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 C
Explanation
A. An INR of 2 is within the therapeutic range for anticoagulation but is more relevant for warfarin therapy rather than heparin.
B. An aPTT of 80 seconds is slightly elevated but not immediately life-threatening. The therapeutic range for heparin is typically 1.5 to 2.5 times the normal value (approximately 60-80 seconds).
C. Sudden weakness of one arm and leg suggests a possible embolic stroke, which is a serious complication of atrial fibrillation. This requires immediate assessment and intervention.
D. An irregular heart rate without P waves is characteristic of atrial fibrillation but is not the most urgent concern compared to potential stroke symptoms.
Correct Answer is A
Explanation
A. Elevated troponins are the most specific and sensitive markers for myocardial injury. Troponin I and Troponin T levels rise within a few hours of an AMI and remain elevated for days, confirming cardiac damage.
B. Elevated hemoglobin is not an indicator of cardiac injury. Hemoglobin levels are used to assess oxygen-carrying capacity and anemia.
C. Elevated B-type natriuretic peptide (BNP) is a marker for heart failure, not acute myocardial infarction.
D. Elevated creatine kinase (CK), particularly CK-MB, can indicate muscle injury, including cardiac injury, but it is less specific than troponins for diagnosing AMI.
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