The Study
Hyperthyroidism-Induced Myocardial Ischemia: Quantification and Correlation with fT4 via 99mTc-Sestamibi Scintigraphy
This study looked at 15 people with overactive thyroids and found that most of them also had signs of reduced blood flow to the heart. But it didn't prove that the thyroid problem caused the heart issue — they just happened together in these people.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
When your thyroid makes too much hormone, your heart works extra hard and can show signs of stress—even if your arteries are clean.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 526 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes—this suggests even young, otherwise healthy hyperthyroid patients may have hidden heart strain that could be caught early with a simple scan.
- 214 out of 15 patients had heart stress signs on a special scan; 12 of those had reversible stress, meaning the heart wasn't damaged—just overworked.
- 3Higher thyroid hormone levels meant worse stress signs.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Bioscientia Medicina : Journal of Biomedicine and Translational Research
Year
2025
Authors
Daniel Chung¹, A. Hussein, Sundawa Kartamihardja¹, Raden Erwin Affandi, Soeriadi Koesoemah¹, Daniel Chung
Related Content
Claims (6)
Hyperthyroidism causes a higher resting metabolic rate, which results in a faster heart rate, shaking, weight loss without trying, greater hunger, and diarrhea.
In people with hyperthyroidism, higher levels of free thyroxine in the blood are associated with more extensive and severe reductions in blood flow to the heart muscle, as detected by cardiac imaging.
In patients with hyperthyroidism, temporary reductions in heart blood flow detected by 99mTc-Sestamibi scintigraphy resolve without permanent blockage, indicating the cause is not fixed arterial narrowing.
Among hyperthyroid patients without prior heart disease, women are more likely than men to show signs of reduced blood flow to the heart muscle when tested with 99mTc-Sestamibi scintigraphy.
A nuclear imaging test using 99mTc-Sestamibi identifies abnormal heart function in people with hyperthyroidism who do not have known coronary artery disease.
In adults with hyperthyroidism but no prior heart disease, more than 90% show signs of reduced blood flow to the heart muscle on a specialized scan, and most of these cases involve temporary blood flow issues that are not caused by blocked arteries.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.