Continuous Telemetric In Utero Tracheal Pressure Measurements in Fetal Lambs

Area of Science:

• Fetal Surgery
• Developmental Biology
• Medical Engineering

Background:

• Normal fetal lung development requires airspace expansion and lung liquid regulation.
• Congenital diaphragmatic hernia (CDH) causes lung hypoplasia due to abdominal organ displacement into the chest.
• Tracheal occlusion can improve lung hypoplasia in CDH fetuses but risks premature birth.

Purpose of the Study:

• To develop and validate a method for continuous measurement of intratracheal and amniotic pressures in a fetal lamb model of CDH.
• To establish a foundation for optimizing tracheal occlusion parameters for in utero CDH treatment.
• To quantify pressure dynamics during tracheal occlusion in CDH fetuses.

Main Methods:

• A surgical model of CDH was created in fetal lambs via hysterotomy.
• A device was implanted to continuously measure intratracheal and amniotic pressures.
• Data were collected, filtered, and transrespiratory pressure was calculated post-delivery.

Main Results:

• A novel method for continuous pressure monitoring in a fetal CDH model was successfully implemented.
• The study enabled the collection of pressure data essential for understanding tracheal occlusion effects.
• Transrespiratory pressure was calculated from the collected data.

Conclusions:

• Accurate pressure measurement is crucial for optimizing in utero tracheal occlusion therapy for CDH.
• This methodology provides a basis for future studies on improving CDH treatment strategies.
• Further research is needed to correlate pressure measurements with lung development outcomes.