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

▸ Why B is the answer

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?

▸ Why B is the answer

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)?

▸ Why B is the answer

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.

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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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