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Renal function and hemodynamics during prolonged isoflurane-induced hypotension in humans
1Département d'anesthésie, Hôpital de l'Enfant-Jésus, Université Laval, Québec, Canada.
Anesthesiology
|May 1, 1991
Summary
Isoflurane-induced hypotension did not significantly impair kidney function in human subjects. Renal blood flow and glomerular filtration were maintained, with quick recovery post-anesthesia.
Area of Science:
- Anesthesiology
- Nephrology
- Physiology
Background:
- Anesthesia can affect renal hemodynamics and function.
- Understanding the impact of induced hypotension on kidney function is crucial for patient safety.
Purpose of the Study:
- To investigate the effects of isoflurane-induced hypotension on glomerular filtration rate (GFR) and effective renal plasma flow (ERPF) in human subjects.
- To assess the preservation of renal compensatory mechanisms during induced hypotension.
Main Methods:
- Twenty human subjects underwent anesthesia maintained with fentanyl, nitrous oxide, oxygen, and isoflurane.
- Hypotension was induced by increasing isoflurane concentration to a mean arterial pressure of approximately 60 mmHg.
- GFR and ERPF were measured using inulin and para-aminohippurate (PAH) clearance, respectively.
Main Results:
- Glomerular filtration rate (GFR) and effective renal plasma flow (ERPF) decreased upon anesthesia induction but did not significantly worsen during hypotension.
- Renal vascular resistance increased during anesthesia but decreased during hypotension, maintaining renal blood flow.
- Postoperatively, ERPF normalized, and GFR exceeded preoperative values.
Conclusions:
- Renal compensatory mechanisms are preserved during isoflurane-induced hypotension.
- Kidney function and hemodynamics rapidly recover to normal levels upon resumption of normotension.