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29. Selective Fetal Growth Restriction Type III: Application of a Recent Expert Consensus Definition.

Author

Chmait, Sami R., Monson, Martha A., Korst, Lisa M., Llanes, Arlyn, and Chon, Andrew H.

Subjects
FETAL development, UMBILICAL arteries, TWINS, FETAL growth retardation, DEFINITIONS
Abstract

Objectives: Per a recent expert definition, diagnosis of selective fetal growth restriction (sFGR) in monochorionic diamniotic twins is based on an estimated fetal weight (EFW) <3% as sole criterion and/or combinations of 4 contributory criteria (1 twin EFW <10%; 1 twin abdominal circumference <10%; EFW discordance ≥25%; and smaller twin umbilical artery [UA] pulsatility index >95th percentile). We assessed these criteria in sFGR Type III (intermittent absent or reversed end‐diastolic flow of the UA [iAREDF]) patients to test whether meeting the more stringent parameters of the consensus definition had worse outcomes, that is, progression to sFGR Type II (persistent AREDF) or twin‐twin transfusion syndrome; or secondarily, decreased dual survivorship. Methods: This was a retrospective study of referred sFGR Type III patients (2006–2017). Patients were retrospectively categorized using consensus criteria for 2 comparisons: 1) EFW <3% versus remaining cohort; 2) EFW <3% or met all 4 contributory criteria versus remaining cohort. Results: Forty‐eight patients were studied. Comparison 1: EFW <3% patients (58.3%) were not more likely to demonstrate disease progression (46.4% versus 65.0%, P =.2489) or worse dual survivorship (78.6% versus 85.0%, P =.7161). Comparison 2: EFW <3% or met all 4 contributory criteria (75.0%) patients were not more likely than the others to demonstrate progression (44.4% versus 83.3%, P =.0235) or worse dual survivorship (80.6% versus 83.3%, P = 1.0000). Conclusions: In a referred cohort of sFGR Type III patients, there was no evidence that meeting more stringent parameters of the consensus definition was associated with disease progression or dual survivorship. [ABSTRACT FROM AUTHOR]

Published
2022
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32. 80 Outcomes of percutaneous fetoscopic open spina bifida (OSB) repair

Author

Chmait, Ramen H., primary, Chu, Jason, additional, Kontopoulos, Eftichia V., additional, Van Speybroeck, Alexander, additional, Pham, Huyen Q., additional, Ponrartana, Skorn, additional, Chon, Andrew H., additional, Llanes, Arlyn, additional, Korst, Lisa M., additional, and Quintero, Ruben A., additional

Published
2021
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35. Selective intrauterine growth restriction (SIUGR) type II: proposed subclassification to guide surgical management.

Author

Chmait, Ramen H., Chon, Andrew H., Korst, Lisa M., Stephen, Y., Llanes, Arlyn, and Ouzounian, Joseph G.

Abstract

Optimal surgical management of monochorionic diamniotic twins complicated by selective intrauterine growth restriction (SIUGR) type II is unknown. Surgical management may involve selective laser photocoagulation of communicating vessels (SLPCV), which offers the possibility of dual twin survivors versus umbilical cord occlusion (UCO) of the SIUGR twin. To identify patient characteristics associated with SIUGR twin survival for those undergoing SLPCV. All patients studied were those who underwent fetal treatment for SIUGR type II at our center from 2006–2018. SIUGR type II was defined as an estimated fetal weight <10th percentile with persistent absent and/or reversed end diastolic flow in the umbilical artery of the SIUGR twin, in the absence of twin-twin transfusion syndrome. Patients were offered SLPCV versus UCO, and those undergoing SLPCV, patient characteristics associated with 30-day survival of the SIUGR twin were examined using bivariate analysis and multiple logistic regression models. Fifty-four consecutive SIUGR type II patients were treated, 45 via SLPCV and nine via UCO. Of the 45 SLPCV cases, there were 16 (35.6%) with SIUGR twin (and dual) survival. SIUGR twin survival appeared associated with middle cerebral artery (MCA) peak systolic velocity (psv) <1.5 multiples of the median, and forward atrial systolic flow in the ductus venosus (DV). In a post hoc analysis, we subsequently categorized patients as: SIUGR type IIa (N = 32 (71.1%)): normal MCA psv, and normal DV waveform, versus SIUGR type IIb (N = 13 (28.9%)): MCA psv ≥1.5 multiples of the median, and/or DV with absent or reversed atrial systolic flow. Thirty-day survival of the SIUGR twin was 50% for type IIa and 0% for type IIb. Over one-third of SIUGR type II patients experienced dual survival after treatment with laser surgery. Normal MCA psv and normal DV waveforms were associated with SIUGR type II survival of the SIUGR twin. Post hoc exploration and subclassification of SIUGR type II patients by preoperative Doppler indices created two groups, one (type IIa) with 50% survival and one (type IIb) with 0% survival of the SIUGR twin after laser surgery. Upon further confirmation, these findings may provide guidance for counseling patients and conducting fetal therapy. [ABSTRACT FROM AUTHOR]

Published
2022
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