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 D
Explanation
A. Junctional tachycardia: Junctional tachycardia originates from the AV node, typically with a narrow QRS, absent or inverted P waves, and a rate of 100–180 bpm. The strip does not show these features.
B. Second-degree Type II AV block (3:1).Type II AV block (Mobitz II) shows dropped QRS complexes with constant PR intervals before conducted beats. This strip does not show missing QRS complexes in a 3:1 pattern.
C. Ventricular fibrillation. VF is characterized by a chaotic, disorganized rhythm with no discernible P waves, QRS complexes, or T waves, completely different from this organized flutter pattern.
D. Atrial flutter is characterized by regular, rapid atrial depolarizations (flutter waves) at a rate of 250–350 bpm. These waves create a "sawtooth" pattern on the ECG.The ventricular response may be regular or irregular, depending on AV conduction. This is different from atrial fibrillation (which has irregularly irregular R-R intervals and no discrete P waves).
Correct Answer is A
Explanation
A. Provide a bedside table for the client to lean across. Clients with acute pancreatitis often experience severe epigastric pain that radiates to the back. Leaning forward helps reduce pressure on the inflamed pancreas and relieves pain by minimizing peritoneal irritation. Providing a bedside table allows the client to rest in a comfortable, supported position, improving pain management without additional interventions.
B. Place bed in the reverse Trendelenburg position. Reverse Trendelenburg elevates the head and lowers the feet, which does not specifically relieve pain associated with pancreatitis. The client instinctively leans forward for relief, and adjusting the bed position would not provide the same benefit. This intervention does not directly address the underlying cause of discomfort.
C. Encourage bed rest until analgesic takes effect. Although pain control is essential, keeping the client in a supine or bedrest position can increase abdominal pressure and worsen discomfort. Allowing the client to assume a comfortable position enhances the effectiveness of analgesics and prevents unnecessary distress. Pain relief strategies should focus on both pharmacologic and positioning interventions.
D. Raise the head of the bed to a 90-degree angle. Elevating the head of the bed can improve breathing and reduce reflux, but it does not provide the same pressure relief as leaning forward. Sitting upright without forward support does not effectively relieve peritoneal irritation from pancreatic inflammation. Providing a bedside table supports proper positioning and enhances comfort.
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