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CCRN — Adult Critical Care
CCRN Cardiovascular Practice Questions (ACS, Heart Failure, Arrhythmias)
Cardiovascular content carries the largest weight on the adult CCRN blueprint, and the exam frames it as prioritization under pressure: a patient is decompensating, and you must pick the intervention that addresses the highest-acuity threat first. It rewards nurses who connect pathophysiology to the bedside action — recognizing the STEMI, the failing pump, the lethal rhythm — rather than reciting drug lists.
This guide reviews the high-yield cardiovascular patterns and drills CCRN-style questions with rationales. Educational review only: titrations, doses, and protocol specifics follow your institution's policies and current AHA/AACN guidance — verify before applying.
ACS, STEMI, and the failing pump
Acute coronary syndrome: the exam expects rapid 12-lead interpretation logic — ST elevation in contiguous leads localizes the territory (inferior: II, III, aVF; anterior: V1–V4; lateral: I, aVL, V5–V6) and drives door-to-balloon urgency. The right-ventricular-infarct caveat is heavily tested: inferior STEMI with hypotension may be RV-dependent on preload — these patients need volume and are exquisitely sensitive to nitrates/preload reducers (which can crash them). Recognize reciprocal changes, the time-critical nature of reperfusion, and post-PCI complications.
Heart failure: distinguish the congestion picture (volume overload — dyspnea, crackles, edema, JVD — managed with diuresis, afterload reduction, and oxygenation/positioning) from cardiogenic shock (hypoperfusion — the pump failing to deliver output). Acute pulmonary edema is an oxygenation and preload/afterload emergency: upright positioning, noninvasive ventilation where appropriate, nitrates and diuretics per protocol, and treating precipitants. Know the difference between systolic (reduced EF) and diastolic (preserved EF, stiff ventricle) failure because management emphasis differs.
Arrhythmias and post-arrest care
Rhythm priorities: the CCRN tests the stable-versus-unstable decision relentlessly — unstable tachyarrhythmia with a pulse (hypotension, altered mentation, ischemic chest pain, acute heart failure) gets synchronized cardioversion; pulseless VT/VF gets defibrillation and CPR; symptomatic bradycardia gets atropine then pacing, with the nuance that high-grade blocks respond poorly to atropine. Atrial fibrillation with rapid ventricular response splits into rate vs rhythm control and anticoagulation/stroke-risk reasoning; new-onset AF in the unstable patient may need cardioversion.
Post-arrest (ROSC) care is high-yield and under-studied: targeted temperature management per protocol, avoiding both hypoxia and hyperoxia (titrate oxygen to a normal saturation target), maintaining normocapnia (no reflexive hyperventilation), supporting MAP/perfusion (fluids/pressors to the guideline floor), obtaining a 12-lead and pursuing reperfusion for STEMI, glucose control, and seizure surveillance. The unifying theme across post-arrest care: protect the injured brain and heart from the secondary insults — hypoxia, hypotension, hyperventilation, hyperthermia — that the care team itself can inflict.
Practice questions with answers & rationales
Q1. A patient with an inferior STEMI becomes hypotensive after a dose of nitroglycerin. What was likely missed?
Answer: Right ventricular involvement — inferior STEMIs frequently involve the RV, which is preload-dependent. Nitroglycerin (a venodilator) drops preload, and an RV-dependent patient crashes. The tested actions: suspect RV infarct with inferior STEMI and hypotension (confirm with right-sided leads, e.g., V4R), give cautious fluids to support preload, and avoid/withhold nitrates and other preload reducers. This is one of the most reliable CCRN discriminators in ACS content.
Q2. Differentiate the management emphasis for acute decompensated heart failure with congestion versus cardiogenic shock.
Answer: Congestion (warm and wet) emphasizes decongestion: diuresis, afterload reduction, oxygenation, upright positioning, NIV when indicated. Cardiogenic shock (cold and wet/dry) emphasizes perfusion: inotropic support, cautious management of preload, treating the cause (reperfusion), and possibly mechanical support — diuresing a hypoperfused, low-output patient without addressing the pump can worsen shock. The exam wants you to classify the hemodynamic profile before choosing the lever.
Q3. Your patient in atrial fibrillation with RVR at 165 becomes hypotensive and confused with chest pain. Next intervention?
Answer: Synchronized cardioversion — the patient is unstable (hypotension, altered mentation, ischemic symptoms) and the rhythm is the cause. Rate-control medications are for stable RVR; an unstable patient gets electricity, synchronized to avoid the R-on-T risk of an unsynchronized shock on a perfusing rhythm. Anticoagulation/stroke-risk considerations matter for the broader plan but do not delay cardioversion in the unstable patient.
Q4. Why is hyperoxia avoided in post-cardiac-arrest care?
Answer: Sustained high oxygen tensions after ROSC are associated with oxidative injury and worse neurologic outcomes; current guidance titrates oxygen to a normal saturation target (e.g., 92–98%) rather than leaving maximal FiO2 running. Paired with avoiding hypoxia and maintaining normocapnia, the principle is the same: the reperfused brain is vulnerable, and both too little and too much oxygen harm it. Recognizing hyperoxia as an active harm is a high-yield, under-studied point.
Q5. A patient has symptomatic bradycardia at 38 with a third-degree AV block and hypotension; atropine doesn't help. Expected next step?
Answer: Transcutaneous pacing (with sedation/analgesia), or a chronotropic infusion per protocol, and preparation for transvenous pacing. The rationale the exam wants: atropine acts at the AV node by reducing vagal tone, but third-degree (and Mobitz II) blocks are typically infranodal — atropine usually fails — so guidelines move to pacing without delay. Confirm both electrical and mechanical capture (a pulse matching the paced rate) when pacing.
Q6. What 12-lead findings localize an anterior wall MI, and why does anterior involvement worry you more?
Answer: ST elevation in the precordial leads V1–V4 localizes anterior injury, usually from a proximal LAD lesion. Anterior MIs threaten a large mass of left-ventricular myocardium, raising the risk of pump failure, cardiogenic shock, and serious arrhythmias — so they carry a worse prognosis and demand the fastest reperfusion. Recognizing the territory and anticipating the complications (heart failure, blocks) is the prioritization skill tested.
Q7. Post-ROSC, your patient is comatose with a MAP of 60 and SpO2 of 100% on high-flow oxygen. Name two guideline-driven adjustments.
Answer: Support the MAP toward the guideline target (commonly MAP ≥65) with fluids/vasopressors, because post-arrest hypotension worsens neurologic injury and re-arrest risk; and titrate the oxygen down toward a normal saturation target to avoid hyperoxia. Add targeted temperature management per protocol, normocapnic ventilation, a 12-lead, and glucose control, and you've named the post-arrest bundle the CCRN expects.
Common mistakes to avoid
- Giving nitrates to an inferior/RV STEMI with hypotension — preload reduction crashes a preload-dependent ventricle.
- Failing to classify heart failure by hemodynamic profile before choosing diuresis versus inotropy.
- Using rate-control drugs in an unstable tachyarrhythmia instead of synchronized cardioversion.
- Leaving maximal oxygen running post-ROSC — hyperoxia is harmful, not merely neutral.
- Expecting atropine to fix high-grade AV blocks and delaying pacing.
- Neglecting the post-arrest bundle (MAP support, oxygen titration, normocapnia, temperature, 12-lead) — it's heavily tested and rarely reviewed.