Carcinoma of the ampulla of vater

Summary Endoscopically placed biliary endoprostheses were used to treat obstructive jaundice in 71 patients with ampullary carcinoma. Successful placement of an endoprosthesis was achieved in 68 patients (95.8%). Bilirubin declined in 67 patients (98.5%). There was no procedure-related mortality. Twenty-two patients (31%) received further surgical therapy, and 47 received an endoprosthesis as their only therapeutic intervention. In the latter group, bilirubin normalized in 44 of 46 patients surviving longer than 30 days (95.7%). Mean survival was 466 days (median 410, range 23-1515), which compares favorably with surgical palliation. Complications mainly involved clogging of the endoprosthesis, which was easily treated endoscopically and, more significantly, duodenal stenoses secondary to continued tumor growth in almost 25% of the patients. Although endoscopic drainage is a safe and effective method of relieving biliary obstruction in patients with ampullary carcinoma, we feel it should be reserved for poor surgical candidates and for those patients with a limited life expectancy due to metastatic disease.     

ABO compatibility can influence the results of platelet transfusion. Results of a randomized trial

Sixty consecutive patients with untreated acute leukemia alternately received either ABO-matched or ABO-mismatched random-donor platelet transfusions prepared from pooled platelet concentrate stored for 1 to 3 days. Patients were assigned randomly to receive matched or mismatched platelets as their first transfusion, and the first four transfusions were analyzed. In 40 evaluable patients, there was no significant difference (paired t test) between the 10-minute posttransfusion corrected count increments (CCI) of the initial transfusions of matched and mismatched platelets. In contrast, the second matched transfusion was significantly better than the second mismatched transfusion. This effect of ABO compatibility was particularly pronounced in a subset of patients. Six patients in whom mismatched transfusions were consistently inferior to matched transfusions had either a significant increase in anti-A or -B isoagglutinin titers following the first transfusion or elevated titers before or at the conclusion of the study. Conversely, in five patients in whom there was no apparent effect of ABO mismatching, only one had an increase in isoagglutinin titer. Platelet survival was not altered as the ratio of 18-hour to 10-minute posttransfusion CCl was 0.6 for both matched and mismatched platelet transfusions. These data demonstrate that ABO compatibility can affect the results of random-donor platelet transfusions and that patients who experience poor increments from ABO-mismatched platelets may benefit from a trial of ABO-compatible platelets before the initiation of HLA-matched platelet transfusion.     

Studies on the mechanism of bacterial resistance to complement-mediated killing. II. C8 and C9 release C5b67 from the surface of salmonella minnesota S218 because the terminal complex does not insert into the bacterial outer membrane

The mechanism for consumption of terminal complement components and release of bound components from the surface of serum-resistant salmonella minnesota S218 was studied. Consumption of C8 and C9 by S218 occurred through interaction with C5b67 on the bacterial surface because C8 and C9 were consumed when added to S218 organisms previously incubated in C8-deficient serum and washed to remove all C5b67 on the bacterial surface because C8 and C9 were consumed when added to S218 organisms previously incubated in C8- deficient serum and washed to remove al but cell bound C5b67. Rapid release of (125)I C5 and (125)I C7 from the membrane of S218 was dependent on binding of C8 because (125)I C5 and (125)I C7 deposition in C8D serum was stable and was twofold higher in C8D than in PNHA, and addition of purified C8 or C8 and C9 to S218 previously incubated in C8D serum caused rapid release of (125)I C5 and (125)I C7 from the organism. Analysis by sucrose density gradient ultracentrifugation of the fluid phase from the reaction of S218 and 10 percent PNHS revealed a peak consistent with SC5b-9, in which the C9:C7 ratio was 3.3:1, but the NaDOC extracted bound C5b-9 complex sedimented as a broad peak with C9:C7 of less than 1.2:1. Progressive elution of C5b67 and C5b-9 from S218 but not serum-sensitive S. minnesota Re595 was observed with incubation in buffers of increasing ionic strength. Greater than 90 percent of the bound counts of (125)I C5 or (125)I C9 were released from S218 by incubation in 0.1 percent trypsin, but only 57 percent of (125)I C9 were released by treatment of Re595 with trypsin. These results are consistent with the concept that C5b-9 forms on the surface of the serum-sensitive S. minnesota S218 in normal human serum, but the formed complex is released and is not bactericidal for S218 because it fails to insert into hydrophobic outer membrane domains.     

