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.

Answer and Explanation

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.

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Correct Answer is ["C","D"]

Explanation

A. Low PaO2. Clients with DKA do not typically have significant hypoxemia unless there is concurrent respiratory compromise. The primary issue in DKA is metabolic acidosis rather than oxygenation.
B. Low lactic acid. Lactic acidosis is not a hallmark of DKA. Instead, DKA is characterized by ketone production from fatty acid metabolism. Elevated lactic acid is more common in conditions like sepsis or tissue hypoxia.
C. Low pH. Diabetic ketoacidosis (DKA) causes metabolic acidosis due to the accumulation of ketone bodies, leading to a pH below 7.35. The absence of insulin results in unregulated lipolysis and ketogenesis, significantly lowering blood pH.
D. Low bicarbonate (HCO3-). In metabolic acidosis, bicarbonate acts as a buffer and gets depleted while neutralizing excess acids. Clients with DKA typically have a bicarbonate level below 18 mEq/L (18 mmol/L), confirming metabolic acidosis.
E. High PaCO2. In metabolic acidosis, respiratory compensation leads to hyperventilation (Kussmaul respirations), causing PaCO2 to decrease as the body attempts to blow off excess CO2 to normalize pH.

Correct Answer is ["5"]

Explanation

Calculation:

Calculate the New Nitroglycerin Dose in mcg/hour

Dose (mcg/hour) = Dose (mcg/min) × 60 min/hour

=15 mcg/min × 60 min/hour = 900 mcg/hour

Convert mcg to mg

Dose (mg/hour) = Dose (mcg/hour) / 1000 mcg/mg

=900 mcg/hour / 1000 mcg/mg

= 0.9 mg/hour

Calculate the Concentration of Nitroglycerin in the IV Bag

Concentration (mg/mL) = Total mg of Nitroglycerin / Total mL of Solution

=50 mg / 250 mL

= 0.2 mg/mL

Calculate the Infusion Rate = Infusion Rate (mL/hour)

=0.9 mg/hour / 0.2 mg/mL

= 4.5 mL/hour

Round to the Nearest Whole Number

4.5 mL/hour rounded to 5 mL/hour

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Naxlex Comprehensive Predictor Exams

Exhibits Based on the client's diagnosis, which results does the nurse expect in the blood gas? Select all that apply

Correct Answer is ["C","D"]

Explanation

Correct Answer is ["5"]

Explanation

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