Optical characteristics of Nd:YAG optics and distortions at high power

The intensity profile and beam caustics of a fiber coupled high power Nd:YAG laser beam through a lens system are studied. The thermal lensing effect and its influence on the beam profile and focal position are discussed. Asymmetry of the intensity profile in planes above and below the focal plane is demonstrated. Also the influence of small pollutions on the protective window is explained. Three different methods are used to measure the occurrence\ud of thermal lensing and quantify these effects

Operatie ‘Gestructureerde Opleidingsafdeling’

De aangewakkerde aandacht voor patiëntveiligheid moge hopelijk leiden tot een betere bewaking van het zorgproces, maar de belangrijkste garantie op een veilige behandeling is een optimale opleiding tot arts en speRede, uitgesproken ter gelegenheid van het aanvaarden van het ambt van hoogleraar met de leeropdracht Chirurgie, in het bijzonder klinisch onderwijs aan het Erasmus MC, faculteit van de Erasmus Universiteit Rotterdam op 11 september 200

Treatment of Perforated Diverticulitis with Generalized Peritonitis: Past, Present, and Future

The supposed optimal treatment of perforated diverticulitis with generalized peritonitis has changed several times during the last century, but at present is still unclear. The first cases of complicated perforated diverticulitis of the colon were reported in the beginning of the twentieth century. At that time the first therapeutic guidelines were postulated in which an initial nonresectional procedure was provided to be the safest plan of management. After many years in which resection had become standard practice, today, one century later, again (laparoscopic) nonresectional surgery is presented as a safe and promising alternative in treatment of complicated perforated diverticulitis. The question rises what had happened to close the circle? This paper includes a historic summary of changing patterns in surgical strategies in perforated diverticulitis complicated by generalized peritonitis

Perforated peptic ulcer disease: A review of history and treatment

Background: In the last one hundred years much has been written on peptic ulcer disease and the treatment options for one of its most common complications: perforation. The reason for reviewing the literature was evaluating most common ideas on how to treat perforated peptic ulcers (PPU) in general, opinions on conservative treatment and surgical treatment and summarizing ideas about necessary pre-, per- and postoperative proceedings. Method: All relevant articles found by Medline, Ovid and PubMed search were used. Results: A hundred articles written between 1929 and 2009 were reviewed. Of these, 9 were about the history of treatment, 7 about conservative treatment, and 26 were about the surgical procedure of which 8 were addressing laparoscopic correction. Overall there is no consensus, but some advice is given. For conservative treatment there are only a few indications. Use of an omental patch is recommended, irrigation and drainage are not. Laparoscopic correction of PPU as well as for definitive ulcer surgery has many advantages. Conclusions: Surgery for PPU is still a subject of debate despite more than an era of published expertise, indicating the need for establishing guidelines. Copyrigh

Treatment of perforated diverticulitis with generalized peritonitis: Past, present, and future

Background: The supposed optimal treatment of perforated diverticulitis with generalized peritonitis has changed several times during the last century, but at present is still unclear. Methods/results: The first cases of complicated perforated diverticulitis of the colon were reported in the beginning of the twentieth century. At that time the first therapeutic guidelines were postulated in which an initial nonresectional procedure was provided to be the safest plan of management. After many years in which resection had become standard practice, today, one century later, again (laparoscopic) nonresectional surgery is presented as a safe and promising alternative in treatment of complicated perforated diverticulitis. The question rises what had happened to close the circle? Conclusions: This paper includes a historic summary of changing patterns in surgical strategies in perforated diverticulitis complicated by generalized peritonitis