Anesthesia — An Overview for the Reconstructive Urologist
The surgeon and anesthesia team should agree on the expected duration, position, blood loss, airway access after docking, analgesia and postoperative destination. This overview covers those decisions and recognition of important complications. Drug dosing and block technique belong in the linked pharmacology and procedural articles.
See also: Analgesia, Nerve Blocks, Nausea & Vomiting, Positioning & Nerve Injury and ERAS.
Anesthetic Techniques and Services
| Term | What it describes | Reconstructive application |
|---|---|---|
| General anesthesia | Drug-induced unconsciousness; airway, ventilation, analgesia and immobility require a coordinated plan | Most prolonged abdominal and robotic reconstruction |
| Regional anesthesia | Neuraxial or peripheral blockade, with or without sedation or general anesthesia | Selected endoscopic/perineal operations or postoperative analgesia |
| Local anesthesia | Infiltration of the operative field | Selected minor procedures; total local-anesthetic exposure must include all injections and blocks |
| Monitored anesthesia care (MAC) | An anesthesia service, not a particular depth of sedation | Selected procedures requiring anesthesia assessment, monitoring, titration and capacity to rescue or convert to general anesthesia |
ASA explicitly distinguishes MAC from moderate sedation. Purposeful response to verbal or light tactile stimulation describes moderate sedation; a patient receiving MAC may move through different depths. Neither the label “MAC” nor initially preserved spontaneous breathing removes the need for airway rescue capability.[1]
General Anesthesia — Induction, Maintenance, Emergence
Induction includes preoxygenation, a plan for loss of airway reflexes and appropriate monitoring. Hypnosis, analgesia and muscle relaxation are separate effects: a hypnotic or neuromuscular blocker does not substitute for analgesia. Maintenance must accommodate pneumoperitoneum, position, blood loss and changing surgical stimulation. Emergence includes recovery of ventilation and muscle strength, analgesic transition and an explicit extubation plan.
Volatile anesthesia and propofol-based total intravenous anesthesia are both reasonable for noncardiac surgery. The 2024 AHA/ACC guideline finds no apparent difference in cardiovascular events between these approaches; this does not establish that they have identical effects on every outcome. The same guideline regards neuraxial or general anesthesia as reasonable when neuraxial anesthesia is feasible.[2]
Propofol-based anesthesia can reduce baseline PONV risk as part of a combined prevention plan; see PONV. A patient susceptible to malignant hyperthermia requires a nontriggering anesthetic and appropriate workstation preparation, not simply a change in the maintenance infusion.[7]
Regional Anesthesia
Spinal anesthesia supplies a finite-duration neuraxial block; an epidural catheter permits continued titration. Either may be unsuitable because of the operation, patient physiology, infection, coagulation status or inability to manage complications. Epidural analgesia is an option for selected major open abdominal operations, rather than a requirement for every major GU reconstruction.[2]
Plan for hypotension, motor weakness, urinary retention and postoperative monitoring. Treat hypotension according to its cause; a large fluid bolus is not an automatic response to every sympathectomy. New neurological deficits after neuraxial anesthesia require prompt assessment rather than attribution to positioning or a slowly resolving block.
Antithrombotic timing applies to both insertion and catheter removal, varies with drug, dose and renal function, and must be coordinated with postoperative prophylaxis. See Antithrombotic Therapy. Peripheral blocks can complement the anesthetic but have procedure- and approach-dependent coverage; no fascial-plane block reliably replaces the full visceral, somatic and systemic analgesic plan.
Airway Management
Anticipated Difficult Airway
The ASA 2022 guideline supports an awake approach when difficult intubation is suspected and there is concern about difficult mask/supraglottic ventilation, aspiration, inability to tolerate brief apnea, or difficult emergency invasive airway access. Patient cooperation, physiology, expertise and available equipment affect the chosen pathway.[3]
Before robotic docking or restrictive positioning, confirm how the anesthesia team can reach the airway and how the robot and drapes will be released in an emergency. A previously easy intubation does not eliminate risk from subsequent edema, tube movement or impaired access.
