International journal of cardiac imaging最新文献

{"title":"Visualization of regional myocardial depolarization by tangential component mapping on magnetocardiogram in children.","authors":"H Horigome,&nbsp;K Tsukada,&nbsp;A Kandori,&nbsp;J Shiono,&nbsp;A Matsui,&nbsp;Y Terada,&nbsp;T Mitsui","doi":"10.1023/a:1006136525382","DOIUrl":"https://doi.org/10.1023/a:1006136525382","url":null,"abstract":"<p><strong>Background: </strong>Tangential components to the body surface on magnetocardiography theoretically reflect regional myocardial current sources just below the gradiometer. The usefulness of tangential component mapping on magnetocardiography in determination of regional myocardial abnormalities has not been investigated in children.</p><p><strong>Methods: </strong>Twenty-six children with ventricular hypertrophy, including a child with a left ventricular diverticulum (aged 7 to 15), and age matched 22 healthy children (aged 7 to 15) were studied. Tangential components on magnetocardiography were measured using a newly-developed super-conducting quantum interference device system housed in a magnetically shielded room. Isomagnetic maps and current vector maps were constructed from the data obtained.</p><p><strong>Results: </strong>The peak magnetic fields and current dipoles were demonstrated to be located at the interventricular septum initially, and then were shifted to the anterior and inferior walls of the left ventricle and to the right ventricular outflow tract, successively. In patients with right ventricular hypertrophy whose systolic right ventricular pressure was over 60 mmHg, the peak magnetic fields were located in the right half with rightward directed current vectors throughout ventricular depolarization. In patients with left ventricular hypertrophy, the maximal magnetic fields during depolarization were shifted to the hypertrophic site, showing significantly stronger forces than those in healthy children (35.5+/-11.7 pT vs 26.5+/-11.9 pT, p < 0.01). In a patient with left ventricular diverticulum, two discrete depolarizing current dipoles were visualized. The mean time required in measuring MCGs among all subjects was 10 minutes.</p><p><strong>Conclusion: </strong>The time course as well as the location of the regional electrical activities of the myocardium in children can be visualized, in a short time, as a two-dimensional projection to the frontal plane by tangential component mapping on magnetocardiography.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"15 4","pages":"331-7"},"PeriodicalIF":0.0,"publicationDate":"1999-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006136525382","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21378953","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}

{"title":"Echocardiographic and Doppler study of patients with heatstroke and heat exhaustion.","authors":"M S Shahid,&nbsp;L Hatle,&nbsp;H Mansour,&nbsp;L Mimish","doi":"10.1023/a:1006070708952","DOIUrl":"https://doi.org/10.1023/a:1006070708952","url":null,"abstract":"<p><p>This is a two-dimensional and Doppler echocardiographic study of the hemodynamic changes in patients with heatstroke and heat exhaustion. It demonstrates that the hemodynamic changes in severe heat exposure reflect a hyperdynamic circulation with tachycardia and high cardiac output states. Relative hypovolemia was more pronounced in patients with heatstroke compared to patients with heat exhaustion. Signs of peripheral vasoconstriction were more often present in patients with heatstroke, while patients with heat exhaustion more often demonstrated peripheral vasodilatation.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"15 4","pages":"279-85"},"PeriodicalIF":0.0,"publicationDate":"1999-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006070708952","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21378947","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}

{"title":"Assessment of the mechanical properties of coronary arteries using intravascular ultrasound: an in vivo study.","authors":"M J Williams,&nbsp;R A Stewart,&nbsp;C J Low,&nbsp;G T Wilkins","doi":"10.1023/a:1006279228534","DOIUrl":"https://doi.org/10.1023/a:1006279228534","url":null,"abstract":"<p><p>The pressure-area relation of coronary arteries provides important information about the mechanical properties of these vessels. In human subjects methodological limitations have precluded measurement of instantaneous compliance and coronary stress in vivo. The purpose of this study was to assess a new method for measuring instantaneous values of coronary artery compliance and wall stress utilizing simultaneously acquired pressure and intravascular ultrasound measurements of vessel area. Ten subjects with coronary artery disease had intravascular ultrasound studies of the proximal left anterior descending or circumflex coronary arteries. Coronary luminal area was measured with a 30-MHz (3F or 3.5F) intravascular ultrasound catheter and simultaneous coronary pressure measured with a 2F micromanometer-tipped catheter. Using this technique the nonlinear pressure-area relation and mean circumferential wall stress were determined over the physiological pressure range. Coronary artery compliance at 100 mmHg ranged from 0.010 to 0.052 mm2/mmHg (mean +/- SD, 0.020+/-0.012 mm2/mmHg). Peak systolic circumferential stress ranged from 0.52 to 2.03 x 10(6) dyn/cm2 (1.09+/-0.42 x 10(6) dyn/cm2). This study describes a new method of determining coronary artery mechanical properties over the physiological pressure range. This technique may be useful in further studies of coronary artery mechanics.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"15 4","pages":"287-94"},"PeriodicalIF":0.0,"publicationDate":"1999-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006279228534","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21378948","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}

