Core-Shell in Liquid Chromatography: Application for Determining Sulphonamides in Feed and Meat Using Conventional Chromatographic Systems.

A C18 column packed with core-shell particles was used for the chromatographic separation of sulphonamides in feed and meat by a conventional high performance liquid chromatography system coupled with a diode array detector. Two analytical methods, already used in our laboratory, have been modified without any changes in the extraction and clean-up steps and in the liquid chromatography instrumentation. Chromatographic conditions applied on a traditional 5-µm column have been optimized on a column packed with 2.

Primary malignant fibrous histiocytoma of the duodenum.

Background/aim: We report on a case of primary malignant fibrous histiocytoma of the duodenum.

Methods: Report of a case and review of the literature on the occurrence of this tumor in the alimentary tract.

Results: The neoplasm was detected incidentally at the time of diagnostic workup for upper gastrointestinal bleeding.

[A computerized multivariate analysis in the assessment of the prognosis of breast cancer after surgical excision].

Background: The prognostic parameters most universally accepted as indicative for the assessment of 5 and 10 year survival in breast cancer are considered.

Methods: The aims of this study were to elucidate the relationships among these parameters and to determine the specific interrelations of these prognostic factors. These parameters (age, grading, tumour size, lymphatic and vascular invasion, necrosis, lymph node status and number of nodes positive) are analysed by univariate and multivariate analysis on a series of 75 patients.

Acute pseudo-obstruction of the colon (Ogilvie's syndrome): advances in management.

The management of the patients with acute pseudo-obstruction of the colon (APOC) still represents a matter of debate. To better evaluate and compare the effectiveness of various therapeutic approaches in the management of APOC 29 patients were considered. These were included according to three consecutive periods in: group A (1977-1982) concerning patients who underwent medical treatment alone (n = 8) or endoscopic (n = 4) and surgical (n = 1) decompression; group B (1983-1990) in which the management was based on simple endoscopic decompression (n = 10); group C (1991-1995) including patients in whom placement, under fluoroscopic control, of a tube in the cecum following endoscopic decompression was provided (n = 6).

[Surgical treatment of pancreatic pseudocysts].

The Authors report their experience of 62 consecutive patients with pancreatic pseudocysts observed within the period 1973-1993. Spontaneous resolution of the pseudocyst occurred in 16 cases. Forty-five patients were surgically treated (31 post-necrotic cysts, 5 post-traumatic cysts and 9 retention cysts); operations included internal drainage in 32 (cystojejunostomy in 13, cystogastrostomy in 18 and cystoduodenostomy in one), external drainage in 8 and pancreatic resection in 5 patients.

[The histopathological and microbiological aspects in a model of acute acalculous cholecystitis: an experimental study].

The early stages of acute acalculous cholecystitis (ACC) have been difficult to investigate due to the animal models developed and utilized over the past years. A new model of animal AAC induced by intra-abdominal sepsis is presented. Under general anesthesia 35 guinea pigs underwent laparotomy.

Multivariate analysis for predicting the presence of bacteria in bile in patients with acute cholecystitis.

Objective: to find out whether the presence of bacteria in bile could be predicted accurately from preoperative data in patients with acute cholecystitis.

Design: Prospective open study.

Setting: University hospital.

[Intraoperative colonoscopy: current indications].

From January 1987 to December 1991, 37 patients underwent intraoperative colonoscopy for several indications; these latter can be summarized in the need to define the site or extension of the lesions treated or detected by endoscopy before surgery. This procedure is therefore necessary in those cases in whom intraoperative endoscopy is likely to be useful in planning the surgical treatment. The use of intraoperative colonoscopy should be however considered complementary, but not substitutive, of the preoperative colonoscopy.