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- Modification of Left Ventricular Isovolumic Relaxation Time during Dobutamine Echocardiography as a Diagnostic Method for Ischemic Heart Disease
- 負荷壓力心臟超音波
- Role of Transthoracic Doppler Echocardiography in Evaluating Coronary Flow Reserve in the Angiographically Normal Left Anterior Descending Coronary Artery
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題 名 | Modification of Left Ventricular Isovolumic Relaxation Time during Dobutamine Echocardiography as a Diagnostic Method for Ischemic Heart Disease=左心室等體積舒長時間在Dobutamine壓力時的變化對於缺氧性心臟病的診斷價值 |
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作 者 | 王兆弘; 程文俊; 洪明銳; | 書刊名 | 長庚醫學 |
卷 期 | 20:3 1997.09[民86.09] |
頁 次 | 頁163-173 |
分類號 | 415.31 |
關鍵詞 | 杜普勒心臟超音波; 壓力心臟超音波; 等體積舒長時間; Dobutamine; Doppler echocardiography; Isovolumic relaxation time; Stress echocardiography; |
語 文 | 英文(English) |
中文摘要 | 背景:本研究將左心室等體積舒張時間修正,並評估此修正模式對dobutamine壓力 心臟超音波診所價值的影響。方法:59 位病人接受 dobutamine 壓力心臟超音波檢查,並依 據冠狀動脈攝影及壓力性鉈 -201 核子掃描, 分成冠心病人組 (34 位 ) 及正常組 (25 位 )。我們特別監測等體積舒張時間的變化,並用一新的方法做修正。結果: 隨著 dobutamine 劑量的增加,等體積舒張時間有逐漸縮短的情形,但在心肌缺氧引發時,卻有異常延長的現 象。dobutamine 壓力超音波心圖診斷冠心病的敏感性及特異性分別為 84% 和 74%,若用修 正後等體積舒張時間延長與否的特性做為心肌缺氧的指標,其診斷的特異性提昇至 94%,卻 沒有減低敏感性 (84%)。另外,修正後等體積舒張時間在心肌缺氧時有延長的病患,其壓力 性鉈 -201 核子掃描顯示有較大的缺氧區域,且其冠狀動脈攝影也發現有較多的阻塞性血管 。結論: 我們認為,利用修正後左心室等體積舒張時間於心肌缺氧時的延長與否,可更改善 dobutamine 壓力心臟超音波的診斷價值,且可提供疾病的嚴重度。 |
英文摘要 | Background: The diagnostic ability of dobutamine stress two-dimensional echocardiog- raphy is limited by the clarity of the echocardiographic image. In this study, left ven- tricular isovolumic relaxation time (IVRT) was modified and the effect of this modifi- cation on the diagnostic accuracy of dobutamine echocardiography (DE) in detecting ischemia was assessed. Methods: DE was performed in 59 subjects (34 and 25 in the control and patient group, respectively). The results were compared with coronary angiography and stress scintigraphy. We focused on the changes of the IVRT, the corrected IVRT which was the IVRT corrected for heart rate, and the modified IVRT which is the corrected IVRT modified by a new-designed equation. Results: These isovolumic relaxation variables shortened with the increment of dobuta- mine dosage and were markedly prolonged when ischemia developed. The sensitivity and specificity ofDE were 84% and 74%. However, using the prolongation of correct- ed IVRT and modified IVRT as indicators of ischemia, the specificity increased (from 74% to 91% and to 94%, respectively), without a significant reduction in sensitivity (from 84% to 76% and to 84%, respectively). Patients with positive results for these variables, as compared with negative results, had a significant result of more ischemic segments and a tendency of more diseased vessels. Conclusion: The prolongation of these isovolumic relaxation variables during myocar- dial ischemia improves the diagnostic accuracy of DE and is also well correlated with the severity of ischemia. |
本系統中英文摘要資訊取自各篇刊載內容。