Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1435-1285
    Keywords: Key words Angiography – coronary disease – scintigraphy – 3D fusion imaging ; Schlüsselwörter Angiographie – Koronare Herzkrankheit – Szintigraphie – 3D Fusionsbild
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Interpretation dreidimensionaler (3D) Strukturen des Koronarbaumes und des Myokards durch den Kliniker erfordert eine subjektive, visuelle Integration zweidimensionaler (2D) Bilder von kardialen diagnostischen Verfahren wie der Koronarangiographie und der Myokardszintigraphie. Obwohl bei einer gewöhnlichen 2D Betrachtung der Myokardszintigraphie die myokardialen Perfusionssegmenten grob den drei Hauptgebieten des koronar-arteriellen Systems zugeordnet werden, findet sich jedoch eine Übereinstimmung der myokardialen Standardverteilungsgebiete mit dem individuellen pathologisch-anatomischen Koronarbaum bei nur 50–60% der Patienten. Die mentale Integration von 2D Bildern der Koronarangiographie und der myokardialen Szintigraphie erlaubt daher nicht unbedingt eine genaue Zuordnung von bestimmten myokardialen Perfusionsgebieten zu den korrespondierenden Gefäßsegmenten. Für eine objektivere Zuordnung der ienzelnen Gefäßsegmente des Koronarbaumes zu den korrespondierenden myokardialen Regionen haben wir daher eine “3D Fusionstechnik” entwickelt und diese bei Patienten mit koronarer Herzkrankheit angewendet. Ursache- und Wirkungsbeziehung können durch eine 3D Datenfusion offensichtlicher werden und den Vergleich zwischen Anatomie und Physiologie erleichtern. Erste Ergebnisse zeigen, daß unser neuentwickeltes 3D Fusionsbild nützlich ist für eine genaue Zuordnung der koronaren Gefäßsegmente zu den korrespondierenden myokardialen Perfusionsgebieten, und deuten darauf hin, daß es dem Kliniker eine umfassende und genaue Beurteilung des Zustandes des Herzens ermöglicht.
    Notes: Summary The interpretation of three-dimensional (3D) structures of the coronary tree and the myocardium by a clinician demands a subjective visual integration of two-dimensional (2D) images of cardiac diagnostic procedures like coronary angiography and myocardial scintigraphy. Although in the conventional analysis of 2D display scintigraphic myocardial perfusion segments are arbitrarily assigned to three major coronary artery systems, the standard myocardial perfusion distribution territories correspond with the individual pathologic-anatomic coronary tree in only 50–60% of the patients. Hence, the mental integration ob both 2D images of coronary angiography and myocardial scintigraphy does not necessarily allow an accurate assignment of particular myocardial perfusion regions to the corresponding vessels. For an objective assignment of each vessel segment of the coronary tree to the corresponding myocardial regions, we have developed a 3D “fusion image” technique and applied it to patients with coronary artery disease. Cause-and-effect relationships may be more obvious with 3D data fusion and may enable an easier comparison of anatomy and physiology. Preliminary results demonstrate that our newly developed 3D fusion image is useful for accurate assignment of coronary vessel segments to the corresponding myocardial perfusion regions and suggest that it may allow the clinician a comprehensive and accurate assessment of the patient's myocardial status.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für Kardiologie 89 (2000), S. 63-71 
    ISSN: 1435-1285
    Keywords: Key words Patent foramen ovale – paradoxical embolism – stroke – echocardiography ; Schlüsselwörter Foramen ovale – paradoxe Embolie – Apoplex – Echokardiographie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Ungeachtet der Schwierigkeiten bei der Bestätigung einer paradoxen Embolie konnte der Zusammenhang zwischen dem Vorliegen eines ventiloffenen Foramen ovale (PFO) und zerebraler Ischämie-Ereignisse unklarer Ursache wiederholt nachgewiesen werden. Darüber hinaus wurde berichtet, daß das Risiko von Embolie-Rezidiven bei diesen Patienten 3–4% pro Jahr beträgt. Eine zuverlässige Risikostratifikation der Patienten mit PFO auf der Basis klinischer oder echokardiographischer Befunde ist bisher – mit Ausnahme der hämodynamisch wirksamen Lungenembolie – in der Regel nicht möglich. Das Vorliegen eines Vorhofseptumaneurysmas und eine weite Öffnung des PFO während des Herzzyklus oder ein großer interatrialer Shunt bei der transösophagealen Kontrast-Echokardiographie werden jedoch von manchen Autoren als Risikofaktoren angesehen. Die sekundäre Prävention paradoxer Embolien mittels oraler Antikoagulanzen (Warfarin) beinhaltet das Risiko einer signifikanten Blutung (Inzidenzrate 2–5% pro Jahr) und mangelhaften Compliance der Patienten. Außerdem scheint diese Therapieform wenig effektiv zu sein. Der chirurgische Verschluß des PFO ist ein technisch ausgereifter, sicherer Eingriff. Erste Berichte bestätigen seine hohe Effektivität hinsichtlich der Rezidivprophylaxe, weitere prospektive Studien sind jedoch erforderlich, um die für eine chirurgische Behandlung geeigneten Patienten festzulegen. Kathetertechnische Verfahren zum PFO-Verschluß stehen ebenfalls zur Verfügung und befinden sich derzeit in der Phase der klinischen Erprobung. Weitere technische Verbesserungen erscheinen jedoch erforderlich, um den Ablauf des interventionellen Eingriffes zu vereinfachen, die Stabilität dieser Systeme zu erhöhen und die Komplikationsgefahr zu minimieren.
