Pamasvondo 18-21 mukadzi anyorerwa kuti ave nechipiri chekuongorora kuongorora kwechipiri. Kubva pamasvondo makumi maviri nemasere, kuberekwa kunogona kuvhiringidzika nekuda kwehutano, ndiko kwechipiri kuongororwa kwekuongorora kuti vanachiremba vanofanira kugutsikana nekusavapo kwehutano husina kunaka huri mumwana. Kana zvichidikanwa, munguva ino zvinokwanisika kuongororwa mazano ekuongororai pane zvipatara zvakakodzera -kusimbisa kukanganisa kana kubvisa kuongororwa uye nguva yakatarwa yeiyi masvondo makumi maviri ekuberekwa. Dzimwe nguva zvinogona kuonekwa sekuti 3-D ultrasound panguva ino ichabatsira zviri nani kutsvaga mararamiro akasiyana, asi ultrasound kuongororwa zvose hazvirevi chete pamakona ezvigadzirwa, asiwo pakudzidza kwechiremba.
Norm ye ultrasound pamasvondo makumi maviri ekuberekwa
Mumasvondo makumi maviri nemaviri ekuberekwa, zviyero zvakakura zve ultrasound zvinotevera:
- pavhiki 21, muvhareji uremu hwe fetus i 300 g;
- kureba muviri - kusvika 16 - 18 cm;
- BDP (biparietal size yehenya) - 48.4 - 51.6 mm;
- LTE (ukuru hweparietal yakakura yehenya) - 60 - 64 mm;
- DB (kureba kwehudyu) - 33.1 - 35.3 mm;
- SJ (kureva kureba kwemuviri) - 49.3 - 52.5 mm;
- SDHK (kureva kurema kwebhokisi) - 43.2 - 46.4 mm;
- kuwanda kwepascenta - 25 - 26 mm, kufanana pasina hutachiona hunokwana, chiero chekukura;
- kureba kwekamuri ye amniotic fluid inobva 35 kusvika 70 mm, mvura inofanira kuva yakachena.
Panguva iyi, zvakakosha kutarisa kuvapo kwemakamuri mana emwoyo uye mamiriro evhavha, chengetedza maitiro emidziyo midzi, fetal heart rate panguva iyi - kubva 120 kusvika 160 paminiti, chimiro chemoyo , chimiro chinoshandiswa - kwete pasi pe15 paawa.
Nenguva ino mukadzi anofanira kunzwa manzwiro ekutanga emucheche, asi achiri kushaya simba uye asingakoshi, asi pa ultrasound anoonekwa zvakanaka. Nzvimbo ye fetus mubereki isati yakasimbiswa - panguva yemasikati, inogona kuitika kakawanda sezvaunoda. Migumisiro ye-ultrasound, apo mavhiki makumi maviri nemaviri ekuberekwa akatanga, inofanira kusanganisira zviyero zvehupi hwehupi hwehuropi: mhepo dzemuuropi, cerebellum, tsime guru. Iva nechokwadi chekuyera urefu hwemapfupa ose emwana wemwana, chengetedza chimiro chemaoko nemakumbo. Muchidziro chemucheche, chimiro chechiropa, kuvapo kwemudumbu uye chikwata, maitiro eitsvo nemukumbo zvinowanikwa.
Ultrasound pakuberekwa pavhiki 21-22
Muvhiki imwechete, zviyamuro zvekutanga zve ultrasound zvinenge zvatochinja zvikuru uye dzine zvinotevera:
- BDP (biparietal size yehenya) - 51.6 - 54.2 mm;
- DB (kureba kwehudyu) - 35.3 - 38.3 mm;
- LTE (yakatarisa parietal size yehenya) - 64 - 67 mm;
- SJ (kureva kureba kwemuviri) - 52.5 - 56.4 mm;
- SDHK (kureva kurema kwebhokisi) - 46.4 - 49.4 mm.
Zvose zvekuberekwa kwemamiriro ekuberekwa, izvo zvinofanira kuitwa pakuongorora kwekuongorora, zvichiri kuitika panguva ino. Mavhiki masere ekuberekwa ndeye nguva iyo hutano hwemucheche hunooneka pachena pa ultrasound: musikana kana mukomana. Panguva ino, chero kukanganisa kunobva kuchimiro che ultrasound kunofanira kuongororwa nevadzidzisi vakakodzera nokuda kwekuongororwa kwekuenderana uye kusinganzwisisi nehupenyu hwomukomana hwehutano hwekuvandudza.