2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Postoperatively ib tug tshiab Directional Doppler ultrasound kuaj ces pom bilateral li qub (=antegrade) vertebral artery ntshav ntws. Cov txheej txheem uas tsis yog siv tau raug pom tias muaj kev ntseeg siab thiab yuav raug siv los tshuaj xyuas cov neeg mob uas xav tias muaj subclavian steal subclavian steal Tus subclavian steal syndrome (SSS) yog hais txogvascular disorder uas occlusion lossis stenosis ntawm lub subclavian artery proximal to the vertebral artery origin (uas yog cov hlab ntsha subclavian) ua rau hloov pauv vascular haemodynamics uas ua rau retrograde ntshav ntws hauv ipsilateral vertebral artery mus rau … https://www.ncbi.nlm.nih. gov › pmc › articles › PMC2640015
Subclavian steal syndrome: neurotological manifestations
pre-angiographically thiab preoperatively.
Puas antegrade vertebral artery flow normal?
Flow nyob rau hauv sab laug vertebral hlab ntsha (cov xub luv) txawv ntawm ante-grade thiab retrograde. Flow ib txwm antegrade nyob rau hauv txoj cai vertebral artery (ntev xub). B, Sonogram ntawm 60-xyoo-laus tus txiv neej nrog lub plawv dhia thiab ntshav siab nyob rau hauv sab laug caj npab qhia tau hais tias sab laug vertebral hlab ntsha ntws mus rau bidirectional.
Yam vertebral artery flow yog dab tsi?
Qhov ib txwm muaj rau cov hlab ntsha vertebral ntws ntim tau txhais los ntawm 5 mus rau 95 feem pua yog ntawm 102.4 thiab 301.0 mL / min. Qhov kev nthuav dav no yog vim muaj kev sib raug zoo ntawm tus kheejvariability ntawm parameters.
retrograde ntws hauv vertebral artery txhais li cas?
Lub sij hawm subclavian nyiag piav qhia txog cov ntshav ntws rov qab rau hauv cov hlab ntsha vertebral cuam tshuam nrog proximal ipsilateral subclavian artery stenosis lossis occlusion, feem ntau nyob rau hauv qhov chaw ntawm subclavian artery occlusion lossis stenosis ze rau keeb kwm ntawm vertebral artery.
Puas retrograde ntshav ntws tsis zoo?
Nws tau txiav txim siab tias retrograde ntws hauv cov hlab ntsha vertebral yog, ib qho, ib qho chaw zoo. Kev xaiv raug ntawm cov neeg sib tw phais mob tseem tsis meej. Nws yuav xav tau tsis yog kev txheeb xyuas tus kab mob vertebrobasilar nkaus xwb tab sis tseem tsis tau muaj kev ntsuam xyuas kom paub tseeb tias cov tsos mob yog vim cov stenoses.
Pom zoo:
Cov hlab ntsha lymphatic puas muaj li qub?
Feem ntau ntawm cov hlab ntsha lymphatic muaj li qub xws li cov hlab ntshakom cov qog ntshav tuaj yeem txhaws, ntws mus rau ib qho kev taw qhia (mus rau lub plawv). Lymphatic hlab ntsha ntws cov kua dej hu ua lymph los ntawm cov ntaub so ntswg thoob plaws hauv lub cev thiab xa cov kua dej rov qab mus rau hauv cov hlab ntsha los ntawm ob lub ducts.
Puas ntshav ntws los ntawm cov hlab ntsha qeeb?
Tus nqi, lossis nrawm, ntawm cov ntshav ntws sib txawv nrog rau tag nrho cov ntu ntu ntawm cov hlab ntsha. Raws li tag nrho cov ntu ntu ntu ntawm cov hlab ntsha nce, qhov nrawm ntawm kev ntws qis. ntshav ntws qeeb tshaj hauv cov hlab ntsha, uas tso cai rau lub sijhawm pauv cov pa roj thiab cov khoom noj.
Puas yog cov hlab ntsha puas muaj li qub?
Capillaries yog cov hlab ntsha me tshaj plaws hauv lub cev. Cov qauv ntawm capillaries muaj tsuas yog ib txheej ntawm endothelial hlwb. Yog li no, capillaries tsis muaj li qub. Puas capillaries muaj li qub lawm los yog tsis? Capillaries txuas cov hlab ntsha mus rau cov leeg.
Puas yog 3 lub hlab ntsha caj dab zoo li qub?
Txiv kab ntsig yog qhov sib txuas ntawm koj tus menyuam thiab cov placenta. A qaum qaum muaj ob txoj hlab ntsha thiab ib leeg. Qhov no yog hu ua peb lub nkoj qaum. Puas muaj cov hlab ntsha nyob hauv txoj hlab ntaws li qub? qaum muaj peb cov hlab ntsha:
Puas yog cov hlab ntsha loj dua cov hlab ntsha?
Arterioles nqa ntshav thiab oxygen mus rau hauv cov hlab ntsha me tshaj plaws, cov hlab ntsha. Capillaries yog li ntawd small lawv tsuas pom tau nyob hauv lub tshuab tsom. Cov phab ntsa ntawm capillaries yog permeable rau oxygen thiab carbon dioxide.
