fetal tissue sampling for diagnosis of genetic disorders chorionic villous sampling
DESCRIPTION
FETAL TISSUE SAMPLING FOR DIAGNOSIS OF GENETIC DISORDERS CHORIONIC VILLOUS SAMPLING “A PERSONAL APPROACH” DR. RAJU SAHETYA M.D. ; D.G.O. ; D.F.P. ; F.C.P.S., F.I.C.O.G. OBSTETRICIAN & GYNAECOLOGIST PUSHPA MATERNITY HOME BOMBAY - INDIA. CHORIONIC VILLUS SAMPLING IN PRENATAL DIAGNOSIS - PowerPoint PPT PresentationTRANSCRIPT
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FETAL TISSUE SAMPLING FORDIAGNOSIS OF GENETIC DISORDERS
CHORIONIC VILLOUS SAMPLING“A PERSONAL APPROACH”
DR. RAJU SAHETYAM.D. ; D.G.O. ; D.F.P. ; F.C.P.S., F.I.C.O.G.
OBSTETRICIAN & GYNAECOLOGISTPUSHPA MATERNITY HOME
BOMBAY - INDIA
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CHORIONIC VILLUS SAMPLING IN PRENATAL DIAGNOSIS
SAFETY & UTILIZATION DIFFICULTIES NCOUNTERED
DR. RAJU SAHETYAM.D. ; D.G.O. ; D.F.P. ; F.C.P.S., F.I.C.O.G.
OBSTETRICIAN & GYNAECOLOGISTPUSHPA MATERNITY HOME
BOMBAY - INDIA
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Historical perspective in prenatal diagnosis
Modern era in 1952 by Bevus – technique of amniocentesis
Liley in 1961 – severity of erythroblastosis bilirubin level
IN 1966 – fetal cells from amniotic fluid cultured & karyotyped
In 1966 Hahnemann fetal chorionic villi T.V. by hysteroscope
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Historical Perspective in prenatal diagnosis (cont)
In 1970, Chinese workers blind aspiration of chorionic villi for fetal sex
In 1982, Kazy et al., - role of ultrasonography in successful CVS
In 1985, Brambati et al., rapid uncultured villi – Trisomy 21 at 11 week
Milan group able to minimize maternal cell contamination
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Diagnostic techniques for the 1st trimester
Pre-implantation embryo biopsy
Fetal cells isolated from maternal blood
Coelocentesis
Chorionic villous sampling
Ultrasonography
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Diagnostic techniques in the 2nd trimester
Late chorionic villous sampling
Amniocentesis
Maternal biochemical analysis
Ultrasonography
Fetal blood sampling
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IntroductionChorionic Villus Sampling
Well established in prenatal diagnosis
Villi have same genetic constitution
Reflects chromosomal , biochemical & DNA
CVS as alternative to amniocentesis
Safe, reliable, widespread application
Multicentric study – sampling success 98%
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Indications for CVS in our multicentric study A. Increased risk for Chromosome anomalies 1.Advanced maternal age > 35 years 2.Previous aneuploid offspring 3.Parental balanced structural rearrangement a. Reciprocal translocation b. Robertsonian translocation c. Inversions 4.Maternal Abnormal serum screening 5.Ultrasound diagnosis of anomalies a. Major malformations b. Minor anomalies B. Previous offspring with NTDC. Parents carriers of Mendelian traits D. X-Linked Recessive Didorders
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Utilization of CVSUtilization of CVS
Rapid Karyotyping – when fetal blood sampling unavailable
Excellent source of fetal DNA – for prenatal diagnosis
Cloning of genes & to develop DNA probesEnzyme expression – to identify inborn errors of
metabolism
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PATIENT EVALUATION
