glutamine and arginine- benefits and contraindications in the clinical setting
TRANSCRIPT
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Glutamine & Arginine:
Benefits and Contraindications
in the Clinical Setting
Amanda Biondo, R.D.
Blake Bartholomew, M.S., R.D.
Brianna Carroll, Dietetic Intern
Objectives
• To understand what glutamine is and its function in
the body
• To understand glutamine’s beneficial effects in
different disease states
• To identify contraindications for glutamine
supplementation
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Disclaimers
We have nothing to disclaim
What is Glutamine?
• Amino acid
• Considered “conditionally essential”
• Accounts for 20% of amino acid pool in the body
• In human skeletal muscle, glutamine account for up
to 60% of the total amino acid pool
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Roles
• Vital fuel for highly proliferating cells such as
fibroblasts, reticuloendothelial cells, malignant cells,
gut epithelial cells
• Aids in removal of excess ammonia
• Immune system modulation
• Regulator of glycogen synthesis
Depletion
• Plasma glutamine is currently the best indicator of glutamine depletion
• Following operation, injury, systemic infection, other severe illnesses and exercise there is a rapid fall in the concentration of glutamine in the circulation and cellular pools
• Glutamine deficiency results in an accelerated net breakdown of muscle protein, thus contributing to muscle wasting and negative nitrogen balance
• Associated with atrophy of intestinal mucosa, impairment of immune function and decreased protein synthesis
• Low plasma and muscle concentrations of glutamine in critical care patients are correlated with an increase in mortality
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Simulation of the Additional Mortality
Prediction from an out of Range Plasma
Glutamine Concentration at ICU Admittance
Adopted from Wernerman et al.
Recommended Intake
• Healthy individuals produce 50-80g/day
• Glutamine doses in trials: ~0.3g/kg/day (~0.9g/hour for
70kg patient)
• Critically ill: 0.3-0.5g/kg/day
• However, some studies have shown that providing an
adequate amount of protein will allow the body to
produce glutamine at a faster rate than it can be infused
• Standard enteral formulas contain 2-4g/L, which is
insufficient to normalize plasma glutamine concentration
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Food Sources of Glutamine
• Meat & poultry
• Fish & seafood
• Organ meats
• Dairy
• Eggs
• Cabbage
• Nuts
• Beans & legumes
• Beets, spinach & parsley
Clinical Significance
• Glutamine has been supplemented in cases of:
• Wound healing
• Burns
• GI Disorders
• Cancer
• HIV/AIDS
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Arginine
• “Conditionally” essential amino acid
• Demonstrated importance in immune response and wound healing
• Plasma levels are usually dependent on dietary intake
• Used to synthesize nitric oxide, which affects respiratory, cardiovascular, renal and immunological function
• Enhances lymphocyte function and may prove useful in treating inflammatory diseases and AIDS
Food Sources of Arginine
• Red meat
• Seafood
• Eggs
• Nuts
• Spinach & lentils
• Whole grains
• Soy
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Wound Healing
Roles in Wound Healing
• Glutamine
• Main contributor of nitrogen for collagen formation
• Factor in immune response
• Reduction of inflammation and oxidative stress
• Arginine
• Stimulates insulin secretion
• Promotes amino acid transport into cells
• Enhances collagen production and protein synthesis
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Factors of Wound Healing Studied in Regards
to Glutamine and Arginine Supplementation
• Rate of recovery
• Tissue Health
• Exudate Volume
• Presence of infection
Wound Healing
• Research has been conducted in many areas of
wound healing, including pressure ulcers, burns,
post surgical/trauma wounds.
• Animal and human trials have been conducted to
evaluate the efficacy of glutamine and arginine
supplementation for the promotion of wound
healing.
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Burns
• “75% of burn related deaths are caused by infectious
complications, even after surgical intervention and
antibiotic therapy”
• Patients with 20-60% burn surface area
• Supplementation with 0.5gm/kg/day of glutamine
• Incidence of positive blood culture and positive wound
culture were significantly reduced compared to placebo
group
• Length of hospital stay also reduced in supplemented
group
Pressure Ulcers
• Practice Guidelines
• National Pressure Ulcer Advisory Panel, European
Pressure Ulcer Advisory Panel, Pan Pacific Pressure
Injury Alliance nutrition guidelines for pressure ulcer
care
• “Supplement with high protein, arginine and
micronutrients for adults with a pressure ulcer.
Category/stage III or IV or multiple pressure ulcers when
nutritional requirements cannot be met with traditional
high calorie and protein supplements.”
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Pressure Ulcers
• Study performed to monitor effects of Arginine supplementation on rate of healing of existing pressure ulcers.
