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Hemodynamic changes in pseudopregnancy in chronically instrumented conscious rats
B F Slangen1, I C Out, C M Verkeste
1Department of Obstetrics and Gynecology, University of Limburg, Maastricht, The Netherlands.
The American Journal of Physiology
|February 1, 1997
Summary
The trophoblast is not essential for early pregnancy
Area of Science:
- Physiology
- Reproductive Biology
- Cardiovascular Science
Background:
- Early pregnancy involves significant hemodynamic adaptations.
- The role of the trophoblast in these initial hemodynamic changes is not fully understood.
Purpose of the Study:
- To test the hypothesis that trophoblast presence is not essential for early pregnancy hemodynamic adaptation.
- To investigate systemic hemodynamic changes in pseudopregnant rats.
Main Methods:
- Systemic hemodynamics were measured in conscious pseudopregnant rats.
- Data were compared with virgin and pregnant rat groups.
- Measurements were taken daily from day 4 to day 10, and on days 12, 14, 18, and 20.
Main Results:
- Pseudopregnant rats showed increased cardiac output (CO) due to higher stroke volume.
- Total peripheral resistance decreased, and myocardial performance indicators increased.
- Hematocrit decreased, indicating hemodilution, with parameters returning to baseline by day 20.
Conclusions:
- Systemic hemodynamic changes, including increased CO, enhanced myocardial performance, and hemodilution, occur in pseudopregnancy.
- These changes closely mimic those observed in early normal pregnancy.
- The findings support the hypothesis that trophoblast is not essential for initial hemodynamic adaptation in pregnancy.