Perioperative Management of Buspirone for Quadruple CABG Surgery
Continue buspirone through the morning of surgery without interruption. 1
Rationale for Continuation
Buspirone is an anxiolytic agent that does not fall into the categories requiring perioperative discontinuation based on current perioperative guidelines. The 2021 SPAQI consensus statement provides comprehensive guidance on perioperative analgesic management but does not specifically address buspirone or other anxiolytics requiring discontinuation 2. The absence of buspirone from the hold/discontinue recommendations is clinically significant.
Key Safety Considerations
Drug Interactions to Monitor
Avoid combining buspirone with MAOIs perioperatively, as this combination may cause elevated blood pressure and poses a significant hazard 1. If the patient is on an MAOI, buspirone must be discontinued well in advance of surgery.
Serotonin syndrome risk exists when buspirone is combined with other serotonergic agents (SSRIs, SNRIs, triptans) or with drugs impairing serotonin metabolism 1. Monitor for mental status changes, autonomic instability, neuromuscular changes, and gastrointestinal symptoms perioperatively.
CYP3A4 Interactions
Buspirone is metabolized by CYP3A4, creating multiple potential drug interactions 1:
- Strong CYP3A4 inhibitors (diltiazem, verapamil, erythromycin, itraconazole, ketoconazole) can increase buspirone concentrations 3- to 19-fold 1
- CYP3A4 inducers (rifampin, phenytoin, phenobarbital, carbamazepine, dexamethasone) can decrease buspirone concentrations by up to 90% 1
- If the patient is on calcium channel blockers (diltiazem/verapamil) commonly used in cardiac surgery, buspirone levels may be significantly elevated 1
Perioperative Management Algorithm
Preoperative Assessment
- Review all concurrent medications for potential serotonergic agents or CYP3A4 inhibitors/inducers 1
- Confirm no MAOI use (absolute contraindication) 1
- Document baseline anxiety level to guide postoperative management
- Alert anesthesia team to buspirone use and any interacting medications 1
Day of Surgery
- Administer buspirone on the morning of surgery with a sip of water 1
- Inform anesthesiologist about potential interactions with anesthetic agents, particularly if patient is on calcium channel blockers 1
- Monitor for CNS depression when combined with general anesthetics, as buspirone has CNS-active properties 1
Postoperative Period
- Resume buspirone as soon as oral intake is tolerated 1
- Monitor for serotonin syndrome if patient receives multiple serotonergic agents postoperatively 1
- Watch for increased sedation if strong CYP3A4 inhibitors are added postoperatively 1
- Avoid abrupt discontinuation to prevent anxiety rebound
Common Pitfalls to Avoid
Do not discontinue buspirone unnecessarily, as this may precipitate anxiety symptoms during an already stressful perioperative period 1. Unlike barbiturates (which require weaning) or ergotamine (which requires holding), buspirone does not have specific perioperative contraindications 2.
Do not overlook drug-drug interactions, particularly with calcium channel blockers commonly used in cardiac surgery patients, which can increase buspirone levels 3- to 5-fold 1.
Do not confuse buspirone with benzodiazepines or barbiturates, which have different perioperative management requirements 2. Buspirone does not cause the same degree of respiratory depression or withdrawal syndromes.
Secondary Prevention Focus
While managing buspirone, ensure the patient receives appropriate secondary prevention medications post-CABG, including aspirin, statins, beta-blockers, and ACE inhibitors/ARBs as indicated 3, 4, 5, 6. These medications have proven mortality and morbidity benefits in the post-CABG population and should be prioritized over anxiolytic management.