From coronary occlusion to muscle injury
A myocardial infarction usually begins when a plaque in a coronary artery ruptures and a clot abruptly blocks blood flow. The muscle downstream becomes ischemic within seconds to minutes, losing its oxygen supply. If flow is not restored, ischemia progresses to irreversible cell death (infarction), generally beginning within roughly 20 to 40 minutes and expanding over the following hours.
This time dependence is why the phrase time is muscle is used in emergency care: the faster blood flow is restored, the more heart muscle can be salvaged. Suspected heart attack is a medical emergency and warrants immediate emergency services.
Healing and remodeling over days to weeks
After the acute event, the infarcted area moves through inflammation, removal of dead tissue, and replacement with scar over days to weeks. The healthy heart also adapts its shape and pumping in a process called remodeling, which can be helpful or harmful depending on the size and location of the injury.
This is general educational information about a typical biological sequence, not medical advice. Individual presentations vary, and diagnosis, treatment, and recovery should always be managed by qualified medical professionals.