{"title":"Regional differences in shape and load in normal and diseased hearts studied by three dimensional tagged magnetic resonance imaging.","authors":"Y F Petrank,&nbsp;S J Dong,&nbsp;J Tyberg,&nbsp;S Sideman,&nbsp;R Beyar","doi":"10.1023/a:1006132709895","DOIUrl":"https://doi.org/10.1023/a:1006132709895","url":null,"abstract":"<p><strong>Objectives: </strong>We aimed to characterize regional geometry in relation to load in two groups of patients with hypertrophic cardiomyopathy (HCM) and right ventricular pressure overload (RVPO) in relation to a group of subjects with normal left ventricular (LV) function.</p><p><strong>Background: </strong>Both these diseases are associated with marked changes in LV shape and function, which have not been studied with detailed three dimensional tools.</p><p><strong>Methods: </strong>Three dimensional (3D) tagged magnetic resonance imaging (MRI) was used to characterize the 3D geometry and regional stresses of the left ventricles in patients with HCM and RVPO. Curvatures, stresses, wall thickness, and endocardial motion were calculated from surface and volume elements.</p><p><strong>Results: </strong>Hearts with RVPO exhibited more circumferential and meridional flattening of the septum than normal and HCM hearts. The stress indices were lowest in the HCM hearts, compared to normal and RVPO hearts, due to the larger thicknesses. There was a more significant difference between lateral wall motion and other regional wall motions in the HCM and RVPO hearts as compared to normal hearts.</p><p><strong>Conclusions: </strong>It is suggested that curvature and stress mapping by 3D tagged MRI can be used as an important clinical tool for characterizing and distinguishing between healthy and diseased hearts. The results provided here validated previous knowledge on HCM and RVPO known from planary imaging methods.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"15 4","pages":"309-21"},"PeriodicalIF":0.0,"publicationDate":"1999-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006132709895","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21378951","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}

{"title":"Double outlet right ventricle assessed with magnetic resonance imaging.","authors":"R A Niezen,&nbsp;R P Beekman,&nbsp;W A Helbing,&nbsp;E E van der Wall,&nbsp;A de Roos","doi":"10.1023/a:1006112529535","DOIUrl":"https://doi.org/10.1023/a:1006112529535","url":null,"abstract":"<p><p>In this article the value of magnetic resonance (MR) imaging for the evaluation of double outlet right ventricle (DORV) is reviewed from the literature and illustrated with several cases. MR imaging can be used for the determination of cardiac anatomy at initial diagnosis and may provide functional information during the follow-up of patients after surgical correction.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"15 4","pages":"323-9"},"PeriodicalIF":0.0,"publicationDate":"1999-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006112529535","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21378952","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}

{"title":"The flow-function relationship in patients with chronic coronary artery disease and reduced regional function: a Doppler transesophageal and bidimensional transthoracic echocardiography study.","authors":"M Baroni,&nbsp;M A Torres,&nbsp;S Maffei,&nbsp;A Varga,&nbsp;M Terrazzi,&nbsp;A Biagini,&nbsp;E Picano","doi":"10.1023/a:1006122725824","DOIUrl":"https://doi.org/10.1023/a:1006122725824","url":null,"abstract":"<p><strong>Background: </strong>Infra-low dose dipyridamole allows one to selectively explore myocardial viability. Transesophageal echocardiography Doppler measurement of left anterior descending coronary artery flow at baseline and following dipyridamole is an efficient tool to assess coronary flow response. Aim of this study was to determine the flow-function relationship during coronary vasodilatory stress in patients with coronary artery disease and baseline dysfunction.</p><p><strong>Methods and results: </strong>Twelve patients with resting dyssynergies and 6 controls underwent assessment of regional function and of left anterior descending blood flow velocity. Flow and function were evaluated at rest and following infra-low dose dipyridamole (0.28 mg/Kg over 4 min). Controls showed a normal function at rest and after dipyridamole. Six patients ('Responders') with resting dyssynergies showed an improvement in segments of left anterior descending artery territory, whereas the other six ones ('Non-responders') showed no functional change. Controls and 'Responders' had similar values of resting peak diastolic left anterior descending artery flow velocity both at rest and after dipyridamole, whereas 'Non-responders' showed a blunted flow response to dipyridamole.</p><p><strong>Conclusion: </strong>Myocardial segments with a resting dysfunction and a contractile reserve more often exhibit a residual flow response, whereas segments with fixed pattern show a flat flow response during coronary vasodilator stress.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"15 4","pages":"271-8"},"PeriodicalIF":0.0,"publicationDate":"1999-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006122725824","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21379664","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}

