Related Experiment Videos
Glomerular ultrafiltration in normal and preeclamptic pregnancy
Paul Moran1, Peter H Baylis, Marshall D Lindheimer
1Departments of Obstetrics and Gynecology, University of Newcastle upon Tyne, England.
Journal of the American Society of Nephrology : JASN
|February 22, 2003
Summary
Preeclampsia reduces kidney function during pregnancy by impairing glomerular filtration and blood flow. Kidney function, including glomerular filtration rate (GFR) and renal plasma flow (RPF), fully recovers postpartum.
Area of Science:
- Nephrology
- Obstetrics
- Physiology
Background:
- Preeclampsia is a serious pregnancy complication characterized by hypertension.
- Glomerular filtration rate (GFR) and renal plasma flow (RPF) are known to decrease in preeclampsia.
- The precise mechanisms underlying these renal changes in preeclampsia remain incompletely understood.
Purpose of the Study:
- To investigate the determinants of glomerular ultrafiltration in women with preeclampsia compared to healthy controls.
- To assess the reversibility of renal dysfunction postpartum in preeclampsia.
Main Methods:
- Serial measurements of GFR and RPF were taken in late pregnancy and postpartum.
- Analysis of neutral dextran sieving curves (theta(D)) was performed to evaluate glomerular barrier properties.
- Key determinants of glomerular ultrafiltration, including the ultrafiltration coefficient (K(f)), shunt pathway (omega(0)), and pore size distribution (S), were modeled.
Main Results:
- In preeclampsia, reduced GFR and RPF were associated with increased omega(0) and S, indicating a loss of glomerular size-selectivity.
- Despite increased urinary albumin excretion (UAE), dextran sieving suggested a loss of glomerular charge-selectivity in preeclampsia.
- All measured determinants of GFR and modeled parameters were comparable between preeclamptic women and controls postpartum.
Conclusions:
- Preeclamptic glomerular dysfunction involves impaired size- and charge-selectivity of the glomerular barrier.
- These alterations in kidney function are largely reversible postpartum.
- The findings provide strong evidence for the resolution of preeclamptic glomerular dysfunction after pregnancy.