    Notes: Summary Notwithstanding the difficulties in definitely confirming paradoxical embolism, the association between patent foramen ovale (PFO) and cryptogenic stroke has repeatedly been demonstrated in clinical studies. Moreover, the recurrence rate of cerebral ischemia in patients with PFO and an unexplained stroke was found to be 3–4% per year in two recently published series. With the exception of right atrial pressure elevation in the setting of major pulmonary embolism, a reliable risk stratification of patients with PFO based on clinical or echocardiographic findings is not yet possible. The presence of atrial septal aneurysm, a wide opening of the defect during the cardiac cycle and a large atrial shunt have been implicated as risk factors by some investigators. Long-term prevention of paradoxical embolism with oral anticoagulants seems to be of questionable benefit. Besides, these agents are poorly tolerated and carry the risk of significant or fatal bleeding at a rate of 2–5% per year. Surgery of the atrial septum has been performed for many decades in patients with atrial septal defect and evidence accumulates that it is a safe and highly effective procedure in patients with PFO. At present, surgical closure of the PFO appears to be the treatment of choice for secondary prevention of paradoxical embolism. However, further studies are needed to define the appropriate candidates for surgical treatment. Devices for catheter-based sealing of PFO are also available and are currently being evaluated in clinical trials. However, experience with their use remains confined to specialized centers. Furthermore, further technical improvements of these systems are needed in order to optimize successful delivery and positioning, increase their long-term stability, and reduce periprocedural complications.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Intensivmedizin und Notfallmedizin 37 (2000), S. S099 
    ISSN: 1435-1420
    Keywords: Key words Thrombocytopenia – heparin – thromboembolism – anticoagulants – hirudin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary  Heparin-induced thrombocytopenia (HIT), next to bleeding complications, is the most important side-effect of heparin therapy in cardiac patients and the most frequently found thrombocytopenia induced by medication. Two types of HIT are distinguished on the basis of both severity of disease, and pathophysiology: type I HIT is an early, transient, clinically harmless form of thrombocytopenia, due to direct heparin-induced platelet aggregation. Thromboembolic complications are usually not seen. No treatment is required. A normalization of platelet count even if heparin is continued is a usual observation. Type II HIT is more severe than type I HIT and is frequently complicated by extension of preexisting venous thromboembolism or new arterial thrombosis. The thrombocytopenia is caused by a pathogenic heparin-dependent IgG antibody (HIT-IgG) that recognizes as its target antigen a complex consisting of heparin and platelet factor IV. Type II HIT should be suspected when the platelet count falls to less than 100,000 per cubic millimeter or less than 50% of the base line value 5 to 15 days after heparin therapy is begun, or sooner in a patient who received heparin in the recent past. The clinical diagnosis of type II HIT can be confirmed by several sensitive assays. In cases of type II HIT, heparin must be stopped immediately. However, if the patient requires continued anticoagulant therapy for an acute event such as deep venous thrombosis, substitution of an alternative rapid-acting anticoagulant drug is often needed. In the authors experience Danaparoid sodium, a low-sulfated heparinoid with a low cross-reactivity (10%) to heparin, can be regarded as an effective anticoagulant in patients with type II HIT. Preliminary experiences with intravenous recombinant hirudin are also encouraging and suggest that this direct thrombin inhibitor will emerge as a valuable alternative treatment for patients who suffer from HIT.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1573-0743
    Keywords: coronary disease ; digital angiography ; myocardial perfusion ; 3D imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In patients with coronary artery disease coronary angiography plays an important role in the clinical decision-making process. However, it has been recognized that no simple relation exists between the visually or quantitatively evaluated severity of coronary artery stenoses and its effects on regional myocardial perfusion. This paper describes for the first time the development and application of a 3D technique that visualizes and quantifies regional myocardial perfusion parameters from biplane coronary angiograms by using the impulse response analysis technique. The 3D reconstructed coronary tree is automatically superimposed on the 3D perfusion image to generate and visualize an ‘integrated’ 3D image. The preliminary results in patients with critical coronary artery stenoses indicate that our combined 3D fusion image provides flow information from the major coronary arteries. This 3D fusion image may provide useful information in the management of patients with coronary artery disease.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...