Can thyroid dysfunction cause left ventricular hypertrophy (LVH)?

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Last updated: September 4, 2025 • View editorial policy

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Thyroid Dysfunction and Left Ventricular Hypertrophy

Yes, both hyperthyroidism and hypothyroidism can cause left ventricular hypertrophy (LVH) through different pathophysiological mechanisms, with hyperthyroidism having stronger evidence for this relationship.

Pathophysiological Mechanisms

Hyperthyroidism and LVH

  • Hemodynamic Effects: Hyperthyroidism causes decreased systemic vascular resistance, increased resting heart rate, increased LV contractility, and enhanced ventricular relaxation 1
  • Volume Overload: Hyperthyroidism activates the renin-angiotensin-aldosterone system, leading to sodium retention and increased blood volume (up to 25% increase) 1
  • Direct Myocardial Effects: Thyroid hormones directly promote both physiological and pathological myocardial hypertrophy 1
  • Cardiac Remodeling: In hyperthyroidism, LVH is characterized primarily by eccentric remodeling due to volume overload 2

Hypothyroidism and LVH

  • Myocardial Fibrosis: Hypothyroidism promotes myocardial fibrosis by stimulating fibroblasts 1
  • Coronary Microcirculation: Chronic hypothyroidism leads to loss of coronary arterioles and impaired blood flow 1
  • Maladaptive Changes: Hypothyroidism causes maladaptive changes in myocyte shape 1

Clinical Evidence

Hyperthyroidism

  • Recent echocardiographic studies confirm that patients with hyperthyroidism caused by Graves' disease have significantly higher values of left ventricular diameter, volume, and mass compared to healthy controls 3
  • LVH in hyperthyroidism shows positive correlations with stroke volume, cardiac output, output-pressure index, systolic blood pressure, BMI, and serum triiodothyronine concentration 2
  • Hyperthyroidism significantly influences left ventricular contractility and leads to deterioration of systolic and diastolic function 3
  • The prevalence of LV diastolic dysfunction is significantly higher (35.1%) in hyperthyroid patients compared to euthyroid controls (25.5%) 4

Persistence of LVH

  • Importantly, studies show that increased LVM in hyperthyroid patients does not normalize despite attainment of euthyroidism with treatment 2, suggesting that structural cardiac changes may persist even after thyroid function is controlled

Risk Factors for LVH in Thyroid Dysfunction

  • Age: Older patients with hyperthyroidism have significantly higher risk of developing LV diastolic dysfunction 4
  • BMI: Overweight or obese hyperthyroid patients have a 3-fold increased risk of LV diastolic dysfunction 4
  • Duration of Disease: Longer exposure to elevated thyroid hormone levels increases risk of cardiac abnormalities 1

Clinical Implications and Management

Diagnostic Approach

  • Standard guideline-directed workup is recommended for assessment of pathogenesis and prognosis in patients with suspected thyroid-related cardiac changes 1
  • Echocardiography is essential to evaluate LV mass, wall thickness, and systolic/diastolic function in patients with thyroid dysfunction

Treatment Recommendations

  • Beta-blockers: Use of β-blockers is reasonable in patients with cardiac-related symptoms and signs of hyperthyroidism (Level of Evidence C) 1
  • Standard HF Therapy: Standard guideline-directed medical therapy for heart failure is recommended for patients with thyroid-related cardiomyopathy 1
  • Thyroid Function Normalization: Appropriate therapy of the primary disorder of excess or deficiency of thyroid hormones should be performed in all patients with coexisting cardiac dysfunction 1

Special Considerations

  • Beta-blockers can diminish cardiac hypertrophy in hyperthyroidism but may not completely reverse all cardiac functional changes 5
  • In patients with pulmonary hypertension secondary to hyperthyroidism, treating the thyroid dysfunction may improve right ventricular function 1

Monitoring

  • Serial echocardiograms are necessary to monitor the degree of hypertrophy and myocardial function in patients with thyroid-related LVH 6
  • Regular monitoring of thyroid function tests and cardiovascular parameters is essential in the management of thyroid dysfunction 7

In conclusion, thyroid dysfunction, particularly hyperthyroidism, is an important and potentially reversible cause of LVH that should be considered in the differential diagnosis of unexplained cardiac hypertrophy.

References

2
Research

Left ventricular mass in patients with hyperthyroidism.

Medical science monitor : international medical journal of experimental and clinical research, 2006

6
Guideline

statement on the care of the child with chronic lung disease of infancy and childhood.

American Journal of Respiratory and Critical Care Medicine, 2003

7
Guideline

Management of Narrowed Pulse Pressure

Praxis Medical Insights: Practical Summaries of Clinical Guidelines, 2025

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