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Published on: January 12, 2018
In vitro effect of clinical propofol concentrations on red blood cell aggregation and deformability
Yun Hee Kim1, Hye Gyo Chung, Soohyun A Myung
1Department of Anaesthesiology and Pain Medicine, College of Medicine, Korea University, Seoul, Republic of Korea.
Abstract:
This in vitro study investigated time-related effects of propofol at the plasma concentrations required for sedation and general anaesthesia, on RBC aggregation, deformability, and morphology. Blood containing propofol at plasma concentrations of 0, 2 and 4 μg ml-1 was incubated in a water bath at 37°C for 1, 2, or 4 hours. RBC elongation indices (EIs) and aggregation indices (AIs), which represent RBC deformability and aggregation, respectively, were measured. Also, RBC morphological indices (MIs), which represent RBC morphology, were calculated. EIs and AIs were similar at propofol concentrations of 0, 2, or 4 μg ml-1 after 1, 2, or 4 hours of incubation. MIs at propofol plasma concentrations 0 or 2 μg ml-1 were similar after 1, 2, and 4 hours of incubation, however, MI at a propofol concentration of 4 μg ml-1 after 4 hours of incubation was higher than its value after 1 or 2 hours of incubation. No significant difference was observed between MIs at propofol plasma concentrations 0, 2, or 4 μg ml-1 after 1, 2, and 4 hours of incubation. At clinical doses, propofol has no direct effects on RBC deformability, aggregation, or morphology over a 4 hours incubation period.
Insights
Propofol, a common anesthetic, does not significantly alter red blood cell (RBC) aggregation, deformability, or morphology at clinical doses. This in vitro study found no adverse effects on RBCs over a 4-hour incubation period.
Area of Science:
- Anesthesiology
- Hematology
- Biomedical Engineering
Background:
- Propofol is widely used for sedation and general anesthesia.
- Understanding its effects on blood components like red blood cells (RBCs) is crucial for patient safety.
- Previous research has not fully elucidated the time-dependent impact of propofol on RBC function.
Purpose of the Study:
- To investigate the in vitro time-related effects of propofol on RBC aggregation, deformability, and morphology.
- To assess these effects at clinically relevant plasma concentrations of propofol.
Main Methods:
- Human blood samples were incubated with propofol at concentrations of 0, 2, and 4 μg/mL at 37°C for 1, 2, and 4 hours.
- RBC elongation indices (EIs), aggregation indices (AIs), and morphological indices (MIs) were measured to assess deformability, aggregation, and morphology, respectively.
Main Results:
- RBC elongation indices (deformability) and aggregation indices remained similar across all tested propofol concentrations and incubation times.
- RBC morphological indices showed a slight increase at the highest propofol concentration (4 μg/mL) after 4 hours, but no significant differences were observed overall.
- No significant time-dependent or concentration-dependent adverse effects of propofol on RBCs were detected within the study parameters.
Conclusions:
- Propofol, at concentrations used for sedation and general anesthesia, does not exert direct detrimental effects on red blood cell deformability, aggregation, or morphology.
- The findings suggest that propofol is safe for red blood cells in vitro over a 4-hour period at clinical doses.
- Further in vivo studies may be warranted to confirm these findings in a complex physiological environment.
