Nocturnal hypertension defined by fixed cut-off limits is a better predictor of left ventricular hypertrophy than...

Area of Science:

• Cardiology
• Hypertension Research
• Diagnostic Predictors

Background:

• Nocturnal hypertension classification lacks reproducibility, particularly the non-dipping (systolic blood pressure fall <10%) method.
• Fixed cut-off limits for nocturnal blood pressure (mean >120/70 mm Hg) offer a potentially more stable classification.
• Left ventricular hypertrophy (LVH) is a significant indicator of cardiovascular disease.

Purpose of the Study:

• To evaluate if fixed cut-off limits for nocturnal hypertension are superior predictors of left ventricular hypertrophy compared to the non-dipping classification.
• To compare the predictive value of two distinct definitions of nocturnal hypertension for LVH.

Main Methods:

• Utilized 24-hour ambulatory blood pressure monitoring in 223 subjects.
• Performed echocardiography to assess left ventricular hypertrophy.
• Employed logistic regression analysis to determine the predictive significance of nocturnal hypertension definitions for LVH.

Main Results:

• Nocturnal hypertension defined by fixed cut-off limits significantly predicted LVH (Odds Ratio=11.1, 95% Confidence Interval=3.0-40.1).
• The non-dipping classification did not show a significant association with LVH (Odds Ratio=1.4, 95% Confidence Interval=0.4-5.5).
• No interaction was observed between the two classification methods (p<0.3).

Conclusions:

• Fixed cut-off values for defining nocturnal hypertension are more effective predictors of left ventricular hypertrophy than the non-dipping criterion.
• This suggests a more reliable method for identifying individuals at risk for cardiac structural changes associated with hypertension.