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  • 1
    ISSN: 1435-1285
    Keywords: Key words Palmaz-Schatz-Stent – AVE-Micro-Stent – restenosis-rate – high pressure implantation – morphology of stenosis ; Schlüsselwörter Palmaz-Schatz-Stent – AVE-Micro-Stent – Restenoserate – Hochdruckimplantation – Stenosemorphologie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Late results of interventional procedures utilizing coronary stents are largely determined by the rate of restenosis. So far few data are available addressing the effect of stent design, implantation pressure and morphologic factors on this crucial variable. Therefore we analyzed the coronary angiogramms obtained in 259 patients before, immediately after and at 3 to 6 months following stent implantation for obstructive coronary disease. A total of 196 AVE-Micro-Stents and 142 Palmaz-Schatz-Stents were implanted into 307 stenoses. In 126 stenoses there were implanted only Palmaz-Schatz-Stents, in 170 only AVE-Micro-Stents and in 11 Stenoses there were implanted Palmaz-Schatz- as well as Micro-Stents. Restenosis was defined as an over 50% stenosis at follow up. No significant difference was detected with regard to global restenosis rate at an average of 4 months following implantation (Palmaz-Schatz 33%, Micro-Stent 27%). If results were analzyed according to implantation pressure however, there was a significantly lower restenosis rate for AVE Micro-Stens implanted with 〉 10 atm (17%) as compared to ≤ 10 atm (35%, p 〈 0.02) and as compared to Palmaz-Schatz-Stents (34%, p 〈 0.02), which were also implanted with high pressure over 10 atm. In addition to implantation pressure, vessel segment and morphology of stenosis proved to be important determinants of late results. In this series of patients the AVE-Micro-Stent compared favourably to the Palmaz-Schatz-Stent not only with respect to a significantly lower restenosis rate, when implanted with pressures 〉 10 atm, but also with regard to its superior flexibility and handling characteristics.
    Notes: Zusammenfassung Der Langzeiterfolg einer Stent-Implantation wird im wesentlichen durch die Restenoserate bestimmt. Bisher sind noch nicht alle Faktoren geklärt, welche die Restenoserate beeinflussen. Daher wurde in der vorliegenden Studie der Einfluß zweier unterschiedlicher Stentdesigns, der Implantationsart (Hochdruckimplantation 〉 10 atm, Niederdruckimplantation ≥ 10 atm), der Lokalisation der Stenose sowie der Stenose-Morphologie untersucht. Hierzu wurden die koronarangiographischen Untersuchungen von 259 Patienten, bei denen in 307 Stenosen insgesamt 196 Micro- und 142 Palmaz-Schatz-Stents implantiert worden waren, quantitativ vor, direkt nach und 3-6 Monate nach Stent-Implantation retrospektiv ausgewertet. Es fand sich zwischen den beiden Stent-Typen kein signifikanter Unterschied in der Restenoserate (Palmaz-Schatz 33%, Micro 27%). Bei Hochdruckimplantation des Micro-Stents mit Drucken von 〉 10 atm zeigte sich jedoch eine signifikant niedrigere Restenoserate sowohl im Vergleich zu den mit niedrigen Drucken implantierten Micro-Stents (17% versus 35%, p 〈 0,02) als auch im Vergleich zu den nahezu ausnahmslos mit Hochdruck implantierten Palmaz-Schatz-Stents (17% versus 34%, p 〈 0,02). Lediglich 11 Palmaz-Schatz-Stents wurden mit einem Druck von ≥ 10 atm implantiert. Ein Grund hierfür war aus den Untersuchungsprotokollen retrospektiv nicht zu entnehmen. In der LAD lag die Restenoserate mit 39% signifikant höher als in der RCX (21%) und RCA (22%, p 〈 0,02). Bei komplexen Typ-C-Stenosen zeigt sich eine höhere Restenoserate (39%) als bei Typ-A- (17%) und Typ-B-Stenosen (26%, p 〈 0,05). Insgesamt zeigt diese Studie Vorteile für den mit Hochdruck implantierten AVE-Micro-Stent aufgrund seiner geringeren Restenoserate im Vergleich zum Palmaz-Schatz-Stent.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0584
    Keywords: Thrombin-antithrombin III complex ; Prothrombin fragment 1+2 ; Blood withdrawal technique ; Catheter ; Venipuncture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To evaluate the influence of different blood sampling techniques on test results of thrombin-antithrombin III complex (TAT) and prothrombin fragment 1+2 (F1+2) serial determinations were performed. In six groups of nonrandomized patients (ten patients each) the concentrations of the coagulation markers of blood samples from central catheters (internal jugular, caval, Shaldon, pulmonary artery) and peripheral cannulas (17G and 18G) were compared with those of blood samples obtained simultaneously from direct venipunctures of the contralateral arm. Medians and 25th–75th percentiles of TAT and Fl+2 concentrations of plasmas obtained from central catheters were not different from those taken from venipunctures. When Δ mean values (catheter — venipuncture) were calculated negative results were obtained, indicating lower concentrations measured from blood sampled through central catheters with the exception of blood that taken from Shaldon catheters. Only for TAT concentrations significantly were lower values measured in blood samples taken from internal jugular catheters when compared with blood samples obtained from direct venipunctures. Significantly higher TAT concentrations were determined in blood samples obtained from Shaldon catheters. For both coagulation markers correlations were found between concentrations in blood samples from central catheters and venipunctures. In blood samples taken from peripheral venous cannulas only F1+2 concentrations correlated with the concentrations found in samples from direct venipuncture. In contrast to F1+2, TAT concentrations measured from blood samples via peripheral cannulas were determined significantly higher than those taken from direct venipunctures. Blood drawn from peripheral catheters is not suited for the determination of TAT and F1+2 due to frequently encountered activation of coagulation, while blood sampling with central catheters can be regarded as an alternative to venipuncture.
    Type of Medium: Electronic Resource
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