After 15 minutes of cardiopulmonary resuscitation (CPR) and multiple defibrillations, a client has return of spontaneous circulation (ROSC) with a heart rate of 130 beats/minute and ST elevation in leads I,II, III, aVF, aVL, V5, V6. Which serum laboratory values are most important for the nurse to monitor?
Creatine kinase-MB (CK-MB).
Serum glutamic pyruvic transaminase (SGPT).
Lactate dehydrogenase (LDH).
Cardiac troponin.
The Correct Answer is D
A. Creatine kinase-MB (CK-MB). CK-MB is a cardiac enzyme that rises 3-6 hours after myocardial injury and was previously used to diagnose myocardial infarction (MI). However, it is less specific than troponin and can be elevated in skeletal muscle damage, making troponin the preferred biomarker for cardiac injury.
B. Serum glutamic pyruvic transaminase (SGPT). SGPT (also known as alanine aminotransferase [ALT]) is a liver enzyme and is not a primary marker for cardiac injury. While cardiac arrest and hypoxia can lead to liver damage, monitoring cardiac-specific markers is the priority in this scenario.
C. Lactate dehydrogenase (LDH). LDH is a nonspecific marker of tissue damage that can be elevated in cardiac, hepatic, renal, or other organ injuries. It is not cardiac-specific and is no longer used as a primary diagnostic tool for MI.
D. Cardiac troponin. Troponin (T and I) is the most specific and sensitive biomarker for myocardial injury. The presence of ST elevation in multiple leads suggests acute myocardial infarction (MI) as the cause of cardiac arrest. Troponin levels begin to rise within 2-3 hours, peak at 12-24 hours, and remain elevated for 7-10 days, making them the most important laboratory value to monitor for ongoing cardiac damage.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Prepare for oral intubation. The client is in severe respiratory distress with oxygen saturation at 88% despite receiving 100% oxygen via a nonrebreather mask. This suggests respiratory failure, likely due to a pulmonary embolism (PE), a known complication following bariatric surgery. Immediate intubation and mechanical ventilation are necessary to prevent further hypoxia and respiratory collapse.
B. Apply leg compression hose. While deep vein thrombosis (DVT) prophylaxis is essential for postoperative bariatric patients, it is not the priority in an acute emergency. Compression devices help prevent clots but do not treat an existing life-threatening pulmonary embolism.
C. Maintain head of bed at 45°. Elevating the head of the bed can help with breathing, but it will not significantly improve oxygenation in a client already failing on 100% oxygen. The priority is to secure the airway with intubation to provide controlled ventilation.
D. Administer an anticoagulant. Anticoagulation is a key treatment for pulmonary embolism, but it does not immediately improve oxygenation or stabilize respiratory function. In a hemodynamically unstable client with severe hypoxia, securing the airway takes priority before initiating anticoagulation therapy.
Correct Answer is D
Explanation
A. Prepare to give phenytoin IV as prescribed. Phenytoin is used for seizure prophylaxis in clients with moderate to severe head injuries (GCS ≤ 8–10). A GCS score of 14 indicates mild head injury, and prophylactic anticonvulsants may not be necessary unless ordered for specific risk factors.
B. Perform a substernal rub to evoke a response to pain. A substernal rub (painful stimulus) is used to assess response in unconscious or unresponsive clients (GCS ≤ 8). With a GCS of 14, the client is alert or nearly fully conscious, making a painful stimulus unnecessary and inappropriate.
C. Promptly notify the healthcare provider (HCP) of the GCS score. A GCS of 14 is not a critical or emergency finding, as it indicates mild neurological impairment. While the HCP should be updated on significant changes, routine monitoring is sufficient unless deterioration occurs.
D. Continue monitoring the client's GCS score every 2 hours. Frequent neurological assessments are crucial in head injury management to detect worsening conditions like increasing intracranial pressure (ICP) or cerebral edema. Monitoring the GCS every 2 hours ensures timely intervention if the client’s condition changes.
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