Should we stitch-close the fetoscopic percutaneous access? A case-series of laparotomy to trans-amniotic membrane suturing for intrauterine port placement in fetoscopic surgery for twins.

INTRODUCTION: Maternal laparotomy-assisted fetoscopic surgery for in-utero myelomeningocele repair has shown that a trans-amniotic membrane suture during fetoscopic port placement can reduce postsurgical complications. Fetoscopic laser photocoagulation (FLP) for complex twins is typically performed percutaneously without a transmembrane stitch. However, in scenarios without a placental free window, maternal laparotomy may be used for recipient sac access. Here, we present the outcomes of our series of laparotomy-assisted FLP cases, including a trans-amniotic membrane suturing of the fetoscopic port. METHODS: Retrospective series of twin-twin transfusion syndrome (TTTS) or twin anemia-polycythemia (TAPS) cases treated at 2 fetal centers that underwent maternal laparotomy to FLP from 9/2017 to 1/2023. We recorded preoperative and operative characteristics, as well as pregnancy and neonatal outcomes. RESULTS: During the study period, 9 maternal laparotomy to FLP cases were performed. Two were excluded for prior percutaneous FLP in the pregnancy. The remaining seven utilized a maternal laparotomy to trans-amniotic membrane stitch with confirmation of proper suture placement under ultrasound guidance, and all surgeries were performed with a single 10 F Check-Flo® cannula via sharp. Mean gestational age (GA) at surgery was 19.1 weeks (range 16w4d-23w3d), with delivery occurring at a mean GA of 35.0 weeks (range 32w0d-37w1d), resulting in a mean latency of 15.8 weeks, significantly longer than what is reported in the literature and our own data (mean latency for percutaneous FLP 10.2, 95% CI 9.9-10.5). Furthermore, all cases underwent iatrogenic delivery before labor onset, with the only delivery prior to 34 weeks due to concern for post-laser TAPS. CONCLUSION: This case series of laparotomy to FLP with trans-amniotic stitch, demonstrated no cases of spontaneous preterm birth and a longer-than-expected latency from surgery to delivery. Larger studies are warranted to investigate this approach.

Association of amnioinfusion volume at the time of surgery for twin-twin transfusion syndrome and latency to delivery.

OBJECTIVE: To evaluate the impact of amnioinfusion and other peri-operative factors on pregnancy outcomes in the setting of Twin-twin transfusion syndrome (TTTS) treated via fetoscopic laser photocoagulation (FLP). METHODS: Retrospective study of TTTS treated via FLP from 2010 to 2019. Pregnancies were grouped by amnioinfusion volume during FLP (<1 L vs. ≥1 L). The primary outcome was latency from surgery to delivery. An amnioinfusion statistic (AIstat) was created for each surgery based on the volume of fluid infused and removed and the preoperative deepest vertical pocket. Regression analysis was planned to assess the association of AIstat with latency. RESULTS: Patients with amnioinfusion of ≥1 L at the time of FLP had decreased latency from surgery to delivery (61 ± 29.4 vs. 73 ± 28.8 days with amnioinfusion <1 L, p < 0.001) and increased preterm prelabor rupture of membranes (PPROM) <34 weeks (44.7% vs. 33.5%, p = 0.042). Amnioinfusion ≥1 L was associated with an increased risk of delivery <32 weeks (aRR 2.6, 95% CI 1.5-4.5), 30 weeks (aRR 2.4, 95% CI 1.5-3.8), and 28 weeks (aRR 1.9, 95% CI 1.1-2.3). Cox-proportional regression revealed that AIstat was inversely associated with latency (HR 1.1, 95% CI 1.1-1.2). CONCLUSION: Amnioinfusion ≥1 L during FLP was associated with decreased latency after surgery and increased PPROM <34 weeks.

Dialysis in Pregnancy: Role of the Underlying Cause of Renal Failure on Peripartum Outcomes.

