Intrapartum fetal asphyxia: definition, diagnosis, and classification

Area of Science:

• Perinatal Medicine
• Neonatology
• Obstetrics

Background:

• Fetal asphyxia is a significant complication occurring in approximately 2% of deliveries.
• Diagnosing fetal asphyxia relies on evidence of metabolic acidosis, specifically an umbilical artery base deficit greater than 12 mmol/L.
• Current methods for classifying the severity of fetal asphyxia are limited due to unknown exposure duration and fetal response.

Purpose of the Study:

• To propose a novel classification system for the severity of fetal asphyxial exposure.
• To confirm asphyxial exposure using blood gas and acid-base assessments.
• To define severity based on newborn encephalopathy and organ system complications.

Main Methods:

• Confirmation of asphyxial exposure through blood gas and acid-base assessment.
• Identification of significant metabolic acidosis (umbilical artery base deficit > 12 mmol/L).
• Classification of severity based on the presence and extent of newborn encephalopathy and other organ system complications.

Main Results:

• A classification system is proposed that confirms asphyxial exposure via metabolic acidosis.
• Severity is categorized by the development of newborn encephalopathy and organ system dysfunction.
• The classification aims to standardize the assessment of fetal asphyxia severity.

Conclusions:

• The proposed classification provides a framework for assessing fetal asphyxia severity.
• Newborn encephalopathy and organ complications are key indicators for severity grading.
• Further research is needed to refine and validate this classification system for clinical use.