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[Fetal hypoxia--etiology and pathophysiology of hypoxic damage]
1Klinika za zenske bolesti i porodnistvo Klinicke bolnice Sestre milosrdnice, Zagreb.
Insights
Preventing fetal hypoxia, a major cause of brain damage, is crucial in perinatology. Prenatal hypoxia, occurring in 80% of cases, triggers complex cellular responses in the fetal brain.
Area of Science:
- Perinatology
- Neuroscience
- Fetal Medicine
Context:
- Fetal hypoxia is a significant concern in perinatology, with prevention of organ damage, especially to the brain, being a priority.
- Hypoxic and ischemic events can originate from maternal, intrauterine, umbilical, placental, or fetal factors.
- Prenatal hypoxic lesions occur in approximately 80% of cases, while perinatal events account for 10-20%.
Purpose:
- To highlight the critical importance of preventing hypoxic damage to the fetal brain.
- To outline the diverse causes of fetal hypoxia.
- To describe the cellular and subcellular responses within the fetal brain following hypoxic-ischemic insults.
Summary:
- Fetal hypoxia stems from various causes and frequently occurs prenatally, initiating complex cellular and subcellular reactions in the brain.
- Membranous responses include potassium channel activation, excitotoxic amino acid release (aspartate, glutamate), NMDA receptor activation, calcium influx, and lipid peroxidation.
- Cytosolic events involve free oxygen radical formation, release of inflammatory mediators (eicosanoids, prostaglandins, leukotrienes, cytokines), enzyme activation, and gene induction.
Impact:
- Understanding these responses is vital for developing targeted neuroprotective strategies against fetal brain injury.
- This knowledge aids in identifying critical pathways involved in hypoxic-ischemic brain damage.
- Informing clinical practice and research for improved fetal and neonatal outcomes.
Abstract:
In current perinatology, the prevention of hypoxic damage to the organs, brain in particular, is given special emphasis. The causes of fetal hypoxia include maternal (preuterine), intrauterine, umbilical, placental and fetal causes. Hypoxia and hypoxic lesions occur prenatally in about 80%, and perinatally in 10-20% of cases. Hypoxia/ischemia induce cellular and subcellular responses in the fetal brain. Some of these are membraneous phenomena such as potassium channel activation, enhanced release of excitoxic amino acids aspartate and glutaminate, activation of NMDA receptors, transmembranous calcium ion influx, and membranous lipid peroxidation. Cytosolic events include the formation of free oxygen radicals, release of eicosanoids, prostaglandins, leukotriens and cytokines, enzyme activation, and gene induction.