Aacn Cmc (Cardiac Medicine Certification) Exam Prep & Review Guide: 200 High-Yield Practice Questions With Verified Answers And Clinical Rationales – Covering Hemodynamic Monitoring, Ventilator Management, Iabp Therapy, Shock Syndromes, Arrhythmia Interpr

AACN CMC (CARDIAC MEDICINE CERTIFICATION) EXAM PREP & REVIEW GUIDE: 200 HIGH-YIELD PRACTICE QUESTIONS WITH VERIFIED ANSWERS AND CLINICAL RATIONALES – COVERING HEMODYNAMIC MONITORING, VENTILATOR MANAGEMENT, IABP THERAPY, SHOCK SYNDROMES, ARRHYTHMIA INTERPRETATION, PHARMACOLOGY, AND MECHANICAL COMPLICATIONS FOR THE CERTIFICATION CYCLE 1. A patient with an acute anterior wall myocardial infarction develops sudden shortness of breath, tachycardia, and hypotension. Auscultation reveals a new, loud holosystolic murmur at the left sternal border. Which complication should the nurse suspect? A. Papillary muscle rupture B. Ventricular septal defect C. Free wall rupture D. Pericarditis Correct Answer: B. Ventricular septal defect Rationale: A new holosystolic murmur accompanied by signs of acute heart failure and hemodynamic compromise following a STEMI is classic for ventricular septal defect (VSD), a mechanical complication of MI. 2. The nurse is caring for a patient with a pulmonary artery catheter. The hemodynamic profile shows a cardiac index (CI) of 1.8 L/min/m², a systemic vascular resistance (SVR) of 1600 dynes/sec/cm⁻⁵, and a pulmonary artery wedge pressure (PAWP) of 22 mmHg. Which condition is most consistent with this profile? A. Septic shock B. Cardiogenic shock C. Hypovolemic shock D. Anaphylactic shock Correct Answer: B. Cardiogenic shock Rationale: Cardiogenic shock is characterized by low cardiac output (CI 2.2 L/min/m²) with compensatory vasoconstriction (high SVR 1200 dynes/sec/cm⁻⁵) and elevated left ventricular filling pressures (PAWP 18 mmHg), representing a "cold shock" profile. 3. When interpreting an arterial blood gas (ABG) for a patient on mechanical ventilation, which parameter directly reflects the adequacy of alveolar ventilation? A. PaO₂ B. PaCO₂ C. pH D. HCO₃⁻ Correct Answer: B. PaCO₂ Rationale: PaCO₂ is inversely proportional to alveolar ventilation. An increase in PaCO₂ indicates hypoventilation, while a decrease indicates hyperventilation. 4. A patient is receiving an infusion of sodium nitroprusside (Nipride) for hypertensive emergency. Which adverse effect requires immediate nursing intervention? A. Tachycardia B. Cyanide toxicity C. Hyperglycemia D. Bradycardia Correct Answer: B. Cyanide toxicity Rationale: Sodium nitroprusside is metabolized to cyanide, which can cause toxicity, especially with prolonged infusion or high doses. Signs include metabolic acidosis, altered mental status, and refractory hypotension. 5. The nurse notes that the arterial line waveform decreases significantly with each inspiration by the patient. This finding is most consistent with which condition? A. Cardiac tamponade B. Tension pneumothorax C. Pulmonary embolism D. Severe asthma Correct Answer: A. Cardiac tamponade Rationale: An inspiratory decline in systolic blood pressure greater than 10 mmHg is pulsus paradoxus, which is a classic sign of cardiac tamponade. 6. A patient with chronic kidney disease is being discharged on aspirin therapy following an AMI. This patient is at greatest risk for which complication? A. Gastric ulcer B. Bleeding C. Recurrent MI D. Renal failure Correct Answer: B. Bleeding Rationale: Chronic kidney failure increases the risk of bleeding due to impaired platelet aggregation and adhesion, as well as an altered response to clotting factors. 7. During the deflation phase of the intra-aortic balloon pump (IABP), the patient benefits from which hemodynamic effect? A. Increased coronary artery perfusion B. Decreased afterload C. Increased preload D. Decreased cardiac output Correct Answer: B. Decreased afterload Rationale: IABP deflation decreases aortic pressure, reducing systemic vascular resistance (afterload), which in turn improves cardiac output. 8. Which monitoring parameter is the best choice for evaluating the balance between tissue oxygen delivery and consumption? A. PAOP B. SvO₂ C. SVR D. EF Correct Answer: B. SvO₂ Rationale: Mixed venous oxygen saturation (SvO₂) reflects the balance between oxygen delivery and consumption, making it a valuable parameter for guiding treatment in critically ill patients. 9. Following a STEMI, the nurse notes petechial spotting in the lower extremities. This finding should prompt the nurse to suspect which condition? A. Heparin-induced thrombocytopenia (HIT) B. Disseminated intravascular coagulation (DIC) C. Acute kidney injury D. Peripheral vascular disease Correct Answer: A. Heparin-induced thrombocytopenia (HIT) Rationale: Petechiae in patients with suspected HIT are due to small thrombi from antibodies attaching to heparin molecules, obstructing the microvasculature. The patient likely received heparin therapy for the STEMI. 10. Which patient is most likely to be successfully extubated early? A. A patient with a cardiac index (CI) of 4.0 L/min/m² while on IABP B. A patient with a tidal volume of 3.3 mL/kg during a spontaneous breathing trial (SBT) C. A patient with a minute ventilation of 6 L/min while ventilated D. A patient with a MAP of 59 mmHg on dobutamine 5 mcg/kg/min Correct Answer: A. A patient with a CI of 4.0 L/min/m² while on IABP Rationale: A CI of 4.0 L/min/m² indicates adequate cardiac output and suggests the patient can tolerate early extubation without increased strain. 11. A patient with a history of vasculitis and cocaine abuse is admitted with altered mental status. A CT scan reveals an intracerebral hemorrhagic stroke. Which intervention should the nurse anticipate? A. Immediate fibrinolytic therapy B. Administration of furosemide (Lasix) C. Avoidance of hypotonic fluids D. Initiation of a sympathomimetic agent Correct Answer: C. Avoidance of hypotonic fluids Rationale: Hypotonic fluids can increase intracranial pressure (ICP). Hypertonic or isotonic fluids are recommended to prevent or reduce ICP elevation. 12. While weaning from the ventilator on SIMV, pressure support (PS) is added primarily to: A. Increase functional residual capacity