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2-Vessel Occlusion/Hypotension: A Rat Model of Global Brain Ischemia
Published on: June 22, 2013
Global cerebral ischemia due to circulatory arrest: insights into cellular pathophysiology and diagnostic modalities
Santosh K Sanganalmath1, Purva Gopal2, John R Parker3
1Division of Cardiovascular Diseases, Department of Medicine, University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS, 66160, USA. ssanganal@kumc.edu.
Insights
Circulatory arrest (CA) causes brain injury, leading to neuronal death. This review explores CA pathophysiology and predictive methods for neurological outcomes.
Area of Science:
- Neurology
- Cardiology
- Critical Care Medicine
Background:
- Circulatory arrest (CA) affects ~0.55 per 1000 people annually in the US.
- Brain injury is the primary cause of death and disability post-CA.
- Current treatments are limited by an incomplete understanding of CA's complex pathophysiology.
Purpose of the Study:
- To review the pathophysiology of brain injury following CA.
- To summarize cellular changes in the brain after CA.
- To discuss neurofunctional, neuroimaging, and serum biomarkers for predicting neurologic outcomes in CA patients.
Main Methods:
- Literature review of CA pathophysiology.
- Analysis of cellular mechanisms of neuronal death.
- Evaluation of predictive biomarkers and techniques for neurologic outcomes.
Main Results:
- CA induces global cerebral ischemia, leading to delayed neuronal death.
- Cytotoxic cascades and free radical generation contribute to neuronal injury during and after CA.
- Neurofunctional tests, neuroimaging, and serum biomarkers show promise in predicting patient outcomes.
Conclusions:
- A deeper understanding of CA's cellular mechanisms is crucial for developing effective neuroprotective therapies.
- Identifying reliable predictors of neurologic outcome is essential for patient management and treatment strategies.
- This review synthesizes current knowledge on CA brain injury and outcome prediction.
Abstract:
Circulatory arrest (CA) remains a major unresolved public health problem in the United States; the annual incidence of which is ~0.50 to 0.55 per 1000 population. Despite seminal advances in therapeutic approaches over the past several decades, brain injury continues to be the leading cause of morbidity and mortality after CA. In brief, CA typically results in global cerebral ischemia leading to delayed neuronal death in the hippocampal pyramidal cells as well as in the cortical layers. The dynamic changes occurring in neurons after CA are still unclear, and predicting these neurological changes in the brain still remains a difficult issue. It is hypothesized that the "no-flow" period produces a cytotoxic cascade of membrane depolarization, Ca2+ ion influx, glutamate release, acidosis, and resultant activation of lipases, nucleases, and proteases. Furthermore, during reperfusion injury, neuronal death occurs due to the generation of free radicals by interfering with the mitochondrial respiratory chain. The efficacy of many pharmacological agents for CA patients has often been disappointing, reflecting our incomplete understanding of this enigmatic disease. The primary obstacles to the development of a neuroprotective therapy in CA include uncertainties with regard to the precise cause(s) of neuronal dysfunction and what to target. In this review, we summarize our knowledge of the pathophysiology as well as specific cellular changes in brain after CA and revisit the most important neurofunctional, neuroimaging techniques, and serum biomarkers as potent predictors of neurologic outcome in CA patients.
