PubMed · 3083723
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P L Moore. 1986. Nitroglycerin improves venous cannulation.. https://doi.org/10.1097/00000542-198604000-00036
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Plasma-based sterilization is a promising alternative to ethylene oxide (EO) for reprocessing of electrophysiology catheters. To assess its safety in terms of material damage, modifications of surface and bulk properties as well as hydrolytic stability of sterilized catheters were evaluated. Polyurethane (PU) single-use electrophysiology catheters were subjected to one, five, and ten sterilization cycles by Sterrad-100S and Plazlyte, as well as by pure EO for comparison. Surface analysis techniques (ATR-FTIR, XPS, DCA) showed oxidation limited to the near-surface layer induced by both plasma-based sterilizers, whereas EO induced slight but deeper alkylation. Using bulk analysis techniques (RP-HPLC, SEC), oligomer alteration was observed after all three sterilization techniques, without modification of molecular weights. Hydrolytic stability of catheters was slightly changed by plasma-based sterilization, with a small increase in released oligomers. Finally, although Plazlyte and Sterrad are both plasma-based techniques, they induced different impacts on catheters, such as the degradation of an additive with Sterrad, and a clear difference in coloration with Plazlyte.
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The authors introduced dilatation of postoperative gastric outlet stenoses in 1981 and later in peptic, corrosive and postvagotomic gastric outlet stenoses. They performed gastric outlet stenoses dilatation with balloon catheter 153 times on 66 patients between September 1981-1999. On three of 8 malignant cases--who had dilatation because of recidive inoperable tumor--metal prosthesis implantation had been performed and others underwent surgery. On 58 patients who suffered from benign stenoses 144 balloon catheter dilatation had been done. After dilatation during the follow up time at 39/58 cases (67.2%) there was no need for operation. The stenoses of anastomosis after antrectomy and pyloric preserving pancreatoduodenectomy at 15 cases had been cured by dilatation. At pyloric and bulbus stenoses two third of the patients, 14 from 21 (67%) and at the cases of corrosive gastric outlet stenoses 6 of 17 (35%) had been treated successfully by dilatation. At postvagotomic functional stenoses 80% of the patients were treated successfully by 23 mm diameter balloon catheter. The dilatation has no long-term effect in malignant stenoses so it was used just for diagnosis or in rare inoperable cases for the preparation of prosthesis implantation. After dilatation therapy they detected one case of artery hemorrhage and two cases of perforation. The balloon catheter dilatation of the gastric outlet stenoses is a very important diagnostic and endoscopic therapeutic method which--depending on the cause--makes operation avoidable in 66% (35-100) of the benign stenoses.