A nurse is providing care for a client who experienced a myocardial infarction prior to a cardiac arrest. Which of the following laboratory tests will identify early injury to the cardiac muscle?
Creatine kinase (CK) test
Creatine kinase-myocardial band (CK-MB) test
Brain natriuretic peptide (BNP) test
Troponin T test
The Correct Answer is D
A. Creatine kinase (CK) test: While creatine kinase isoenzymes, including CK-MB, can be elevated following myocardial infarction (MI), they are not specific to cardiac muscle injury. CK is found in various tissues throughout the body, so elevated levels can also indicate damage to skeletal muscle or brain tissue, among other sources.
B. Creatine kinase-myocardial band (CK-MB) test: CK-MB is a cardiac-specific isoform of creatine kinase, and elevated levels can indicate myocardial injury, particularly in the context of an acute MI. However, troponin T is a more sensitive and specific marker for myocardial injury.
C. Brain natriuretic peptide (BNP) test: Brain natriuretic peptide is primarily used in the diagnosis and management of heart failure. While elevated BNP levels can indicate heart muscle strain or stress, they are not specific markers for acute myocardial infarction or early injury to the cardiac muscle.
D. Troponin T test: This is the correct answer. Troponin T is a highly specific marker for cardiac muscle injury. Elevated troponin levels can be detected within hours of myocardial infarction and persist for several days, making it an essential tool in the diagnosis of acute coronary syndromes, including myocardial infarction. Troponin T is considered one of the gold standard biomarkers for detecting early injury to the cardiac muscle.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Myocardial infarction: Enteral nutrition initiation within 24 to 48 hours is not directly associated with preventing myocardial infarction. While proper nutrition is important for overall cardiovascular health, the timing of enteral nutrition initiation primarily focuses on preventing complications related to increased intracranial pressure (ICP).
B. Bacterial translocation: Initiating enteral nutrition within 24 to 48 hours in clients with increased intracranial pressure helps prevent complications such as bacterial translocation. Bacterial translocation refers to the passage of bacteria from the gastrointestinal tract into the bloodstream and systemic circulation. Delayed initiation of enteral nutrition can lead to intestinal mucosal breakdown and increased intestinal permeability, facilitating bacterial translocation. Early enteral nutrition helps maintain intestinal mucosal integrity, reduces gut bacterial overgrowth, and decreases the risk of bacterial translocation, thereby lowering the risk of infectious complications.
C. Pulmonary embolus: Initiating enteral nutrition within 24 to 48 hours is not directly associated with preventing pulmonary embolus. Pulmonary embolism is a complication characterized by the obstruction of pulmonary arteries by blood clots, typically originating from deep vein thrombosis. Prevention of pulmonary embolus involves measures such as early mobilization, pharmacological prophylaxis, and mechanical compression devices to prevent venous stasis and thrombus formation.
D. Deep vein thrombosis: Initiating enteral nutrition within 24 to 48 hours is not directly associated with preventing deep vein thrombosis. Deep vein thrombosis is a complication characterized by the formation of blood clots within deep veins, commonly in the lower extremities. Prevention of deep vein thrombosis involves measures such as early mobilization, pharmacological prophylaxis, and mechanical compression devices to prevent venous stasis and thrombus formation.
Correct Answer is A
Explanation
A. Atrial fibrillation: Atrial fibrillation is characterized by an irregularly irregular rhythm, absence of identifiable P waves, and irregular ventricular response. The heart rate in atrial fibrillation can be variable, and the absence of identifiable P waves indicates disorganized atrial electrical activity.
B. Sinus bradycardia: Sinus bradycardia is characterized by a regular rhythm with a heart rate less than 60 beats per minute (bpm) and normal P waves preceding each QRS complex. In sinus bradycardia, the PR interval and QRS duration are typically within normal limits.
C. Supraventricular tachycardia: Supraventricular tachycardia (SVT) is characterized by a regular rhythm with a heart rate greater than 100 bpm. SVT typically presents with narrow QRS complexes and may or may not have discernible P waves.
D. First-degree heart block: First-degree heart block is characterized by a prolonged PR interval (>0.20 seconds) but maintains a regular rhythm with normal QRS duration. In first-degree heart block, P waves are typically identifiable, and the rhythm is not irregular.
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