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L M A Schreurs,
A C J W Janssens,
H Groen,
P Fockens, H M van Dullemen,
M I van Berge Henegouwen,
G W Sloof,
J Pruim,
J J B van Lanschot,
E W Steyerberg,
J Th M Plukker
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ABSTRACT: BACKGROUND: The separate value of endoscopic ultrasonography (EUS), multidetector computed tomography (CT), and (18)F-fluorodeoxyglucose positron emission tomography (FDG-PET) in the optimal sequence in staging esophageal cancer has not been investigated adequately. METHODS: The staging records of 216 consecutive operable patients with esophageal cancer were reviewed blindly. Different staging strategies were analyzed, and the likelihood ratio (LR) of each module was calculated conditionally on individual patient characteristics. A logistic regression approach was used to determine the most favorable staging strategy. RESULTS: Initial EUS results were not significantly related to the LRs of initial CT and FDG-PET results. The positive LR (LR+) of EUS-fine-needle aspiration (FNA) was 4, irrespective of CT and FDG-PET outcomes. The LR+ of FDG-PET varied from 13 (negative CT) to 6 (positive CT). The LR+ of CT ranged from 3-4 (negative FDG-PET) to 2-3 (positive FDG-PET). Age, histology, and tumor length had no significant impact on the LRs of the three diagnostic tests. CONCLUSIONS: This study argues in favor of PET/CT rather than EUS as a predictor of curative resectability in esophageal cancer. EUS does not correspond with either CT or FDG-PET. LRs of FDG-PET were substantially different between subgroups of negative and positive CT results and vice versa.
Annals of Surgical Oncology 05/2011; · 4.17 Impact Factor
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ABSTRACT: In the assessment of patients with a clinical suspicion of malignant pancreatic disease, computed tomography (CT) findings are sometimes negative or inconclusive.
To determine whether endoscopic ultrasonography (EUS) with or without fine needle aspiration (EUS÷FNA) was conclusive in patients with a clinical suspicion of pancreatic malignancy, in whom CT scan was negative or inconclusive.
Retrospective case series in a tertiary referral centre. From February 2006 to December 2007, EUS÷FNA was performed in all patients suspected of having malignant pancreatic disease with negative or inconclusive CT findings. Main outcome measurement was the diagnostic yield of EUS in these patients.
34 patients had a negative (n=11) or inconclusive (n=23) CT scan. EUS÷FNA established a correct diagnosis in 30÷34 cases (88%). Malignancy was diagnosed in 19÷34 patients and nonmalignant disease in 8÷34 cases. In 3÷34 patients no lesions were found and no malignant disease developed during follow-up (mean=728 days). EUS÷FNA was inconclusive in 4÷34 patients.
In patients with a clinical suspicion of pancreatic malignancy with negative or inconclusive CT findings, EUS÷FNA was able to establish a diagnosis in 88% of cases. EUS should therefore be considered a diagnostic modality in this complex group of patients.
The Netherlands Journal of Medicine 09/2010; 68(9):360-4. · 2.07 Impact Factor
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ABSTRACT: In this feasibility study we investigated whether magnetic resonance imaging (MRI) with ultrasmall superparamagnetic iron oxide (USPIO) can be used to identify regional and distant lymph nodes, including mediastinal and celiac lymph node metastases in patients with oesophageal cancer.
Ten patients with a potentially curative resectable cancer of the oesophagus were eligible for this study. All patients included in the study had positive lymph nodes on conventional staging (including endoscopic ultrasound, computed tomography and fluorodeoxyglucose-positron emission tomography). Nine patients underwent MRI + USPIO before surgery. Results were restricted to those patients who had both MRI + USPIO and histological examination. Results were compared with conventional staging and histopathologic findings.
One patient was excluded due to expired study time. Five out of 9 patients underwent an exploration; in 1 patient prior to surgery MRI + USPIO diagnosed liver metastases and in 3 patients an oesophageal resection was performed. USPIO uptake in mediastinal lymph nodes was seen in 6 out of 9 patients; in 3 patients non-malignant nodes were not visible. In total, 9 lymph node stations (of 6 patients) were separately analysed; 7 lymph node stations were assessed as positive (N1) on MRI+USPIO compared with 9 by conventional staging. According to histology findings, there was one false-positive and one false-negative result in MRI + USPIO. Also, conventional staging modalities had one false-positive and one false-negative result. MRI + USPIO had surplus value in one patient. Not all lymph node stations could be compared due to unforeseen explorations. No adverse effects occurred after USPIO infusion.
