During surgery, additional monitoring beyond standard anesthesia requirements may be necessary. Patients with poorly controlled blood pressure or undergoing major surgery may benefit from arterial line placement for continuous blood pressure monitoring. Central venous access may be required due to the poor condition of peripheral veins and to facilitate the administration of vasoactive medications or assess fluid status. Care must be taken to avoid using the arm with the AVF for intravenous access or blood pressure measurement.
Monitoring urine output is an essential aspect of intraoperative management in CKD patients, as it provides a direct measure of renal perfusion and function. In patients with severely impaired renal function or on dialysis, urine output may be limited, and the focus should shift to maintaining hemodynamic stability and preventing further renal injury.
Gastroparesis is common in patients with CKD due to autonomic dysfunction, necessitating rapid sequence induction in some cases to minimize the risk of aspiration. Neuromuscular blocking agents should be carefully selected, favoring those with minimal renal elimination. Atracurium and cisatracurium are preferred for muscle relaxation, as they undergo Hofmann degradation, which is independent of renal function.
Inhalational Anesthetics
Inhalational agents are generally considered safe in chronic kidney disease, though some agents, such as sevoflurane, have been scrutinized for their potential nephrotoxicity. Sevoflurane can produce compounds like compound A when exposed to soda lime absorbents, which have been shown to be nephrotoxic in animal models. However, clinical concentrations of compound A are not sufficient to cause kidney injury, making sevoflurane an acceptable choice in CKD patients. Desflurane and isoflurane are metabolized to a lesser extent and pose no significant risk of nephrotoxicity.
Neuromuscular Blocking Agents
The choice of neuromuscular blocking agents in chronic kidney disease should account for the drug's metabolism and elimination pathways. Atracurium and cisatracurium are preferred because their breakdown is independent of renal function. Vecuronium, rocuronium, and pancuronium should be used cautiously or avoided due to their reliance on renal excretion, which prolongs their duration of action. Suxamethonium should be avoided due to the risk of exacerbating hyperkalemia, a common complication in CKD patients. Sugammadex can be used to reverse the effects of aminosteroid neuromuscular blockers, but the sugammadex-rocuronium complex may persist in patients with CKD, necessitating careful consideration.
Opioid Analgesics
Opioids are frequently used for pain management in chronic kidney disease patients, but their metabolism and excretion must be considered. Morphine’s active metabolite, morphine-6-glucuronide, accumulates in renal failure, leading to prolonged sedation and respiratory depression, necessitating dose reductions. Fentanyl and remifentanil are safer choices, as their clearance is less affected by renal function. Oxycodone, tramadol, and codeine should be used cautiously due to their prolonged elimination in CKD. Non-opioid analgesics like nonsteroidal anti-inflammatory drugs (NSAIDs) are contraindicated in CKD due to their nephrotoxic effects and potential to exacerbate hyperkalemia and coagulopathy.
| Agent or class | Use in CKD | Reason |
|---|---|---|
| Atracurium, cisatracurium | Preferred | Hofmann degradation, independent of renal function |
| Vecuronium, rocuronium, pancuronium | Use cautiously or avoid | Rely on renal excretion, which prolongs duration of action |
| Suxamethonium | Avoid | Risk of exacerbating hyperkalemia |
| Sugammadex | Consider carefully | The sugammadex–rocuronium complex may persist in CKD |
| Morphine | Reduce dose | Morphine-6-glucuronide accumulates → prolonged sedation and respiratory depression |
| Fentanyl, remifentanil | Safer choices | Clearance is less affected by renal function |
| Oxycodone, tramadol, codeine | Use cautiously | Prolonged elimination in CKD |
| NSAIDs | Contraindicated | Nephrotoxic, and may worsen hyperkalemia and coagulopathy |
| Sevoflurane, isoflurane, desflurane | Acceptable | Clinical compound A concentrations are insufficient to injure the kidney; isoflurane and desflurane are metabolized to a lesser extent |
Regional Anesthesia
Regional anesthesia is a valuable option for Chronic kidney disease patients, as it minimizes the use of systemic drugs that can accumulate. However, caution must be exercised when using neuraxial techniques, as the resulting hypotension can compromise renal perfusion. Vasopressors should be available to maintain blood pressure and avoid worsening renal function. Coagulopathies associated with CKD should also be considered, as they may pose contraindications to spinal or epidural anesthesia.
