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CMSRN: Myocardial Infarction

Recognizing and responding to a myocardial infarction is critical med-surg knowledge. These CMSRN questions cover MI presentation, priority interventions, medications, and monitoring — with a full rationale for each.

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  • 🔍 Hint highlights — the decisive cue phrases in each stem
  • 📖 Full rationales — why every option is right or wrong

Every CMSRN question is written to the current exam outline for quick learning and a clear pass strategy.

Written and reviewed by the LexPort exam-prep team, led by our Founder & Exam-Prep Lead. LexPort builds certification practice questions — this is exam-preparation material, not medical advice. Last reviewed August 2026.

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Test yourself: Myocardial Infarction

Three CMSRN practice questions on myocardial infarction — tap an answer for instant feedback. The app has 5,200+, timed and scored.

Question 1

A telemetry monitor fails during a power surge, and a patient with recent myocardial infarction develops sudden dyspnea. Backup batteries are depleted. Which action takes precedence?

▸ Why A is the answer

During equipment failure, direct clinical assessment replaces unavailable technology, especially with acute symptoms (dyspnea post-MI). Auscultation identifies pulmonary edema or arrhythmias faster than awaiting resources. Option B delays assessment for equipment that may not resolve immediate clinical needs. Option C risks instability during transfer without initial evaluation. Option D assumes respiratory etiology without assessment, potentially delaying cardiac intervention. The recent MI and sudden onset prioritize hands-on evaluation per ACLS guidelines.

Question 2

A hospital’s Value-Based Purchasing report identifies suboptimal management of acute myocardial infarction (AMI) core measures. When admitting a 62-year-old with STEMI, which nursing intervention prioritizes both clinical guidelines and reimbursement metrics?

▸ Why A is the answer

AMI core measures require aspirin administration within 10 minutes of arrival for STEMI. Option A meets this CMS quality metric (discriminating cue: STEMI diagnosis), directly impacting reimbursement. Option B delays time-sensitive intervention. Option C prioritizes history over emergent care. Option D contradicts pain management in ACS guidelines. All relate to AMI care, but A adheres strictly to the "door-to-drug" standard that influences value-based payment calculations.

Question 3

A Mexican-American patient refuses prescribed antidepressants after myocardial infarction, stating, "Nervios needs curandero herbs." The nurse notes untreated depression affects cardiac recovery. Which approach demonstrates cultural humility?

▸ Why B is the answer

Integrating cultural beliefs promotes adherence. Option A dismisses cultural practices. Option C invalidates the patient's explanatory model. Option D undermines autonomy. The NIH Framework for Cultural Humility supports complementary approaches when safe, consistent with CMSRN's patient-centered care standards.

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Question 1

A patient with acute myocardial infarction is receiving thrombolytic therapy. Which finding indicates successful reperfusion?

  • A) A) Persistent ST segment elevation on ECG
  • B) B) Resolution of chest pain and ST segment normalization✓
  • C) C) Continuous increase in troponin levels
  • D) D) Development of bradycardia and hypotension
Show rationale

Resolution of chest pain and ST segment normalization indicate successful reperfusion and restoration of blood flow to the myocardium. ST segments should return to baseline, not remain elevated. Troponin levels rise with any MI damage regardless of reperfusion success. Bradycardia and hypotension are not reliable indicators of successful reperfusion.

Question 2

A patient is receiving IV nitroglycerin for unstable angina. Which vital sign requires the most frequent monitoring?

  • A) A) Respiratory rate and oxygen saturation
  • B) B) Blood pressure every 5-15 minutes✓
  • C) C) Core body temperature hourly
  • D) D) Oxygen saturation continuously
Show rationale

Nitroglycerin causes vasodilation and can lead to hypotension. Blood pressure must be monitored every 5-15 minutes during IV administration to prevent severe hypotensive episodes that could worsen myocardial perfusion. While other vitals are important, blood pressure is the priority with nitrate therapy.

Question 3

A patient with acute MI is prescribed aspirin, clopidogrel, heparin, and a beta blocker. Which represents dual antiplatelet therapy (DAPT)?

  • A) A) Aspirin and heparin
  • B) B) Aspirin and clopidogrel✓
  • C) C) Clopidogrel and heparin
  • D) D) Beta blocker and aspirin
Show rationale

Dual antiplatelet therapy (DAPT) consists of aspirin plus a P2Y12 inhibitor (clopidogrel, ticagrelor, or prasugrel). Heparin is an anticoagulant, not an antiplatelet. DAPT is standard post-MI and post-stent to prevent thrombosis.

Question 4

A patient with acute MI is started on a heparin drip. The aPTT is 110 seconds (control 30 seconds). What action should the nurse take?

  • A) A) Continue current rate, aPTT is therapeutic
  • B) B) Decrease the infusion rate per protocol✓
  • C) C) Stop the infusion immediately
  • D) D) Increase the infusion rate
Show rationale

Therapeutic aPTT for heparin is 1.5-2.5 times control (45-75 seconds for control of 30). aPTT of 110 is >3.5 times control, indicating supratherapeutic levels and bleeding risk. Decrease rate per protocol. Don't stop completely unless bleeding occurs.

Question 5

What is the recommended first-line treatment for stable angina?

  • A) A) Immediate coronary artery bypass surgery
  • B) B) Sublingual nitroglycerin and lifestyle modifications✓
  • C) C) High-dose aspirin therapy alone
  • D) D) Cardiac catheterization within 24 hours
Show rationale

Stable angina is initially managed with sublingual nitroglycerin for acute episodes, plus lifestyle modifications (diet, exercise, smoking cessation) and medications (beta blockers, antiplatelet agents). Surgery is for refractory cases. Catheterization is diagnostic, not first-line treatment.

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CMSRN · Exam Simulator

A patient with acute myocardial infarction is receiving thrombolytic therapy. Which finding indicates successf…

A) A) Persistent ST segment elevation on EC
B) B) Resolution of chest pain and ST segme
C) C) Continuous increase in troponin level
D) D) Development of bradycardia and hypote
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