Cardiac cells can withstand ischemic conditions and still return to a viable state for ______ minutes.

Cardiac cells have a limited capacity to withstand ischemia before they undergo irreversible changes. Typically, they can endure ischemic conditions with the potential for recovery if the blood supply is restored within approximately 20 minutes. During this time, the cells can adapt to the lack of oxygen and nutrients, allowing them to still potentially regain their function if reperfusion occurs before cellular damage becomes too severe. This understanding is critical in emergency settings, as timely intervention can make the difference between preserving heart muscle function or leading to significant damage and complications such as myocardial infarction. The emphasis on the 20-minute timeframe highlights the importance of quick medical response when a patient presents with signs of acute coronary syndrome.