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  • Schlüsselwörter PTCA – GP IIb/IIIa Antagonisten –¶Akuter Gefäßverschluss  (1)
  • Terceira Rift  (1)
  • 1
    ISSN: 1435-1285
    Keywords: Key words PTCA –¶GP IIb/IIIa antagonists –¶abrupt vessel closure ; Schlüsselwörter PTCA – GP IIb/IIIa Antagonisten –¶Akuter Gefäßverschluss
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die klinische Wirksamkeit von GP IIb/IIIa Antagonisten wurde bei präinterventioneller prophylaktischer Applikation in großen klinischen Studien nachgewiesen. Ziel dieser prospektiven Studie war es, die Wirksamkeit von Abciximab bei der Anwendung in „bail-out” Situationen zu untersuchen.¶   Methoden: Insgesamt wurden bei 104 (5,5%) der 1903 Patienten, welche im Beobachtungszeitraum in unserem Zentrum dilatiert wurden, akute oder drohende Gefäßverschlüsse beobachtet. In dieser Situation wurde Abciximab in einer Dosierung von 0,25mg/kg als Bolus, gefolgt von einer Infusion von 10μg/min über 12 Stunden appliziert. Kurz nach der Gabe des Bolus wurde eine erneute PTCA durchgeführt. Am Ende der Intervention wurde die Schleuse belassen und nach 24 Std. eine Kontrollangiographie durchgeführt.¶   Ergebnisse: Bei 100 der 104 Patienten konnte ein ausreichender (TIMI III) Fluss wiederhergestellt werden. Bei 4 Patienten war die zusätzliche Implantation eines Stents notwendig. Eine Kontrollangiographie am Folgetag zeigte in allen bis auf 2 Fälle offene Gefäße mit gutem antegraden Fluss (TIMI III). Bei 4 Patienten trat nach der Intervention ein subakuter Gefäßverschluss auf. Drei von ihnen verstarben trotz einer sofort durchgeführten Notfall-ACVB OP. Das 12 Monats Follow-up beinhaltet den klinischen Status sowie eine Kontrollangiographie des Zielgefäßes. Während des Nachbeobachtungszeitraums kam es bei 15 Patienten zu einem klinischen Ereignis (2 MI, 8 ACVB, 5 Re-PTCA).¶   Schlussfolgerung: Die Ergebnisse dieser prospektiven Studie zeigen die hohe Wirksamkeit von Abciximab in „bail-out” Situationen während oder direkt nach der PTCA. Weitere Studien sollten dieses Konzept mit dem der prophylaktischen Behandlung vergleichen.
    Notes: Summary The administration of GP IIb/IIIa antagonists has been shown to be effective in reducing myocardial infarction and cardial death when given before PTCA. This prospective study was performed to determine the efficacy of abciximab in a bail-out situation to manage threatened or acute vessel closure.¶   Methods: Acute or threatened vessel closure was observed in 104 (5.5%) out of 1903 consecutive patients treated with PTCA in our institution. Of the 104 patients 46 (44%) were treated for unstable angina (CCS IV). Abciximab was administered in bail-out situations in a dosage of 0.25mg/kg given as a bolus, which was followed by an intravenous infusion of 10μg/min over 12 hours. Repeat PTCA was performed shortly after the administration of the abciximab bolus. After the procedure, the sheathe was left in place and control angiography was carried out 24 h later.¶   Results: In 100 of the 104 patients TIMI flow III could be restored by abciximab therapy and RePTCA. In 4 patients an additional stent implantation was necessary due to persistent flow limitation. One day post PTCA, early follow-up angiography demonstrated patency of all vessels except two. In-hospital events occurred in 4 patients. Three of these patients underwent emergency CABG due to subacute vessel closure a few hours after PTCA and died during or directly after surgery. Follow-up after one year included clinical status and control angiography of the target vessel. During long-term follow-up, MACE occured in 15 patients (2 MI, 8 CABG and 5 RePTCA).¶   Conclusion: The results of this prospective trial demonstrate the efficacy of abciximab therapy in bail-out situations occurring during or early after PTCA. The use of abciximab in bail-out situations appears clinically beneficial. Further studies have to compare the efficacy of this approach with prophylactic abciximab treatment.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2021-09-15
    Description: The Dom João de Castro seamount in the Hirondelle Basin (Azores) is a central volcano on the ultraslow diverging Terceira Rift axis. The combination of structural and geochemical data provides insights into the evolution of central volcanoes in oceanic rift systems above the Azores melting anomaly. The orientation of fault scarps and volcanic structures at D. João de Castro and the adjacent Castro fissure zone indicate that the regional SW‐NE extending stress field dominates the morphology of the NW Hirondelle Basin. The regional tectonic stress field controls the crustal melt pathways and leads to dike emplacement along fissure zones and the prevalent eruption of mafic lavas. The occurrence of mafic to felsic lavas at D. João de Castro gives evidence for both a deep and a shallow crustal melt reservoir generating a subordinate local stress field at the seamount. New Sr‐Nd‐Pb isotope data along with incompatible trace element ratios indicate that D. João de Castro and the Castro Ridges originated from similarly heterogeneous mantle source but did not form simultaneously. Our new model implies that central volcanoes along the Terceira Rift form by the growth of volcanic ridges and transitioned into circular edifices after magmatic systems generate local changes in the regional lithospheric stress field. The geometry of D. João de Castro and other magmatic systems along the Terceira Rift combined with the alkaline nature of the erupted lavas, and the large lithosphere thickness indicates that young oceanic rifts are more similar to continental rifts rather than mid‐ocean ridges.
    Description: Plain Language Summary: Dom João de Castro seamount is a large submarine volcano located in the submarine Hirondelle Basin in the Azores archipelago. The Hirondelle Basin is formed as a result of extensional forces in the oceanic crust along the Azorean Terceira Rift that causes rifting of the Eurasian and Nubian plates. The presence of the D. João de Castro volcano and several elongated volcanic ridges inside the basin shows that the extensive magmatic activity in the Azores contributes to the opening of the basin. By quantifying the orientations of the tectonic and volcanic structures in the basin, it can be shown that the formation is controlled by a dominant SW‐NE directed extensional stress combined with extensive magmatic activity. Based on combined structural and geochemical observations, we conclude that the D. João de Castro seamount formed from the growth of elongated volcanic ridges and transitioned into a circular edifice after a magma system generates a local change in the crustal stress field. The geometry and geochemical composition of volcanic rocks from the D. João de Castro magmatic system, as well as other magmatic systems along the Terceira Rift are more similar to continental rift systems rather than oceanic spreading centers.
    Description: Key Points: D. João de Castro seamount in the Terceira Rift, Azores is influenced by a SW‐NE regional transtensional and a local radiating stress field. Structural, seismic, and geochemical data imply formation by the growth of volcanic ridges along with local stress field changes. The geometry, chemistry, and rifting rates of the Terceira Rift are more comparable to continental rifts rather than mid‐ocean ridges.
    Description: Deutsche Forschungsgemeinschaft (DFG) http://dx.doi.org/10.13039/501100001659
    Keywords: 551 ; 559 ; Azores ; central volcano ; intraplate volcanism ; melt transport ; rifting ; Terceira Rift
    Type: article
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