Anesthesia in the Cardiac Catheterization Laboratory (5-Mark Answer)

• Remote location, often distant from OR support and difficult to access in an emergency
• Fluoroscopy (C-arm) surrounds the patient's head/torso, restricting airway access and anesthesia machine positioning
• Limited space for anesthesia equipment, longer circuit/IV/suction tubing often needed
• Radiation exposure - lead aprons, thyroid shields, portable lead screens, and maximal distance from the source are required for the anesthesia team
• Darkened room and table movement during fluoroscopy without warning
• Table/patient often rotated or moved suddenly by the operator - Miller's Anesthesia, 10e, "The Laboratory Environment."

• Careful review of cardiac comorbidities: coronary artery disease, heart failure, valvular disease, arrhythmias, pulmonary hypertension
• Renal function assessment (risk of contrast-induced nephropathy) and hydration status
• Review of anticoagulant/antiplatelet therapy (heparin, DAPT) - coordination for periprocedural anticoagulation and reversal (protamine)
• NPO status and airway assessment as for any general anesthetic, even if sedation is planned

• Choice ranges from local anesthesia with monitored anesthesia care (MAC)/conscious sedation (most diagnostic caths) to general anesthesia (TAVR, complex EP ablation, pediatric cases, or when a motionless field/airway control is essential)
• Drugs: midazolam/fentanyl or propofol/dexmedetomidine for sedation; balanced GA with controlled ventilation for complex structural or EP procedures
• Standard ASA monitoring plus arterial line (often shared with the sheath) for beat-to-beat pressure monitoring during procedures like TAVR or balloon valvuloplasty where hemodynamic swings are expected

• Sudden hemodynamic instability from contrast reactions, vagal reactions, arrhythmias (induced during EP studies/ablation or catheter manipulation), tamponade (perforation), or rapid pacing during valve deployment
• Contrast media reactions: anaphylactoid response, nephrotoxicity, hypotension
• Vascular access complications: femoral/radial hematoma, retroperitoneal bleed, limb ischemia
• Need for immediate availability of defibrillator, emergency drugs, and cardiac surgical back-up (especially for TAVR/structural interventions)
• Anticoagulation monitoring via ACT during interventional procedures

• MRI-conditional devices and metal instruments require attention if hybrid imaging used
• Pediatric cath cases need attention to contrast volume limits, hypothermia, and shunt physiology
• Radiation protection protocols for pregnant staff/patients
• Close communication with the interventional cardiologist regarding case flow, since the anesthesiologist often functions as a "co-proceduralist" (e.g., providing TEE guidance in structural interventions)