Pregnancy after renal transplantation

Perinatal outcomes of renal transplant pregnancies: a 22-year experience at a single tertiary referral center

Background: Renal transplantation not only prolongs survival but also improves quality of life and fertility, particularly in patients with end-stage renal disease. The aim of this study was to evaluate the renal and perinatal outcomes of pregnancy after renal transplantation at a high volume academic tertiary hospital.Methods: Fifty-one renal transplant patients (RTPs) who experienced pregnancy after transplantation and received care at Ege University Hospital between January 1995 and December 2017 were retrospectively identified. Data on demographics, comorbidities, and clinical perinatal outcomes were analyzed.Results: The median age of expectant mothers with renal transplantation was 30.51 ± 5.28 years (range 23-41). The mean interval between discontinuing birth control methods and the last menstrual period was 22 months. Preeclampsia occurred in six pregnancies (11.5%), and 43 of 52 pregnancies resulted in live births (82.6%). The mean gestational age at birth was 36.35 ± 2.36 weeks (range: 26-38). A total of 15 births were preterm deliveries (28.8%). Intrauterine growth retardation (IUGR) was detected in four cases. The mean birth weight was 2664.58 ± 613.99 g (range: 600-3.800 g). Twelve newborns were hospitalized in the neonatal intensive care unit (23%). A significant inverse correlation between birth weight and preconception serum creatinine level was found (p < .001; r = -0.532). An inverse correlation between the interval between transplantation and pregnancy and low postpartum serum creatinine level was established significantly (p < .05; r = -0.331). In addition, an inverse correlation between preconceptional serum creatinine and postpartum serum creatinine in the first year was found statistically significant (p < .001, r = -0.681).Conclusion: Even though pregnancy does not seem to adversely affect renal graft function, risks of perinatal as well as obstetrical complications should not be ignored. Pregnancies in RTPs should be followed closely by a multidisciplinary team of experts to minimize perinatal complications before and during pregnancy.

Pregnancy after renal transplantation: a review of registry and single-center practices and outcomes

Registries from North America, Australia and Europe are rich sources of clinical data on pregnancy after kidney transplantation. Single-center reports of pregnancy outcomes are limited by small sample sizes but not by the potential reporting bias that can impact registry data. Despite the differences in data pools, the obstetric and graft outcomes reported by single centers and registries have been similar. The majority of pregnancies are successful in renal transplant patients, but the risk of complications like pre-eclampsia, low birth weight and premature birth is high. Pregnancy has no significant impact on graft function or survival when baseline function is normal.

Pregnancy outcomes in kidney transplant recipients: a systematic review and meta-analysis

Approximately 50,000 women of reproductive age in the United States are currently living after kidney transplantation (KT), and another 2800 undergo KT each year. Although KT improves reproductive function in women with ESRD, studies of post-KT pregnancies are limited to a few voluntary registry analyses and numerous single-center reports. To obtain more generalizable inferences, we performed a systematic review and meta-analysis of articles published between 2000 and 2010 that reported pregnancy-related outcomes among KT recipients. Of 1343 unique studies, 50 met inclusion criteria, representing 4706 pregnancies in 3570 KT recipients. The overall post-KT live birth rate of 73.5% (95%CI 72.1-74.9) was higher than the general US population (66.7%); similarly, the overall post-KT miscarriage rate of 14.0% (95%CI 12.9-15.1) was lower (17.1%). However, complications of preeclampsia (27.0%, 95%CI 25.2-28.9), gestational diabetes (8.0%, 95%CI 6.7-9.4), Cesarean section (56.9%, 95%CI 54.9-58.9) and preterm delivery (45.6%, 95%CI 43.7-47.5) were higher than the general US population (3.8%, 3.9%, 31.9% and 12.5%, respectively). Pregnancy outcomes were more favorable in studies with lower mean maternal ages; obstetrical complications were higher in studies with shorter mean interval between KT and pregnancy. Although post-KT pregnancy is feasible, complications are relatively high and should be considered in patient counseling and clinical decision making.

Pregnancy and renal transplantation

Ovarian dysfunction, anovulatory vaginal bleeding, amenorrhea, high prolactin levels, and loss of libido are the causes of infertility in women with chronic renal failure. After renal transplantation, endocrine function generally improves after recovery of renal function. In this study we retrospectively evaluated the prepregnancy and postdelivery renal function, outcome of gestation, as well as maternal and fetal complications for eight pregnancies in eight renal transplant recipients between November 1975 and March 2003 of 1095 among 1425. Eight planned pregnancies occurred at a mean of 3.6 years posttransplant. Spontaneous abortion occured in the first trimester in one case. One intrauterine growth retardation was observed with a full-term pregnancy; one intrauterine growth retardation and preterm delivery; one preeclampsia with preterm delivery and urinary tract infection; and one preeclampsia with preterm delivery and oligohydramnios. The mean gestation period was 35.5 +/- 3.0 weeks (31.2 to 38.0). Pregnancy had no negative impact on renal function during a 2-year follow-up. No significant proteinuria or acute rejection episodes were observed. Among the seven deliveries, no congenital anomaly was documented and no postpartum problems for the child and the mother were observed. Our study suggests that successful pregnancy is possible in renal transplant recipients. In cases with good graft function and absence of severe proteinuria or hypertension, pregnancy does not affect graft function or patient survival; however, fetal problems are encountered such as intrauterine growth retardation, low birth weight, and preeclampsia.

Menstrual characteristics and pregnancy in women after renal transplantation

OBJECTIVES

To evaluate menstrual characteristics and pregnancy complications after renal transplantation in women of childbearing age.

METHODS

A 10-year retrospective case-control study was carried out in Esfahan Teaching Hospitals, Esfahan, Iran. The case group consisted of 50 female kidney transplant recipients of childbearing age and the control group of 100 women who were matched for age (+/-2 years) and parity with the study group. Menstrual characteristics and pregnancy data were collected by questionnaire and analyzed by chi(2) and t-tests.

RESULTS

Menstrual characteristics were improved in the 50 women who had renal transplantation, 18 of them conceived, and 20 pregnancies were evaluated. The mean interval between transplantation and pregnancy was 35.5 months and the birth weight of 44% of the newborns was less than 2500 g. Pregnancy complications included hypertension (65%), premature labor (35%) and decreased GFR (15%) during pregnancy, with a mean gestational age at delivery of 34.8 weeks. The women who conceived during the first 2 years after renal transplantation had more maternal and neonatal complications.

CONCLUSIONS

Pregnancy is possible and can be successful and safe after renal transplantation in recipients with normal kidney function. However, maternal and neonatal complications are common and occur more often in patients who conceive within 2 years of transplantation. Post-transplantation pregnancies are high risk and they should be managed in a tertiary center.