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Diffuse Myocardial Injuries are Present in Subclinical Hypothyroidism: A Clinical Study Using Myocardial T1-mapping

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  • 1Department of Endocrinology, Beijing Chaoyang Hospital, Capital Medical University, Beijing, 100020, China.

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Summary
This summary is machine-generated.

Subclinical hypothyroidism (SHT) shows early myocardial injuries detectable by cardiac magnetic resonance T1 mapping. This technique can identify diffuse cardiac damage in SHT patients, aiding early diagnosis and intervention.

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Area of Science:

  • Cardiology
  • Endocrinology
  • Medical Imaging

Background:

  • Subclinical hypothyroidism (SHT) is linked to cardiovascular risks, but detecting associated myocardial injuries is challenging.
  • Previous research established cardiac magnetic resonance (CMR) T1 mapping for overt hypothyroidism, suggesting potential for SHT.
  • Early identification of cardiac changes in SHT is crucial for preventing adverse cardiovascular events.

Purpose of the Study:

  • To investigate the presence of diffuse myocardial injuries in subclinical hypothyroidism (SHT) patients.
  • To evaluate the utility of cardiac magnetic resonance (CMR) T1 mapping for detecting these injuries.
  • To correlate T1 mapping findings with thyroid hormone levels and cardiac function.

Main Methods:

  • Utilized cardiac magnetic resonance (CMR) T1 mapping to assess myocardial tissue characteristics.
  • Compared native T1 values in the left ventricles of SHT participants and healthy controls.
  • Analyzed correlations between T1 values, thyroid-stimulating hormone (TSH), free thyroxine (FT4), and left ventricular diastolic function (peak filling rate - PFR).

Main Results:

  • SHT participants exhibited significantly increased native T1 values in the left ventricle compared to controls (p < 0.01).
  • Elevated T1 values were more pronounced in SHT patients with TSH levels ≥10 µIU/mL.
  • Native T1 values showed a negative correlation with FT4 (r=-0.476, p=0.003) and a positive correlation with TSH (r=0.489, p=0.002).
  • Left ventricular diastolic function, measured by PFR, was significantly reduced in SHT patients with TSH ≥10 µIU/mL (p < 0.05).

Conclusions:

  • Diffuse myocardial injuries are present in subclinical hypothyroidism (SHT).
  • Cardiac magnetic resonance (CMR) T1 mapping is a valuable tool for detecting early, mild myocardial injuries in SHT.
  • This study provides the first evidence of myocardial injuries in SHT using T1 mapping, highlighting its diagnostic potential.