Inhliziyo yentombazane iqala ukwakha isonto lesine. Kusukela ngesonto lesithupha lokukhulelwa, ukukala kwesilinganiso senhliziyo yesisu kunqunywa ngosizo lwemishini ekhethekile - inzwa ye-ultrasound yangaphakathi. Uma kunqunywa amazinga okukhula nokuthuthukiswa kwengane, izinkomba zezinga lenhliziyo ziphakathi kwezinto eziyinhloko. Noma yiluphi ushintsho lwezinkinga ezinkambisweni zokuthuthukiswa luyathinta izinga lenhliziyo futhi ngaleyo ndlela izinkinga zesignali eziye zavela.
Ukuvama kwesilinganiso senhliziyo yesisu sejwayelekile kuncike esikhathini sokukhulelwa. Ngaphansi kwetafula izinhlinzeko zokuxhumana zika-HR ukuya esikhathini sokukhulelwa zinikezwa.
| Isikhathi sokukhulelwa, amasonto. | Isilinganiso senhliziyo, ud./min. |
|---|---|
| 5 | 80-85 |
| 6th | 102-126 |
| I-7 | 126-149 |
| I-8 | 149-172 |
| 9th | 175 (155-195) |
| 10 | 170 (161-179) |
| 11 | 165 (153-177) |
| I-12 | 162 (150-174) |
| 13th | 159 (147-171) |
| 14-40 | 157 (146-168) |
I-heart rate ye-Fetal ngamasonto
Kusukela ngesonto lesihlanu ukuya kwesishiyagalombili inani lezinhliziyo liyakhula, futhi kusukela ngesonto lesishiyagalolunye, inhliziyo ye-fetal ibetha ngokulinganayo (ukuphambukiswa okungenzeka kuboniswa kubazali). Ngemuva kweviki leshumi nantathu, ngesikhathi sokulawula ukushaya kwenhliziyo kwe-fetus, izinga lokushaya kwenhliziyo ngokuvamile liyi-159 bpm. Kulesi simo, kungenzeka ukuthi ukuphambuka okuphakathi kuka 147-171 bpm kungenzeka.
Uma kukhona ukuphambana nokulinganisa kwenhliziyo evamile, udokotela wenza ucwaningo lokuba khona kwe-intrauterine hypoxia ebusweni. Ukushaya kwenhliziyo okusheshayo kubonisa uhlobo oluthile lwe-oksijeni yindlala, futhi i-bradycardia (i-palpitation eqhutshiwe) ifomu elibi. Uhlobo oluthile lwe- hypoxia lomntwana lungangena ekuhlala isikhathi eside komama ngaphandle kokunyakaza noma ekamelweni elincane. Uhlobo olubi lwe-hypoxia luvela ekungeneni kahle kwe-fetoplacental futhi kudinga ukwelashwa okujulile.
Ukuqapha kwenhliziyo yesisu
Umsebenzi we-cardiac we-fetus uhlolwe usebenzisa i-ultrasound, i-echocardiography (ECG), i-auscultation (ukulalela) ne-CTG (i-cardiotocography). Ezimweni eziningi, kusetshenziselwa i-ultrasound kuphela, kepha uma kunezinsolo ze-pathologies, kwenziwa izifundo ezengeziwe. Isibonelo, i-echocardiogram ye-fetus, lapho ukunakwa kugxila kuphela enhliziyweni. Ngosizo lwe-ECG, isakhiwo senhliziyo, imisebenzi yaso, izitsha ezinkulu zihlolwa. Isikhathi esiphezulu kakhulu salolu cwaningo yisikhathi kusukela ngomhla weshumi nesishiyagalombili kuya kwesonto engamashumi amabili nesishiyagalolunye.
Kusukela evikini lemashumi amathathu nesikhombisa, i-CTG ingenziwa, lapho ukushaya kwenhliziyo kwe-fetus ne-contraction ye-uterine kubhalwe ngesikhathi esisodwa.