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題 名 | In Vitro Assessment of the Flow Fields in a Three-Dimensional Pulmonary Artery Model with Varying Degrees of Valvular Stenosis=體外實驗探討肺動脈瓣膜狹窄病變引起的血液流場變化情形 |
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作 者 | 徐粹烈; 許志豪; 許哲誠; 宋信文; | 書刊名 | 中國工程學刊 |
卷 期 | 21:5 1998.09[民87.09] |
頁 次 | 頁575-584 |
分類號 | 415.384 |
關鍵詞 | 肺動脈瓣膜狹窄; 3-D彩色都卜勒超音波掃瞄; 血液流場; 壓力恢復; Valvular pulmonic stenosis; Three-dimensional echocardiography; Flow fields; Pressure recovery; |
語 文 | 英文(English) |
中文摘要 | 本研究以體外實驗的方式,探討了不同狹窄程度瓣膜病變,對肺動脈內血液流場 的影響。 實驗模型為豬的肺動脈,而其主肺動脈與左肺動脈也依臨床的病例將其擴張變形 。 流場觀測則以 3-D 彩色都卜勒超音波掃瞄來進行,另外通過狹窄瓣膜的壓降,也分別以 心導管及連續式超音波都卜勒來量測比較。實驗的結果顯示了,不同狹窄程度瓣膜下游的流 場,會產生不同程度的噴流與流體分離區,且噴流有偏向主動脈擴張處的趨勢,而噴流的強 度也會隨著瓣膜狹窄程度的增加而增強。因此,瓣膜下游流場變化的情形,應可適度的反應 肺動脈狹窄病變的程度。以連續式都卜勒超音波及心導管兩種不同方法,進行壓降量測的結 果,有很好的正相關性。在狹窄瓣膜下游,沿著噴流走向,有壓力恢復的現象發生,且通過 瓣膜的壓降,隨著瓣膜狹窄程度的增加而增加。當瓣膜狹窄程度愈嚴重時,且通過瓣膜的流 體能量損失也愈高。本實驗的結果,顯示了以體外實驗方式探討血液流場時,其實驗模型的 3-D 幾何形狀相當的重要。 |
英文摘要 | This study was conducted to assess the effects of varying degrees of valvular stenosis on the flow fields in a three-dimensional pulmonary artery model. Porcine pulmonary arteries procured from a slaughterhouse were used as test models. To produce dilated main (MPA) and left (LPA) pulmonary arteries similar to those clinically observed in valvular pulmonic stenosis, an epoxy fixation technique was employed. A three-dimensional echocardiographic reconstruction method for color Doppler flow mapping was used to examine the flow fields in the test models. Additionally, transvalvular pressure drops were measured by a side-hole catheter and predicted by a Doppler-derived Bernoulli equation. Changes in flow fields in the MPA were observed as the pulmonic valve became stenotic. A jet-like flow was present distal to the stenotic valve. The change in geometry in the MPA, due to its dilatation, had a marked effect on the pulmonary artery hemodynamics. The jet-like flow seen distal to the valve deflected away from the centerline and impinged on the roof of the MPA. The force impinging on the stenotic valve and the roof of the MPA increased with increasing degree of valvular stenosis. Clinically, this may impair the stenotic valve and make the dilatation of the MPA more profound. The Dop-pler-predicted pressure drops correlated well with the catheter-mea-sured pressure drops. The measured transvalvular pressure drops increased with increasing degree of valvular stenosis. As a result of increasing pressure drop, the transvalvular energy loss increased as the valve became more stenotic. Some degree of pressure recovery, reflected by a decrease in transvalvular pressure drop with increasing distance from the valve, was observed for each stenotic valve. The |
本系統中英文摘要資訊取自各篇刊載內容。