Anaesthesia Management in Elderly Patients with Renal Impairment

Pre-operative Assessment and Planning

Elderly patients with renal impairment require mandatory dose reduction of anaesthetic agents, routine renal function assessment using creatinine clearance calculations, and careful avoidance of nephrotoxic drugs to prevent perioperative morbidity and mortality, as recommended by the American Society of Anesthesiologists 1, 2, 3
The American College of Cardiology recommends calculating creatinine clearance using the Cockcroft-Gault equation rather than relying on serum creatinine alone, as serum creatinine significantly underestimates renal impairment in elderly patients due to decreased muscle mass 4, 5
Renal function declines by approximately 1% per year after age 40, with considerable variation related to nephrotoxic effects of comorbidities and drugs, according to the National Kidney Foundation 2, 3, 5
The European Society of Anaesthesiology recommends that renal function directly affects the pharmacokinetics and pharmacodynamics of anaesthetic drugs and therefore must be assessed routinely before surgery 2, 3

The American Society of Anesthesiologists recommends reducing initial doses of hypnotic agents by 25-50% in elderly patients with renal impairment, as age-related alterations in pharmacokinetic and pharmacodynamic profiles render older patients sensitive to relative overdose 1, 6
The dose required to induce anaesthesia is lower in elderly patients, and the onset time is longer—depth of anaesthesia monitoring is recommended by the American Society of Anesthesiologists 1

The American College of Surgeons recommends monitoring for fluid retention and electrolyte disturbances closely, as elderly patients with renal impairment are prone to volume overload and should have hydration status assessed and optimized before and during therapy 4
Appropriate fluid therapy, combined with positioning and antithrombotic measures, reduces the risk of perioperative thromboembolism in the elderly, according to the European Society of Anaesthesiology 1
The American Society of Anesthesiologists recommends completing an end-of-surgery checklist before the patient leaves the operating theatre, including assessment of core temperature, haemoglobin concentration, and confirmation of age-adjusted and renal function-adjusted medication doses 1

The National Kidney Foundation recommends avoiding nephrotoxic medications that could worsen renal function, particularly NSAIDs, COX-2 inhibitors, and drugs that precipitate delirium, as they can increase the risk of acute kidney injury 1, 7, 4
The American Geriatrics Society recommends avoiding co-prescribing multiple nephrotoxic agents that could precipitate acute-on-chronic renal failure 7, 4

The American Pain Society recommends paracetamol as safe and first-line therapy for postoperative pain in elderly patients with renal impairment 7
The American Society of Anesthesiologists recommends using NSAIDs with caution at lowest doses and shortest duration, with proton pump inhibitor gastric protection and routine monitoring for gastric and renal damage 7
The American Society of Anesthesiologists recommends administering morphine cautiously, particularly to patients with poor renal function, with consideration for co-administration of laxatives and anti-emetics as required 7