Final answer:
The key critical concept in treating bradycardia is establishing the underlying cause of the disorder.
Step-by-step explanation:
The key critical concept to consider in treating bradycardia is establishing the underlying cause of the disorder. Bradycardia can be caused by inherent factors such as abnormalities in the SA or AV node, or by external factors such as metabolic disorders or neurological disorders. Treatment relies on determining the specific cause and may involve a pacemaker, supplemental oxygen, or addressing the underlying condition.