The patient is admitted with a suspected acute myocardial infarction (AMI). In assessing the 12-lead electrocardiogram (ECG) changes, which findings would indicate to the nurse that the patient is in the process of a myocardial infarction (MI)?
Depressed ST-segment on ECG and elevated total CPK
Depressed ST-segment on ECG and normal cardiac enzymes
ST-segment elevation on ECG and elevated CK-MB or troponin levels
Q wave on ECG with normal enzymes and troponin levels
The Correct Answer is C
Rationale:
A. A depressed ST-segment is often associated with ischemia or non-ST elevation myocardial infarction (NSTEMI), not an ongoing MI.
B. A depressed ST-segment with normal cardiac enzymes suggests ischemia rather than an active MI.
C. ST-segment elevation on ECG combined with elevated cardiac biomarkers such as CK-MB or troponin levels is a hallmark of an acute ST-segment elevation myocardial infarction (STEMI), indicating an ongoing MI.
D. A Q wave on ECG indicates an old infarction and is not associated with an acute MI if enzymes and troponin levels are normal.
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Correct Answer is ["B","C","E"]
Explanation
Rationale:
A. Crackles are more commonly associated with left ventricular failure, which leads to pulmonary congestion.
B. Hepatomegaly, or an enlarged liver, is a sign of right ventricular failure due to blood backing up in the systemic circulation.
C. Jugular venous distention is a classic sign of right ventricular failure as blood accumulates in the venous system.
D. Orthopnea, or difficulty breathing while lying down, is more indicative of left ventricular failure.
E. Peripheral edema is a hallmark of right ventricular failure, resulting from increased venous pressure.
Correct Answer is A
Explanation
Rationale:
A. Thrombolytic therapy is the priority in managing an ST-elevated myocardial infarction (STEMI) when percutaneous coronary intervention (PCI) is not available. It helps dissolve the blood clot causing the blockage in the coronary artery.
B. Maintaining oxygen saturation is important, but the priority is to restore coronary blood flow.
C. The focus should be on stabilizing the heart rhythm, not specifically maintaining a high heart rate.
D. Diuretics are important in managing heart failure but are not the priority in acute STEMI management.