MRI+USPIO identified the majority of mediastinal and celiac (suspect) lymph nodes in 9 patients with oesophageal cancer. MRI+USPIO could have an additional value in loco-regional staging; however, more supplementary research is needed.
Cancer Imaging 02/2009; 9:19-28. · 1.50 Impact Factor
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Endoscopy 08/2008; 40 Suppl 2:E165. · 5.21 Impact Factor
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ABSTRACT: To assess the prognostic importance of standardized uptake value (SUV) for 18F-fluorodeoxyglucose (FDG) at positron emission tomography (PET) and of EUS parameters, in esophageal cancer patients primarily treated by surgery.
Between October 2002 and August 2004 a prospective cohort study involved 125 patients, with histologically proven cancer of the esophagus, without evidence of distant metastases or locally irresectable disease based on extensive preoperative work-up, and fit to undergo major surgery. Follow-up was complete until October 2006, ensuring a minimal potential follow-up of 25 months.
The median SUV was 0.27 (interquartile range 0.13 - 0.45), and was used as cutoff value between high (n = 62) and low (n = 63) SUV. Patients with a high SUV had a significantly worse disease-specific survival compared with patients with a low SUV (P = 0.04). Tumor location (P = 0.005), EUS T stage (P < 0.001), EUS N stage (P = 0.006) and clinical stage (P < 0.006) were also associated with disease-specific survival. However, in multivariate analysis only EUS T stage appeared to be of independent prognostic significance (P = 0.007).
In esophageal cancer patients, EUS T stage, EUS N stage, location and SUV of the primary tumor are pretreatment factors that are associated with disease-specific survival. However, only EUS T stage is an independent prognostic factor.
Endoscopy 06/2008; 40(6):464-71. · 5.21 Impact Factor
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ABSTRACT: --Cholangiocarcinoma is a rare malignancy originating from the biliary epithelium. The disease can arise anywhere in the biliary tract: intrahepatic, perihilar or distal. The overall prognosis for cholangiocarcinoma is poor. --The treatment necessitates a multidisciplinary approach. --Radical resection of the extrahepatic bile ducts, usually in combination with concomitant partial liver resection, remains the only curative treatment. --Liver transplantation in combination with neoadjuvant chemoradiation therapy seems to be promising in a highly selected group of patients. --Palliative treatment should be targeted at adequate biliary drainage, preferably by stenting. --Radiotherapy and systemic chemotherapy are not standard treatment and should be applied in an experimental setting only. --New options such as photodynamic therapy and tyrosine kinase inhibitors are promising, but still experimental treatments.
Nederlands tijdschrift voor geneeskunde 06/2008; 152(18):1037-41.
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H L van Westreenen,
M Westerterp,
G W Sloof,
H Groen,
P M M Bossuyt,
P L Jager,
E F Comans, H M van Dullemen,
P Fockens,
J Stoker,
E J van der Jagt,
J J B van Lanschot,
J T M Plukker
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ABSTRACT: The detection of distant metastases in patients with oesophageal cancer may be improved with [(18)F]fluorodeoxyglucose positron emission tomography (FDG-PET), preventing unnecessary surgical explorations. The aim of this study was to assess the additional value of FDG-PET after a state-of-the-art preoperative staging protocol.
All patients in this prospective cohort study were staged with multidetector computed tomography, endoscopic ultrasonography and external ultrasonography of the neck, both combined with selective fine-needle aspiration cytology. Patients considered eligible for curative surgery after these investigations underwent FDG-PET.
FDG-PET revealed suspicious hot spots in 30 (15.1 per cent) of 199 patients. Metastases were confirmed in eight (4.0 per cent). In six of these, distant metastases were confirmed before surgery, but exploratory surgery was necessary for histological confirmation in the other two. All eight upstaged patients had clinical stage III-IV disease before FDG-PET (6.6 per cent of 122 with stage III-IV disease). In seven patients (3.5 per cent) hot spots appeared to be synchronous neoplasms, mainly colonic polyps. However, those in the remaining 15 (7.5 per cent) were false positive, leading to unnecessary additional investigations.
