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. Administer a PRN bolus normal saline. The client is exhibiting signs of hypovolemic shock, including tachycardia (HR 110 bpm), tachypnea (RR 24), and hypotension (BP 80/50 mmHg) following massive gastrointestinal bleeding and multiple blood transfusions. Immediate fluid resuscitation with a normal saline bolus is the priority to restore intravascular volume, maintain perfusion, and prevent further deterioration.
B. Obtain a blood specimen for hematocrit. While monitoring hematocrit is important to assess ongoing blood loss, it does not take priority over treating the client’s current hypovolemia. A delay in resuscitation could worsen hypotension, decrease organ perfusion, and lead to shock.
C. Measure strict hourly urinary output. Monitoring urine output is important in assessing renal perfusion and fluid balance, but the client’s immediate need is volume replacement. If fluid resuscitation is delayed, renal perfusion could worsen, leading to acute kidney injury.
D. Switch oxygen delivery to a face mask. The client’s oxygen saturation is 94% on 4 L/min nasal cannula, indicating adequate oxygenation at this time. Increasing oxygen delivery is not immediately necessary compared to fluid resuscitation. However, if the client’s condition worsens, oxygen therapy adjustments may be needed.
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.
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