The Claim
Nitric oxide is the primary mediator of epicardial coronary artery dilation during metabolic stress in patients without cardiovascular risk factors, and its inhibition results in vasoconstriction instead of dilation.
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.
In people without cardiovascular risk factors, nitric oxide causes the main blood vessels around the heart to widen during metabolic stress; blocking nitric oxide makes these vessels narrow instead.
See the scientific wording
Nitric oxide is almost entirely responsible for epicardial coronary artery dilation during metabolic stress in patients without cardiovascular risk factors, as its inhibition converts dilation into constriction.
When the heart works harder, blood flows faster through the main heart arteries, which triggers the inner lining of the arteries to produce nitric oxide. This gas travels to the muscle layer around the arteries and tells it to relax, causing the arteries to widen and let more blood through. If nitric oxide is blocked, the arteries tighten instead of widening, reducing blood flow when the heart needs it most.
What the research says
1 studyStudy: Contribution of nitric oxide to metabolic coronary vasodilation in the human heart.
In healthy people, when the heart needs more oxygen during exercise, a chemical called nitric oxide makes the main heart arteries widen. When scientists blocked nitric oxide, those arteries shrank instead — proving it’s the main reason they widen under stress.
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.