The patient is brought to the emergency department with...

The patient is brought to the emergency department with acute coronary syndrome (ACS). What changes should the nurse expect to see on the ECG if only myocardial injury has occurred?
a. Absent $\mathbf{P}$ wave
b. A wide $Q$ wave
c. Inverted $\mathrm{T}$ wave
d. ST segment elevation

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Key Concepts

Acute Coronary Syndrome (ACS)

ACS is an umbrella term for conditions where there is a sudden decrease in blood flow to the heart, often due to partial or complete blockage of a coronary artery. It encompasses a range of diagnoses from unstable angina to myocardial infarction, each with distinct clinical and electrocardiographic features.

Myocardial Injury

Myocardial injury involves damage to the heart muscle cells that may not have progressed to full-thickness myocardial infarction. It is detectable through cardiac biomarkers and specific electrocardiogram changes, distinguishing it from a complete infarction which shows more pronounced ECG abnormalities.

Electrocardiogram (ECG) Interpretation

The ECG is a crucial diagnostic tool that records the electrical activity of the heart. It enables healthcare professionals to identify specific patterns such as alterations in the ST segment, Q waves, and T waves, which can indicate myocardial ischemia, injury, or infarction.

Inverted T Wave

An inverted T wave on an ECG indicates altered ventricular repolarization, typically as a result of myocardial injury or ischemia. It serves as an important marker suggesting that the heart muscle is under stress or has sustained injury, even if complete infarction has not occurred.

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