International journal of cardiac imaging最新文献_第6页

Kinematic analysis of left ventricular deformation in myocardial infarction using magnetic resonance cardiac tagging. 磁共振心脏标记对心肌梗死左心室变形的运动学分析。

International journal of cardiac imaging Pub Date : 1999-06-01 DOI: 10.1023/a:1006089820107

F W Aelen, T Arts, D G Sanders, G R Thelissen, F W Prinzen, R S Reneman

{"title":"Kinematic analysis of left ventricular deformation in myocardial infarction using magnetic resonance cardiac tagging.","authors":"F W Aelen, T Arts, D G Sanders, G R Thelissen, F W Prinzen, R S Reneman","doi":"10.1023/a:1006089820107","DOIUrl":"https://doi.org/10.1023/a:1006089820107","url":null,"abstract":"The Magnetic Resonance (MR) tagging technique provides detailed information about 2D motion in the plane of observation. Interpretation of this information as a reflection of the 3D motion of the entire cardiac wall is a major problem. In finite element models of the mechanics of the infarcted heart, an infarcted region causes motional asymmetry, extending far beyond the infarct boundary. Here we present a method to quantify such asymmetry in amplitude and orientation. For this purpose images of a short-axis cross-section of the ejecting left ventricle were acquired from 9 healthy volunteers and 5 patients with myocardial infarction. MR-tags were applied in a 5 mm grid at end-diastole. The tags were tracked by video-image analysis. Tag motion was fitted to a kinematic model of cardiac motion. For the volunteers and the patients the center of the cavity displaced by about the same amount (p = 0.11) during the ejection phase: 3.8 +/- 1.4 and 3.0 +/- 0.9 mm (mean +/- sd), respectively. Cross-sectional rotation and the decrease in cross-sectional area of the cavity were both greater in the volunteers than in the patients: 6.4 +/- 1.5 vs. 3.0 +/- 0.8 degrees (p < 0.001), and 945 +/- 71 vs. 700 +/- 176 mm2 (p = 0.02), respectively. In the patients, asymmetry of wall motion, as expressed by a sine wave dependency of contraction around the circumference, was significantly enlarged (p = 0.02). The proposed method of kinematic analysis can be used to assess cardiac deformation in humans. We expect that by analyzing images of more cross-sections simultaneously, the 3D location and the degree of infarction can be assessed efficiently.","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"15 3","pages":"241-51"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006089820107","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21336395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Comparison of dobutamine stress echocardiography and exercise stress Thallium-201 SPECT for detection of myocardial ischemia after acute myocardial infarction treated with thrombolysis. 多巴酚丁胺应激超声心动图与运动应激铊-201 SPECT检测溶栓治疗急性心肌梗死后心肌缺血的比较。

International journal of cardiac imaging Pub Date : 1999-06-01 DOI: 10.1023/a:1006169601499

M Previtali, G Cannizzaro, L Lanzarini, G Calsamiglia, A Poli, R Fetiveau

{"title":"Comparison of dobutamine stress echocardiography and exercise stress Thallium-201 SPECT for detection of myocardial ischemia after acute myocardial infarction treated with thrombolysis.","authors":"M Previtali, G Cannizzaro, L Lanzarini, G Calsamiglia, A Poli, R Fetiveau","doi":"10.1023/a:1006169601499","DOIUrl":"https://doi.org/10.1023/a:1006169601499","url":null,"abstract":"In order to compare the ability of dobutamine stress echocardiography (DSE) and exercise Thallium-201 SPECT to detect myocardial ischemia in patients with myocardial infarction (MI) treated with thrombolysis, 43 prospectively selected patients with MI treated with thrombolysis underwent within 1 month from MI DSE, stress-redistribution-reinjection Thallium-201 SPECT and coronary angiography. The echocardiographic and scintigraphic images were analyzed for the presence of myocardial ischemia using a 11-segment left ventricular model. DSE and exercise Thallium-201 SPECT detected myocardial ischemia in the infarct zone in 72% and 72% (31/43) of patients and ischemia at a distance in 12% (5/43) and 19% (8/43) of patients with a concordance of 67% and 88%, respectively. A significant agreement between DSE and exercise Thallium SPECT was found in the evaluation of the extent of both myocardial necrosis and stress-induced myocardial ischemia. DSE and exercise Thallium SPECT showed similar sensitivity (79 vs 76%), specificity (60 vs 60%) and accuracy (77 vs 74%) for detection of a critical stenosis of the infarct-related artery; there was also no significant difference between the tests in sensitivity, specificity and accuracy for detection of the multivessel disease. In conclusion, initially after thrombolyzed MI, DSE and exercise Thallium-201 SPECT detect myocardial ischemia in the infarct zone in a high proportion of patients and show a similar accuracy for the diagnosis of a critical stenosis of the infarct-related coronary artery and of the multivessel disease.","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"15 3","pages":"195-204"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006169601499","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21336429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Harmonic imaging: echocardiographic enhanced contrast intensity and duration. 谐波成像:超声心动图增强对比强度和持续时间。

International journal of cardiac imaging Pub Date : 1999-06-01 DOI: 10.1023/a:1006140102056

M R Allen, P A Pellikka, H R Villarraga, K W Klarich, D A Foley, S L Mulvagh, J B Seward

