Effects of thyroxin therapy on cardiac function in patients with subclinical hypothyroidism: index of myocardial performance in the evaluation of left ventricular function
Abstract
Objective We investigated the effects of thyroxine (T4) therapy on the cardiac function in subclinical hypothyroidism (SHT) by using the index of myocardial performance (IMP) and the conventional echocardiographic parameters.Methods Forty-five SHT patients (F/M:38/7, age 39.9+/-7.9) and 29 healthy subjects (F/M:25/4, age 38.3+/-8.6) were studied. Patients were randomly assigned, in a double-blind manner to receive T4 therapy (group I) or a placebo (group II) and for a period of up to 12 months, were followed up using thyroid function tests and both conventional and Doppler echocardiographic measurements.Results At the baseline, the SHT patients has a significantly higher isovolumic relaxation time (IRT) (98.3+/-23.7 vs. 81.7+/-14.7<0.01), IMP (0.52+/-0.06 vs. 0.42+/-0.05; P<0.001), A max (late mitral peak velocity) (83.4+/-12.6 vs. 74.3+/-13.5; P<0.01) and significantly lower (early mitral peak velocity) Emax/Amax ratio (1.19+/-0.18 vs. 1.34+/-0.17; P<0.01) than the individuals in the control group. In group I, the thyroid hormone profile became normalized after 1 year of L-T4 therapy, but there was no significant change in the left ventricular (LV) morphology or systolic function. After 1 year of follow-up, group I showed a significant reduction of MPI (0.53+/-0.05 vs. 0.42+/-0.07; P<0.001), Amax (84.2+/-13.7 vs. 74.5+/-11; P<0.001) and IRT (98.6+/-23.7 vs. 82.9+/- 23.3; P<0.001) along with a normalization of the E/A ratio (1.17+/-0.16 vs. 1.33+/-0.19; P<0.001). Conversely, no change was observed in group II.Conclusions An impairment of left ventricular diastolic function, which may be reversible with T4 therapy, was observed in the SHT patients, and IMP may be useful in the evaluation of LV myocardial dysfunction in these patients.
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RCTs have demonstrated that LT4 replacement therapy affects myocardial function, particularly diastolic function, and over time the brachial artery intimal thickness.
“Similarly, RCTs have demonstrated that LT4 replacement therapy affects myocardial function (87) and particularly diastolic function (88-92), and, over time, the brachial artery intimal thickness (89,93).”
From Guidelines for the Treatment of Hypothyroidism: Prepared by the American Thyroid Association Task Force on Thyroid Hormone Replacement (2014) · cites this paper as [92]
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- Authors
- Yazici, M., Gorgulu, S., Sertbas, Y., Erbilen, E., Albayrak, S., Yildiz, O., & Uyan, C.
- Affiliations
- Düzce Üniversitesi (TR)
- Venue
- International Journal of Cardiology
- Publisher
- Elsevier BV
- Published
- 2004-06
- Volume
- 95
- Issue
- 2-3
- Pages
- 135-143
- ISSN
- 0167-5273 (ISSN-L)
- OpenAlex
- W2055238335
- Cited by
- 99
- References
- 54
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 3 · 2023: 7 · 2022: 2 · 2021: 2 · 2020: 9 · 2019: 4 · 2018: 6 · 2017: 1 · 2016: 2 · 2015: 5 · 2014: 6 · 2013: 12 · 2012: 5
- FWCI
- 3.18
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- International Journal of Cardiology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiovascular Function and Risk Factors
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Hormonal and reproductive studies
- Keywords
- subclinical hypothyroidism, levothyroxine therapy, left ventricular function, isovolumic relaxation time, E/A ratio, left ventricular systolic function, left ventricular diastolic function, Doppler echocardiography, thyroid hormone replacement, left ventricular structure, thyroid function
- MeSH terms
- Adult, Analysis of Variance, Double-Blind Method, Female, Heart, Humans, Hypothyroidism, Male, Thyroxine, Echocardiography, Doppler, Ventricular Function, Left
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