Hypertension in African Americans with heart failure: progression from hypertrophy to dilatation; perhaps not

Area of Science:

• Cardiology
• Cardiovascular Research
• Hypertension Research

Background:

• Concentric hypertrophy is a common cardiac adaptation to long-standing hypertension (HTN).
• The transition of concentric hypertrophy to left ventricular (LV) dilatation and systolic failure is a presumed consequence of HTN.
• The routine occurrence of this transition in humans remains uncertain.

Purpose of the Study:

• To investigate the progression of hypertensive heart disease in African American patients.
• To determine if concentric hypertrophy consistently leads to LV dilatation and systolic failure in the context of HTN.
• To explore factors influencing individual responses to chronic hypertension.

Main Methods:

• Retrospective study of African American patients hospitalized for acute decompensated heart failure (HF) with a history of HTN and no obstructive coronary disease.
• Patients categorized into groups with normal and reduced left ventricular ejection fraction (LVEF).
• Left ventricular (LV) dimensions and mass were measured using established echocardiographic guidelines and formulas.

Main Results:

• Patients with normal LVEF HF were older, predominantly female, and had longer HTN duration with higher admission systolic blood pressure.
• Both groups exhibited elevated LV wall thickness; LV mass was significantly greater in the reduced LVEF HF group.
• Female gender independently predicted LV wall thickness in the normal LVEF HF group.

Conclusions:

• The study challenges the traditional view that concentric hypertrophy invariably progresses to LV dilatation and systolic failure in hypertensive patients.
• Genetic factors and gender significantly influence the cardiac remodeling response to long-standing hypertension.
• Individual variability in response to HTN warrants further investigation in diverse populations.