No the man penis does not shrink after a heart attack.

The signs ans symptoms of a heart attack are:
1. mid-sternal chest pressure or pain, chest pain that doesn't respond as well to nitroglycerin.

2. pain radiating down left arm
3. shortness of breath
4. may have pain between shoulder blade
5. nausea and Vomiting
6. may have pain in jaw
7. weakness
your blood pressure will very depending on the person

It all depends how quick you get EMS involved, and the general health of the patient. I have worked ambulance call were the patient was in great health and died even tho we did ever thing we could.