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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 1847-1849 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Stress waves were generated in sections of human vascular tissue by transmitting laser pulses from a XeCl laser source through a glass fiber. Needle-type polyvinylidenefluoride hydrophones were used to detect the acoustic response of the tissue samples during ablation. The experimental arrangement allowed the discrimination in vitro between calcified hard tissue and normal arterial wall immersed in normal saline solution. Atheromatous vessels exhibited a shorter rise time and a higher peak stress than normal tissue.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1084
    Keywords: Arteries, extremities ; Arteries, laser angioplasty ; Arteries, transluminal angioplasty ; Lasers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We investigated a pulsed 504 nm dye laser at a pulse duration of 1.44 μ and a pulse rate of 10 Hz for its angioplasty capabilities. Laser energy was delivered via 9 F multi-fiber ring catheters. Our experimental data showed effective ablation of atheroma and disruption of calcified plaques at an energy fluence of 9.5 J/cm2 under saline and blood. Histologically, there was only minimal thermal injury to adjacent tissues. Irregular tissue borders after radiant energy exposure of 12.7 J/cm2, under blood, provide strong evidence for ablation by a shock-or pressure-wave mechanism. Percutaneous peripheral laser-assisted angioplasty was performed in 25 patients with arterial occlusive disease of the iliac and femoro-poplteal arteries (mean occlusion length 7.2 cm). All lesions were initially traversed by a guide-wire. Technical success was achieved in 24 out of 25 patients (96%). Laser angioplasty decreased the mean stenosis rate from 100% to 51± 12% (P 〈 0.01). The ankle-brachial index (ABI) rose from 0.48±0.16 before to 0.88±0.10 after intervention (P 〈 0.01) with a value of 0.82±0.15 at 6 months follow-up. The overall success rate, judged clinically and by ABI determinations in all patients, was 84% at a mean follow-up period of 7.9 months. The number of stand-alone laser procedure was 21%. Clinical application of the delivery devices proved to be safe due to the “over-the-wire” approach. Our prelimanary clinical data encourage further refinement of pulsed dye laser angioplasty for more efficacious debulking of atheroma.
    Type of Medium: Electronic Resource
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  • 3
    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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