• 9g per day of Arginine for 8 weeks
• Surface area of PU decreased significantly earlier in the trial for supplemented patients
• Supplemented group showed overall more complete closure at the end of 8 weeks
• Total staff time spent in wound care and dressing changes was significantly reduced in the supplemented group.
Surgical/Trauma Wounds
• Glutamine supplementation in patients with
unhealed wounds 10 days post surgery.
• Supplementation of 19g daily for 14 days
• Supplementation group showed significantly reduced
time to wound closer after 14 days of supplementation.
• Glutamine reduction and reduction in O2 saturation
only noted in the placebo group.
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Surgical/Trauma Wounds
• Animal study of supplementation of arginine and
glutamine for ischemic wounds
• Increased rate of wound healing, with significantly
decreased size on day 10 and day 14.
• Reduction of inflammatory markers.
• Noted, but not statistically significant, increased
collagen accumulation and epithelialization in
supplemented group.
GI Disorders
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Glutamine and the Gut
• The effects of glutamine on the clinical outcome of
critically ill patients was proposed more 30 years ago .
• Although the metabolism is not fully understood several
pathways have been postulated to explain glutamine’s
beneficial effect on the gut .
• Two mechanisms with the greatest amount of literature
behind them are:
• Glutamine improves intestinal integrity
• Regulating intestinal immunity
Improvement of Intestinal
Integrity
• The GI epithelium serves as a barrier from the luminal contents
• Distribution of the barrier can lead to the diffusion of toxins such as lipopolysaccharides (LPS), allergens and pathogens into submucosal regions which induce inflammation and mucosal injury
• Current information suggest that glutamine is essential for the maintenance of barrier function in the intestinal epithelium.
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Improvement of Intestinal
Integrity
• Bertrand et al demonstrated that glutamine restores
tight junction in colonic mucosa of patients with
IBS.
• Hughes et al. explored the effect of glutamine on
jejunal cells during TPN administration
Glutamine and Intestinal
Immunity
• Glutamine is one of the most functionally versatile immunonutrients
for regulating intestinal immunity
• It serves as a primary metabolic nutrient for the gut-associated lymphoid
tissue (GALT)
• Reduces the oxidative burden
• Modulates cytokine balance
• Enhances cytoprotective heat shock response
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Reduction in Oxidative
Burden
• Zhou and Li showed that reactive oxygen species are produced in
abnormally high levels in IBD and play a role in the initiation and/or the
propagation of the disease state.
• In turn this lead to the theoretical basis for the use of antioxidants during
IBD conditions
• Glutamine is a precursor to glutathione, and glutamine treatment has been
shown to preserve glutathione stores in ex vivo models
• The jury is still out
Modulates Cytokine Balance
• The immune homeostasis of the intestinal mucosa is a delicate
balance
• Modulation of the gut cytokines profoundly affects the response of
GALT cells to luminal microbes
• Coeffier et al showed that a physiologic dose of Glutamine
effectively decreased the basal production of pro-inflammatory IL-6
and IL-8
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• The heat shock proteins are a group of proteins essential to cellular
survival under stressful conditions.
• Singleton et al presented evidence that glutamine can enhance heat
shock proteins 70 and 72
Enhances Heat Shock Response
What’s the Verdict?
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Contraindications
Acute Liver Failure
• Often admitted with excessively high plasma
glutamine levels
• Over-supplementation of any one amino acid is
contraindicated
• Does not apply to chronic liver failure or acute-on-
chronic liver failure
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Mechanically Ventilated Patients
• Two landmark studies showing contraindications:
• REDOXS
• MetaPlus
• Due to the similar research study results from both studies,
it brings concern about the supplementation of glutamine
REDOXS vs. MetaPlus
Adopted from van Zanten et al.
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Sepsis
• Decreased utilization by the gut during sepsis;
mainly used by the rapidly dividing immune cells
and the liver
• Further enhances the inflammatory response
Head Trauma Patients
• High interstitial concentration of glutamate
• In the intact brain, glutamate is released by the
brain, reabsorbed by nerve endings and metabolized
into glutamine
• Head trauma patients have no change in the net
balance of glutamate or glutamine across the brain
during supplementation
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Continuous Renal Replacement
Therapy
• Amino acids are lost in dialysate during CRRT
• Should be supplemented at a higher rate of
0.5g/kg/day rather than 0.3g/kg/day
Available Products
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Juven
• Supports tissue building in elderly in 2 weeks
• Helps maintain lean body mass (LBM) in cancer
cachexia patients in 4 weeks
• Recommended intake: 2 packets/day
• Administered orally or as a modular via feeding tube
• Active ingredients:
• Revigor (CaHMB, calcium B-hydroxy-B-methylbutyrate)
• Arginine
• Glutamine
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Preface
Glutamine, like any other nutritional supplement,
should be considered on an individualized basis
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