Women received prophylactic antibiotics (cefuroxime, 750 mg,i.v.). Ultrasound examination was carried out to select the fetus for ER that could be accessed without traversing the monochorionic intertwin membrane. A transverse section of the lower fetal abdomen was obtained and colour flow Doppler was used to visualize the internal iliac arteries and intra-abdominal umbilical vein. Local anaesthesia (10 ml 1% lidocaine) was given to the maternal skin, subcutaneous tissues and myometrium. An 18-gauge needle (Cook Ireland Ltd., Limerick, Ireland) was introduced and under continuous ultrasound visualization was guided to the fetal abdomen with the tip being adjacent to the pelvic vessels. A 400-μm laser fibre was then inserted into the needle and advanced to a couple of millimetres beyond the tip of the needle. Laser coagulation was performed using NdYag laser (Dornier MedTech, Wessling, Germany) with 40 W. This resulted, within a few seconds, in hyperechogenicity of tissues in the lower abdomen and cessation of blood flow in the iliac arteries and umbilical vein. Fetal heart activity continued for several minutes. After a period of rest for about 60 min another ultrasound examination was carried out to confirm death of one monochorionic twin and survival of a dichorionic pair. The patient was discharged home and a further appointment was given for an
ultrasound examination within 2 weeks of the procedure.
Women received prophylactic antibiotics (cefuroxime, 750 mg,i.v.). Ultrasound examination was carried out to select the fetus for ER that could be accessed without traversing the monochorionic intertwin membrane. A transverse section of the lower fetal abdomen was obtained and colour flow Doppler was used to visualize the internal iliac arteries and intra-abdominal umbilical vein. Local anaesthesia (10 ml 1% lidocaine) was given to the maternal skin, subcutaneous tissues and myometrium. An 18-gauge needle (Cook Ireland Ltd., Limerick, Ireland) was introduced and under continuous ultrasound visualization was guided to the fetal abdomen with the tip being adjacent to the pelvic vessels. A 400-μm laser fibre was then inserted into the needle and advanced to a couple of millimetres beyond the tip of the needle. Laser coagulation was performed using NdYag laser (Dornier MedTech, Wessling, Germany) with 40 W. This resulted, within a few seconds, in hyperechogenicity of tissues in the lower abdomen and cessation of blood flow in the iliac arteries and umbilical vein. Fetal heart activity continued for several minutes. After a period of rest for about 60 min another ultrasound examination was carried out to confirm death of one monochorionic twin and survival of a dichorionic pair. The patient was discharged home and a further appointment was given for anultrasound examination within 2 weeks of the procedure.
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