PCCN Pharmacology & Pain Management — Questions and Answers
Question 1: A patient receiving morphine sulfate IV begins to experience respiratory depression. What is the most appropriate immediate intervention?
- Administer naloxone (Correct answer)
- Place in Trendelenburg position
- Increase IV fluid rate
- Reposition the patient and observe
Correct answer: Administer naloxone
Morphine sulfate is an opioid analgesic, and respiratory depression is a serious adverse effect. Naloxone is an opioid antagonist that rapidly reverses the effects of opioids by competing for receptor sites. Administering naloxone is the immediate and most appropriate intervention to counteract life-threatening respiratory depression.
Question 2: Which of the following medications is classified as a beta-1 selective blocker and commonly used in heart failure management?
- Metoprolol (Correct answer)
- Propranolol
- Carvedilol
- Labetalol
Correct answer: Metoprolol
Metoprolol is a beta-1 selective blocker, meaning it primarily blocks beta-1 adrenergic receptors in the heart, reducing heart rate and myocardial contractility. This action helps to decrease myocardial oxygen demand and is beneficial in managing heart failure. Propranolol, carvedilol, and labetalol are non-selective or have additional alpha-blocking properties.
Question 3: What is the primary concern when administering IV potassium chloride to a patient?
- Nausea and vomiting
- Renal insufficiency
- Hypotension
- Arrhythmias (Correct answer)
Correct answer: Arrhythmias
Administering IV potassium chloride too rapidly or in excessive amounts can lead to hyperkalemia, which significantly affects cardiac electrical activity. This can cause life-threatening arrhythmias, including bradycardia, heart block, and even cardiac arrest. Therefore, it must be administered slowly and carefully, often diluted, with close cardiac monitoring.
Question 4: A patient is prescribed a fentanyl patch for chronic pain. Which of the following instructions is most important?
- Change the patch every 12 hours
- Apply only to the upper chest
- Avoid exposing the patch to heat (Correct answer)
- Apply over broken skin for better absorption
Correct answer: Avoid exposing the patch to heat
Fentanyl patches release medication systemically, and heat (from heating pads, hot baths, or fever) can significantly increase the rate of fentanyl absorption. This accelerated absorption can lead to dangerously high serum fentanyl levels, increasing the risk of severe respiratory depression and overdose. Patients must be educated to avoid heat exposure to the patch.
Question 5: Which drug is commonly used for sedation in mechanically ventilated patients and has both anxiolytic and amnestic effects?
- Dexmedetomidine
- Lorazepam
- Propofol
- Midazolam (Correct answer)
Correct answer: Midazolam
Midazolam is a short-acting benzodiazepine commonly used for sedation in mechanically ventilated patients due to its rapid onset and relatively short duration of action. It provides both anxiolytic (anxiety-reducing) and amnestic (memory-impairing) effects, which are beneficial for patient comfort and tolerance of mechanical ventilation. Other options have different primary uses or side effect profiles.
Question 6: Which medication is used to reverse the anticoagulant effects of warfarin in case of major bleeding?
- Vitamin D
- Protamine sulfate
- Vitamin K (Correct answer)
- Idarucizumab
Correct answer: Vitamin K
Warfarin is an anticoagulant that works by inhibiting vitamin K-dependent clotting factors. Therefore, in cases of major bleeding or significant overdose, administering Vitamin K (phytonadione) can reverse its anticoagulant effects by promoting the synthesis of these clotting factors. Protamine sulfate reverses heparin, and idarucizumab reverses dabigatran.
Question 7: Which of the following pain scales is most appropriate for use with a nonverbal, intubated patient?
- Numeric Rating Scale (NRS)
- Wong-Baker FACES scale
- Behavioral Pain Scale (BPS) (Correct answer)
- Visual Analog Scale (VAS)
Correct answer: Behavioral Pain Scale (BPS)
The Behavioral Pain Scale (BPS) is specifically designed for assessing pain in critically ill, nonverbal, and intubated patients. It evaluates observable behaviors such as facial expression, upper limb movements, and compliance with ventilation, providing an objective measure of pain when self-report is not possible. Other scales require verbal or cognitive ability.
Question 8: A patient receiving IV heparin has an aPTT that is significantly above the therapeutic range. What is the appropriate reversal agent?
- Desmopressin
- Vitamin K
- Protamine sulfate (Correct answer)
- Fresh frozen plasma
Correct answer: Protamine sulfate
Protamine sulfate is the specific antidote for heparin overdose. It works by forming a stable complex with heparin, neutralizing its anticoagulant effects. When a patient's aPTT is significantly elevated above the therapeutic range, indicating excessive anticoagulation, protamine sulfate is administered to reverse the effects and reduce bleeding risk.
Question 9: Which of the following best describes the mechanism of action of ACE inhibitors?
- Inhibits beta-adrenergic receptors
- Blocks calcium channels in myocardial cells
- Inhibits conversion of angiotensin I to angiotensin II (Correct answer)
- Promotes reabsorption of sodium in renal tubules
Correct answer: Inhibits conversion of angiotensin I to angiotensin II
ACE inhibitors (Angiotensin-Converting Enzyme inhibitors) block the enzyme responsible for converting angiotensin I to angiotensin II. Angiotensin II is a potent vasoconstrictor and stimulates aldosterone release, so inhibiting its formation leads to vasodilation, reduced blood pressure, and decreased fluid retention. This mechanism makes them effective in treating hypertension and heart failure.
PCCN Pharmacology & Pain Management
A patient receiving morphine sulfate IV begins to experience respiratory depression.
What is the most appropriate immediate intervention?