Final answer:
The standard first dose of IV atropine for bradycardia is 0.5 mg and can be repeated, but the cumulative dose should not exceed 3 mg. The endpoint of administration is symptom resolution.
Step-by-step explanation:
The recommended first dose of IV atropine for managing bradycardia is typically 0.5 mg, administered intravenously. If needed, this can be repeated every 3 to 5 minutes. The maximum total dose for atropine in this scenario should not exceed 3 mg. It's important to note that the end goal of atropine administration is not a specific heart rate but the resolution of symptoms associated with bradycardia, including the clearing of bronchial secretions. However, it is essential to follow the protocols of the specific medical establishment and the directives of the attending physician.