FDG-PET improves the selection of patients with oesophageal cancer for potentially curative surgery, especially in stages III-IV. However, the diagnostic benefit is limited after state-of-the-art staging, and so broad implementation in daily clinical practice is questionable.
British Journal of Surgery 01/2008; 94(12):1515-20. · 4.61 Impact Factor
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ABSTRACT: Inflammatory bowel disease (IBD) comprising ulcerative colitis (UC) and Crohn's disease (CD) is multigenic disorder. Tremendous progress has been achieved in unravelling the genetic background of IBD. It has led to the discovery of mutations in NOD2 associated with ileal CD and numerous other genes have been found to be associated with IBD susceptibility.
A review of the literature on the genetic background of IBD was performed.
It is only partially understood how mutations in NOD2 lead to CD. Mouse models, in vitro data and studies in humans offer conflicting data as regards whether there is a loss or gain of function of NOD2 in CD. Several additional genes have been identified of which only a few are currently being recognized as potential disease causing or disease modifying genes. Promising candidate genes include TLR4, MDR1, NOD1 (CARD4), DLG5 as well as the IBD5 locus including SLC22A4/5.
Although genetic research has not yet led to a better prediction of the disease course or patient selection for medical therapy, remarkable progress has been made in the understanding of the pathogenesis of IBD. For future genetic research, accurate phenotyping of patients is very important and large population-based cohorts are needed. Eventually, genetic research may be able to classify different disease phenotypes on a more detailed molecular basis and may provide important contributions in the development of new therapeutic approaches.
Alimentary Pharmacology & Therapeutics 01/2008; 26 Suppl 2:57-65. · 3.77 Impact Factor
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ABSTRACT: We aim to determine the effect of splenectomy on clinical outcome in patients with cancer of the distal esophagus and gastro-esophageal junction (GEJ) after a curative intended resection. From January 1991 to July 2004, 210 patients underwent a potentially curative gastroesophageal resection with an extended nodal dissection. The study group was divided into: group I with splenectomy, consisting of 66 patients (31.4%), and group II without splenectomy, of 144 patients. Splenectomy was performed for oncological reasons. Medical records were reviewed retrospectively. Postoperative complications occurred in 27 patients (40.9%) in group I and in 68 patients (47.2%) in group II (P = 0.4). The overall mortality was not significantly different between both groups (P = 0.7). There was a higher administration of red blood cells during surgery (P < or = 0.001), increased operating room (OR) time (P < or = 0.001) and longer intensive care unit (ICU) stay (P = 0.01) in group I. Independent prognostic factors for survival were outcome of surgery, nodal metastases, gender, complications and ICU stay. Sepsis was a strong prognostic factor among the complications. The 1 and 2-year survival was significantly higher in group II; 75% and 67% (P = 0.032) compared to 69% and 56% (P = 0.017) in group I, respectively. However, the 5-year survival was not different in both groups (29% in group I and 60% in group II, P = 0.191). Splenectomy had no marked effect on mortality and morbidity after curative resection of esophageal cancer. Splenectomy had a significant increase in blood transfusions with prolonged OR time and ICU stay and decreased short-term survival.
Diseases of the Esophagus 01/2008; 21(4):334-9. · 1.81 Impact Factor
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ABSTRACT: Spontaneous pneumomediastinum has been infrequently reported as a complication of diabetic ketoacidosis. Evidence-based guidelines are currently not available to help in choosing the best diagnostic approach.
We conducted a systematic review of the literature and looked for diagnostic clues that might indicate the need for a work-up to rule out oesophageal perforation.
In all 56 published cases of spontaneous pneumomediastinum associated with diabetic ketoacidosis, the condition was self-limiting. We report one additional case of a 31-year-old female who presented with a spontaneous pneumomediastinum and also epidural pneumatosis, complicating diabetic ketoacidosis.
Important pathology, such as oesophageal rupture, was not detected in any of the reported cases, and we suggest a restrictive diagnostic work-up.
The Netherlands Journal of Medicine 12/2007; 65(10):368-71. · 2.07 Impact Factor
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L E Oostenbrug,
I M Nolte,
E Oosterom,
G van der Steege,
G J te Meerman, H M van Dullemen,
J P H Drenth,
D J de Jong,
K van der Linde,
P L M Jansen,
J H Kleibeuker
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ABSTRACT: Three major polymorphisms of the Caspase-Activation Recruitment Domain containing protein 15 gene have been described to be associated with Crohn's disease. Genotype-phenotype studies reported in literature provide conflicting data on disease localisation and behaviour. We investigated the relation of Caspase-Activation Recruitment Domain containing protein 15 with inflammatory bowel disease and Crohn's disease phenotypic characteristics in a large Dutch cohort and performed a pooled analysis on inflammatory bowel disease patients and Crohn's disease phenotypic characteristics reported in association studies.
