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Reliability of the microdialysis pump CMA 107 under hyperbaric conditions
Dirk Henze1, Lars Köthe, Alexander Scharf
1Department of Anesthesiology and Intensive Care Medicine, Martin-Luther-University Halle-Wittenberg, Dryanderstr. 4-7, 06108 Halle (Saale), Germany. dirk.henze@medizin.uni-halle.de
Journal of Neuroscience Methods
|June 15, 2007
Summary
Microdialysis pump reliability is affected by hyperbaric conditions. Pumping capacity and recovery accuracy varied significantly under pressures up to 2.4bar, impacting study interpretations.
Area of Science:
- Physiology
- Biomedical Engineering
- Analytical Chemistry
Background:
- Microdialysis is widely used to measure extracellular substances under various conditions.
- The applicability of microdialysis pumps in hyperbaric environments has not been thoroughly investigated.
- Understanding pump performance under pressure is crucial for accurate physiological measurements.
Purpose of the Study:
- To evaluate the reliability of the microdialysis pump (MDP) CMA 107 under hyperbaric conditions.
- To assess the impact of absolute pressures up to 2.4bar on pump performance and analyte recovery.
Main Methods:
- The CMA 107 pump was subjected to hyperbaric conditions (1-2.4bar) in a decompression chamber.
- Perfusion rate, pumping capacity, and absolute recovery of key analytes (glutamate, pyruvate, lactate, glucose, glycerol) were measured.
- Experiments were conducted under both hyperbaric and normobaric conditions for comparison.
Main Results:
- Pumping capacity showed significant deviations under hyperbaric conditions: -36.5% (compression), -10.5% (isopression), +26.3% (decompression) compared to normobaric.
- Absolute recoveries were affected during isopression, with deviations ranging from -6% to +20% compared to normobaric.
- The pump's pumping capacity was 1.7% higher than expected under normobaric conditions.
Conclusions:
- Absolute ambient pressure up to 2.4bar significantly influences the pumping capacity and reliability of absolute recovery for the CMA 107 microdialysis pump.
- Findings necessitate careful consideration when interpreting microdialysis data obtained under hyperbaric conditions.
- Further research may be needed to validate other microdialysis pump models in hyperbaric settings.
