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題 名 | Color Doppler Ultrasound Velocimetry of Internal Carotid Arteries in Normal Pregnancies=利用彩色杜卜勒超音波測量正常孕婦內頸動脈血流波型 |
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作 者 | 洪正修; 吳香達; 潘亞平; 楊明智; 舒麗萍; | 書刊名 | 中華醫學雜誌 |
卷 期 | 61:11 1998.11[民87.11] |
頁 次 | 頁657-666 |
分類號 | 417.143 |
關鍵詞 | 彩色杜卜勒超音波; 內頸動脈; Color doppler ultrasound; Internal carotid artery; |
語 文 | 英文(English) |
中文摘要 | 背景 目前有關孕婦腦部血液循環的報告不多。本研究是在假設懷孕過程中,腦 血管血流阻力隨著妊娠週數增高而遞減的情況下,測量孕婦兩側內頸動脈血流的脈衝阻力指 數值及平均流速值,以期建立正常百分比值,供不正常懷孕時參考。 方法 利用彩色杜卜勒超音波儀測量315位妊娠期20-42週的正常孕婦。內頸動脈血流 流型由量取脈衝阻力指數值(PI)及其平均流速值(MV)測得。並利用Altman氏方法分別建立 其2.5%、5%、50%、95%及97.5%之百分比值。 結果 妊娠期20-42週的正常孕婦,其內頸動脈血流波型之血流脈衝阻力指數值(PI)隨妊娠 齡增加而遞減。[PI =Exp (0.3124-0.0084×妊娠齡),R =0.0404,p=0.0003]。其平均流速 值(MV)也隨妊娠齡增加而遞減[MV =Exp(3.8555-0.0093×妊娠齡),R =0.0382,p=0.0005]。 結論 正常妊娠後半期,孕婦內頸動脈血流波型之脈衝阻力指數值及平均流速值都隨妊 娠齡增加而遞減。此事實表示,於正常妊娠後半期,由於腦內血管擴張因而造成近端內頸動 脈血流阻力指數值及平均流速值隨妊娠週數增加而降低。 |
英文摘要 | Background. There are few reports on maternal cerebral circulation during pregnancy. Using the hypothesis that cerebral blood flow resistance decreases progressively with advancing gestational age (GA) as a consequence of estrogenic effects on the vascular system during pregnancy, we calculated the pulsatility index (PI) and the mean velocity (MV) of the maternal right internal carotid artery (ICA) in order to build fitted reference centiles. Methods. A total of 315 pregnant women with a single fetus were studied at 20-42 weeks' gestation. The patients had uncomplicated singleton pregnancies and were without any known fetal or maternal risk factors. Duplex color ultrasound with a pulsed Doppler scanner (7.5 MHz) was used to determine the PI and MV of the maternal ICA. Results.Among the 315 healthy pregnant women, the PI of maternal ICA decreased progressively with advancing GA, PI =Exp (0.3124-0.0084xGA),(p=0.0003), during the second half of pregnancy. The predicted 50th percentile PI values of the ICA decreased from 1.117 (5 %=0.755, 95 %=1.654) at 24 weeks' gestation to 0.917(5 %=0.659, 95 %=1.448) at 40 weeks' gestation. The MV of the maternal ICA also decreased progressively with advancing GA, MV =Exp (3.8555- 0.0093xGA), (p=0.0005), during the second half of pregnancy. The predicted 50 percentile MV values in the ICA decreased from 37.811 cm/sec(5 %=24.177 cm/sec, 95 %=59.138 cm/sec)at 24 weeks' gestation to 32.591 cm/sec(5 %=20.818 cm/sec, 95 %=51.021cm/sec) at 40 weeks' gestation. Conclusions. Both the PI and MV of the maternal ICA decreased with GA during the second half of normal pregnancy as a result of intracerebral vessel dilatation. |
本系統中英文摘要資訊取自各篇刊載內容。