The Claim
In hyperthyroid patients without prior ischemic heart disease, myocardial ischemia detected by 99mTc-Sestamibi scintigraphy is more common and more severe in women than in men.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
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.
See the scientific wording
In hyperthyroid patients without prior ischemic heart disease, myocardial ischemia detected by 99mTc-Sestamibi scintigraphy is more common and severe in women, given that 93.3% of the study cohort were female and all ischemic findings occurred in this group.
When the thyroid is overactive, the heart beats faster and harder, using more oxygen. In women, estrogen makes the blood vessels in the heart tighten more easily under stress, reducing blood flow just when the heart needs more. This mismatch causes heart tissue to become starved of oxygen, which shows up as damage on imaging scans.
What the research says
1 studyIn this small group of hyperthyroid patients, every single person with heart stress signs was a woman — and most of the group were women. So, it looks like women might be more likely to show this kind of heart issue when their thyroid is overactive.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.