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In vitro Assessment of Myocardial Protection following Hypothermia-Preconditioning in a Human Cardiac Myocytes Model
Published on: October 27, 2020
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Hypothermia after Cardiac Arrest in Large Animals (HACA-LA): a randomized controlled experimental study
Olof Persson1,2, Anna Valerianova3,4, Leos Tejkl4
1Department of Clinical Sciences, Anaesthesiology and Intensive Care, Lund University, 22184, Lund, Sweden. olof.persson@med.lu.se.
Intensive Care Medicine Experimental
|October 22, 2025
Summary
Induced hypothermia after cardiac arrest did not show significant neuroprotective effects in large animals. However, immediate cooling did reduce specific brain injury biomarkers, suggesting potential mitigation of neuronal damage.
Area of Science:
- Cardiovascular Research
- Neuroscience
- Critical Care Medicine
Background:
- Induced hypothermia is a neuroprotective strategy post-cardiac arrest in animal models.
- Recent clinical trials cast doubt on hypothermia's benefits.
- Large animal studies on post-cardiac arrest hypothermia are limited.
Purpose of the Study:
- To investigate the neuroprotective effects of immediate versus delayed hypothermia (33°C) after cardiac arrest in large animals.
- To compare hypothermia's efficacy against controlled normothermia.
- To assess histopathological, functional, and biochemical markers of brain injury.
Main Methods:
- Young adult female swine underwent 10 minutes of cardiac arrest followed by resuscitation.
- Animals were randomized to immediate hypothermia, 2-hour delayed hypothermia, or normothermia for 30 hours.
- Primary outcome was brain histopathology (modified Histology Damage Score); secondary outcomes included neurocognitive testing, neurologic deficit scores, and brain injury biomarkers (NfL).
Main Results:
- No significant differences in brain histopathology or neurologic deficit scores were observed between groups.
- Neurocognitive testing also showed no significant group differences.
- Neurofilament light chain (NfL) levels were significantly lower in the immediate hypothermia group compared to normothermia at 48 hours and 7 days.
Conclusions:
- Induced hypothermia initiated immediately or delayed by 2 hours did not provide neuropathological or functional protection in this large animal model of cardiac arrest.
- Lower NfL levels in the immediate hypothermia group suggest a potential mitigation of neuronal injury despite the lack of overall functional improvement.
