What are the differences between concentric and eccentric left ventricular hypertrophy, including their etiologies, clinical characteristics, and recommended management?

Concentric versus Eccentric Left Ventricular Hypertrophy

Concentric LVH results from pressure overload (hypertension, aortic stenosis) and carries worse cardiovascular prognosis than eccentric LVH, which results from volume overload (valvular regurgitation, high cardiac output states). 1

Key Structural and Hemodynamic Differences

Concentric LVH

• Etiology: Adaptive response to chronic pressure overload from hypertension or aortic stenosis with elevated peripheral resistance 1
• Echocardiographic features:
  • Normal or small LV cavity size
  • Uniformly increased wall thickness
  • Increased LV mass
  • Increased relative wall thickness (RWT >0.42) 1
• Hemodynamics: High systemic pressure, elevated peripheral resistance, normal stroke volume 2
• Neurohormonal profile: Elevated plasma renin and natriuretic peptide levels 2

Eccentric LVH

• Etiology: Volume overload from significant valvular regurgitation or high cardiac index (seen in athletes) 1
• Echocardiographic features:
  • Increased LV cavity size
  • Normal LV wall thickness
  • Increased LV mass
  • Normal or low RWT (≤0.42) 1
• Hemodynamics: Normal systemic pressure, low peripheral resistance, increased stroke volume, spheric LV geometry 2
• Neurohormonal profile: Low serum renin, enhanced sympathetic nervous activity 2
• Systolic function: Low-normal or mildly impaired due to chronic volume overload 1

Clinical Significance and Prognosis

Concentric LVH confers the highest cardiovascular risk among LVH patterns. 3 In a 10-year observational study of 690 hypertensive patients, concentric hypertrophy was associated with worse outcomes than eccentric hypertrophy, with relative wall thickness providing linear prediction of all-cause mortality and composite endpoints 3.

Risk Stratification by LVH Pattern

Recent evidence supports a four-tiered classification that accounts for both LV dilatation and concentricity 4, 5:

1. Concentric dilated LVH (increased mass/volume ratio AND increased end-diastolic volume): Highest risk
2. Concentric nondilated LVH (increased mass/volume ratio, normal volume): High risk
3. Eccentric dilated LVH (increased volume, normal mass/volume ratio): High risk
4. Eccentric nondilated LVH (normal mass/volume ratio and volume): Similar risk to normal LV mass 5

This refined classification is critical because eccentric nondilated LVH represents a low-risk subset that was previously grouped with higher-risk eccentric patterns 5. In the LIFE echocardiography substudy of 939 hypertensive patients followed for 4.8 years, eccentric nondilated LVH had no increased risk of all-cause mortality or cardiovascular events compared to normal LV mass 5.

Cardiac Magnetic Resonance Findings

In the UK Biobank imaging cohort (24,463 hypertensives), eccentric LVH demonstrated the most impaired LV function with 2.5 times higher MACE rates and 9 times higher heart failure rates, while concentric LVH showed 4.1 times higher heart failure rates but no association with MACE 6.

Management Approach

Blood Pressure Control

Intensive blood pressure control is the cornerstone of management for both patterns, as LVH regression predicts cardiovascular risk reduction independent of BP change 7. The 2017 ACC/AHA guidelines recommend:

• BP target <130/80 mmHg for patients with LVH and 10-year ASCVD risk ≥10% 7
• BP target <140/90 mmHg for those with <10% ASCVD risk 7

Pharmacological Considerations

Antihypertensive drug selection should be guided by LVH geometry 2:

• Concentric LVH: Responds substantially to angiotensin II antagonists (losartan) due to elevated renin profile 2
• Eccentric LVH: Refractory to both losartan and atenolol; requires alternative strategies targeting volume overload and underlying valvular pathology 2

Diagnostic Assessment

Echocardiography is the primary modality for LVH assessment, though not universally recommended 7. Assessment is most useful in:

• Young patients (≤18 years)
• Secondary hypertension
• Chronic uncontrolled hypertension
• Symptoms of heart failure 7

Key measurements 1:

• LV mass indexed to body surface area (men: >115 g/m², women: >95 g/m²)
• Relative wall thickness: 2 × posterior wall thickness / LV diastolic diameter
• Normal RWT: 0.32-0.42 1

Common Pitfalls

1. Do not assume all eccentric LVH carries equal risk: Distinguish dilated from nondilated patterns 5
2. Electrocardiographic LVH correlates poorly with imaging: ECG has limited sensitivity but retains prognostic value 7
3. Consider comorbidities: Obesity, diabetes, and metabolic syndrome increase LV mass and RWT independent of BP 1
4. Address underlying causes: In eccentric LVH, evaluate for valvular regurgitation requiring surgical intervention 1

Monitoring and Regression

LVH regression is achievable and prognostically beneficial 7. Serial echocardiography should assess:

• Changes in LV mass
• Evolution of geometric pattern
• Development of systolic or diastolic dysfunction
• Left atrial enlargement (precursor to atrial fibrillation and HFpEF) 7

Both functional changes (diastolic dysfunction, longitudinal/radial myocardial dysfunction, atrial enlargement) occur similarly in concentric and eccentric LVH 1, emphasizing the need for comprehensive assessment beyond geometric classification alone.