CEP Cardiac Care & Emergency Pharmacology — Questions and Answers

Question 1: What is the first-line treatment for a patient experiencing ventricular fibrillation?

Administering atropine.
Performing synchronized cardioversion.
Delivering unsynchronized defibrillation shock (Correct answer)
Initiating a beta-blocker infusion.

Correct answer: Delivering unsynchronized defibrillation shock

The first-line treatment for a patient experiencing ventricular fibrillation (VF) is immediate unsynchronized defibrillation. VF is a chaotic electrical activity in the ventricles that results in no effective cardiac output, leading to cardiac arrest. Delivering an electrical shock is the definitive intervention to terminate VF and reset the heart's electrical activity, aiming to restore a perfusing rhythm and improve survival chances.

Question 2: Which medication is commonly used to treat bradycardia in the prehospital setting?

Adenosine
Amiodarone
Atropine (Correct answer)
Lidocaine

Correct answer: Atropine

Atropine is the medication commonly used to treat symptomatic bradycardia (slow heart rate) in the prehospital setting. It acts as an anticholinergic agent, blocking the effects of the vagus nerve, which normally slows the heart. By doing so, atropine increases the heart rate and improves cardiac output, helping to alleviate symptoms such as hypotension or altered mental status caused by the slow heart rate.

Question 3: What is the primary action of epinephrine during cardiac arrest?

Decreases afterload
Increases vasodilation
Promotes diuresis
Increases perfusion pressure (Correct answer)

Correct answer: Increases perfusion pressure

The primary action of epinephrine during cardiac arrest is to increase perfusion pressure, particularly coronary and cerebral perfusion. As a potent vasoconstrictor and cardiac stimulant, epinephrine increases systemic vascular resistance, which elevates aortic diastolic pressure. This improved blood flow to the heart and brain is crucial for increasing the chances of successful resuscitation and achieving a return of spontaneous circulation (ROSC).

Question 4: Which rhythm is most appropriate for synchronized cardioversion?

Asystole
Ventricular fibrillation
Unstable SVT (Correct answer)
Pulseless ventricular tachycardia

Correct answer: Unstable SVT

Unstable supraventricular tachycardia (SVT) is the rhythm most appropriate for synchronized cardioversion. Synchronized cardioversion delivers an electrical shock that is precisely timed with the R-wave of the patient's QRS complex. This synchronization is crucial to avoid delivering a shock during the vulnerable T-wave, which could induce ventricular fibrillation, and is used to convert unstable tachyarrhythmias with a pulse back to a normal rhythm.

Question 5: What is the goal of administering nitroglycerin during chest pain?

To constrict coronary vessels
To decrease preload and myocardial oxygen demand (Correct answer)
To increase afterload
To raise blood pressure rapidly

Correct answer: To decrease preload and myocardial oxygen demand

The goal of administering nitroglycerin during chest pain is to decrease preload and myocardial oxygen demand. Nitroglycerin is a vasodilator that primarily acts on venous capacitance vessels, causing venodilation. This reduces the amount of blood returning to the heart (preload), which in turn decreases the heart's workload and its demand for oxygen. By reducing myocardial oxygen demand, nitroglycerin helps alleviate chest pain caused by myocardial ischemia (angina).

Question 6: How often should epinephrine be administered during CPR for adults?

Every 10 minutes
Every 1-2 minutes
Every 3-5 minutes (Correct answer)
Only once

Correct answer: Every 3-5 minutes

During adult CPR, epinephrine should be administered intravenously or intraosseously every 3-5 minutes. This dosing interval is based on established guidelines, such as those from the American Heart Association (AHA), and is crucial for maintaining adequate coronary and cerebral perfusion pressures throughout resuscitation efforts. Consistent administration within this timeframe helps maximize the drug's therapeutic effects and improve outcomes.

Question 7: Which of the following is a contraindication to nitroglycerin administration?

History of hypertension
Recent use of erectile dysfunction medication (Correct answer)
Sinus tachycardia
Bradycardia

Correct answer: Recent use of erectile dysfunction medication

Recent use of erectile dysfunction medications (PDE5 inhibitors like sildenafil or tadalafil) is a critical contraindication to nitroglycerin administration. Both medications are potent vasodilators, and their combined effect can lead to a severe, life-threatening drop in blood pressure (hypotension). This synergistic effect can cause profound shock and organ hypoperfusion.

Question 8: Which of the following rhythms is considered shockable in cardiac arrest?

Pulseless ventricular tachycardia (Correct answer)
Asystole
PEA
Normal sinus rhythm

Correct answer: Pulseless ventricular tachycardia

Pulseless ventricular tachycardia (pVT) is a shockable rhythm because it represents disorganized but still present electrical activity in the heart that can be reset by an electrical shock. Defibrillation aims to stop this chaotic electrical activity, allowing the heart's natural pacemaker to resume a normal rhythm. Asystole (no electrical activity) and PEA (organized electrical activity without a pulse) do not respond to defibrillation.

Question 9: Which pharmacologic agent is used to terminate supraventricular tachycardia (SVT)?

Epinephrine
Adenosine (Correct answer)
Atropine
Magnesium sulfate

Correct answer: Adenosine

Adenosine is the drug of choice for terminating stable narrow-complex supraventricular tachycardia (SVT). It works by transiently blocking the atrioventricular (AV) node, interrupting the re-entrant electrical pathway that causes SVT. This allows the heart's natural pacemaker to regain control and restore a normal sinus rhythm.

CEP Cardiac Care & Emergency Pharmacology

What is the first-line treatment for a patient experiencing ventricular fibrillation?