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  • 1
    ISSN: 1530-0358
    Keywords: Cancer, rectal, treatment ; Sphincter preservation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract PURPOSE: Surgical options for the treatment of rectal cancer may involve sphincter-sparing procedures (SSP) or abdominoperineal resection (APR). We sought to examine variations in the surgical treatment of rectal cancer for a large, well-defined patient population and specifically to determine if differences exist in management and survival based on hospital type and surgical caseload. METHODS: The Cancer Surveillance Program database for Los Angeles County was used to retrospectively retrieve data on all patients who underwent SSP or APR for rectal adenocarcinoma between 1988 and 1992. RESULTS: A total of 2,006 patients with adenocarcinoma of the rectum underwent SSP or APR during the study period. Overall, 55 percent underwent SSP, and the remaining 45 percent underwent APR. Use of SSP remained relatively constant for each year of the five-year period. Substantial variability was seen in the use of SSP at various hospital types. For localized disease, this varied from as low as 52 percent at teaching hospitals to as high as 78 percent at hospitals approved by the American College of Surgeons (P=0.067). To examine the role of caseload experience, hospitals were divided into those completing an average of five or fewer rectal cancer cases per year vs.those completing an average of more than five cases per year. For localized disease, hospitals with higher caseloads performed SSP in significantly more cases, 69 vs.63 percent (P=0.049). Survival was seen to be significantly improved for patients operated on at hospitals with higher caseloads, in cases of both localized and regional diseases (P〈0.001). CONCLUSION: Surgical choices in the treatment of rectal cancer may vary widely, even in a well-defined geographic region. Although the reasons for this variability are multifactorial, hospital environment and surgical caseload experience seem to have a significant role in the choice of surgical procedure and on survival.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 21 (1987), S. 194-206 
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Der Nobelpreis für Physik wurde 1986 je zur Hälfte dem Berliner Physiker Ernst Ruska für seinen bedeutenden Beitrag zur Entwicklung des Durchstrahlungs-Elektronenmikroskops und den Physikern Gerd Binnig und Heinrich Rohrer in Zürich für die Erfindung des Raster-Tunnelmikroskops zuerkannt. Die Auswahl der Preisträger verdeutlicht, welche Bedeutung Methoden der „Übermikroskopie“, mit denen eine weit höhere Auflösung [1] als mit der Licht-mikroskopie erreicht werden kann, inzwischen zukommt. Besonders mit Hilfe der Durchstrahlungs-Elektronenmikroskopie gelang es der Biologie und Medizin, den feineren Aufbau der Zelle kennenzulernen. Darüber hinaus stößt diese leistungsfähige Untersuchungsmethode bis in atomare Dimensionen vor und ist deshalb aus der Werkstoffkunde, der Mineralogie, der Physik und der Festkörperchemie nicht mehr wegzudenken.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
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