{"title":"Neovascularity related to mural thrombus in endomyocardial fibrosis.","authors":"M Meuwissen,&nbsp;G A Somsen,&nbsp;J J Piek","doi":"10.1023/a:1006166810931","DOIUrl":"https://doi.org/10.1023/a:1006166810931","url":null,"abstract":"<p><p>We report a 30-year old, previously healthy, Ghanese woman admitted with sudden onset of dyspnoe, hemoptoe and right-sided chest pain due to endomyocardial fibrosis with secondary pulmonary emboli Coronary angiography revealed a myocardial \"blush\". This finding may focus attention to the presence of mural thrombus that may have diagnostic and therapeutic consequences.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"15 3","pages":"205-7"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006166810931","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21336390","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}

{"title":"Catheter-induced vasospasm in the right external iliac and femoral arteries during a cardiac diagnostic procedure.","authors":"O Ergene,&nbsp;A Tastan,&nbsp;Y Seyithanoglu,&nbsp;C Nazli,&nbsp;O Kozan,&nbsp;U Ergene,&nbsp;V Keskin","doi":"10.1023/a:1006179113054","DOIUrl":"https://doi.org/10.1023/a:1006179113054","url":null,"abstract":"<p><p>Catheter-induced vasospasm of small caliber arteries, such as the coronary arteries, is frequently observed during cardiac catheterization, but obstruction of the large caliber arteries has not previously been reported. Here we present two cases in which femoral and external iliac arteries were totally obstructed due to spasm during diagnostic coronary angiography.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"15 3","pages":"189-93"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006179113054","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21336428","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}

{"title":"Comparison of normal and diseased pulmonary artery morphology by intravascular ultrasound and histological examination.","authors":"P Stähr,&nbsp;H J Rupprecht,&nbsp;T Voigtländer,&nbsp;M Otto,&nbsp;K Rudigier,&nbsp;R Erbel,&nbsp;P Kearney,&nbsp;J Meyer","doi":"10.1023/a:1006146422068","DOIUrl":"https://doi.org/10.1023/a:1006146422068","url":null,"abstract":"<p><p>The study was performed to determine the morphological characteristics of normal and diseased pulmonary arteries by ultrasound (intravascular ultrasound, IVUS) and histology. Forty-nine cadaver segments of pulmonary arteries from 16 postmortem patients were imaged in vitro by IVUS and compared to matched histological sections. The pulmonary vasculature of 11 patients with pulmonary hypertension was investigated in vivo by IVUS. In the in vitro study, 34 of a total of 143 histological sections of the segmental pulmonary arteries showed fibrotic wall components; the remaining 109 sections had regular components. Imaged by IVUS, the wall of the regular and fibrotic arteries revealed a single layer histologically, representing the intima, media, adventitia and connective tissue. Adjacent lung tissue could be detected by IVUS and was confirmed by the histological section. In three patients with a history of chronic embolic pulmonary hypertension, IVUS revealed thrombi or a double vessel wall layer. Histologically, the material extracted after pulmonary thromboendarterectomy in two patients showed wall-adherent thrombus features of early organization. In all other patients only a single wall layer was seen. The vessel walls (intima, media, adventitia and connective tissue) of regular and slightly fibrosed pulmonary arteries show only a single layer. Wall-adherent organized thrombi in chronic embolic pulmonary hypertension can be detected by IVUS as a second inner vessel layer. Thus IVUS may represent an additional tool for detecting chronic embolic pulmonary hypertension when the results of pulmonary angiography or computed tomography are not definite.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"15 3","pages":"221-31"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006146422068","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21336393","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}

{"title":"Diagnosis and management of anomalous origin of the right coronary artery from the left coronary sinus.","authors":"M A Bekedam,&nbsp;H W Vliegen,&nbsp;J Doornbos,&nbsp;J W Jukema,&nbsp;A de Roos,&nbsp;E E van der Wall","doi":"10.1023/a:1006161821388","DOIUrl":"https://doi.org/10.1023/a:1006161821388","url":null,"abstract":"<p><p>The anomalous origin of the right coronary artery (RCA) from the left sinus of Valsalva coursing between the aorta and the pulmonary artery or right ventricular outflow tract, is considered a potentially fatal abnormality which may require surgery. However, diagnosing the correct course with coronary arteriography may be difficult. Fast gradient echo magnetic resonance (MR) imaging can be helpful to identify and confirm the course of aberrant coronary arteries and their relationship to the surrounding tissue. In this study, diagnostic procedures and management are described of four patients in whom the RCA originated from the left sinus of Valsalva. Although reported as investigational by the Task Force document on MR imaging by the European Society of Cardiology we are of the opinion that MR coronary angiography may have an important future role in the assessment of anomalous coronary arteries.</p>","PeriodicalId":77179,"journal":{"name":"International journal of cardiac imaging","volume":"15 3","pages":"253-8; discussion 259"},"PeriodicalIF":0.0,"publicationDate":"1999-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1023/a:1006161821388","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"21336396","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}