Questions
2–3 descriptive questions in university exams
Difficulty
Medium
Importance
High yield for B.Sc Nursing and MBBS practical/viva
Overview
Emergency and crash-cart drugs constitute the pharmacological foundation of life support protocols in clinical settings. Understanding the mechanism, indication, and rapid administration of these agents is critical for managing acute cardiac, respiratory, and anaphylactic crises. Mastering this topic is essential for both theory exams and clinical viva voce assessments in nursing and medical curricula.
Adrenergic Agonists: Adrenaline and Noradrenaline
Adrenaline is the gold standard for cardiac arrest and anaphylaxis due to its potent alpha and beta-adrenergic receptor stimulation. It increases coronary perfusion pressure and heart rate, making it the first-line drug in ACLS protocols.
- Adrenaline: 1mg IV every 3-5 mins in cardiac arrest
- Acts on alpha-1, beta-1, and beta-2 receptors
- Indicated in anaphylaxis, symptomatic bradycardia, and asystole
- Noradrenaline: First-line vasopressor for septic shock
- Must be administered via a central line when possible
Antiarrhythmics and Cardiac Support
These agents are utilized to restore sinus rhythm or stabilize membrane potential during life-threatening arrhythmias. Amiodarone and Atropine are primary focus areas for board examinations regarding mechanism of action.
- Amiodarone: Class III antiarrhythmic for VF/pVT
- Atropine: Muscarinic antagonist for symptomatic bradycardia
- Atropine dose: 1mg IV, repeat every 3-5 mins (max 3mg)
- Adenosine: Used for paroxysmal supraventricular tachycardia (PSVT)
- Adenosine has an ultra-short half-life of <10 seconds
Crash Cart Management and Protocols
A crash cart is a standardized mobile unit containing essential emergency equipment and medications categorized by utility. Knowledge of the cart's organization is mandatory for hospital-based clinical assessments.
- Top drawer: Drugs for cardiac arrest (Adrenaline, Amiodarone)
- Second drawer: IV fluids and infusion pumps
- Third drawer: Respiratory equipment (ET tubes, laryngoscopes)
- Fourth drawer: IV cannulas, syringes, and venous access kits
- Defibrillator is always mounted on top of the cart
Formula Sheet
Adrenaline concentration: 1:1000 for IM (Anaphylaxis), 1:10000 for IV (Cardiac Arrest)
Adenosine IV Bolus: 6mg, followed by 12mg if needed
Amiodarone first dose: 300mg IV push
Exam Tip
Always link the drug administration to the specific ACLS algorithm step, as examiners look for clinical reasoning rather than just rote memorization of doses.
Common Mistakes
- Confusing the dosage of Atropine for bradycardia with the dosage for organophosphate poisoning.
- Ignoring the necessity of a saline flush after rapid IV bolus drugs like Adenosine.
- Failure to mention the absolute contraindication of specific drugs in patient groups, such as beta-blockers in heart block.
More Revision Notes
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