OBJECTIVE: Pregnancy on dialysis is rare and few studies in this population exist. Currently, pregnancy outcomes are thought to be related to dialysis intensity. We hypothesize women requiring dialysis due to diabetes or lupus will have worse pregnancy outcomes compared with other indications for dialysis. STUDY DESIGN: All women receiving dialysis during pregnancy from 2012 to 2016 in a single health system were identified. Differences in perinatal outcomes among those with renal failure caused by diabetes or lupus and with other causes were evaluated. RESULTS: Sixteen women were identified, seven with diabetes or lupus causing renal failure; the remaining nine women had hypertension, focal segmental glomerular sclerosis, polycystic kidney disease, congenital hypoplastic kidneys, or neurogenic bladder. The rates of composite maternal morbidity were similar among the two groups. Composite neonatal morbidity was higher in those with renal failure caused by diabetes or lupus compared with other causes (100% vs. 29%, p = 0.028). CONCLUSION: Despite similar dialysis intensity, the composite neonatal morbidity was higher in women with renal failure caused by diabetes or lupus compared with other etiologies. Our findings suggest that pregnancy outcome in women receiving dialysis is dependent on both the intensity of dialysis as well as the etiology of renal failure.

Steroid Hormone Levels in Recipient Amniotic Fluid in Twin-Twin Transfusion Syndrome and Their Association with Preterm Delivery.

OBJECTIVE: Preterm delivery following fetoscopic laser surgery (FLS) of twin-twin transfusion syndrome (TTTS) is associated with severe perinatal morbidity and mortality. The role of steroid hormones in amniotic fluid (AF) after FLS remains unknown. STUDY DESIGN: A prospective cohort study of consecutive case series of FLS for TTTS was performed from April 2012 to February 2017. Cases were divided into early (≤27 weeks) spontaneous preterm delivery (ED) and late delivery (LD; ≥34 weeks) following FLS and compared. AF supernatants were assessed for protein, estradiol, progesterone and cortisol levels (using the ELISA kit), and normalized to total protein levels to adjust for dilution. RESULTS: A total of 294 consecutive cases of FLS for TTTS in monochorionic-diamniotic twins were performed during the study period. AF was available in 44 ED patients and 50 LD patients. On logistic regression, ED was associated with higher normalized progesterone levels (odds ratio [OR]: 1.25; 95% confidence interval [CI]: 1.12-1.41), lower normalized cortisol (OR: 0.78; 95% CI: 0.64-0.96), and higher estradiol levels (OR: 1.3; 95% CI: 1.03-1.63). CONCLUSION: Elevated AF normalized progesterone and estradiol, and lower normalized cortisol levels were associated with ED. This novel finding requires further exploration to establish the molecular mechanism operational in pregnancies complicated by TTTS to potentially prevent early preterm birth after fetal surgery.

Perinatal outcomes of single fetal survivor after fetal intervention for complicated monochorionic twins.

OBJECTIVE: To compare perinatal outcomes between acute single fetal demise following fetoscopic laser photocoagulation to planned selective reduction (SR) in complicated monochorionic twin pregnancies. METHODS: This was a secondary analysis of prospectively collected data in complicated monochorionic twin pregnancies from 2 fetal centers from 2011 to 2016. Group 1 included women undergoing fetoscopic laser photocoagulation for twin-twin transfusion syndrome (TTTS) who experienced a single fetal demise within 24 hours of the procedure. Group 2 consisted of women undergoing planned selective reduction (SR) with TTTS, and Group 3 SR for indications other than TTTS. RESULTS: Survival of the remaining co-twin at birth was highest in Group 1 (n = 77 patients; 95%) compared with that in Group 2 (n = 15; 80%) and Group 3 (n = 32; 78%; P = .047). The preterm premature rupture of membrane rate was higher in Group 1 (47%) compared with that in Group 2 (33%) and Group 3 (7%; P < .001). Group 1 had a lower gestational age at delivery and shorter procedure-to-delivery interval compared with the other 2 groups (P < .01). CONCLUSION: When single fetal demise occurs following fetoscopic laser photocoagulation, the surviving co-twin is more likely to survive to delivery but has higher PPROM rates and a shorter latency period compared with planned selective reduction for TTTS or other indications.