Maximum dose of atropine can be given is?

Appeared in: AIIMS Rishikesh & Jodhpur NO - 2017

Explanation

3 mg, which is the maximum cumulative dose of atropine recommended by Advanced Cardiovascular Life Support (ACLS) guidelines for treating symptomatic bradycardia in adults.
Atropine is administered as 0.5 mg IV every 3-5 minutes.
A total of 6 doses (6 x 0.5 mg) equals the maximum of 3 mg.
Doses beyond 3 mg are not effective for bradycardia and can lead to anticholinergic toxicity without providing further benefit to heart rate.

Option A: 1 mg is a potential cumulative dose after two 0.5 mg administrations, but it is not the maximum total dose allowed.
Option C: 5 mg exceeds the recommended maximum dose for bradycardia. This dose level increases the risk of anticholinergic toxicity without additional therapeutic benefit.
Option D: 10 mg is a significantly excessive dose for treating bradycardia and would likely cause severe anticholinergic poisoning (tachycardia, delirium, flushed skin).

Clinical Relevance

Nursing practice connection: Knowing Pharmacology: Atropine Dosage helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses must know the maximum dose of emergency medications like atropine to prevent medication errors and toxicity. Administering more than 3 mg for bradycardia is a deviation from standard ACLS protocol.
During administration, the nurse's priority is to continuously monitor the patient's heart rate, rhythm on the ECG, blood pressure, and mental status for improvement or signs of toxicity.
What if? If a patient with bradycardia does not respond to the maximum 3 mg dose of atropine, the next step in the ACLS algorithm is not more atropine. Instead, the team would prepare for transcutaneous pacing or consider an infusion of dopamine or epinephrine.

How to Approach the Question

First, identify the keyword in the question: "Maximum dose" and "atropine".
Recognize that without a specific condition mentioned (like poisoning), the question is most likely referring to the standard use of atropine in cardiac emergencies, specifically for symptomatic bradycardia as per ACLS guidelines.
Recall the ACLS protocol for atropine: the single dose, the frequency of administration, and the total cumulative maximum dose.
The standard single dose is 0.5 mg, repeated every 3-5 minutes.
Calculate or recall the maximum dose, which is 3 mg.
Compare this knowledge with the given options to select the correct one.

Concept Tested & Keywords

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KD Tripathi - Essentials of Medical Pharmacology (6th Edition) p. 27-28

Practise the full AIIMS Rishikesh & Jodhpur NO - 2017

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