GENETIC COUNSELLING
INDICATION FOR REFERAL REVIEWED
ALTERNATIVE PROCEDURES DISCUSSED
RISKS, COMPLICATIONS AND ADVANTAGES
TESTING VERSUS NO TESTING
INFORMED WRITTEN CONSENT
CLINICAL EVALUATION
OBSTETRIC HISTORY
GENITAL INFECTIONS
BLEEDING IN CURRENT PREGNANCY
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PATIENT EVALUATION
ULTRASOUND EVALUATION
FETAL VIABILITY
GESTATIONAL AGE
CHORION FRONDOSUM
SUB-CHORIONIC BLEEDING
UTERO-CERVICAL RELATION
MULTIPLE GESTATION
PROCEDURE ORIENTATION
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PROCEDURE RELATEDPROCEDURE RELATEDANATOMY & EMBRYOLOGYANATOMY & EMBRYOLOGY
GESTATION SAC DOES NOT FILL THE UTERUS
CHORIONIC MEMBRANE SURROUNDS AMNIOTIC CAVITY
EXTAEMBRYONIC COELOM CHORION LAEVE &
CHORION FRONDOSUM VILLI FLOAT AND LOOSELY
ANCHORED FRONDOSUM VILLI
MITOTICALLY ACTIVE
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TECHNIQUES OF CHORIONIC VILLUS SAMPLING 9 TO 11 WKS
TRANSCERVICAL -CHORIONIC VILLUS SAMPLING T.C. - CVS 80 % IN OUR SERIES
TRANSABDOMINAL - CHORIONIC VILLUS SAMPLINGT.A. -
THE SELECTION OF THE ROUTE OF VCS AT THE DISCRETION OF THE OPERATOR AND DEPENDS ON :
LOCATION OF CHORION FRONDOSUM
POSITION OF UTERUS AND BLADDER
PRESENCE OF UTERINE OR CERVICAL ABNORMALITIES
PATIENTS CO-OPERATION
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DEVICES USED IN C V S PERSONAL EXPERIENCE
T.C. - CVS STAINLESS STEEL RIGID / MALLEABLE
OLIVE TIP, GAUGE 16, LENGTH 20 TO 22 cms 10CC DISPOSABLE SYRINGE
T.A. - CVS LONG SPINAL NEEDLE,GAUGE 20/18,
LENGTH 10 TO 16 cms 10CC SYRINGE / MECHANICAL SUCTION
WITH COLLECTING BOTTLE
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DEVICES USED IN CVS PERSONAL EXPERIENCE COMMON TO BOTHTRANSPORT CULTURE BOTTLE, PETRIDISH, LAB SUITABLE MEDIUM, VERTICAL TORCH /DISSECTING MICROSCOPE, PICK UP FORCE
CANNULAECONOMICAL, REUSABLE, EASY AUTOCLAVABLE, CLEANSED WITH SODIUM HYPO CHLORIDEMALLEABLE TO ALL SHAPES, OLIVE TIP ENABLES GOOD IMAGING
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TECHNIQUE TRANSCERVICAL CHRONIC VILLUS SAMPLING
ULTRASOUND EVALUTION
ASEPTIC PRECAUTIONS
PREFORMED CANNULA
ULTRASOUND GUIDANCE
NEGATIVE SUCTION
“TO & FRO” MOVEMENTS
OBSTETRICAN-SONOLOGISTCO-ORDINATION
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Technique – Transabdominal Chorionic Villus Sampling
Ultrasound evaluation Aseptic precautions Ultrasound guided free
hand technique “Back & Forth”
movements Lower fetal loss by 0.5% Reduced incidence of
immediate bleeding
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CHORIONIC VILLUS SAMPLINGCHORIONIC VILLUS SAMPLINGIN TWIN PREGNANCYIN TWIN PREGNANCY
SPECIFIC COUNCELING SEPARATE SETS OF
DEVICES DIFFERENT ROUTES LIMIT ASPIRATION SITES DIANOSTIC ERRORS SELECTIVE TERMINATION VANISHING TWIN
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ASSESMENT OF VILLI QUALITY
DISTINCTIVE FROND LIKE APPEARANCE
BUD-LIKE PROJECTIONS
BLOOD VESSELS COURSING ALONG THE SURFACE
QUANTITY - 15 TO 20 mgs. WET, WEIGHT
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CVS - SAFETY
MATERNAL
REFERRAL INDICATION REVIEWED.
PATIENT EVALUATION
PREVIOUS PREGNANCY WASTAGE.
BLEEDING IN PRESENT PREGNANCY
INFECTIONS INVESTIGATE & TREAT
Rh SENSITIZATION--INCREASED RISK
RISE IN ALPHA-FETO PROTIENS
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CVS - SAFETY
FETUS
• GESTATIONAL AGE CO- RELATION WITH USG.
