Effects of different preparations of propofol, diazepam, and etomidate on human neutrophils in vitro.

Abstract

BACKGROUND:

Intravenous anaesthetics and sedatives can influence polymorphonuclear cell (PMN) functions. Some of the drugs for sedation and anaesthesia have been alternatively dissolved in lipid solutions containing medium (MCT) and/or long chain (LCT) triglycerides. The in vitro effects of two different diazepam (benzyl-alcohol, LCT/MCT), etomidate (propylene-glycol, LCT/MCT), and propofol (LCT, LCT/MCT) preparations on respiratory burst (RB) and phagocytosis of human PMNs were studied.

METHODS:

Diazepam (2, 20 microg ml(-1)), etomidate (0.5, 5 microg ml(-1)), and propofol (6, 60 microg ml(-1)) were investigated in clinical and 10-fold concentrations with flow cytometric assays. The RB was measured with the fluorescent dye rhodamine after induction with Escherichia coli or formyl-methionyl-leucylphenylalanine (FMLP) following priming with tumour necrosis factor alpha (TNF-alpha). Phagocytosis of PMNs was carried out in whole blood after incubation with fluorescein-labelled E. coli.

RESULTS:

LCT-propofol at 60 microg ml(-1) reduced the percentage of PMNs with RB activity after induction with E. coli (52.8+/-20.4) and TNF-alpha/FMLP (10.8+/-5.1)) as well as the percentage of phagocytosing PMNs (48.9+/-19.5) in contrast to LCT/MCT-propofol, which augmented all parameters (85.4+/-10.1, 50.3+/-12.7, 66.5+/-12.5). Also the higher concentrations of LCT/MCT-diluted etomidate and diazepam increased the percentage of RB positive PMNs compared to the alternative compositions. The percentage of phagocytosing PMNs was less reduced with 20 microg ml(-1) LCT/MCT-diazepam (85.2+/-6.9) than with the same concentration of benzyl-alcohol diluted diazepam (68.8+/-12.2) compared to the control.

CONCLUSION:

The in vitro effects of diazepam, etomidate, and propofol are dependent on the solvent applied. The tested LCT/MCT preparations reduce the inhibitory effects on the bacterial killing capacity of PMNs found after incubation with propyleneglycol, benzyl-alcohol, or LCT preparations, respectively.

• Authors: J Heine, K Jaeger, N Weingaertner, D Scheinichen, G Marx, S Piepenbrock
• Journal: Acta anaesthesiologica Scandinavica (Acta Anaesthesiol Scand) Vol. 45 Issue 2 Pg. 213-20 (Feb 2001) ISSN: 0001-5172 [Print] England
• PMID: 11167168 (Publication Type: Comparative Study, Journal Article)

Chemical References

• Anesthetics, Intravenous
• Triglycerides
• Diazepam
• Propofol
• Etomidate

Topics

• Anesthetics, Intravenous (pharmacology)
• Diazepam (pharmacology)
• Erythrocytes (drug effects)
• Etomidate (pharmacology)
• Flow Cytometry
• Humans
• In Vitro Techniques
• Neutrophils (drug effects)
• Phagocytosis (drug effects)
• Propofol (pharmacology)
• Respiratory Burst (drug effects)
• Triglycerides (pharmacology)