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Induction and Assessment of Ischemia-reperfusion Injury in Langendorff-perfused Rat Hearts
Published on: July 27, 2015
Novel methods to evaluate controlled reperfusion techniques in cardiac surgery
J L Skinner1, S B Digerness, R D Spruell
1Department of Surgery, School of Medicine, University of Alabama at Birmingham 35294-0007, USA.
International Journal of Surgical Investigation
|May 9, 2001
Summary
Novel techniques using atomic absorption spectroscopy and reperfusion arrhythmia analysis effectively measured metabolic and electrophysiologic changes during cardiac surgery reperfusion. These methods aid in comparing heart reperfusion strategies.
Area of Science:
- Cardiovascular Physiology
- Cardiac Surgery
- Biomedical Engineering
Background:
- Cardiac operations require effective heart reperfusion strategies.
- Assessing reperfusion efficacy is crucial for patient outcomes.
- Novel methods are needed to compare different reperfusion techniques.
Purpose of the Study:
- To describe and validate two novel techniques for evaluating heart reperfusion during cardiac surgery.
- To measure intra-myocyte ion content and analyze reperfusion arrhythmias.
- To compare controlled reperfusion methods.
Main Methods:
- Atomic absorption spectroscopy was used to measure intra-myocyte ion content (sodium, magnesium) in porcine hearts before and after ischemia (cardioplegic arrest).
- A cobalt-EDTA complex served as an extracellular marker.
- Ventricular fibrillation (VF) wavefront morphology and propagation were analyzed using computer algorithms, assessing organization (multiplicity index) and electrical activity (nwaves/s, mp d V/dt).
Main Results:
- Intra-cellular sodium increased, and magnesium decreased significantly (p < 0.05) post-reperfusion.
- Electrophysiologic recovery showed increasingly rapid depolarization and a higher number of wavefronts per second during the first minute of reperfusion.
- These changes indicate successful measurement of metabolic and electrophysiologic events.
Conclusions:
- Atomic absorption spectroscopy and computer-based analysis of reperfusion ventricular fibrillation are effective in quantifying metabolic and electrophysiologic changes.
- These validated methods can be utilized to compare the efficacy of different controlled reperfusion techniques in cardiac surgery.
- The study provides tools for optimizing heart preservation strategies during operations.
