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Isoflurane is a volatile, halogenated ether anesthetic approved by the FDA for the induction and maintenance of general anesthesia. Structurally related to enflurane, isoflurane has been administered clinically since 1979 and is noted for being nonflammable. Due to a strong, pungent odor, isoflurane is not commonly used for inhalational induction. This activity focuses on the clinical application of isoflurane, including indications, methods of administration, and contraindications relevant to anesthetic practice. Key pharmacological properties are reviewed, including mechanism of action, pharmacokinetics, adverse reactions, and clinical toxicology. Emphasis is placed on intraoperative monitoring strategies and potential complications associated with isoflurane use. This activity supports healthcare professionals who administer anesthesia by reinforcing evidence-based practices in volatile anesthetic management. The role of the interprofessional team is addressed to optimize safety and outcomes during anesthesia involving isoflurane. Objectives: Evaluate the mechanism of action of isoflurane. Assess the importance of minimum alveolar concentration when administering isoflurane for anesthesia. Screen patients for contraindications for isoflurane administration. Implement effective collaboration and communication among interprofessional team members to improve outcomes and treatment efficacy for patients who might benefit from isoflurane therapy. Access free multiple choice questions on this topic.

Signs and Symptoms of Overdose Isoflurane is metabolized to trifluoroacetic acid, which increases concern for renal impairment.[27] However, it has been shown that fluoride fluid levels may rise as much as 50 μmol/L without evidence of postoperative renal dysfunction. There has also been increased concern for neurotoxicity, especially in the developing brain. These effects have been seen in animal models, where it has been demonstrated that both intravenous and inhalational anesthesia promote neuronal apoptosis.[28] Animal studies have also found some evidence of learning deficiencies and behavioral changes after undergoing anesthesia with intravenous or inhalational agents. Extrapolating these effects from animals to humans is difficult due to the different biological systems and the higher doses that animal species need to produce the same anesthetic effect in human subjects. This has led to further investigations into the known neuroprotective and neurotoxic effects of volatile anesthetics.[29] Overdosage of isoflurane can result in cardiac and respiratory depression. Hypoxia and hypercarbia may also be noted. Management of Overdose Isoflurane administration should be ceased immediately for patients who are experiencing an overdose. Ensure a patent airway and provide ventilation with oxygen. Continuously monitor cardiovascular function and manage any signs of poor end-organ perfusion as clinically necessary.

Isoflurane should only be administered by qualified health professionals trained to manage a patient under general anesthesia. Communication between the surgeon and the anesthesia provider is essential to time the appropriate emergence of the patient from general anesthesia. This is due to isoflurane's increased blood solubility coefficient, which leads to increased times for both the induction of and emergence from general anesthesia. Nurse anesthetists administer anesthesia and monitor vital signs, while hospital pharmacists ensure the safe preparation, dosing, and management of anesthetic and other medications used during surgery. Internal medicine conducts preoperative evaluations using tools like the Revised Cardiac Risk Index (RCRI).[30] Emergency medicine professionals respond to overdoses by quickly stabilizing the patient. Interprofessional teamwork is a large part of patient safety in the operating room, and good communication will improve operating room efficiency and help increase patient safety.[31]