What is Left Ventricular Concentric Remodeling?
Left ventricular concentric remodeling (LVCR) is a specific pattern of cardiac structural change characterized by increased left ventricular wall thickness with normal total LV mass, resulting in a relative wall thickness (RWT) greater than 0.42. 1
Definition and Diagnostic Criteria
LVCR represents an adaptive myocardial response where the heart's walls thicken without an overall increase in muscle mass. The key diagnostic features are:
- Normal LV mass (≤95 g/m² in women, ≤115 g/m² in men by linear measurements; ≤88 g/m² in women, ≤102 g/m² in men by 2D measurements) 1
- Increased relative wall thickness (RWT > 0.42), calculated as: (2 × posterior wall thickness) / (LV internal diameter at end-diastole) 1
- Normal or reduced chamber size 2
This distinguishes LVCR from other geometric patterns:
- Normal geometry: Normal wall thickness, normal LV mass, RWT ≤0.42
- Concentric hypertrophy: Increased wall thickness AND increased LV mass, RWT >0.42
- Eccentric hypertrophy: Increased chamber size AND increased LV mass, RWT ≤0.42 1, 2
Clinical Significance and Pathophysiology
LVCR represents a maladaptive structural response to various cardiovascular stressors. The thickened walls with preserved total mass indicate the ventricle is remodeling in response to pressure overload or volume depletion rather than true hypertrophy 3.
Functional Consequences
The presence of LVCR is associated with significant impairments in cardiac performance:
- Reduced exercise capacity and greater ventilatory inefficiency 4
- Subclinical systolic dysfunction (10-fold higher probability of left ventricular systolic dysfunction) 5
- Reduced stroke volume due to decreased end-diastolic volume 6
- Impaired cardiorespiratory fitness, with reduced peak VO₂ and oxygen pulse 6
Prognostic Implications
The clinical significance of LVCR varies by underlying condition. In aortic stenosis, LVCR portends the worst outcome among all geometric patterns (adjusted HR 3.53 for mortality under conservative management), even worse than concentric hypertrophy 7. However, in stable coronary artery disease, LVCR does not independently predict adverse cardiovascular events 8.
Associated Conditions and Risk Factors
LVCR develops in response to:
- Pressure overload states: Hypertension, aortic stenosis 3, 7
- Volume depletion: Low plasma volume (particularly after preeclampsia, OR 4.67) 3
- Inflammatory conditions: Psoriatic arthritis (58% prevalence vs 18% in controls) 5
- Environmental exposures: Deployment to combat zones with cardiotoxic airborne hazards 4
- Aging: Independent association with advancing age, particularly proportional geometric remodeling 9
Clinical Caveats
Important considerations when identifying LVCR:
- Serial measurements must use the same methodology and measure walls at the same ventricular level to ensure accuracy 1
- In asymmetric or localized hypertrophy, 3D echocardiography may be superior as it accommodates regional wall thickness differences 1
- Sex differences exist: Males have larger absolute dimensions, while age-related concentric remodeling occurs independently of sex 9
- Body size significantly affects measurements; patients at extremes of height or BSA may be misclassified 1
The presence of LVCR should prompt investigation for underlying causes and consideration of its functional impact, particularly in conditions like aortic stenosis where it carries significant prognostic weight.