Mwoyo wemuchetura unotanga kupera muvhiki yechishanu yekuzvitakura, uye nevhiki yechitanhatu iyo inhengo yakakwana, ine maviri ventricles uye maviri atria. Nenzira yekubata moyo, kufara kwomwana kunotongwa mumatangiro ekutanga ekusimudzirwa, uye muhafu yepiri yekubata moyo wehutano (HR) inoratidza mamiriro ehutusi.
Fetal heart rate ndiyo inowanzo
Mumaawa matatu ekutanga, kuwandisa kwepfungwa dzomukati mumucheche kunogara kuchichinja. Izvi zvinokonzerwa nekuti mumavhiki ekutanga ekuzvitakura chimiro chinokosha chiri kungoumbwa chete, uye chikamu chehurongwa hwemitsipa hunokonzerwa nebasa raro hachina kukwanisa. Nokudaro, pamasvondo matanhatu kusvika ku8, chirwere chepfungwa chemucheche chinokwana 110-130 kurova paminiti, pamasvondo makumi mapfumbamwe nemakumi maviri nemakumi maviri nemakumi mana ekuberekwa kwemoyo mukati mevana pane 170-190 kurohwa paminiti. Kubva pavhiki yegumi nemana kubva pamuviri kusvikira pakuberekwa chaiyo, hutano hwemwoyo hwemucheche huri 140-160 kurohwa paminiti.
Kusiyanisa mubasa romwoyo
Zvinosuruvarisa, kusagadzikana mubasa remwoyo muduku kunogona kuitika kare mumatambo ekutanga ekudzivirira: kana kushaya mwoyo kusina kunyorwa pamusana wemamu 8 mm, izvi zvinogona kuva chiratidzo chekuzvitakura kwakanyanya. Mukadzi anokurudzirwa kuti awane ruzivo rwechipiri rwe ultrasound muvhiki, mushure maro iye anoonekwa.
Kukanganisa kunowanzobva pamwoyo yepamusoro (kuwedzerwa mumoyo wepamusoro kusvika ku 200 kurova paminiti kana kuderera kusvika ku 85-100 kurohwa paminiti) kakawanda zvinoratidza kuti mwana haana kufara. Rapid palpitation ye fetus (tachycardia) inogona kuonekwa mumatambudziko anotevera:
- fetal hypoxia yemwero munyoro (kana mukadzi ane pamuviri ari kure muimba yakazara);
- chiito chemuviri checheche kana amai;
- kuwedzera muzwi rwechibereko;
- kushungurudzika mupfungwa kwemazuva anouya amai.
Mwoyo usina simba uye usina simba wemucheche (bradycardia) unotaura nezve:
- yakanyanya intrauterine hypoxia;
- kuvapo kwe fetoplacental kusakwana;
- mvura shoma kana polyhydramnios;
- kutaurirana kwechifuva che fetus.
Chirwere chepfungwa chemucheche chinoratidza kuvepo kwekukanganisa kwepfungwa dzemwoyo kana intrauterine hypoxia yemwana.
Ko fetal heart rate yakatarwa sei?
Pane nzira dzakasiyana siyana dzekutarisa uye kuongorora basa remwoyo we fetus: auscultation (kuteerera kuteerera moyo we fetus nemubatsiro we stwhoscope midwifery), ultrasound, cardiotocography (CTG), uye echocardiography (ECG).
Mumazamu okutanga ekudzivirira, mubvunzo "Mubvunzo wei pamusana pekuberekwa?" Ichatsigira ultrasound: kushandisa shanje inonzi transvaginal, zvipembenene zvemoyo zvinogona kuonekwa mushure memavhiki mashanu kusvika matanhatu. Kuita (transabdominal) ultrasound registers moyo inoshanda kubva mavhiki anenge 6-7. Sarudzai fetal heartbeat mumavhiki akasiyana-siyana ekudzivirira pa ultrasound uye pane zvidzidzo zvitatu zvekuongorora. Muzuva nezuva tsika yekugadzirisa zvipembenene-gynecologists vanoshandisa stethoscope, kuteerera nekubatsira kwake basa remwoyo kuburikidza nemadziro emimba. Kubviswa kwemashoko emwoyo kunokwanisika kubva mu20 vhiki yekutakura, uye dzimwe nguva - kubvira pa18 vhiki.
Pachine vhiki makumi matatu nemaviri, chirwere chemwoyo che fetal chakaongororwa neCCTG. Iyi nzira inokubvumira kunyora basa re fetal heart, kupesana kwechibereko uye chiitiko chemoto chemwana. Nguva dzose CTG inobvumirwa kana amai vane ramangwana vane chirwere chakakomba che gestosis, zvirwere zvisingaperi kana zvinotapukira, uyewo kana zvipembenene zvisingabviri zvinowanikwa, fetal hypotrophy, mvura shoma kana polyhydramnios. Panguva yekuberekwa, CTG inoitwa munyaya yekubata pamuviri kana kunonoka, nekushaya simba kwebasa kana rhodostimulation.
Fetal ECG inowanikwa pamasvondo 18-28 uye pane zvinotevera:
- nguva yeamai iri vanopfuura makumi matatu nemasere;
- kuberekwa kwakakwana kwevana vane chirwere chemwoyo chepenital;
- kubatana kwepfungwa mukati meamai vari mberi;
- fetal hypotrophy;
- kuonekwa kwekusagadzikana mubasa remwoyo, zvimwe zvirwere uye maitiro ezvisizvo mu ultrasound ye fetus;
- chirwere cheshuga chinokonzera vakadzi;
- zvirwere zvinotapukira panguva yekuzvitakura.
Muchidzidzo ichi, mwoyo wemukomana chete unoongororwa, basa rayo rinoongororwa, pamwe neropa riri mumasangano akasiyana-siyana (kushandisa Doppler hurumende).