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Myocardial function and hemoglobin oxygen affinity during hyperglycemia in the fetal lamb
The Journal of Clinical Investigation
|July 1, 1986
Summary
Maternal hyperglycemia in fetal lambs significantly depresses myocardial function, indicated by altered cardiac hemodynamics and reduced oxygen levels. This study highlights the adverse effects of high blood glucose on fetal cardiac performance.
Area of Science:
- Perinatal Medicine
- Fetal Physiology
- Cardiovascular Research
Background:
- Maternal hyperglycemia is a known risk factor for adverse pregnancy outcomes.
- Understanding its direct impact on fetal development is crucial for clinical management.
Purpose of the Study:
- To investigate the effects of induced maternal hyperglycemia on fetal lamb cardiac function and hemodynamics.
- To assess changes in myocardial performance indicators under hyperglycemic conditions.
Main Methods:
- Chronically catheterized fetal sheep model (n=9) with controlled intravenous glucose infusion.
- Monitoring of fetal blood glucose, PO2, O2 content, O2 saturation, and cardiac parameters (PEP, ET).
- Comparison of data between hyperglycemic and control groups.
Main Results:
- Significant increase in fetal blood glucose levels (14.7 to 54.6 mg/dl).
- Decreased fetal PO2, O2 content, and O2 saturation.
- Prolonged pre-ejection period (PEP) and increased PEP/ET ratio, indicating depressed myocardial function.
- Increased reticulocytes and decreased 2,3-diphosphoglycerate levels.
Conclusions:
- Fetal hyperglycemia significantly depresses myocardial function in lambs.
- Observed cardiac changes are not solely attributable to reduced oxygen saturation.
- This model provides insights into the cardiovascular consequences of maternal diabetes during gestation.
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