How can a patient have a heart attack during a colonoscopy?

There is nothing about a colonoscopy that prevents a heart attack from happening; you can have one at any time. For some the procedure may elevate stress a bit. I have to say, without wanting to sound morbid, that if I should ever have a heart attack, I hope it is while I am having a colonoscopy or other hospital procedure. I would already be prepped for emergency treatment, and I would already be in the right place.