How would a blockage in one of the coronary arteries affect the hearts stroke volume?

By decreasing oxygen. The heart muscle depends on oxygen supplied by the coronary arteries to effectively function. When the artery is narrowed it can decrease the supply of oxygen and decrease the force of the muscle contraction. The stroke volume is a measure of how much blood the heart forces out with each beat.
Stroke volume. If a major artery is blocked then it will result in damage to that part of the heart muscle and the muscle will not be able to pump blood out of the heart hence the stroke volume will reduce.

Related Questions

Can heart blockage or coronary artery disease occur at age 25?

Yes but uncommon. Although uncommon, it is usually due to a congenital cause (conditions that one is born with). Classic atherosclerotic plaque is unlikely unless the patient has a severe form of family hyperlipidemia, type 1 diabetes, heavy smoker, Cocaine user, etc. Abnormal position of the coronary arteries is a rare but potential lethal cause of a heart attack. Read more...

How do I reduce the risk of a heart attack via coronary artery blockage?

Proactive care. Big topic. Briefly: maintain healthy weight, exercise regularly, eat healthy diet, don't use tobacco, limit alcohol consumption, manage stress, have regular physicals with a physician focused on proactive care. Eval generally looks for high blood pressure, diabetes/pre-diabetes/insulin resistance, cholesterol panel. More advanced "cholesterol" testing is available and better at predicting risk. Read more...
Healthy lifestyle. Control body weight, high blood pressure, diabetes, don't smoke, live healthy and if you have known coronary artery blockage, talk to your cardiologist about whether that can be opened up by a procedure or you need to take blood thinners. An Aspirin a day is a must! Read more...

Had a heart angiogram show blockage in my left main coronary artery. Ok.Why?

Emergency. Blockage in the left main coronary artery is considered an emergency condition requiring urgent intervention by angioplasty or bypass surgery. This situation is associated with high mortality if left alone. Read more...

What do you recommend if I had a heart angiogram with 70% blockage in my left main coronary artery. No stint. Dr afraid he would block. Why?

Bypass surgery. everything is a balance between risk/benefit. often with a > 50% left main blockage, a bypass surgery is the safest choice. medical therapy alone carries a high risk of sudden death due to the severity of the blockage. a stent placement there, though relatively simple - might have a catastrophic outcome if any slight thing went wrong. a stent is indicated if surgery is higher than usual risk. Read more...

Why are people with peripheral artery disease (legs) at greater risk of heart attack and stroke than someone with coronary artery disease (heart)?

Generalization. Peripheral vascular disease is often a marker for someone who has vascular disease throughout their body, usually due to smoking, genetics, and diet issues, to name a few causes. As such they are at high risk for symptoms in the other critical vascular beds in the body like the heart and brain. Read more...