Association of Ultrasonographic Parameters With FIGO Clinical Grading System for Placenta Accreta Spectrum

• Conditions: Placenta Accreta, Unspecified Trimester

• Registration Number: NCT04801706
• Lead Sponsor: Assiut University

Brief Summary

To evaluate the association of ultrasonographic parameters suggestive of placenta accreta with intraoperative clinical diagnosis of placenta accreta according to the the clinical grading system for placenta accreta spectrum (PAS) disorders proposed recently by FIGO and histopathological diagnosis of placenta accreta in hysterectomy specimens

Detailed Description

Evaluation of the association of ultrasonographic parameters suggestive of placenta accreta with intraoperative clinical diagnosis of placenta accreta according to the the clinical grading system for placenta accreta spectrum (PAS) disorders proposed recently by FIGO and histopathological diagnosis of placenta accreta in hysterectomy specimens The following ultrasound items will be examined: number and viability of fetuses, amniotic fluid assessment, fetal biometries, fetal gender if possible, fetal presentation, Estimated fetal weight using Hadlock formula, Umbilical Artery Pulsatility Index (UA PI) measured from an automated/manual trace of at least three consecutive waveforms of the relevant vessel in the absence of fetal breathing movements or uterine contractions. The UA PI will be recorded from a free-floating section of cord.

Next step the investigators will look for suggestive ultrasound parameters of placenta accreta including:

1. Location of placenta: Placenta previa anterior / posterior / totally covering the internal cervical os.

2. Lacunae staging according to Finberg and Williams as follows: grade 0, none seen; grade 1, 1-3 present and generally small; grade 2, 4-6 present and tending to be larger and more irregular; grade 3, many throughout the placenta and appearing large and bizarre.

3. Loss of the clear zone, defined as loss or irregularity of the hypoechoic plane in the myometrium underneath the placental bed

4. Bladder wall interruption, defined as loss or interruption of the bright bladder wall (hyperechoic band or 'line' between the uterine serosa and bladder lumen)

5. Uterovescical hypervascularity, defined as a striking amount of color Doppler signal seen between the myometrium and the posterior wall of the bladder, including vessels appearing to extend from the placenta, across the myometrium and beyond the serosa, into the bladder or other organs, often running perpendicular to the myometrium.

6. Increased vascularity in the parametrial region, defined as the presence of hypervascularity extending beyond the lateral uterine walls and involving the region of the parametria .

Study Timeline

• Status Verified: 2021-03
• Study First Submitted: 2021-03-10
• Study First Submitted QC: 2021-03-13
• Last Update Submitted: 2021-03-13
• Study First Posted: 2021-03-17
• Last Update Posted: 2021-03-17
• Study Start: 2021-05
• Primary Completion: 2023-05
• Study Completion: 2023-08

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: Female
• Target Recruitment: 158

Inclusion Criteria

All patients diagnosed with placenta previa previa or low lying placenta during pregnancy at any gestational age will be included and followed up until termination of pregnancy. The diagnosis of placenta previa was based on the presence of placental tissue overing the internal cervical os and Low-lying placenta was diagnosed when the placenta was within 2 cm from the internal cervical os but did not cover it

Exclusion Criteria

• Impaired liver or renal functions.
• Coagulation disorders.
• Associated uterine pathology needing hysterectomy.
• Patient's refusal to participate in clinical research.
• Multiple pregnancy

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
To evaluate the association of ultrasonographic parameters with the intraoperative FIGO clinical grading for diagnosis of placenta accreta spectrum disorder and histopathological diagnosis of placenta accreta in hysterectomy specimens	Bseline	Grade 1 : Complete placental separation at third stage, Grade 2 : removal of placenta required and parts of placenta thought to be abnormally adherent, Grade 3 : Manual removal of placenta required and the whole placental bed thought to be abnormally adherent, Grade 4 : Placental tissue seen to have invaded through the serosa of the uterus but a clear surgical plane can be identified between the bladder and uterus, Grade 5 : Placental tissue seen to have invaded through the serosa of the uterus and a clear surgical plane cannot be identified between the bladder and uterus, Grade 6 : Placental tissue seen to have invaded through the serosa of the uterus and infiltrating the parametrium or any organ other than the urinary bladder

Secondary Outcome Measures

Name	Time	Method
Association of each ultrasonographic parameter of placental invasion with maternal and fetal complications	Baseline	1. Maternal complications both intra and post-operatively including cesarean hysterectomy, ICU admission, bladder injury, bowel injury and death.; 2. Fetal and neonatal complications including Apgar score less than 7 at 5 min, RDS, NICU, preterm and neonatal death.; 3. Development of ultrasound scoring system for prediction of placenta accreta.