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Prognostic significance of left ventricular mass change during treatment of hypertension
Richard B Devereux1, Kristian Wachtell, Eva Gerdts
1Department of Medicine, New York Presbyterian Hospital, Cornell Medical Center, New York, NY 10021, USA. rbdevere@med.cornell.edu
Insights
Lowering left ventricular (LV) mass during hypertension treatment significantly reduces cardiovascular events, independent of blood pressure changes. This finding highlights LV mass as a crucial therapeutic target for better hypertension outcomes.
Area of Science:
- Cardiology
- Hypertension Research
- Clinical Trials
Background:
- Elevated baseline left ventricular (LV) mass is a known predictor of cardiovascular (CV) complications in hypertension.
- The impact of LV mass reduction on CV outcomes during antihypertensive therapy remains unclear.
Purpose of the Study:
- To investigate if reducing LV mass during antihypertensive treatment independently modifies the risk of major CV events.
- To assess the relationship between LV mass reduction and CV event rates beyond blood pressure changes.
Main Methods:
- Prospective cohort substudy of the Losartan Intervention For Endpoint Reduction in Hypertension (LIFE) trial.
- 941 hypertensive patients with LV hypertrophy underwent echocardiography for LV mass measurement.
- Patients were followed for a mean of 4.8 years for major CV events.
Main Results:
- Lower in-treatment LV mass index was strongly associated with a reduced rate of composite CV end points (CV death, myocardial infarction, stroke).
- This association persisted independently of blood pressure reduction and assigned treatment.
- Significant reductions were observed for CV mortality, stroke, and all-cause mortality with lower LV mass.
Conclusions:
- In hypertensive patients with LV hypertrophy, reduced LV mass during treatment is linked to lower clinical event rates.
- LV mass reduction offers prognostic benefits beyond blood pressure lowering and treatment type.
- Targeting LV mass may be a valuable strategy in managing hypertension and its CV complications.
Context:
Increased baseline left ventricular (LV) mass predicts cardiovascular (CV) complications of hypertension, but the relation between lower LV mass and outcome during treatment for hypertension is uncertain.
Objective:
To determine whether reduction of LV mass during antihypertensive treatment modifies risk of major CV events independent of blood pressure change.
Design, Setting, And Participants:
Prospective cohort substudy of the Losartan Intervention For Endpoint Reduction in Hypertension (LIFE) randomized clinical trial, conducted from 1995 to 2001. A total of 941 prospectively identified patients aged 55 to 80 years with essential hypertension and electrocardiographic LV hypertrophy had LV mass measured by echocardiography at enrollment in the LIFE trial and thereafter were followed up annually for a mean (SD) of 4.8 (1.0) years for CV events.
Main Outcome Measures:
Composite end point of CV death, fatal or nonfatal myocardial infarction, and fatal or nonfatal stroke.
Results:
The composite end point occurred in 104 patients (11%). The multivariable Cox regression model showed a strong association between lower in-treatment LV mass index and reduced rate of the composite CV end point (hazard ratio [HR], 0.78 per 1-SD (25.3) decrease in LV mass index; 95% confidence interval [CI], 0.65-0.94; P = .009) over and above that predicted by reduction in blood pressure. There were parallel associations between lower in-treatment LV mass index and lower CV mortality (HR, 0.62; 95% CI, 0.47-0.82; P = .001), stroke (HR, 0.76; 95% CI, 0.60-0.96; P = .02), myocardial infarction (HR, 0.85; 95% CI, 0.62-1.17, P = .33), and all-cause mortality (HR, 0.72; 95% CI, 0.59-0.88, P = .002), independent of systolic blood pressure and assigned treatment. Results were confirmed in analyses adjusting for additional CV risk factors, electrocardiographic changes, or when only considering events after the first year of study treatment.
Conclusion:
In patients with essential hypertension and baseline electrocardiographic LV hypertrophy, lower LV mass during antihypertensive treatment is associated with lower rates of clinical end points, additional to effects of blood pressure lowering and treatment modality.
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