Effect of changing the lipid component of home parenteral nutrition in adults.

BACKGROUND: The effect of different lipid emulsions (LEs) within the parenteral nutrition (PN) regimen of adult home PN (HPN) patients is not clear. This study investigated the effect of changing adult HPN patients from a soybean oil based LE (Intralipid) to either a fish oil containing LE (providing n-3 fatty acids) (SMOFLipid) or an olive oil based LE (ClinOleic). METHODS: Thirty two adults receiving long-term HPN with Intralipid as the LE were transferred to receive either SMOFLipid (n = 13) or ClinOleic (n = 19) for 60 days. Liver function markers, cholesterol, triglycerides, a full profile of fatty acids, and several cytokines were measured at study entry and after 60 days. RESULTS: SMOFLipid did not affect liver function markers, blood lipids or plasma cytokines. ClinOleic lowered both gamma-glutamyltranspeptidase (P = 0.044) and interleukin-8 (P = 0.030) concentrations. Both LEs induced marked changes in the fatty acid profile of plasma. SMOFLipid resulted in significant decreases in the proportions of linoleic acid, several other n-6 fatty acids and the essential fatty acid (EFA) deficiency indicator mead acid and significant increases in the proportions of the n-3 fatty acids eicosapentaenoic acid and docosahexaenoic acid. ClinOleic resulted in significant decreases in the proportions of some saturated fatty acids, linoleic acid, several n-6 fatty acids, all n-3 fatty acids and mead acid and a significant increase in the proportion of oleic acid. The ratio of mead to arachidonic acid in plasma was not altered by either SMOFLipid or ClinOleic. No patient had a mead acid to arachidonic acid ratio of >0.2, the cut-off used to indicate EFA deficiency. CONCLUSION: Both SMOFLipid and ClinOleic significantly alter the fatty acid profile of plasma in adult HPN patients previously using Intralipid. Neither LE induces EFA deficiency in these patients. SMOFLipid did not alter liver function markers or inflammation. In contrast, ClinOleic decreased some, though not all, markers of liver function and inflammation. SMOFLipid and ClinOleic may both be considered for use in adult HPN patients.

The efficacy of alcohol-antibiotic lock therapy for treatment of catheter related bloodstream infections in patients receiving home parenteral nutrition.

UNLABELLED: In patients with chronic gastrointestinal tract failure, requiring access to the venous system, the subsequent catheter re-insertion are leading to large veins thrombosis impeding or preventing the insertion of another catheter and exposing patients to the risk of complications. Understanding the pathophysiology of catheter-related infections, enabled to use methods allowing to eradicate the source of infection without removal and replacement of central catheter with a new one. In our center, for many years we have been using an alternative method involving implementation of the alcohol-antibiotic lock in the treatment of infections. This method is based on the assumption that the destruction of biofilm with concentrated alcohol will enable antibiotic penetration and killing other microorganisms. Treatment with alcohol-antibiotic lock lasts from 8 to 10 days and involves filling the catheter with 96% alcohol followed by a solution of the antibiotic of high concentration. The aim of the study was to evaluate the efficacy of treatment of catheter-related bloodstream infections with two methods (catheter replacement with a new one and the alcohol-antibiotic lock therapy) in patients receiving home parenteral nutrition (HPN). MATERIAL AND METHODS: 428 HPN in the period from 1 January 2005 to 31 December 2010. Among which 240 (56%) of women with an average age of 56.5 ± 16 years and 188 (44%) of men with an average age of 54 ± 17 years. The indications to HPN were as follows: short bowel syndrome in 298 (70%) patients, multilevel obstruction of the gastrointestinal tract in 52 (12%), postoperative gastrointestinal fistulas in 48 (11.2%), malabsorption syndrome in 17 (4%), motility disorders in 6, cachexia in 4 and radiation enteritis in 3 patients. RESULTS: In 247 (57.5%) from 428 patients, no episode of catheter-related bloodstream infection was found, while 181 were diagnosed with 352 episodes of catheter-related bloodstream infections. In 40 (9.4%) from 428 patients, 168 (47.8%) episodes have been found - almost a half. The mean duration of treatment of patients receiving home parenteral nutrition, starting from the first episode of catheter-related bloodstream infection, in 48 patients treated with the lock was equal to 1053+748 days, and in 133 patients treated with catheter replacement was equal to 952+709 days (t-test p = 0.62). CONCLUSIONS: The survival time of patients treated with alcohol-antibiotic lock is the same as in patients treated with the catheter removal and insertion of the new one. The use of alcohol-antibiotic lock to treat catheter-related bloodstream infections in order to eradicate selected microorganisms that colonize the lumen and cause an infection, is as effective as catheter replacement with a new one.

A comparison of two methods of treatment for catheter-related bloodstream infections in patients on home parenteral nutrition.

BACKGROUND & AIMS: Home parenteral nutrition (HPN) enables patients who cannot eat normally to survive and function. Catheter-related bloodstream infections (CRBSIs) are the most dangerous complication, which may be fatal if left untreated or if treatment is delayed. For over 20 years CRBSIs were managed by catheter removal and implantation of a new one after completion of antibiotic treatment. However, frequent catheter replacements put the patient at risk of large vein thrombosis, which may render parenteral nutrition impossible. The management of CRBSIs evolved into antibiotic treatment without catheter removal. The effectiveness of this approach was, however, limited by the low penetration of the antibiotics into the biofilm. Filling catheters with concentrated ethanol destroys the biofilm and does not result in the emergence of drug resistance. The aim of our study was to assess the remote outcomes of CRBSI treatment using two approaches: antibiotic-ethanol lock therapy and catheter replacement. METHODS: We retrospectively analysed the treatment outcomes of CRBSI diagnosed and managed in HPN patients. During the analysed period, a total of 428 patients between 13 and 96 years of age were on HPN and a total of 181 of them suffered a total of 352 CRBSI episodes managed with one of the two approaches. RESULTS: We showed no significant differences between the two approaches in terms of survival likelihood or duration of catheter use after an episode of CRBSI caused by various bacterial species. CONCLUSION: The use of antibiotic-ethanol lock therapy in the management of CRBSI is equally effective as catheter replacement.

Folic acid enforces DNA methylation-mediated transcriptional silencing of PTEN, APC and RARbeta2 tumour suppressor genes in breast cancer.

Folate, one of the most studied dietary compounds, has recently become the main topic of debates on food fortification. Although low folate levels may be associated with increased risk of cancer development, simultaneously several reports indicate a detrimental effects mediated by high folate concentrations. Using the methylation sensitive restriction analysis (MSRA) and real-time RT-PCR we tested the effect of folic acid on DNA promoter methylation and expression of PTEN, APC and RARbeta2 tumour suppressor genes in MCF-7 and MDA-MB-231 breast cancer cell lines with different invasive capacity. The tested genes encode proteins involved in regulation of oncogenic intracellular signaling pathways. The results show that the increasing concentrations of folic acid lead to a dose-dependent down-regulation of tumour suppressor genes which may be linked to the increased DNA methylation detected within their promoter regions. The effects were more remarkable in non-invasive MCF-7 cells where we also observed 30% up-regulation of DNMT1 expression at the highest folate concentration used. Our findings show that caution need to be used when introducing folic acid supplementation since it may lead to cancer progression.