Certified Registered Nurse Anesthetist (CRNA) Practice Exam

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What is the typical dosing range for phenylephrine?

  1. 20-100 mcg/min

  2. 30-150 mcg/min

  3. 40-200 mcg/min

  4. 50-250 mcg/min

The correct answer is: 40-200 mcg/min

The typical dosing range for phenylephrine is significant for its clinical application, particularly in managing hypotension and ensuring adequate perfusion during anesthetic procedures. Phenylephrine is a selective alpha-1 adrenergic agonist that causes vasoconstriction, thereby increasing systemic vascular resistance and blood pressure without significantly affecting heart rate. The dosing range of 40-200 mcg/min falls within the standard therapeutic levels used in clinical settings. This range provides flexibility for dosing adjustments based on the patient's response and the complexity of the surgery. Understanding the correct dosing range is essential for effective management, particularly during anesthesia, where maintaining hemodynamic stability is crucial. Other ranges, while they may appear reasonable, do not align as accurately with the established dosing protocols for phenylephrine. Utilizing the appropriate dosing guidelines ensures optimal control of blood pressure, minimizes the risk of adverse reactions, and maximizes patient safety during perioperative care.