Which of the following medicines is used in asystole?

SGPGI Nursing Officer-2024

Pharmacology

Easy

Appeared in: SGPGI Nursing Officer-2024

Explanation

Epinephrine is the primary drug used in asystole as per the ACLS (Advanced Cardiovascular Life Support) algorithm.
Its main benefit is derived from its alpha-adrenergic (vasoconstrictor) effects, which increase systemic vascular resistance.
This vasoconstriction elevates aortic diastolic pressure, thereby improving blood flow and oxygen delivery to the heart (coronary perfusion pressure) and brain (cerebral perfusion pressure) during CPR.
The standard ACLS dose is 1 mg administered intravenously or intraosseously every 3-5 minutes during cardiac arrest.

Option B: Atropine was removed from the ACLS algorithm for asystole and PEA because studies showed it provided no therapeutic benefit and did not improve survival rates.
Option C: Dopamine is an inotrope and vasopressor used to increase blood pressure and cardiac output in patients who have a pulse but are hypotensive. It is not used in pulseless rhythms like asystole.
Option D: Steroids are not part of the standard ACLS protocol for the immediate management of asystole. They have no role in restoring cardiac activity in this setting.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pharmacological management of asystole according to Advanced Cardiovascular Life Support (ACLS) guidelines as background academic context rather than a clinical decision trigger.
Recognizing asystole as a non-shockable rhythm is a critical nursing skill. The nurse's immediate actions should be to initiate or continue high-quality CPR and prepare for medication administration, not defibrillation.
The nurse plays a key role in the resuscitation team by ensuring timely administration of epinephrine, keeping track of dosage times, and anticipating the need for subsequent doses every 3-5 minutes.
What if the rhythm was Ventricular Fibrillation (VF)? The priority would change completely. For VF, a shockable rhythm, the immediate priority is defibrillation, followed by CPR and consideration of antiarrhythmic drugs like amiodarone or lidocaine.

How to Approach the Question

First, identify the clinical condition presented in the question: 'asystole'. Recognize this as a state of cardiac arrest with no electrical activity.
Recall that cardiac arrest rhythms are divided into 'shockable' (VF/pVT) and 'non-shockable' (Asystole/PEA) categories.
Access your knowledge of the ACLS algorithm for non-shockable rhythms.
The core components of the asystole/PEA pathway are continuous high-quality CPR and administration of epinephrine. Evaluate the given options against this algorithm.
Eliminate options that are used for other conditions: Atropine (for bradycardia), Dopamine (for hypotension with a pulse), and Steroids (not a primary ACLS drug for asystole).

Concept Tested & Keywords

Concept Tested: Pharmacological management of asystole according to Advanced Cardiovascular Life Support (ACLS) guidelines.
Stem keywords: medicines, asystole
Lead-in keywords: Which

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E6 Medicine Harrison 22e Part 2 p. 240-242

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