20 research outputs found
The scientific basis of immunonutrition
No full textSubstrates with immune-modulating actions have been identified among both macro- and micronutrients. Currently, the modes of action of individual immune-modulating substrates, and their effects on clinical outcomes, are being examined. At present, some enteral formulas are available for the clinical setting which are enriched with selected immune-modulating nutrients. The purpose of the present paper is to review the scientific rationale of enteral immunonutrition. The major aspects considered are mucosal barrier structure and function, cellular defence function and local or systemic inflammatory response. It is notable that in critical illness the mucosal barrier and cellular defence are impaired and a reinforcement with enteral immunonutrition is desirable, while local or systemic inflammatory response should be down regulated by nutritional interventions. The results available from clinical trials are conflicting. Meta-analyses of recent trials show improvements such as reduced risk of infection, fewer days on a ventilator, and reduced length of intensive care unit and hospital stay. Thus, a grade A recommendation was proclaimed for the clinical use of enteral immune-modulating diets. Improvement in outcome was only seen when critical amounts of the immune-modulating formula were tolerated in patients classified as being malnourished. However, in other patients with severe sepsis, shock and organ failure, no benefit or even disadvantages from immunonutrition were reported. In such severe conditions we hypothesize that systemic inflammation might be undesirably intensified by arginine and unsaturated fatty acids, directly affecting cellular defence and inflammatory response. We therefore recommend that in patients suffering from systemic inflammatory response syndrome great caution should be exercised when immune-enhancing substrates are involved which may aggravate systemic inflammation.</jats:p
Antioxidant nutrients: a systematic review of trace elements and vitamins in the critically ill patient
No full textOBJECTIVE: Critical illness is associated with the generation of oxygen free radicals and low endogenous antioxidant capacity leading to a condition of oxidative stress. We investigated whether supplementing critically ill patients with antioxidants, trace elements, and vitamins improves their survival. METHODS: We searched four bibliographic databases from 1980 to 2003 and included studies that were randomized, reported clinically important endpoints in critically ill patients, and compared various trace elements and vitamins to placebo. RESULTS: Eleven articles met the inclusion criteria. When the results of all the trials were aggregated, overall antioxidants were associated with a significant reduction in mortality [Risk Ratio (RR) 0.65, 95% confidence intervals (CI) 0.44-0.97, p=0.03] but had no effect on infectious complications. Studies that utilized a single trace element were associated with a significant reduction in mortality [RR 0.52, 95% CI 0.27-0.98, p=0.04] whereas combined antioxidants had no effect. Studies using parenteral antioxidants were associated with a significant reduction in mortality [RR 0.56, 95% CI 0.34-0,92, p=0.02] whereas studies of enteral antioxidants were not. Selenium supplementation (alone and in combination with other antioxidants) may be associated with a reduction in mortality [RR 0.59, 95% CI 0.32-1.08, p=0.09] while nonselenium antioxidants had no effect on mortality. CONCLUSIONS: Trace elements and vitamins that support antioxidant function, particularly high-dose parenteral selenium either alone or in combination with other antioxidants, are safe and may be associated with a reduction in mortality in critically ill patients
Einfluß von Arachidonsäure auf Mikrohärnodynamik and Leukozytenädhirenz in Alveolarkapillaren während Endotoxinämie
No full text
Neonatologie/Pädiatrie – Leitlinie Parenterale Ernährung, Kapitel 13
No full textThere are special challenges in implementing parenteral nutrition (PN) in paediatric patients, which arises from the wide range of patients, ranging from extremely premature infants up to teenagers weighing up to and over 100 kg, and their varying substrate requirements. Age and maturity-related changes of the metabolism and fluid and nutrient requirements must be taken into consideration along with the clinical situation during which PN is applied. The indication, the procedure as well as the intake of fluid and substrates are very different to that known in PN-practice in adult patients, e.g. the fluid, nutrient and energy needs of premature infants and newborns per kg body weight are markedly higher than of older paediatric and adult patients. Premature infants <35 weeks of pregnancy and most sick term infants usually require full or partial PN. In neonates the actual amount of PN administered must be calculated (not estimated). Enteral nutrition should be gradually introduced and