A nurse is providing care and education to a client after an acute myocardial infarction. Which of the following statements should the nurse make regarding cardiac enzyme studies?
"Cardiac enzymes assist in diagnosing the presence of pulmonary congestion."
"These tests will enable the provider to determine the heart structure and mobility of the heart valves."
"These tests help determine the degree of damage to the heart tissues."
"Cardiac enzymes will identify the location of the MI."
The Correct Answer is C
A. Cardiac enzymes do not diagnose pulmonary congestion. Pulmonary congestion is typically assessed using imaging, such as a chest X-ray or echocardiography.
B. Cardiac enzyme tests do not assess heart structure or valve mobility. An echocardiogram or cardiac MRI is used for that purpose.
C. Cardiac enzymes, such as troponins and creatine kinase-MB (CK-MB), indicate the extent of myocardial damage and are essential for diagnosing and managing acute myocardial infarction.
D. Cardiac enzymes confirm myocardial injury but do not pinpoint the exact location of the infarction. The location is determined using ECG findings and imaging studies.
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Related Questions
Correct Answer is D
Explanation
A. Complete heart block (third-degree AV block) is characterized by a complete dissociation between atrial and ventricular activity, with P waves and QRS complexes occurring independently of each other.
B. Sinus tachycardia presents with a regular rhythm, a heart rate above 100 beats per minute, and distinct P waves preceding each QRS complex.
C. Idioventricular rhythm occurs when the heart's primary pacemakers fail, leading to a slow ventricular rate (usually 20-40 bpm) with wide QRS complexes and no preceding P waves.
D. Ventricular tachycardia (VT) is a life-threatening arrhythmia characterized by a rapid ventricular rate (typically >100 bpm), wide QRS complexes, and an absence of P waves. VT can be sustained or non-sustained and may require immediate intervention if the patient is unstable.
Correct Answer is C
Explanation
A. A new systolic murmur is more indicative of valvular dysfunction or a septal defect rather than pericardial effusion.
B. Diminished breath sounds may be associated with atelectasis or pleural effusion but are not a hallmark finding of pericardial effusion.
C. Diminished heart sounds occur due to fluid accumulation in the pericardial sac, which muffles heart tones and is a key sign of pericardial effusion.
D. Increased blood pressure is not characteristic of pericardial effusion. Instead, pericardial effusion can lead to cardiac tamponade, which typically causes hypotension.
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