In which phase of resuscitation does the body begin to rely on anaerobic metabolism due to decreased oxygen levels?

The metabolic phase of resuscitation is characterized by the body transitioning to anaerobic metabolism as oxygen availability diminishes. During cardiac arrest or severe hypoperfusion, oxygen transport to tissues is compromised, leading cells to shift from aerobic metabolism, which requires oxygen, to anaerobic metabolism, which does not. This shift results in the production of lactic acid and other metabolites, indicating that the body is struggling to maintain energy production under low oxygen conditions.

This phase typically occurs approximately 10 minutes after the onset of cardiac arrest. Without timely interventions, the accumulation of waste products and lack of adequate oxygen supply can lead to cellular injury and compromise the chances of successful resuscitation. Understanding this phase is crucial for emergency responders to effectively prioritize interventions that can restore oxygenation and circulation.