Renal disorders often do not worsen during pregnancy; noninfectious renal disorders are usually exacerbated only when uncontrolled hypertension coexists. However, significant renal insufficiency (serum creatinine > 3 mg/dL [>> 30 mg/dL [>
Maternal renal insufficiency may cause
After kidney transplantation, full-term, uncomplicated pregnancy is often possible if women have all of the following:
A transplanted kidney that has been in place for > 2 years
Normal renal function
No episodes of rejection
Normal blood pressure (BP)
Delivery is usually required before term because preeclampsia, fetal growth restriction, or uteroplacental insufficiency develop. Sometimes amniocentesis to check fetal lung maturity can help determine when delivery should be done; a lecithin/sphingomyelin ratio of > 2:1 or presence of phosphatidylglycerol indicates maturity. Cesarean delivery is very common, although vaginal delivery may be possible if the cervix is ripe and no impediments to vaginal delivery are evident.
End-stage renal disease
Advances in dialysis treatment have increased life expectancy for patients with end-stage renal disease, improved pregnancy outcomes, and increased fertility. The survival rate for fetuses of pregnant women receiving hemodialysis has improved from 23% (in about 1980) to almost 90% currently. The reason is probably the substantial increase in hemodialysis dose used during pregnancy; now, high-flux, high-efficiency hemodialysis is typically done 6 times a week. Dialysis can be adjusted based on laboratory, ultrasonographic, and clinical findings (eg, severe hypertension, nausea or vomiting, edema, excessive weight gain, persistent polyhydramnios).
Although pregnancy outcomes have improved, complication rates for patients with end-stage renal disease remain high.
Key Points
Women who have significant renal insufficiency before pregnancy usually cannot maintain a pregnancy to term.
In pregnant women with renal insufficiency, measure BP and weight every 2 weeks, and measure BUN and creatinine levels plus creatinine clearance often, as indicated by severity and progression of disease.
Consult closely with a nephrologist when treating renal insufficiency in a pregnant woman; delivery is usually required before term.
Advances in dialysis treatment have increased life expectancy for patients with end-stage renal disease, improved pregnancy outcomes, and increased fertility, but complication rates for these patients remain high.
