Fetal asphyxia due to umbilical cord compression. Metabolic and brain pathologic consequences

Area of Science:

• Perinatal Medicine
• Neuroscience
• Fetal Physiology

Background:

• Severe asphyxia poses significant risks to fetal well-being.
• Understanding the impact of umbilical cord compression is crucial for managing birth complications.

Purpose of the Study:

• To investigate the neurological and physiological consequences of prolonged severe asphyxia in a term primate fetus.
• To correlate specific patterns of brain injury with different types and durations of asphyxia.

Main Methods:

• A term monkey fetus experienced 50 minutes of severe asphyxia initiated immediately after in utero manipulation.
• Monitoring of arterial blood gases (pO2, pH) and hemoglobin-oxygen saturation.
• Postnatal examination of brain tissue after euthanasia.

Main Results:

• Profound drops in pO2 and pH, with hemoglobin-oxygen saturations below 5%.
• Cardiovascular function improved post-reoxygenation, but severe acidosis recovery took over an hour.
• Autopsy revealed distinct brain damage in the cortex, basal ganglia, brainstem, and thalamus, linked to partial and total asphyxia.

Conclusions:

• Umbilical cord compression can induce varied brain damage based on asphyxia severity and duration.
• Recovery from profound systemic acidosis (pH < 6.70) is possible even after an hour of severe asphyxia.