Unanticipated Difficult Intubation — DAS 2025
The updated adult DAS algorithm prioritizes oxygenation and recommends video laryngoscopy first when possible. It allows at most three attempts plus one by a more experienced colleague; each attempt should change something likely to improve success. This is a ceiling, not a requirement to persist through hypoxemia or trauma.[4]
After failed intubation, a second-generation supraglottic airway is the rescue route, with a maximum of three insertion attempts. If oxygenation is restored, pause and decide whether waking the patient is safest. Failed supraglottic rescue leads to a final optimized mask-ventilation attempt; cannot-intubate/cannot-oxygenate requires emergency front-of-neck access. Prepare for escalation early. Confirm tracheal placement with sustained waveform capnography and visual evidence where possible.[4]
Extubation Is Part of the Airway Plan
Assess readiness, airway swelling, ventilation, neuromuscular recovery and likely difficulty of reintubation. Choose the location, timing and skilled assistance accordingly. Awake versus deep extubation is an individualized anesthesia decision; selected difficult airways may need a staged approach or continued ventilation. Document difficult airway events and inform the patient.[3]
Neuromuscular Blockade and Reversal
Paralysis provides neither unconsciousness nor analgesia. Depth should follow operative need and a feasible recovery plan, rather than a routine request for maximal blockade. The ASA 2023 recommendations emphasize quantitative monitoring at the adductor pollicis and a train-of-four ratio of at least 0.9 before extubation. Clinical strength tests or visual/tactile twitch assessment alone cannot reliably establish recovery.[5]
For rocuronium or vecuronium, sugammadex is preferred over neostigmine at deep, moderate or shallow block. Neostigmine is a reasonable alternative at minimal block, quantitatively defined as a ratio of 0.4 to below 0.9. A patient who has spontaneously recovered to at least 0.9 does not need pharmacological antagonism. These recommendations do not make sugammadex a reversal agent for every neuromuscular blocker.[5]
Persistent weakness, upper-airway obstruction or hypoventilation in recovery warrants immediate assessment and airway support; consider residual blockade alongside opioids, sedation and other causes.
Depth of Anesthesia and Awareness
Processed EEG can supplement clinical assessment and anesthetic-delivery monitoring. BIS studies commonly targeted 40–60, but the index is not a stand-alone guarantee of unconsciousness and is affected by drugs and artifacts. The 2019 Cochrane review found low-certainty evidence of less awareness compared with clinical-sign guidance, but no evidence of a difference compared with end-tidal anesthetic-gas guidance. It does not justify a routine instruction to lighten anesthesia to BIS 55–70 before surgery ends.[6]
Delirium prevention is also not assured by EEG guidance. In ENGAGES, 1,232 older adults were randomized; among 1,213 assessed, delirium occurred in 157/604 (26.0%) with EEG guidance versus 140/609 (23.0%) with usual care, without a significant reduction. This trial does not negate other uses of EEG monitoring.[10]
Malignant Hyperthermia
Suspect MH with an unexplained hypermetabolic picture during or after exposure to triggering volatile anesthetics or succinylcholine; do not wait for marked fever. Succinylcholine-associated masseter rigidity warrants evaluation but is not by itself diagnostic of MH.[7][8]
Stop triggering agents, call for help and the MH cart, and give high-flow 100% oxygen. MHAUS recommends IV dantrolene 2.5 mg/kg rapidly, repeated according to the response. More than 10 mg/kg may be necessary for persistent rigidity or hypermetabolism; lack of response despite large doses should also prompt reconsideration of the diagnosis.
Cool when core temperature exceeds 39°C or is rising rapidly, stopping active cooling below 38°C. Treat hyperkalemia, acidosis and arrhythmias; avoid calcium-channel blockers with dantrolene. Monitor temperature, ventilation, potassium, CK, renal function, urine and coagulation. After stabilization, observation in an appropriate PACU/ICU setting should continue for at least 24 hours.[7]
Use the institution's MH cognitive aid for the full crisis and post-crisis protocol. The surgical team's immediate roles include stopping nonessential surgery, obtaining supplies and helping free airway access.
