Minimally invasive therapy & allied technologies : MITAT : official journal of the Society for Minimally Invasive Therapy
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Minim Invasive Ther Allied Technol · Jan 2008
Comparative StudyOpen vs. laparoscopic pyloromyotomy--a retrospective analysis.
Laparoscopic pyloromyotomy has obtained increasing importance in the last years. However, there is no proof of an obvious advantage of the laparoscopic over the open approach. This retrospective analysis of 157 infants with pyloromyotomies (129 open and 28 laparoscopic procedures) should settle the benefit of one of these procedures. ⋯ There was no difference in the complication rate as compared to the open procedure. The recovery time was shorter in the laparoscopic group. A superiority of the laparoscopic pyloromyotomy over the open procedure is suggested by the ascertained data.
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Minim Invasive Ther Allied Technol · Jan 2008
Comparative StudyBipolar radiofrequency ablation: is the shape of the coagulation volume different in comparison to monopolar RF-ablation using variable active tip lengths?
We investigated the differences between bipolar and monopolar radiofrequency (RF)-ablation devices regarding the shape and volume of the induced coagulation zone. RF-ablations were performed in freshly excised porcine liver. For bipolar RF-ablation needle electrodes with 9, 20 and 30 mm active tip lengths were used. ⋯ At 20 and 30 mm tip length bipolar RF-ablation created significantly larger areas of necrosis (20 mm: 3.498+/-0.605 cm(3) vs. 2.569+/-0,620 cm(3), 30 mm: 7.441+/-906 cm(3) vs. 3.317+/-0.737 cm(3)). Using the probes with 9 mm, active length areas of necrosis induced by the monopolar system are more spherical, whereas with 20 and 30 mm active tip length the bipolar system creates more spherical lesions. The proper combination of RF-system and electrode length allows to individually adapt the shape and volume of the generated coagulation necrosis to the target lesion.