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They can be a few reasons, but more as a general response is probably because the post MI patient is on a plethora of hypotensives, and straining their stool would cause a vagal response, thus instantly decreasing their blood pressure which can cause most people to faint, which equals injury.
Vagus nerve activation widens blood vessels, reducing the return of blood to the heart, and slows the heart rate. Straining during bowel movements or urination or coughing increases chest pressure. Increased chest pressure can activate the vagus nerve and also reduce the return of blood to the heart.
How would this affect a new MI?
tiffc8433
5 Posts
Why would a heart attack patient be put on Colace?