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[The basis of ischemia-reperfusion and myocardial protection]
S Benhabbouche1, C Crola da Silva, M Abrial
1Lyon University, INSERM UMR 1060 GARMEN, Université Lyon 1, Lyon F-69008, France.
Insights
Myocardial infarction is a leading cause of death. Both ischemia and reperfusion damage heart tissue, but preconditioning and postconditioning can protect the heart muscle.
Area of Science:
- Cardiology
- Cellular Biology
- Pathophysiology
Context:
- Myocardial infarction (MI) is a significant cause of mortality worldwide.
- Understanding the mechanisms of myocardial damage during ischemia and reperfusion is crucial.
- For decades, ischemia was considered the primary harmful stage in MI.
Purpose:
- To review the deleterious effects of myocardial ischemia and reperfusion.
- To highlight the role of reperfusion injury in MI.
- To discuss protective strategies against myocardial damage.
Summary:
- Ischemia leads to energy depletion, ionic imbalance, and metabolic dysfunction.
- Reperfusion also causes significant damage through calcium overload, free radicals, and mitochondrial alterations.
- Preconditioning and postconditioning have emerged as effective methods to protect the ischemic myocardium.
Impact:
- Provides insights into the dual nature of myocardial injury in MI.
- Identifies reperfusion as a critical factor contributing to heart damage.
- Highlights preconditioning and postconditioning as promising therapeutic interventions for MI patients.
Abstract:
The myocardial infarction represents a major cause of mortality. The deleterious phenomena arising during the ischaemia and the reperfusion of the myocardium are studied for more than 40 years. We thought for a long time that the ischaemia was the harmful stage, at the origin of the decrease of the energy stores, the dysregulation of the ionic homeostasis and the metabolic deregulation. We know now that the reperfusion itself is also a source of noxious effects (calcium overload, free radicals production, mitochondrion alteration). To combat these deleterious processes, two maneuvers demonstrated their efficiency by protecting the ischemic myocardium : it is the preconditioning and the postconditionning.
