Summary
Cardiac tolerance to oxygen deprivation changes significandy during ontogenetic development: immature heart appears to be more resistant to ischemic/hypoxic injury as compared with the adult myocardium. The mechanisms of the higher resistance of the developing heart to oxygen deprivation have not yet been satisfactorily clarified. Adaptation to chronic hypoxia results in similarly enhanced cardiac resistance in animals exposed to hypoxia either immediately after birth or in adulthood. Preconditioning failed to improve ischemic tolerance just after birth but it developed during the early postnatal period, thus counteracting the decreasing tolerance to ischemia. It is, however, too early to reach a definitive conclusion on whether (i) the mechanism(s) involved in the protection of the immature heart differ or are identical with those of the adult myocardium and (ii) cardioprotection by adaptation to chronic hypoxia and preconditioning utilize the same or different pathways. Basic knowledge of the mechanisms which increase tolerance of the immature heart to oxygen deprivation may contribute to the design of therapeutic strategies for both pediatric cardiology and cardiac surgery.
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OšťáDal, B., Ošťa’Dalova, I., Škárka, L., Kolář, F. (2002). Protection of the Developing Heart against Oxygen Deprivation. In: Ostadal, B., Nagano, M., Dhalla, N.S. (eds) Cardiac Development. Progress in Experimental Cardiology, vol 4. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-0967-7_17
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