- What is the nurse's priority assessment?
Answer: Evaluate for sources of pain or inadequate sedation.
NMBAs cause paralysis but provide no analgesic or sedative effects. Tachycardia and hypertension in a paralyzed patient are classic signs of a stress response, most often due to pain or inadequate sedation (i.e., the patient is 'awake' but paralyzed). The priority is to assess for and treat this distress, as it is a critical safety issue.
- What is the nurse's most appropriate initial action?
Answer: Stop the infusion and assess the IV site for infiltration.
Potassium chloride is a vesicant and can cause severe phlebitis and tissue damage if it infiltrates. The combination of severe pain, redness, and swelling strongly suggests infiltration. The absolute first priority is to stop the infusion to prevent further tissue injury, then assess the site and follow protocols for managing infiltration.
- At what rate in mL/hr should the nurse program the infusion pump?
Answer: 15.0 mL/hr
Multi-step calculation is required:
1. Calculate the required dose in mcg/min: 0.05 mcg/kg/min * 80 kg = 4 mcg/min.
2. Calculate the required dose in mcg/hr: 4 mcg/min * 60 min/hr = 240 mcg/hr.
3. Calculate the concentration of the solution: 4 mg = 4000 mcg. So, 4000 mcg / 250 mL = 16 mcg/mL.
4. Calculate the infusion rate in mL/hr: (240 mcg/hr) / (16 mcg/mL) = 15 mL/hr.
- The nurse should suspect toxicity from which metabolite of this high-alert medication?
Answer: Cyanide
Sodium nitroprusside is metabolized to nitric oxide (the therapeutic molecule) and five cyanide ions. Cyanide is then converted in the liver to the less toxic thiocyanate, which is excreted by the kidneys. In cases of prolonged infusion, high doses, or underlying liver/kidney disease, cyanide can accumulate, leading to toxicity by inhibiting aerobic metabolism. This results in lactic acidosis, CNS changes, and cardiovascular collapse.
- Which finding is the most definitive indicator of magnesium toxicity that requires the nurse to stop the infusion immediately?
Answer: The absence of patellar reflexes.
While respiratory depression is a life-threatening sign of magnesium toxicity, the loss of deep tendon reflexes (DTRs) is an earlier and more reliable clinical sign. The progression of toxicity is typically loss of DTRs, followed by respiratory depression, and then cardiac arrest. Feeling flushed is a common side effect, not a sign of toxicity. Decreased contractions is a therapeutic effect.
- These new symptoms should prompt a priority evaluation for which known, serious adverse effect of long-term amiodarone therapy?
Answer: Chronic interstitial pneumonitis or pulmonary fibrosis.
Pulmonary toxicity is one of the most serious adverse effects of amiodarone. It can be insidious in onset and often presents with a non-productive cough, dyspnea on exertion, and pleuritic chest pain. Given the potential for irreversible lung damage, these symptoms require immediate investigation, typically starting with a chest X-ray and pulmonary function tests.
- What is the most appropriate initial nursing action?
Answer: Notify the provider of the tachyarrhythmia.
Dobutamine is a positive inotrope and chronotrope that can cause tachyarrhythmias, which is a primary dose-limiting side effect. The development of significant tachycardia and ventricular ectopy indicates the patient may be receiving too much of the drug. The nurse's first action should be to notify the provider, who will likely order a reduction in the infusion rate. Administering another drug or checking labs are secondary actions.
- What is the most likely reason for the recurrent and prolonged hypoglycemia in this patient?
Answer: Accumulation of active metabolites due to renal impairment.
Glyburide is a long-acting sulfonylurea with active metabolites that are cleared by the kidneys. In patients with renal impairment, these metabolites can accumulate, leading to severe, prolonged, and recurrent hypoglycemia that can persist for more than 24 hours. This makes it a high-risk medication in the elderly and those with kidney disease.
- After attempting to stimulate the patient, which action should the nurse perform immediately?
Answer: Administer a dose of naloxone intravenously as per protocol.
The patient is exhibiting clear signs of severe opioid-induced respiratory depression. While all options are relevant, the immediate, life-saving intervention is the administration of an opioid antagonist, naloxone, to reverse the effects of the morphine. This action directly addresses the root cause of the hypoventilation and should be performed concurrently with stopping the pump and calling for help.
- The nurse anticipates that the provider will order a STAT serum digoxin level and which other crucial laboratory test?
Answer: Serum potassium level.
The patient's symptoms are classic for digoxin toxicity, which is exacerbated by renal impairment. Hypokalemia significantly potentiates the effects of digoxin on the myocardium, increasing the risk of arrhythmias. Therefore, assessing the serum potassium level is as critical as checking the digoxin level itself to guide immediate management.
- This constellation of findings is most characteristic of which high-alert medication complication?
