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Feasibility and Safety of Chorionic Villus Sampling (CVS) for Prenatal Diagnosis of Thalassemia in Bangladesh.

Thalassaemia is one of the commonest inherited disorders in Bangladesh. Since population is rapidly increasing in Bangladesh, therefore birth of large number of new cases is expected every year. Chorionic villus sampling (CVS) is an invasive diagnostic procedure done in early pregnancy to obtain fetal cells for the prenatal diagnosis of chromosomal and genetic disorders like thalassemia. To investigate the feasibility, safety, and outcome of transabdominal Chorionic Villus Sampling (CVS) for prenatal diagnosis of Beta Thalassemia, this retrospective analytical study was carried out on women who had undergone transabdominal CVS for prenatal diagnosis of Beta thalassemia. All CVS are done at Fetal Medicine Centre, Family Foundation, Green Road, Dhaka, Bangladesh from June 2013 to December 2016. A total of 236 couples who were referred for prenatal diagnosis of thalassemia (Beta thalassemia & Hb-E beta thalassemia) were studied. Transabdominal CVS was done under local anesthesia and real-time ultrasound guidance. A 18G/88mm Spinal Needle (B Braun, Germany) was used. Most procedures were done between 11 and 13 weeks (range 11-14 weeks). All CVS were performed with the "2 operators" technique. The samples were sent for prenatal diagnosis by genetic analysis. Results were recorded and analyzed for descriptive statistics. Out of 236, 123 (52.1%) fetuses were diagnosed as trait (Beta trait or HbE trait), 64 (27.1%) as healthy fetuses and 49 (20.7%) as affected fetuses. A total of 236 CVSs were performed as outdoor basis. Most aspirations (95.1%) were easy; however, in 4.8% cases the aspiration was difficult due to a variety of factors. The overall success rate was 100%. Minor complications like placental hematoma and pervaginal (P/V) bleeding occurred in 2% & 1.3% respectively which were subsided by conservative management. The procedure related miscarriage within three weeks not occurred in any cases. Transabdominal CVS under real-time sonography is a useful outdoor procedure for prenatal diagnosis of beta thalassaemia in early pregnancy without significant risk to the mother and the fetus.

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