TWP yakave rini uye sei?
Ichi chidzidzo chinoitwa panguva yevhiki gumi nembiri. Izvi zvinotsanangurwa nechokwadi chokuti mushure memasvondo gumi nemana mvura yakakwana inowanika inowanikwa zvakananga ne lymphatic system inokura mudumbu rekuberekwa re fetus.
Mushure mekuenzanisa ukuru hwecccygeal-parietal, chiremba anoshandisa transducer ye ultrasound kuti aone hutano hweTV fetal, hunosiyana mukati memavhiki ekudzivirira, uye inofananidza maitiro anowanikwa nefurafura. Panguva imwecheteyo, mvura yakasvibiswa inogadziriswa mufananidzo webhandi yepamusi pane chekuita chechigadzirwa, uye ganda - rakachena.
Mhinduro dzekuyera dzinoenzaniswa sei?
Zvose mitemo yeTV inorongwa kwevhiki, uye inoratidzwa mufurafura chaiye. Saka, semuenzaniso, pamasvondo gumi nemana, kuwanda kwekorori ino nzvimbo hakufaniri kudarika 1-2 mm, uye panguva yevhiki gumi nemaviri - 2.8 mm. Muchiitiko ichi, kuwedzera kwehuwandu hweparamende ino kunoitika zvakananga nekukura kwe fetus.
Kuwedzera kwechiratidzo ichi hakusi nguva dzose kunoratidza kuvapo kwehutano. Saka, maererano nehuwandu, vana gumi pavana gumi, vane TVP vane 2.5-3.5 mm, vanoberekwa vasina zvinetso zveutano. Nokudaro, kuongororwa kwemigumisiro kunofanirwa kuitwa chete nechiremba uyo, kunze kwekuenzanisa maitiro neavo vakagadzirirwa, anofunga nezveunhu humwe hunhu hwemwana anouya. Pasinei nenyaya iyo amai vangamangwana vanoedza kujekesa mhinduro yacho pasina.
Zvisinei, iyo yakakwirira nhamba yeiyo parameter, inowanzoita kuti mwana ave nechirwere chechiromosomal. Somuenzaniso, neTV inokwana 6 mm, inogona kutaurwa nechokwadi kuti mwana akaberekwa semugumisiro wekuzvimba kwakadaro kuchave nokuputsa mumapurogiramu echromosomal. Uye izvi hazvirevi kungoti Down syndrome.
Nokudaro, TWP, iyo inoshandiswa nemavhiki ekudzivirira uye inotsvakurudzwa nenzira yefurafura, inoreva kune izvo zviratidzo zvinobvumira kutanga kuongororwa kweprauterine fetal development disorders.