Answer: Propofol-related infusion syndrome (PRIS)
Propofol-related infusion syndrome (PRIS) is a rare but fatal complication of prolonged, high-dose propofol infusion. It is characterized by acute refractory bradycardia leading to asystole, severe metabolic acidosis, rhabdomyolysis (elevated CK), hyperlipidemia, and renal failure.
- What is the most likely cause of the patient's supratherapeutic INR?
Answer: A drug-drug interaction between warfarin and the antibiotic.
Sulfamethoxazole-trimethoprim is a potent inhibitor of the CYP2C9 enzyme, which is responsible for metabolizing the more active S-isomer of warfarin. This interaction decreases warfarin clearance, leading to a significant increase in INR and bleeding risk. The timing of the INR rise corresponds directly with the initiation of the antibiotic.
- The nurse should prioritize monitoring for which signs of increased methotrexate toxicity resulting from this delay?
Answer: Nephrotoxicity and severe mucositis.
Leucovorin (folinic acid) rescues normal cells from the effects of the folate antagonist methotrexate. A delay in its administration allows methotrexate to remain active longer, increasing its toxicity to rapidly dividing cells. The most prominent and dangerous toxicities are acute kidney injury (from methotrexate precipitation in renal tubules) and severe mucositis (damage to the GI tract lining).
- Which parameter provides the earliest and most sensitive indication of midazolam-induced respiratory depression?
Answer: The rise in the end-tidal CO2 level.
End-tidal CO2 (capnography) is the most sensitive indicator of hypoventilation. A rising ETCO2 indicates that the patient is not effectively eliminating carbon dioxide, which is the direct result of respiratory depression. This change is often detectable before a significant drop in respiratory rate or oxygen saturation occurs, making it the earliest warning sign.
- At this stage of treatment, the nurse should prioritize monitoring for which electrolyte imbalance?
Answer: Hypokalemia due to intracellular shifts.
During DKA treatment, insulin therapy drives potassium from the extracellular fluid back into the cells, along with glucose. Patients with DKA often have a total body potassium deficit despite having normal or high serum levels initially due to acidosis. As treatment corrects the acidosis and hyperglycemia, serum potassium can drop precipitously, leading to potentially fatal cardiac arrhythmias. Therefore, frequent monitoring and replacement of potassium is a critical priority.
- Which piece of information is most critical for the team to obtain to guide the decision-making process for reversal?
Answer: The time the last dose of dabigatran was ingested.
Dabigatran is a direct thrombin inhibitor with a relatively short half-life. Knowing the time of the last dose is critical to estimate the amount of circulating drug and the level of anticoagulation. This information directly impacts the urgency and necessity of using a specific reversal agent. Baseline renal function is important for dosing but time of last dose is paramount in an acute bleed.
- What is the primary pharmacodynamic rationale for overlapping heparin and warfarin therapy for at least five days?
Answer: Warfarin initially decreases Protein C and S, causing a transient hypercoagulable state.
Warfarin inhibits vitamin K-dependent synthesis of clotting factors II, VII, IX, and X, but it also inhibits the natural anticoagulants Protein C and S. Because Protein C has a very short half-life, its levels drop quickly, leading to a temporary prothrombotic state before the anticoagulant effect on the clotting factors is fully established. The heparin infusion provides immediate anticoagulation that 'bridges' this period until the INR is therapeutic.
- Which factor most likely contributed to the patient's acute opioid toxicity?
Answer: Increased drug absorption due to the patient's fever.
The absorption of fentanyl from a transdermal patch is temperature-dependent. Increased body temperature (fever) or the application of an external heat source causes vasodilation of cutaneous blood vessels, which significantly increases the rate and amount of fentanyl absorbed into the systemic circulation. This can lead to a rapid and unpredictable overdose, especially in an opioid-naive, elderly patient.
- To start the continuous infusion as ordered, the nurse should set the infusion pump to what rate in mL/hr?
Answer: 16.2 mL/hr
This is a multi-step calculation:
1. Calculate the total units per hour: 18 units/kg/hr * 90 kg = 1620 units/hr.
2. Determine the concentration of the heparin solution: 25,000 units / 250 mL = 100 units/mL.
3. Calculate the infusion rate in mL/hr: (Total units/hr) / (Concentration in units/mL) = 1620 units/hr / 100 units/mL = 16.2 mL/hr.
- Which action is the highest priority for the nurse to take?
Answer: Stop the heparin infusion and notify the healthcare provider.
A platelet count drop of over 50% from baseline after 5-14 days of heparin therapy is highly suspicious for Heparin-Induced Thrombocytopenia (HIT), a life-threatening, prothrombotic condition. The immediate priority is to stop the offending agent (heparin) and notify the provider to switch to an alternative anticoagulant.