Perioperative Anaphylaxis
Unexpected severe hypotension or bronchospasm may represent anaphylaxis without visible skin findings. Stop suspected triggers and nonessential surgery, call for help, support oxygenation and ventilation, and give epinephrine with rapid crystalloid resuscitation. In the monitored perioperative setting, trained anesthesia clinicians may use titrated IV epinephrine; this differs from the usual community IM pathway. Follow the dedicated perioperative algorithm.[9]
Antihistamines and corticosteroids must not delay epinephrine or resuscitation. Consider hidden exposures such as chlorhexidine-coated devices and lubricants. After stabilization, obtain timed tryptase samples, document all exposures and arrange specialist allergy investigation rather than permanently labeling every administered drug as the culprit.[9]
The Surgeon's Intraoperative Communication Checklist
- Before incision: expected duration, position, docking and emergency access, blood loss, bowel work, local anesthetic/block plan and postoperative destination.
- During surgery: communicate changing stimulation, bleeding and operative difficulty; request changes in blockade or hemodynamic support with their clinical purpose.
- Before closure: agree on extubation readiness, quantitative neuromuscular recovery, temperature, PONV prevention and analgesic transition.
- At handover: report airway difficulty, reactions, blood loss, blocks and all local-anesthetic doses. Account for baseline opioid treatment and tolerance rather than imposing “rescue opioids only” on every patient.
References
1. American Society of Anesthesiologists. “Statement on Distinguishing Monitored Anesthesia Care from Moderate Sedation Analgesia.” Updated 2023. ASA statement.
2. Thompson A, Fleischmann KE, Smilowitz NR, et al. “2024 AHA/ACC Guideline for Perioperative Cardiovascular Management for Noncardiac Surgery.” J Am Coll Cardiol. 2024;84:1869–1969. doi:10.1016/j.jacc.2024.06.013.
3. Apfelbaum JL, Hagberg CA, Connis RT, et al. “2022 American Society of Anesthesiologists Practice Guidelines for Management of the Difficult Airway.” Anesthesiology. 2022;136:31–81. doi:10.1097/ALN.0000000000004002.
4. Ahmad I, El-Boghdadly K, Iliff H, et al. “Difficult Airway Society 2025 Guidelines for Management of Unanticipated Difficult Tracheal Intubation in Adults.” Br J Anaesth. 2026;136:283–307. doi:10.1016/j.bja.2025.10.006.
5. Thilen SR, Weigel WA, Todd MM, et al. “2023 American Society of Anesthesiologists Practice Guidelines for Monitoring and Antagonism of Neuromuscular Blockade.” Anesthesiology. 2023;138:13–41. doi:10.1097/ALN.0000000000004379.
6. Lewis SR, Pritchard MW, Fawcett LJ, Punjasawadwong Y. “Bispectral Index for Improving Intraoperative Awareness and Early Postoperative Recovery in Adults.” Cochrane Database Syst Rev. 2019;9:CD003843. doi:10.1002/14651858.CD003843.pub4.
7. Malignant Hyperthermia Association of the United States. “Managing a Crisis.” MHAUS acute-treatment guidance.
8. Malignant Hyperthermia Association of the United States. “Masseter Muscle Rigidity: Definition, Relationship to Malignant Hyperthermia, and Management.” 2018. MHAUS recommendation.
9. Resuscitation Council UK. “Emergency Treatment of Peri-operative Anaphylaxis.” 2024. Perioperative algorithm.
10. Wildes TS, Mickle AM, Ben Abdallah A, et al. “Effect of Electroencephalography-Guided Anesthetic Administration on Postoperative Delirium Among Older Adults Undergoing Major Surgery: The ENGAGES Randomized Clinical Trial.” JAMA. 2019;321:473–483. doi:10.1001/jama.2018.22005.