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Related Experiment Video

Updated: Jun 29, 2026

Quantifying Acute Changes in Renal Sympathetic Nerve Activity in Response to Central Nervous System Manipulations in Anesthetized Rats

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The effect of anaesthesia on renal function

H Burchardi¹, G Kaczmarczyk

¹Zentrum Anaesthesiologie, Rettungs- und Intenivmedizin, Klinikum der Universität, Göttingen, Germany.

European Journal of Anaesthesiology

|May 1, 1994

Summary

Anesthesia and surgical stress can impact kidney function and fluid balance, primarily through indirect effects on hemodynamics and hormonal regulation. While generally transient, these effects highlight the importance of understanding anesthetic impacts on renal physiology.

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Area of Science:

Nephrology
Anesthesiology
Physiology

Background:

Anesthesia and surgical stress significantly influence renal function and body fluid regulation.
Indirect effects via hemodynamics, sympathetic activity, and humoral regulation are more prominent than direct anesthetic effects.

Purpose of the Study:

To elucidate the multifaceted effects of anesthesia and surgical stress on renal function and fluid balance.
To differentiate between direct and indirect impacts of anesthetic agents and procedures on the kidneys.

Main Methods:

Review of existing literature on the physiological effects of various anesthetic agents and mechanical ventilation on renal parameters.
Analysis of peri-operative changes in glomerular filtration rate, urine output, and sodium excretion.

Main Results:

Inhalational anesthetics, opioids, barbiturates, and benzodiazepines generally reduce glomerular filtration rate and urine output, with effects attenuated by hydration.
Regional anesthesia's impact is less pronounced than general anesthesia and linked to hemodynamic changes.
Mechanical ventilation decreases urine volume and sodium excretion, influenced by intrathoracic pressure and hormonal systems.

Conclusions:

Peri-operative alterations in renal function due to anesthesia and surgical stress are typically transient and clinically insignificant.
Direct effects of anesthetics on renal autoregulation, ADH response, and tubular transport are dose- and agent-dependent.
Methoxyflurane is the only anesthetic with a proven direct toxic effect (fluoride-related).