Management in peptic ulcer hemorrhage: a Dutch national inquiry

BACKGROUND AND STUDY AIMS: There is no consensus as to what endoscopic hemostatic therapy and pharmacotherapy should be used in peptic ulcer hemorrhage (PUH). We conducted a mail survey to investigate current management of ulcer hemorrhage in the Netherlands. METHODS: A questionnaire was sent to gastroenterologists or, if not present, to internists, performing endoscopies, in every hospital in the Netherlands (n = 123). Endoscopic hemostatic therapy, pharmacotherapy, endoscopic reintervention, and management of Helicobacter pylori were evaluated. RESULTS: 90/123 (73%) questionnaires were returned. Endoscopic hemostatic therapy is given in ulcers classified as Forrest Ia, Ib, IIa, IIb, and IIc by, respectively, 89%, 93%, 83%, 47%, and 19% of respondents. Gastroenterologists perform endoscopic therapy more often in Forrest Ib (P=0.03), IIa (P=0.002), and IIb (P=0.001) ulcers when compared with internists. Endoscopic injection therapy is used by 93% of respondents as first modality. Epinephrine combined with polidocanol is most commonly used (60%). Pharmacotherapy is given by 97%. A total of 71% use proton pump inhibitors (PPIs), and 26% use H2-receptor antagonists (H2RAs), both mainly initially given intravenously. In case of suspected rebleeding, endoscopic reintervention is performed by 76%, including a significantly greater percentage of gastroenterologists (89% of gastroenterologists vs. 60% of internists, P=0.005), whereas the others refer the patient directly for surgery. Almost all respondents investigate for H. pylori. Eradication is confirmed by only 64% (80% of gastroenterologists vs. 50% of internists, P=0.004). CONCLUSIONS: There are important differences in management of peptic ulcer hemorrhage between gastroenterologists and internists in the Netherlands. Management is only partly in accordance with evidence-based medicine.     

Analysis of helper activity on pokeweed mitogen- and interleukin 2-driven immunoglobulin synthesis by neoplastic T4+ cells.

The neoplastic T cells of a series of seven patients with chronic T-cell neoplasia were tested for helper activity on pokeweed mitogen (PWM)-induced and interleukin 2 (IL-2)-induced Ig synthesis. The neoplastic T cells of all patients had a T3+4+8-11+I1- phenotype but differed in expression of the 3A1 antigen. The neoplastic T cells of three patients had helper activity on both PWM- and IL-2-driven Ig synthesis, and in addition produced IL-2 in response to PWM stimulation. Two of these patients had hypergammaglobulinemia. In contrast, the neoplastic T cells in the remaining four patients did not produce IL-2 and did not support PWM-driven Ig synthesis. The T4+ cells of these four patients, however, provided excellent helper activity on IL-2-driven Ig synthesis. These findings emphasize the role of IL-2 in T cell-dependent Ig synthesis and clearly show that IL-2 production is required for helper activity in the PWM-driven system. It is concluded that the combined use of PWM- and IL-2-driven Ig synthesis systems allows separate analysis of IL-2 production and T-helper activity in health and disease.     

Differentiation of malignant and benign proximal bile duct strictures： The diagnostic dilemma

AIM： To identify the criteria for the differentiation of hilar cholangiocarcinoma （HCCA） from benign strictures. METHODS： A total of 68 patients underwent resection of lesions suspicious for HCCA between 1998 and 2006. The results of laboratory investigations, imaging studies and brush cytology were collected. These findings were analyzed to obtain the final diagnosis. RESULTS： Histological examination of the resected specimens confirmed HCCA in 58 patients （85%, group Ⅰ） whereas 10 patients （15%, group Ⅱ） were diagnosed to have benign strictures. The most common presenting symptom was obstructive jaundice in 77% patients （79% group vs 60% group Ⅰ, P = 0.23）. Laboratory findings showed greater elevation of transaminase levels in group Ⅰ compared to group Ⅱ. The various imaging modalities showed vascular involvement exclusively in the malignant group （36%,P 〈 0.05）. Brush cytology was positive for malignant cells in only 50% patients in group Ⅰ whereas none in group Ⅱshowed malignant cells. CONCLUSION： Despite improvements in imaging techniques, 10 patients （15%） with a presumptive diagnosis of HCCA were ultimately found to have benign strictures. Except for vascular involvement which was associated significantly with malignancy, there were no conclusive features of malignancy on regular imaging modalities. This uncertainty should be taken into account when patients with a suspicious lesion at the liver hilum are considered for resection.     

幽门螺杆菌感染处理的当前观念——MaastrichtⅢ共识报告

名词缩写 欧洲幽门螺杆菌研究小组：European Helicobacter Study Group，EHSG 胃食管反流病：gastro-esophageal reflux disease，GERD