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ECG Rhythm Strip Practice Questions

Reading an ECG and knowing what to do next is a core med-surg skill. These CMSRN questions cover common rhythms and the appropriate nursing response, each with a full rationale.

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  • 💡 Key Takeaways — the one transferable rule per question
  • 🔍 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: ECG Interpretation

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

Question 1

A charge nurse on a 30-bed medical-surgical unit observes two experienced nurses arguing loudly at the nurses' station about conflicting interpretations of a new wound care protocol. One nurse states, "This policy compromises patient safety," while the other insists, "We must follow administrative directives." The unit is currently at full capacity with high-acuity patients. What conflict management approach should the charge nurse employ?

▸ Why B is the answer

Mediation addresses the core issue (policy safety concerns) while maintaining professionalism. Option A ignores legitimate safety discussions and may escalate conflict. Option C inappropriately escalates to discipline without first attempting resolution, per conflict management principles. Option D delays addressing urgent safety implications, which is inappropriate given high-acuity patients. The charge nurse must balance policy adherence with staff expertise, using mediation to foster collaborative problem-solving. Guidelines emphasize leader-facilitated dialogue for practice disagreements to preserve team cohesion and patient safety.

Question 2

A Mandarin-speaking patient post-hip replacement grimaces when repositioned but repeatedly says "fine" through their adult daughter's interpretation. The daughter appears stressed and rushes explanations. Which action best addresses communication needs?

▸ Why B is the answer

The Joint Commission mandates professional interpreters for clinical discussions to ensure accuracy and confidentiality. Family interpreters may omit/modify information due to emotional stress or bias, as suggested by rushed explanations and discordant nonverbal cues. While pain medications might be indicated, option B addresses the root communication barrier for comprehensive assessment. Option A risks misinterpretation; option C lacks nuance for complex symptoms; option D bypasses patient self-report, violating patient-centered care standards despite apparent distress indicators.

Question 3

A Spanish-speaking patient with uncontrolled diabetes presents with a foot ulcer. The emergency department triage note documents "no pain" via family interpretation, but the wound nurse's assessment using a professional interpreter notes severe pain. Which approach best resolves this inconsistency?

▸ Why D is the answer

Repeating assessment with a certified interpreter ensures linguistic accuracy per Joint Commission standards, addressing inconsistent reports from family vs. professional interpretation. Option A ignores potential errors in initial professional interpretation. Option B violates language access regulations by removing interpreter support. Option C avoids necessary nursing validation. Discrepancies in interpreted histories require reverification using appropriate linguistic resources to prevent clinical errors.

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Question 1

A patient develops atrial fibrillation with rapid ventricular response (HR 158). What is the immediate priority?

  • A) A) Prepare for synchronized cardioversion
  • B) B) Administer rate control medication (e.g., diltiazem)✓
  • C) C) Start anticoagulation therapy immediately
  • D) D) Perform carotid massage
Show rationale

For hemodynamically stable patients with rapid ventricular response in AFib, rate control with medications like diltiazem or metoprolol is the immediate priority. Cardioversion is for unstable patients. Anticoagulation is important but not immediate. Carotid massage is not first-line for AFib.

Question 2

What is the correct interpretation of this rhythm: regular rhythm, rate 180 bpm, narrow QRS, no visible P waves?

  • A) A) Sinus tachycardia
  • B) B) Supraventricular tachycardia (SVT)✓
  • C) C) Ventricular tachycardia
  • D) D) Atrial flutter
Show rationale

SVT presents with regular rhythm, rate >150 bpm (often 150-250), narrow QRS complexes, and P waves buried in T waves or not visible. Sinus tach rarely exceeds 150. VT has wide QRS. Atrial flutter has sawtooth pattern.

Question 3

What is the significance of a Q wave on ECG?

  • A) A) Active ischemia requiring immediate intervention
  • B) B) Old myocardial infarction with necrotic tissue✓
  • C) C) Normal variant in young athletes
  • D) D) Sign of pericarditis
Show rationale

Pathological Q waves (>1mm wide, >25% of R wave height) indicate old myocardial infarction with scar tissue. Necrotic tissue doesn't conduct electricity, creating the Q wave. Active ischemia shows ST changes. Small Q waves can be normal in some leads.

Question 4

A patient develops atrial fibrillation with rapid ventricular response (HR 158). What is the immediate priority?

  • A) A) Prepare for synchronized cardioversion
  • B) B) Administer rate control medication (e.g., diltiazem)✓
  • C) C) Start anticoagulation therapy immediately
  • D) D) Perform carotid massage
Show rationale

For hemodynamically stable patients with rapid ventricular response in AFib, rate control with medications like diltiazem or metoprolol is the immediate priority. Cardioversion is for unstable patients. Anticoagulation is important but not immediate. Carotid massage is not first-line for AFib.

Question 5

What is the correct interpretation of this rhythm: regular rhythm, rate 180 bpm, narrow QRS, no visible P waves?

  • A) A) Sinus tachycardia
  • B) B) Supraventricular tachycardia (SVT)✓
  • C) C) Ventricular tachycardia
  • D) D) Atrial flutter
Show rationale

SVT presents with regular rhythm, rate >150 bpm (often 150-250), narrow QRS complexes, and P waves buried in T waves or not visible. Sinus tach rarely exceeds 150. VT has wide QRS. Atrial flutter has sawtooth pattern.

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CMSRN · Exam Simulator

A patient develops atrial fibrillation with rapid ventricular response (HR 158). What is the immediate priorit…

A) A) Prepare for synchronized cardioversio
B) B) Administer rate control medication (e
C) C) Start anticoagulation therapy immedia
D) D) Perform carotid massage
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