• TO RULE OUT DISCREPANCY
• MULTIPLE GESTATION - RISKS INCREASES
• SERIAL SCANS--BEFORE & AFTER PROCEDURE
• MINIMISE VASCULAR INSULT
• FOLLOW UP MID-TRIMESTER SCAN & ALPHA-FETO PROTIENS
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DIFFICULTIES ENCOUNTEREDDIFFICULTIES ENCOUNTEREDDUE TO CERVICAL FACTORSDUE TO CERVICAL FACTORSDECREASED CANNULA
MANEUVERABILITYLONG CX, PIN POINT STENOSED BLEEDING AND INFECTIONS
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DIFFICULTIES ENCOUNTEREDDIFFICULTIES ENCOUNTEREDDUE TO UTERINE FACTORSDUE TO UTERINE FACTORS
POSITIONSDEVIATIONCONTRACTIONSSCARS & GROWTHS
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DIFFICULTIES ENCOUNTERED DIFFICULTIES ENCOUNTERED DUE TO CHORIONIC DUE TO CHORIONIC
FRONDOSUMFRONDOSUMLOCATIONLOW LYINGTHICKNESSSUB CHORIONIC BLEEDING HEMATOMA
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DIFFICULTIES ENCOUNTEREDDIFFICULTIES ENCOUNTEREDDUE TO MATERNAL BLADDERDUE TO MATERNAL BLADDER
FULL BLADDERACCESS TO CX, HIGH REACH
CHORION, MOBILITY OF UTERUS, DISCOMFORT.
INSUFFICIENT BLADDERPOOR IMAGING & GUIDANCE,
CERVICO-UTERINE ANGLE
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DIFFICULTIES ENCOUNTEREDPERSONAL EXPERIENCE -10 YRS.IN T.A. - CVS
DISCOMFORT MYOMAS POSTERIOR LOCATION BOWELS INTERVENING MECHANICAL SUCTION OBESITY PREVIOUS SCARS
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PREGNANCY OUTCOME IN 5200 CASES
NORMAL LIVE BIRTHS 4800
NEONATAL DEATHS 11
SPONTANEOUS ABORTIONS 63
PREMATURE DELIVERIES 22
STILL BIRTHS 13
IUFD 3
ABNORMAL KARYOTYPE 132
DEVELOPMENTAL DEFECTS 13
LOST TO FOLLOW UP 143
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PREGNANCY OUTCOME IN 5200 CASES
DEVELOPMENTAL DEFECTS REPORTED
LIMB DEFECTS 3
ENENCEPHALY 2
OLIGOHYDRAMINIOS 6
HYDROCEPHALUS 2
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RISK WITH CHORIONIC VILLUS SAMPLING
FETAL LOSS
INTRAUTERINE INFECTIONS
PERFORATION OF AMNIOTIC SAC
MID-TRIMESTER OLIGOHYDRAMNIOS
FETAL GROWTH AND DEVELOPMENT
MATERNAL CELL CONTAMINATION
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RISK WITH CHORIONIC VILLUS SAMPLINGCVS & LIMB ABNORMALITY
CVS PRIOR TO 8.6 WEEKS GESTATION
VASCULAR INSULT
INCOMPLETE MORPHOGENESIS
DISRUPTS NORMAL EMBRYO
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PATIENT’S ACCEPTANCE
SHORTER WAITING
PRIVACY
COMFORT
ADEQUATE COUNSELLING
WELL INFORMED PROCEDURE
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CONCLUSION - I
CHORIONIC VILLUS SAMPLING HAVE PROVED TO BE REASONABLY SAFE AND RELIABLE TECHNIQUE WITH WIDESPREAD APPLICATIONS AND A HIGH DEGREEE OF ACCEPTANCE AMONG WOMEN UNDERGOING PROCEDURE
FETAL LOSS RISK HAS BEEN DEMONTRATED AS LOW ASAMNIOCENTESIS
NO ADVERSE EFFECTS WERE FOUND ON FETAL GROWTH AND DEVELOPMENET IF CVS PERFORMED BETWEEN 9 & 11 WEEKS GESTATIONS
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CONCLUSION - II
SELECTION BETWEEN T.C.-CVS / T.A.-CVS IS AT THE THE DISCRETION OF THE OPERATOR AND DEPENDS ON
LOCATION OF CHORION, POSITION OF UTERUS, PATIENTS CO-OPERATION.
OBSTETRICIAN - SONOLOGIST CO-ORDINATION IS OF UTMOST IMPORTANCE FOR GOOD SAMPLING
WITH ADVANCES IN DAN TECHNOLOGY, ACURATE,SAME DAY RESULTS, FOR PRENATAL DIAGNOSISBY CVS WITHOUT THE NEED FOR CULTURE IS POSSIBLE
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