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Related Experiment Video

Updated: Jul 13, 2026

In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography

In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography

Published on: February 16, 2016

Endogenous subclinical hyperthyroidism: Metabolic and cardiac parameters.

T Psaltopoulou¹, I Ilias, S Toumanidis

¹Department of Medical Therapeutics, Alexandra Hospital, Athens University School of Medicine, Greece.

European Journal of Internal Medicine

|August 19, 2007

Summary

Endogenous subclinical hyperthyroidism (SH) does not significantly affect metabolic or cardiac parameters. Only endogenous clinical hyperthyroidism (ECH) showed notable differences in these measures compared to healthy individuals.

Related Experiment Videos

Last Updated: Jul 13, 2026

In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography

In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography

Published on: February 16, 2016

Area of Science:

Endocrinology
Cardiology
Metabolic Disorders

Background:

Subclinical hyperthyroidism (SH) is characterized by suppressed TSH with normal thyroid hormones.
Endogenous SH (ESH) is less common than exogenous SH, and its cardiovascular and metabolic effects are debated.
Previous studies on exogenous SH show adverse effects, but ESH impact remains controversial.

Purpose of the Study:

To investigate the cardiovascular and metabolic effects of endogenous subclinical hyperthyroidism (ESH).
To compare ESH and endogenous clinical hyperthyroidism (ECH) with healthy controls.
To clarify the impact of ESH on cardiac and metabolic parameters.

Main Methods:

Cross-sectional study design.
Inclusion of patients with ECH (n=20), ESH (n=25), mild ESH (n=32), and healthy controls (n=50).
Assessment of biochemical, metabolic, and cardiac parameters via echocardiography and 24-hour ECG-blood pressure monitoring.

Main Results:

No significant differences in biochemical, metabolic, or echocardiographic parameters between ESH patients and healthy controls.
ECH group showed elevated sex hormone-binding globulin, osteocalcin, and carboxy-terminal telopeptide.
ECH group exhibited increased heart rate, cardiac output, cardiac index, left ventricular dimensions, and tachycardia episodes compared to controls.

Conclusions:

Endogenous subclinical hyperthyroidism (ESH) does not appear to significantly alter metabolic or cardiac function.
Significant metabolic and cardiovascular changes were observed only in patients with endogenous clinical hyperthyroidism (ECH).
These findings suggest ESH may not pose the same risks as previously thought, unlike ECH.