We genotyped 781 cases and 315 controls for the R702W, G908R and 1007fsinsC variants and for six microsatellite markers in and close to Caspase-Activation Recruitment Domain containing protein 15. In the pooled analysis data of 7201 inflammatory bowel disease patients and 3720 controls from 20 studies were included.
Association was found for Crohn's disease with R702W and 1007fsinsC, including several disease characteristics, and not for ulcerative colitis. In the pooled analysis all three common Caspase-Activation Recruitment Domain containing protein 15 variants showed strong association with Crohn's disease (p<0.00001; odds ratio varying from 3.0 for single heterozygotes to 14.7 for compound heterozygotes) and not with ulcerative colitis. Phenotype analysis showed association with small bowel involvement, stricturing and penetrating disease.
Caspase-Activation Recruitment Domain containing protein 15 is associated with Crohn's disease and not with ulcerative colitis. All three common Crohn's disease-associated variants are associated with small bowel involvement, the G908R and 1007fsinsC alleles also being associated with a complicated disease course.
Digestive and Liver Disease 11/2006; 38(11):834-45. · 3.05 Impact Factor
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ABSTRACT: Treatment strategies for Crohn's disease are targeted toward lifelong management. Optimization of outpatient care is mandatory, because of many clinics facing capacity issues, and, along with routine follow-up of patients with inflammatory bowel disease, is putting increasing pressure on outpatient clinics. Recent studies demonstrate clearly that alternative management strategies are feasible and effective with a high rate of patient satisfaction. It is recommended that future research evaluates the way in which medical care is provided and explores the long-term effects of novel management strategies in IBD. This approach can then be extrapolated to other chronic conditions.
Scandinavian journal of gastroenterology. Supplement 06/2006;
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ABSTRACT: Colorectal cancer (CRC) is still a disease with a high incidence and mortality. Prevention of (pre-) cancerous lesions of CRC by endoscopic screening is promising, but costs are high and identification of high-risk populations is difficult. Since screening both average-risk and high-risk populations for CRC has its logistic and financial limitations, new primary prevention strategies are sought. Substantial evidence has shown that non-steroidal anti-inflammatory drugs (NSAIDs) and selective COX-2 inhibitors can reduce the incidence and mortality of CRC. However, long-term use of NSAIDs is associated with substantial gastrointestinal toxicity and may cause an exacerbation in IBD patients. Selective COX-2 inhibitors, with a better toxicity profile and no flare-up in IBD disease activity, are therefore attractive candidates for prevention. Chemoprevention with low-dose aspirin can be considered for individuals carrying a high risk for CRC. Folate supplementation is beneficial to the folate-depleted patients, since significant risk reductions for CRC are reported. Moreover, it might be applicable to the general population because it is safe, inexpensive and protects against vascular diseases. In line with drugs beneficial for multiple disease entities, statins have recently been proposed to reduce CRC risk. Ursodeoxycholic acid has been shown to decrease the incidence of colonic dysplasia in patients with ulcerative colitis and PSC and possibly reduces recurrence rates of polyps in general. Unfortunately, prospective randomized trials, in both high-risk and general population, are not available and the evidence is still controversial. Furthermore, cumulative epidemiological and observational data suggest the potential role of hormones as a chemoprotective agent. An increase in CRC in females with an early menopause, as well as a decrease of CRC in women with hormone replacement therapy justify further research into this issue. In IBD patients, both the severity and duration of the inflammation are the most evident risk factors for the development of dysplasia and subsequently cancer. Remission of inflammation, clinically, endoscopically and histologically, in IBD is the major goal. Long-term use of 5-aminosalicylates (5-ASA) has been shown to decrease the incidence of CRC and may hold the best promise as a chemoprotective agent in IBD. In parallel with primary prevention strategies in vascular medicine, the aim might be to postpone adenoma formation, for instance for 10 years, thereby achieving a significant risk reduction for CRC. In current practice, folate supplementation along with low-dose aspirin use in high-risk patients may be most attractive candidates, while future studies will have to clarify the role of these and other chemoprotective agents.
