What is a reversible cause of cardiac arrest?

Hypoxia is indeed a reversible cause of cardiac arrest because it refers to a deficiency in the amount of oxygen reaching the tissues. During a cardiac arrest, the heart is unable to effectively pump blood, leading to insufficient oxygen delivery to vital organs. If the underlying issue of hypoxia is identified and addressed promptly—such as by administering oxygen, ensuring adequate ventilation, or treating the cause of respiratory distress—the patient’s condition can improve and restore normal cardiac function.

The other options may contribute to cardiac arrest but are not typically classified as fully reversible causes in the same context as hypoxia. For instance, dehydration can lead to a variety of complications, but rehydration alone may not resolve all underlying issues immediately. Arrhythmias can also be managed effectively, but they often require specific interventions or medications. Acute coronary syndrome represents a more complicated state, and while it can be treated, it often involves multiple contributing factors that must be addressed holistically rather than being immediately reversible like hypoxia.