{"title":"Harmonic imaging: echocardiographic enhanced contrast intensity and duration.","authors":"M R Allen, P A Pellikka, H R Villarraga, K W Klarich, D A Foley, S L Mulvagh, J B Seward","doi":"10.1023/a:1006140102056","DOIUrl":"https://doi.org/10.1023/a:1006140102056","url":null,"abstract":"The intensity and duration of contrast effect within the left ventricular cavity after an intravenous bolus of Levovist Injection were observed with both harmonic and fundamental imaging in nine patients with known or suspected coronary artery disease. Contrast intensity was assessed by a qualitative grading system (0, none; 1, weak; 2, moderate; 3, good) and by videodensitometric analysis of pixel intensity. Duration of left ventricular contrast effect was determined by measuring time from the initial visual appearance of contrast agent to its disappearance. The mean increase in pixel intensity within the left ventricular cavity from precontrast to peak contrast was significantly greater for second harmonic than for fundamental imaging (25.5 vs 7.1; P < 0.012). The mean contrast intensity qualitative score with harmonic imaging was higher (2.6 +/- 0.73 vs 1.2 +/- 0.44; P < 0.01) and the duration of contrast effect was longer (242 +/- 131 s vs 53 +/- 33 s; P < 0.004). Second harmonic imaging significantly enhanced contrast intensity and prolonged visible duration of contrast effect after a peripheral venous injection of Levovist.","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"15 3","pages":"215-20"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006140102056","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21336391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 21

Worsening of left ventricular diastolic function during long-term correction of anemia with erythropoietin in chronic hemodialysis patients--an assessment by radionuclide ventriculography at rest and exercise. 慢性血液透析患者长期用促红细胞生成素矫正贫血时左室舒张功能恶化——静息和运动时放射性核素心室造影评估

International journal of cardiac imaging Pub Date : 1999-06-01 DOI: 10.1023/a:1006171626861

N Topuzović

{"title":"Worsening of left ventricular diastolic function during long-term correction of anemia with erythropoietin in chronic hemodialysis patients--an assessment by radionuclide ventriculography at rest and exercise.","authors":"N Topuzović","doi":"10.1023/a:1006171626861","DOIUrl":"https://doi.org/10.1023/a:1006171626861","url":null,"abstract":"We studied the effect of correction of anemia with erythropoietin on left ventricular systolic and diastolic function at rest and exercise in 17 chronic hemodialysis patients by means of maximum exercise testing and equilibrium gated radionuclide angiocardiography on three occasions: 1) initial--before erythropoietin administration, 2) intermediate--at the time when the target hemoglobin level reached 100 g/l, and 3) long-term--after 12 months of therapy. After correction of anemia, the patients showed a significant improvement in their response to exercise regarding maximal work load achieved, exercise duration and recovery time. Ejection fraction and peak ejection rate remained unchanged during therapy. At rest, peak filling rate was reduced from 2.62 +/- 1.0 (baseline) to 2.28 +/- 0.9 (intermediate) end-diastolic volume per second, p < 0.01, while no significant difference was observed during exercise. The time to peak filling rate was prolonged significantly during EPO therapy from 157 +/- 30 to 177 +/- 28 ms at rest, p < 0.05, and from 101 +/- 24 to 130 +/- 27 ms during exercise, p < 0.01. By the time of the late study, there were no significant differences between the late and intermediate study. In conclusion, amelioration of anemia with erythropoietin in hemodialysis patients produced improvement in exercise capacity, but diastolic function worsened with therapy and this effect was maintained during the long-term treatment, while systolic function at rest and exercise remained unchanged.","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"15 3","pages":"233-9"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006171626861","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21336394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Dynamic obstruction, an unusual complication after aortic valve replacement with a stentless porcine valve. 动态梗阻，无支架猪瓣主动脉瓣置换术后的不寻常并发症。

International journal of cardiac imaging Pub Date : 1999-06-01 DOI: 10.1023/a:1006189321277

R P van Roosmalen, L H Baur, J Braun, D E Atsma, M G Hazekamp, E E van der Wall, H A Huysmans

引用次数: 1

Analysis of flow patterns using MRI. 利用MRI分析血流模式。

International journal of cardiac imaging Pub Date : 1999-04-01 DOI: 10.1023/a:1006205206534

M H Buonocore, H G Bogren

引用次数: 19

Complex flow patterns in the great vessels: a review. 大血管中复杂的流动模式:综述。

International journal of cardiac imaging Pub Date : 1999-04-01 DOI: 10.1023/a:1006281923372

H G Bogren, M H Buonocore

引用次数: 25

3D contrast-enhanced MR angiography using fluoroscopic triggering and an elliptical centric view order. 三维对比增强磁共振血管造影使用透视触发和椭圆中心视图顺序。

International journal of cardiac imaging Pub Date : 1999-04-01 DOI: 10.1023/a:1006122514980

S J Riederer, S B Fain, D G Kruger, R F Busse

引用次数: 8

Contrast enhanced body magnetic resonance angiography. 增强体磁共振血管造影。

International journal of cardiac imaging Pub Date : 1999-04-01 DOI: 10.1023/a:1006118430910

A E Stillman

引用次数: 2

Breathhold cardiac MRI and MRA. 屏气心脏MRI和MRA。

International journal of cardiac imaging Pub Date : 1999-04-01 DOI: 10.1023/a:1006138713163

G G Hartnell

引用次数: 8