Scandinavian journal of gastroenterology. Supplement 06/2006;
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ABSTRACT: Intestinal transplantation for intestinal failure is no longer an experimental procedure, but an accepted treatment for patients who fail total parenteral nutrition (TPN) therapy. Early referral for evaluation for small bowel transplantation has to be considered in patients with permanent intestinal failure who have occlusion of more than two major veins, frequent line-related septic episodes, impairment of liver function or an unacceptable quality of life. With the increased experience in post-transplant patient care and newer forms of induction (thymoglobulin, IL-2 receptor antagonists) and maintenance (tacrolimus) therapies the 1-year graft survival has increased to 65% for isolated and to 59% for liver/small bowel transplantation, and is further improving. Rejection, bacterial, fungal and viral (CMV, EBV) infection, post-transplant lymphoproliferative disease (PTLD) and graft versus host disease (GvHD) are the most common complications after intestinal transplantation. Although most of the long-term survivors are TPN-independent and have a good quality of life, the risk of the procedure and long-term adverse effects of immunosuppressive medication limits small bowel, or liver/small bowel transplantation only to patients with severe complications of TPN therapy.
Scandinavian journal of gastroenterology. Supplement 06/2006;
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ABSTRACT: 10-15% of patients with ulcerative colitis experience a severe episode of colonic inflammation that does not respond to mesalazine and oral corticosteroids. These patients require hospitalisation and treatment with intravenous corticosteroids. However, 25% of these patients do not respond to treatment. In these cases, intravenous cyclosporin is effective. Infliximab, an antibody against tumour necrosis factor alpha, is also beneficial. With these new treatment options, the colectomy rate in the acute phase has declined to about 35%. Other new therapies are under investigation in phase 2 and 3 trials. Surgery remains an important treatment option. Patients, gastroenterologists and surgeons should be involved in the clinical decision-making process.
Nederlands tijdschrift voor geneeskunde 02/2006; 150(1):12-7.
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ABSTRACT: The commensal intestinal microflora has important metabolic and perhaps also immune modulatory functions. Evidence has accumulated that the microflora plays a role in the pathogenesis of inflammatory bowel disease. Therefore, there is a growing interest in the intestinal microflora and its interaction with the host. Presumably, this interaction takes place at the mucus layer. In this study, we investigated the microflora that is present at the mucus layer and addressed the following questions. Does a specific mucus-adherent microflora exist? Is there direct contact between commensal bacteria and epithelial cells?
Snap-frozen biopsies were taken of 5 colon regions and of the terminal ileum in 9 subjects with a normal colon. Fecal samples were also collected. Bacteria were detected in cryosections with fluorescent in situ hybridization (FISH) with 16S ribosomal (r)RNA-targeted probes for all bacteria and specific probes for the major representatives of anaerobic microflora (bifidobacteria, Bacteroides, clostridia, atopobia) and aerobic microflora (Enterobacteriaceae, enterococci, streptococci, lactobacilli).
With this sensitive technique, bacteria were only observed at the luminal side of the intestinal mucus layer. Very few microcolonies were present at the mucus layer, and the composition of the bacterial microflora present in the feces was similar to that at the mucus layer of the terminal ileum and colon regions.
We did not observe direct contact between bacteria and epithelial cells. The equal distribution of bacterial species suggests that intestinal commensal bacteria live in suspension in the lumen and that there is no specific mucus-adherent microflora.
