3. How long can the heart muscle survive ischaemic conditions before it is irreversibly damaged? (At body temperature) Posted on April 8, 2023 Correct answer: Between 3 and 6 minutes. Post navigation Previous Post2. What happens to the body when the circulation is temporarily stopped at body temperature? Which tissues are the least tolerant to ischaemia? Next Post4. What is the effect of hypothermia on the tolerance of the body tissues to ischaemia?