Carbon monoxide exchanges between the human fetus and mother: a mathematical model

Area of Science:

• Physiology
• Toxicology
• Mathematical Modeling

Background:

• Carbon monoxide (CO) exposure poses risks to both maternal and fetal health.
• Carboxyhemoglobin (HbCO) is a key indicator of CO poisoning.
• Understanding maternal-fetal CO dynamics is crucial for risk assessment and treatment.

Purpose of the Study:

• To develop a mathematical model for maternal and fetal carboxyhemoglobin (HbCO) concentrations.
• To analyze the impact of various factors on CO uptake and elimination in pregnancy.
• To evaluate the effectiveness of oxygen therapy on maternal and fetal HbCO levels.

Main Methods:

• Developed a time-dependent mathematical model for maternal and fetal HbCO.
• Simulated CO exposure scenarios with varying inspired CO concentrations.
• Incorporated physiological parameters like ventilation, diffusion capacities, and cardiac output.
• Analyzed CO washout and oxygen therapy effects.

Main Results:

• Fetal HbCO exhibits a time lag compared to maternal HbCO during CO exposure and washout.
• Fetal HbCO can reach levels higher than maternal HbCO during CO uptake.
• 100% oxygen therapy reduces maternal HbCO effectively but has a less pronounced effect on fetal CO elimination.
• Calculated HbCO changes under fluctuating air pollution scenarios.
• Assessed the impact of elevated HbCO on fetal oxygenation, considering high altitude and exercise.

Conclusions:

• The model provides insights into maternal-fetal CO dynamics and the limitations of oxygen therapy for fetal CO reduction.
• Fetal susceptibility to CO toxicity may be prolonged due to delayed elimination.
• Further research is needed to optimize interventions for pregnant women exposed to carbon monoxide.