NHM UP Staff Nurse - 2016
Medical Surgical Nursing
Easy
ECG changes in Myocardial infarction are?
Appeared in: NHM UP Staff Nurse - 2016
Explanation
- ST-segment elevation is the classic ECG finding for an acute ST-segment elevation myocardial infarction (STEMI).
- It signifies transmural (full-thickness) myocardial injury resulting from complete occlusion of a coronary artery.
- This finding is a critical diagnostic marker because it indicates the need for immediate reperfusion therapy (e.g., angioplasty or thrombolytics) to restore blood flow and save heart muscle.
- The elevation is seen in the ECG leads that correspond to the affected area of the heart.
Why Other Options Were Wrong
- Option B: A wide QRS complex indicates a delay in ventricular depolarization, not acute myocardial injury.
- Option C: The U wave is not associated with myocardial infarction.
- Option D: A prolonged PR interval indicates a delay in conduction from the atria to the ventricles, not acute ischemia.
Related Visual
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain ECG Interpretation in Myocardial Infarction as background academic context rather than a clinical decision trigger.
- Recognizing ST-segment elevation is a critical nursing skill. The mantra "time is muscle" emphasizes that rapid identification of a STEMI and activation of the cardiac catheterization lab or administration of thrombolytics is essential to minimize heart muscle damage.
- Nurses are responsible for continuous ECG monitoring of patients with chest pain to detect these changes, as well as monitoring for life-threatening arrhythmias that can complicate an MI.
- What if? If the ECG showed ST-segment depression instead of elevation, it would suggest a non-ST-segment elevation myocardial infarction (NSTEMI) or unstable angina. The management for NSTEMI is different and typically involves medication management initially, with less emergent cardiac catheterization compared to a STEMI.
How to Approach the Question
- First, identify the core concept of the question: 'ECG changes' and 'Myocardial Infarction'.
- Recall the classic, hallmark ECG findings associated with an acute MI. The most well-known sign is ST-segment elevation.
- Evaluate each option based on your knowledge. Ask yourself, 'Is this change primarily caused by an MI?'
- Option A, ST-segment elevation, is the direct and most critical sign of a STEMI.
- Options B, C, and D are associated with other conditions (conduction blocks, electrolyte imbalances) and are not the primary diagnostic markers for MI, even if they sometimes co-exist.
- Select the option that represents the most specific and urgent finding related to acute MI.
Concept Tested & Keywords
- Concept Tested: ECG Interpretation in Myocardial Infarction
- Stem keywords: ECG changes, Myocardial infarction
- Lead-in keywords: BEST, MOST RELEVANT CLUE
- Negative lead-in flag: false
Question ID
QounI1HpGYj8QiuZP00NzL
Reference Book
E6 Physiology Ganong 27e Vol 2 Part 1 p. 81-83
E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) p. 7320-7322
E6 Pathology-Textbook of PATHOLOGYHarsh Mohan Part 2 (215-514) p. 9-11
Practise the full NHM UP Staff Nurse - 2016
Attempt every question from this paper in a timed mock, then review the full solution for each one.
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