A patient is having a cardiac evaluation to assess for possible heart failure and valvular disease. Which study best identifies heart function and measures the size of the cardiac chambers?
Electrophysiology study
12-lead electrocardiogram
Cardiac catheterization
Echocardiogram
The Correct Answer is D
A. An electrophysiology study assesses the electrical activity of the heart but does not evaluate heart function or chamber size.
B. A 12-lead electrocardiogram records the electrical activity of the heart but does not provide detailed information on heart function or chamber size.
C. Cardiac catheterization is an invasive procedure used to assess coronary artery disease and other structural heart conditions but is not the primary study for evaluating heart function and chamber size.
D. An echocardiogram is a non-invasive ultrasound that provides detailed images of the heart, including its function, chamber size, and valve function, making it the best choice for this purpose.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Coronary artery bypass graft (CABG) surgery is typically recommended for patients with significant occlusion of the left main coronary artery, as it effectively restores blood flow to the heart muscle by bypassing the blocked artery.
B. Radiofrequency catheter ablation is used to treat arrhythmias, not coronary artery occlusions.
C. Implantable cardioverter-defibrillator (ICD) placement is for managing life-threatening arrhythmias, not directly for treating coronary artery blockages.
D. A circulatory assist device is used in severe cases of heart failure, but it does not address the underlying issue of coronary artery occlusion.
Correct Answer is D
Explanation
A. CK-MB is a cardiac enzyme that rises in response to myocardial injury, but it is less specific and takes longer to rise than troponin.
B. BNP is associated with heart failure, not myocardial infarction.
C. Myoglobin is an early marker but is non-specific, as it rises with any muscle damage.
D. Troponin is the most specific and sensitive biomarker for myocardial infarction. It rises within 3-4 hours after myocardial injury and remains elevated for days, making it the most useful test for confirming an MI.
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