Inflammatory Bowel Diseases 11/2005; 11(10):865-71. · 4.86 Impact Factor
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MD Laurens A van der Waaij PhD,
H J. M. Harmsen PhD,
M Madjipour,
F G. M. Kroese PhD,
M Zwiers,
PhD H M van Dullemen MD,
PhD N K de Boer MD,
G W Welling PhD,
PhD P L. M. Jansen MD,
Laurens A van der Waaij,
H J. M. Harmsen,
F G. M. Kroese, H M van Dullemen,
N K de Boer,
G W Welling,
P L. M. Jansen
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ABSTRACT: Background:The commensal intestinal microflora has important metabolic and perhaps also immune modulatory functions. Evidence has accumulated that the microflora plays a role in the pathogenesis of inflammatory bowel disease. Therefore, there is a growing interest in the intestinal microflora and its interaction with the host. Presumably, this interaction takes place at the mucus layer. In this study, we investigated the microflora that is present at the mucus layer and addressed the following questions. Does a specific mucus-adherent microflora exist? Is there direct contact between commensal bacteria and epithelial cells?Methods:Snap-frozen biopsies were taken of 5 colon regions and of the terminal ileum in 9 subjects with a normal colon. Fecal samples were also collected. Bacteria were detected in cryosections with fluorescent in situ hybridization (FISH) with 16S ribosomal (r)RNA-targeted probes for all bacteria and specific probes for the major representatives of anaerobic microflora (bifidobacteria, Bacteroides, clostridia, atopobia) and aerobic microflora (Enterobacteriaceae, enterococci, streptococci, lactobacilli).Results:With this sensitive technique, bacteria were only observed at the luminal side of the intestinal mucus layer. Very few microcolonies were present at the mucus layer, and the composition of the bacterial microflora present in the feces was similar to that at the mucus layer of the terminal ileum and colon regions.Conclusions:We did not observe direct contact between bacteria and epithelial cells. The equal distribution of bacterial species suggests that intestinal commensal bacteria live in suspension in the lumen and that there is no specific mucus-adherent microflora.
Inflammatory Bowel Diseases 09/2005; 11(10):865 - 871. · 4.86 Impact Factor
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Alimentary Pharmacology & Therapeutics 04/2005; 21(6):792. · 3.77 Impact Factor
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ABSTRACT: Small bowel transplantation for intestinal failure is no longer an experimental procedure, but an accepted treatment for patients where total parenteral nutrition (TPN) therapy for intestinal failure is unsuccessful. Early referral for screening for small bowel transplantation should be considered in patients with permanent intestinal failure who have occlusion of more than 2 major veins, frequent line-related septic episodes, impairment of liver function or an unacceptable quality of life. With the increased experience in post-transplant patient care and newer forms of induction (thymoglobulin, IL-2 receptor antagonists) and maintenance (tacrolimus) therapies, the 1-year graft survival has increased to 65% for isolated and to 59% for liver/small bowel transplantation and is further improving. Rejection, bacterial, fungal and viral (Cytomegalovirus, Epstein-Barr-virus) infections, post-transplant lymphoproliferative disease and graft versus host disease are the most common complications after intestinal transplantation. Although most of the long-term survivors are TPN-independent and have a good quality of life, the risk of the procedure and long-term adverse effects ofimmunosuppressive medication limits small bowel, or liver/small bowel transplantation only to patients with severe complications of TPN therapy.
Nederlands tijdschrift voor geneeskunde 03/2005; 149(8):391-8.
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ABSTRACT: Azathioprine is widely used in Crohn's disease. A major drawback is the occurrence of side-effects, especially acute pancreatitis. Acute pancreatitis is rarely seen when azathioprine is used for other diseases than Crohn's disease.
To survey side-effects of azathioprine after liver or renal transplantation, for systemic lupus erythematosis, Wegener's granulomatosis, autoimmune hepatitis, rheumatoid arthritis, ulcerative colitis or Crohn's disease.
A computerized search using the term 'azathioprine' or 'imuran' was performed on the Hospital Information System of the university hospital Groningen, resulting in 1564 patients matching our criteria.
Eleven of 224 patients with Crohn's disease experienced acute pancreatitis (4.9%) compared with two of 129 (1.5%) with autoimmune hepatitis, two of 388 (0.5%) after renal transplantation, one of 254 (0.4%) after liver transplantation. Acute pancreatitis was more prevalent in Crohn's disease compared with any other disease. Azathioprine-toxicity necessitating withdrawal occurred significantly (P < 0,05) more in rheumatoid arthritis (78 of 317), ulcerative colitis (20 of 94) and Crohn's disease (52 of 224) compared with systemic lupus erythematosis (five of 73), Wegener's granulomatosis (six of 85), autoimmune hepatitis (eight of 129), after liver transplantation (17 of 254) and after renal transplantation (22 of 388).
Acute pancreatitis is strongly associated with Crohn's disease and rarely occurs with other underlying conditions. Overall azathioprine-induced toxicity and the necessity of withdrawal is more common in inflammatory bowel disease and rheumatoid arthritis compared with other diseases.
Alimentary Pharmacology & Therapeutics 11/2004; 20(8):843-50. · 3.77 Impact Factor
