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Updated: Apr 11, 2026
Induction and Assessment of Ischemia-reperfusion Injury in Langendorff-perfused Rat Hearts
Published on: July 27, 2015
Neonatal rat hearts cannot be protected by ischemic postconditioning
J Doul1, Z Charvátová, I Ošťádalová
1Department of Pathophysiology, Second Faculty of Medicine, Charles University in Prague, Prague, Czech Republic. jan.doul@gmail.com.
Insights
Neonatal hearts show no protection from ischemic postconditioning (IPoC) during the first 10 days of life. Studies found IPoC ineffective in preserving heart function or reducing injury in young rat hearts.
Area of Science:
- Cardiovascular Physiology
- Neonatal Cardiology
- Ischemic Preconditioning and Postconditioning
Background:
- Ischemic postconditioning (IPoC) is a cardioprotective strategy studied in adult hearts.
- Limited research exists on IPoC's effects in the developing neonatal myocardium.
Purpose of the Study:
- To investigate the potential cardioprotective effects of ischemic postconditioning (IPoC) in neonatal rat hearts.
- To determine the efficacy of IPoC across different stages of early postnatal development (days 1, 4, 7, and 10).
Main Methods:
- Langendorff-perfused rat hearts isolated at postnatal days 1, 4, 7, and 10.
- Global ischemia (40 or 60 min) followed by reperfusion, with IPoC applied using various ischemia/reperfusion cycles.
- Measurement of developed force (DF) and lactate dehydrogenase (LDH) release to assess cardiac function and injury.
Main Results:
- Neonatal heart tolerance to ischemia decreased significantly by postnatal days 7 and 10.
- Tested IPoC protocols failed to provide significant protection against ischemia-reperfusion injury in neonatal hearts.
- No significant differences in LDH release were observed between postconditioned and control groups across all tested ages.
Conclusions:
- Neonatal hearts within the first 10 days of postnatal life are not protected by ischemic postconditioning.
- The efficacy of IPoC may be age-dependent, with limited or no benefit observed in the early neonatal period.
Abstract:
Although there are abundant data on ischemic postconditioning (IPoC) in the adult myocardium, this phenomenon has not yet been investigated in neonatal hearts. To examine possible protective effects of IPoC, rat hearts isolated on days 1, 4, 7 and 10 of postnatal life were perfused according to Langendorff. Developed force (DF) of contraction was measured by an isometric force transducer. Hearts were exposed to 40 or 60 min of global ischemia followed by reperfusion up to the maximum recovery of DF. IPoC was induced by three cycles of 10, 30 or 60 s periods of global ischemia/reperfusion. To further determine the extent of ischemic injury, lactate dehydrogenase (LDH) release was measured in the coronary effluent. Tolerance to ischemia did not change from day 1 to day 4 but decreased to days 7 and 10. None of the postconditioning protocols tested led to significant protection on the day 10. Prolonging the period of sustained ischemia to 60 min on day 10 did not lead to better protection. The 3x30 s protocol was then evaluated on days 1, 4 and 7 without any significant effects. There were no significant differences in LDH release between postconditioned and control groups. It can be concluded that neonatal hearts cannot be protected by ischemic postconditioning during first 10 days of postnatal life.
