Prepare for the Critical Care Registered Nurse exam with 720+ blueprint-aligned questions across all six AACN domains — weighted to the official AACN test plan, with a dashboard that shows exactly where to focus and a full exam simulation when you're ready.
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The CCRN certifies registered nurses who provide direct care to acutely and critically ill adult patients in ICU, CCU, trauma, and critical-care transport settings — spanning the major body systems and multisystem problems.
Your practice mix mirrors the official AACN CCRN test plan, so you study in the same proportions the exam tests.
CCRN tests interpretation, not recall. CertifyRN questions put the actual exhibit in front of you — a rhythm strip, a hemodynamic waveform, an ABG panel — and ask what you'd do next, the way the real exam does.
Identify the lethal rhythm and pick the intervention — defibrillate, pace, or push the drug.
Read arterial and PA-catheter tracings — wedge, CVP, CO/CI — and titrate accordingly.
| pH | 7.28 |
| PaCO₂ | 58 |
| HCO₃ | 26 |
Interpret the acid–base picture from real values and choose the next correction.
Every item is a focused ICU decision with four options — the exact CCRN format.
Exhibits are illustrative of the question style. The CCRN® exam is multiple-choice; CertifyRN mirrors that format.
Free CCRN study guides — no login needed. Learn the Synergy Model, drill acid–base and hemodynamics, and walk in on test day knowing exactly what to expect.
The Synergy Model, ABG interpretation in 4 steps, hemodynamics, treating the unstable patient, and ICU pacing.
Read the guide →Format, the ~75% passing standard, and the full Synergy Model blueprint with every domain weight.
See the format →AACN eligibility, what to bring, and how to pace all 150 items — an interactive checklist you can tick off.
Get ready →A domain dashboard shows exactly where you're losing points, so study time goes where it counts.
Full exam simulation mirrors the real CCRN timing and conditions — no surprises on test day.
Progress syncs across all your devices instantly, so you can practice on any break.
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Cardiogenic shock after a large anterior MI is a pump-failure problem — low cardiac output (index 1.6) against a high afterload. An inotrope such as dobutamine improves contractility and raises output, which most directly addresses the failing pump.
A crystalloid bolus adds volume and worsens the existing pulmonary congestion. A pure alpha-agonist raises afterload against an already failing pump. Immediate beta-blockade further lowers an output that is already dangerously low.
Insulin drives potassium into cells. With a serum potassium of 3.1 mEq/L, giving insulin first can trigger dangerous hypokalemia and arrhythmias, so potassium is replaced and insulin held until it exceeds 3.3 mEq/L.
Starting the infusion immediately pushes potassium even lower. A bicarbonate drip is not first-line in DKA and does nothing about the potassium risk. Subcutaneous insulin still shifts potassium into cells — changing the route doesn't remove the hypokalemia hazard.
Hypotension, jugular venous distension, and muffled heart sounds (Beck's triad), together with pulsus paradoxus — an inspiratory drop in systolic pressure greater than 10 mmHg — and low-voltage QRS, point to cardiac tamponade. The compressed heart cannot fill, so removing the pericardial fluid by pericardiocentesis is the definitive, life-saving intervention.
Lying flat and restricting fluids further lowers preload and worsens this obstructive shock — the filling-limited heart needs volume while drainage is arranged. Cardioversion treats unstable tachyarrhythmias, not a mechanical filling problem with an organized rhythm. Oxygen and monitoring alone ignore an immediately reversible cause that requires drainage.
Respiratory failure is defined by hypercapnia above 45 with hypoxemia below 60, and a low pH marks the process as acute rather than chronic. The depressed level of consciousness reflects the rising PaCO2 driving CNS depression.
A chronic compensated picture would show a near-normal pH with renal bicarbonate retention, which the acidotic pH rules out. A primary metabolic process would lower the bicarbonate rather than leave it slightly elevated. The gases show acidosis with CO2 retention, not the alkalosis of hyperventilation.
A mean pulmonary artery pressure above 25 mmHg defines pulmonary hypertension, and this tracing reads 41. The morphology is entirely normal, with a preserved upstroke and dicrotic notch, so the abnormality is in the scale rather than the shape. Reading contour alone and skipping the axis is the error this tracing is designed to expose.
A leveling error shifts all pressures together without preserving a normal contour at a plausibly elevated range. A wedged catheter shows a damped atrial waveform with a fall in mean pressure, not an elevated pulsatile tracing. Overdamping blunts the waveform and narrows the pulse pressure, which is not seen here.
In the app, every waveform question can show a labeled version once you have answered.
Yes. You can practice CCRN questions for free to start. The full 720+ question bank and exam simulation are included with an all-access CertifyRN subscription (monthly or annual, cancel anytime).
The CCRN bank has 720+ blueprint-aligned questions distributed across all six AACN domains in line with the official test plan, so your practice mix mirrors the real exam blueprint.
Yes. Questions are weighted to the official test plan: Cardiovascular 13%, Respiratory 12%, Endocrine / Hematology / GI / Renal / Integumentary 21%, Neurological / Musculoskeletal / Behavioral 18%, Multisystem 16%, and Professional Caring and Ethical Practice 20%.
No. CertifyRN is an independent study resource and is not affiliated with, endorsed by, or sponsored by AACN Certification Corporation. CCRN is a registered trademark of its respective owner.
As you practice, CertifyRN tracks performance by domain and shows which areas need the most work, so your study targets your weakest domains first. Full exam simulation mirrors real testing conditions.
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Start practicing freeCertifyRN is an independent study resource and is not affiliated with, endorsed by, or sponsored by the American Association of Critical-Care Nurses (AACN) or the AACN Certification Corporation. CCRN® is a registered trademark of its respective owner, used here for identification only. CertifyRN provides original practice materials and does not reproduce official exam content.