Cardiovascular Emergencies, Shock & Resuscitation
Prioritize stabilization in unstable cardiovascular presentations and recognize when immediate defibrillation, cardioversion, pacing, reperfusion or invasive treatment is required.
Module format: each study session covers what to learn, how the presentation appears clinically, investigation/management priorities, safety issues and common MCCQE traps.
Module 12 — Topic map
- Cardiac arrest: initial response, high-quality CPR and shockable/non-shockable rhythm concepts
- Ventricular fibrillation and pulseless VT
- PEA/asystole and reversible causes
- Unstable tachycardia and synchronized cardioversion
- Symptomatic bradycardia and pacing/escalation principles
- Cardiogenic shock after MI and other causes
- Obstructive cardiovascular shock: tamponade and massive pulmonary embolic physiology
- Acute pulmonary edema with respiratory compromise
- Aortic catastrophe and rapidly progressive mechanical complications of MI
- Post-resuscitation priorities and identifying the precipitating cardiac cause
Acute CareManagementPatient safetyTime-critical decisions
Study Session 12.1 — Cardiac Arrest & ACLS Principles
Focused MCCQE cardiovascular study session
Core topics & learning goals
- Recognize VF/pulseless VT versus PEA/asystole.
- Prioritize high-quality CPR and early defibrillation for shockable rhythms.
- Know reversible causes (Hs and Ts) conceptually.
- Understand epinephrine/antiarrhythmic roles at a high-yield level.
Clinical recognition & investigation
- Minimize interruptions in compressions and reassess rhythm appropriately.
- Look for acute coronary, electrolyte, hypoxic, toxic and obstructive causes.
Management & patient-safety priorities
- Defibrillate shockable rhythms promptly and continue structured resuscitation.
- Initiate post-ROSC stabilization and cause-directed care.
MCCQE exam traps
- Synchronized cardioversion is not used for pulseless VF/VT.
- Do not delay defibrillation for intubation in a shockable arrest.
Study Session 12.2 — Unstable Tachycardia / Bradycardia & Electrical Therapy
Focused MCCQE cardiovascular study session
Core topics & learning goals
- Define instability by hypotension, altered mental status, ischemic chest discomfort, shock or acute HF.
- Choose synchronized cardioversion for unstable tachycardia with a pulse.
- Recognize symptomatic bradycardia requiring atropine/pacing escalation.
- Distinguish cardioversion, defibrillation and pacing.
Clinical recognition & investigation
- Treat the patient rather than the monitor; correlate rhythm with symptoms.
- Consider sedation when feasible without delaying lifesaving therapy.
Management & patient-safety priorities
- Escalate rapidly to transcutaneous/transvenous pacing when appropriate.
- Correct ischemia, electrolytes and medication toxicity.
MCCQE exam traps
- Do not delay electrical therapy in an unstable patient for a perfect rhythm diagnosis.
- Adenosine is not a substitute for cardioversion in unstable tachycardia.
Study Session 12.3 — Cardiogenic / Obstructive Shock & Mechanical Emergencies
Focused MCCQE cardiovascular study session
Core topics & learning goals
- Recognize shock physiology: hypotension, altered mentation, cool skin, oliguria and lactate elevation.
- Differentiate cardiogenic shock from tamponade and massive PE physiology.
- Recognize post-MI VSD, papillary rupture and free-wall rupture.
- Use bedside echo/hemodynamics to guide the differential.
Clinical recognition & investigation
- Identify pulmonary edema versus clear lungs, JVP pattern and new murmurs.
- Avoid reflex fluid loading in cardiogenic pulmonary edema.
Management & patient-safety priorities
- Stabilize ABCs and activate urgent reperfusion/interventional/surgical pathways.
- Use vasoactive/mechanical support only in appropriate specialist-managed settings.
MCCQE exam traps
- Shock after MI is not always pump failure; look for mechanical complications.
- Tamponade is treated by relieving obstruction, not simply escalating vasopressors.