should replace PN as quickly as possible in order to minimise any side-effects from exposure to PN. Inadequate substrate intake in early infancy can cause long-term detrimental effects in terms of metabolic programming of the risk of illness in later life. If energy and nutrient demands in children and adolescents cannot be met through enteral nutrition, partial or total PN should be considered within 7 days or less depending on the nutritional state and clinical conditions.Eine besondere Herausforderung bei der Durchführung parenteraler Ernährung (PE) bei pädiatrischen Patienten ergibt sich aus der großen Spannbreite zwischen den Patienten, die von extrem unreifen Frühgeborenen bis hin zu Jugendlichen mit einem Körpergewicht von mehr als 100 kg reicht, und ihrem unterschiedlichen Substratbedarf. Dabei sind alters- und reifeabhängige Veränderungen des Stoffwechsels sowie des Flüssigkeits- und Nährstoffbedarfs zu berücksichtigen sowie auch die klinische Situation, in der eine PE eingesetzt wird. Das Vorgehen unterscheidet sich deshalb ganz erheblich von der PE-Praxis bei erwachsenen Patienten, z.B. ist der Flüssigkeits-, Nährstoff- und Energiebedarf von Früh- und Neugeborenen pro kg Körpergewicht höher als bei älteren pädiatrischen und bei erwachsenen Patienten. In der Regel benötigen alle Frühgeborenen <35. SSW und alle kranken Reifgeborenen während der Phase des allmählichen Aufbaus der enteralen Nahrungszufuhr eine vollständige oder partielle PE. Die Zufuhrmengen der PE bei Neonaten müssen berechnet (nicht geschätzt) werden. Der Anteil der PE sollte zur Minimierung von Nebenwirkungen sobald wie möglich durch Einführung einer enteralen Ernährung vermindert (teilparenterale Ernährung) und schließlich komplett durch enterale Ernährung abgelöst werden. Eine unangemessene Substratzufuhr im frühen Säuglingsalter kann langfristig nachteilige Auswirkungen im Sinne einer metabolischen Programmierung des Krankheitsrisikos im späteren Lebensalter haben. Wenn bei älteren Kindern und Jugendlichen dagegen der Energie- und Nährstoffbedarf eines Patienten im Vorschul- oder Schulalter durch eine enterale Nährstoffzufuhr nicht gedeckt werden kann, ist abhängig von Ernährungszustand und klinischen Umständen spätestens innerhalb von 7 Tagen eine partielle oder totale PE zu erwägen
Erhöhte Parameter der systemischen Inflammation korrelieren mit der erniedrigten Konzentration von Glutamin, Arginin und Citrullin im Plasma von Patienten mit soliden Tumoren unter Chemo- und Radiotherapie
No full textRandomised trial of glutamine and selenium supplemented parenteral nutrition for critically ill patients
No full textBackground: Mortality rates in the Intensive Care Unit and subsequent hospital mortality rates in the UK remain high. Infections in Intensive Care are associated with a 2–3 times increased risk of death. It is thought that under conditions of severe metabolic stress glutamine becomes "conditionally essential". Selenium is an essential trace element that has antioxidant and anti-inflammatory properties. Approximately 23% of patients in Intensive Care require parenteral nutrition and glutamine and selenium are either absent or present in low amounts. Both glutamine and selenium have the potential to influence the immune system through independent biochemical pathways. Systematic reviews suggest that supplementing parenteral nutrition in critical illness with glutamine or selenium may reduce infections and mortality. Pilot data has shown that more than 50% of participants developed infections, typically resistant organisms. We are powered to show definitively whether supplementation of PN with either glutamine or selenium is effective at reducing new infections in critically ill patients. Methods/design: 2 × 2 factorial, pragmatic, multicentre, double-blind, randomised controlled trial. The trial has an enrolment target of 500 patients. Inclusion criteria include: expected to be in critical care for at least 48 hours, aged 16 years or over, patients who require parenteral nutrition and are expected to have at least half their daily nutritional requirements given by that route. Allocation is to one of four iso-caloric, iso-nitrogenous groups: glutamine, selenium, both glutamine & selenium or no additional glutamine or selenium. Trial supplementation is given for up to seven days on the Intensive Care Unit and subsequent wards if practicable. The primary outcomes are episodes of infection in the 14 days after starting trial nutrition and mortality. Secondary outcomes include antibiotic usage, length of hospital stay, quality of life and cost-effectiveness. Discussion: To date more than 285 patients have been recruited to the trial from 10 sites in Scotland. Recruitment is due to finish in August 2008 with a further six months follow up. We expect to report the results of the trial in summer 2009. Trial registration: This trial is registered with the International Standard Randomised Controlled Trial Number system. ISRCTN87144826Not peer reviewedPublisher PD
