Video: PI ntawm cov hlab ntsha umbilical yog dab tsi?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Pulsatility index ( PI ) = (systolic velocity - diastolic velocity / mean velocity) Hauv lub cev xeeb tub, qhov tsis kam ua kom ntws (impedance) txo qis hauv umbilical leeg vim muaj coob tus ntawm tertiary qia villi raws li cov placenta matures.
Ib yam li ntawd, siab umbilical artery PI txhais li cas?
Uterine artery PI muab kev ntsuas ntawm uteroplacental perfusion thiab heev PI implies qhov tsis txaus placentation nrog rau nce Kev pheej hmoo ntawm kev tsim preeclampsia, kev txwv kev loj hlob ntawm fetal, abruption thiab stillbirth. Cov uterine artery PI yog suav tias yog nce yog tias nws nyob saum 90 centile.
Ntxiv mus, Pi yog dab tsi hauv ultrasound? PI = (qhov siab tshaj systolic ntws - ncov diastolic ntws) / (txhais tau tias ntws) Tus neeg teb xov tooj feem ntau lees paub thiab teeb tsa qhov siab tshaj (vmax) thiab yam tsawg kawg (vmin) tshaj tawm, thaum lub sij hawm nruab nrab tshaj tawm (vmean) yog xam los ntawm ultrasound tshuab.
Ua raws li qhov no hauv kev xav, PI txhais li cas thaum cev xeeb tub?
Pulsatility index ( PI ) tam sim no yog qhov feem ntau siv qhov ntsuas rau kev ntsuas ntawm UtA Doppler cov qauv kev hloov pauv. Txawm li cas los xij, yav dhau los tshaj tawm cov kev tshawb fawb ntawm UtA Doppler kev tshuaj xyuas thoob plaws cev xeeb tub tau siv ntau yam Doppler cov cim 3, 5, 6, 10, 12, 14, 15, 17, 19-22 lossis cov qhab nia system13, 16, 18.
Dab tsi yog RI thiab PI hauv Doppler?
Cov tsis siv nyob rau hauv kev ntsuam xyuas ntawm uteroplacental ntshav txaus muaj xws li: RI = resistive index. PI = pulsatility index . muaj kev pheej hmoo ntawm diastolic notching.
Pom zoo:
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