and HBPM ≥ 135/85 mmHg; American College of Cardiology/American Heart Association (ACC/AHA): OBP and HBPM ≥ 130/80 mmHg and Brazilian Society of Cardiology (BSC): OBP ≥ 140/90 mmHg and HBPM ≥ 130/80 mmHg].

Methods: This cross-sectional study evaluated 51 194 treated (37% men, age = 61 ± 15 years) and 56 100 untreated (41% men, age = 54 ± 16 years) individuals from 1045 Brazilian centers who underwent OBP and HBPM measurements. Systolic and diastolic home BPV were estimated as the: standard deviation, coefficient of variation, and the variability independent of the mean of HBPM.

Results: Results of adjusted analysis showed that home BPV parameters were significantly greater in individuals with WCH/WUCH according to the BSC criteria, in those with MH/MUCH defined by the ACC/AHA criteria, and tended to be greater in individuals with either MH/MUCH or WCH/WUCH defined by the ESH criteria.Furthermore, restricted cubic spline analysis showed a U-shaped association between BPV and the difference between OBP and HBPM in treated and untreated individuals.

Conclusion: Home BPV was greater in WCH/WUCH and/or MH/MUCH depending on the criteria used to define abnormal OBP and HBPM thresholds. These findings underscore the need to standardize abnormal BP criteria in clinical practice.