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Antepartum to postpartum changes in transcapillary fluid balance
British Journal of Obstetrics and Gynaecology
|September 1, 1990
Summary
Postpartum fluid shifts involve increased colloid osmotic pressure in plasma and interstitial fluid. This suggests fluid mobilization from tissues, likely due to changes in capillary pressure and protein dynamics.
Area of Science:
- Physiology
- Obstetrics
- Fluid Balance
Background:
- Body volume homeostasis undergoes significant changes during the puerperium.
- Understanding transcapillary fluid balance is crucial for postpartum recovery.
Purpose of the Study:
- To examine transcapillary fluid balance in healthy women antepartum and postpartum.
- To measure interstitial colloid osmotic pressure and interstitial hydrostatic pressure.
Main Methods:
- Utilized the 'wick' method for interstitial colloid osmotic pressure.
- Employed the 'wick-in-needle' method for interstitial hydrostatic pressure.
- Measurements taken in subcutaneous tissue on the thorax and ankle.
Main Results:
- Observed a significant increase in plasma colloid osmotic pressure (mean 1.8 mmHg, P=0.027).
- Observed a significant increase in interstitial fluid colloid osmotic pressure at the ankle (mean 2.9 mmHg, P=0.008).
- No significant changes in colloid osmotic pressure gradient, interstitial hydrostatic pressure, hemoglobin, or hematocrit.
Conclusions:
- Increased interstitial colloid osmotic pressure suggests fluid mobilization from interstitium, possibly due to reduced capillary hydrostatic pressure.
- Elevated plasma colloid osmotic pressure likely results from increased albumin synthesis or protein reabsorption.
- These findings elucidate postpartum fluid volume regulation mechanisms.