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Bear DE, Summers MJ, Chapple LAS. Dietary protein in the ICU in relation to health outcomes. Curr Opin Clin Nutr Metab Care 2024:00075197-990000000-00168. [PMID: 39150402 DOI: 10.1097/mco.0000000000001066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 08/17/2024]
Abstract
PURPOSE OF REVIEW Critical care nutrition guidelines recommend provision of higher protein doses than recommended in health. These recommendations have been predominately based on lower quality evidence and physiological rationale that greater protein doses may attenuate the significant muscle loss observed in critically ill patients. This review discusses the mechanistic action of protein in the critically ill, details results from recent trials on health outcomes, discusses considerations for interpretation of trial results, and provides an overview of future directions. RECENT FINDINGS Two recent large clinical trials have investigated different protein doses and the effect on clinical outcome. Important findings revealed potential harm in certain sub-groups of patients. This harm must be balanced with the potential for beneficial effects on muscle mass and physical function given that two recent systematic reviews with meta-analyses demonstrated attenuation of muscle loss with higher protein doses. Utilizing biological markers such as urea: creatinine ratio or urea levels may prove useful in monitoring harm from higher protein doses. SUMMARY Future research should focus on prospectively investigating biological signatures of harm as well as taking into the consideration elements that will likely enhance the effectiveness of protein dose.
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Affiliation(s)
- Danielle E Bear
- Department of Nutrition and Dietetics
- Department of Critical Care, Guy's and St Thomas' NHS Foundation Trust
- Department of Nutritional Sciences, King's College London, London, UK
| | - Matthew J Summers
- Intensive Care Research, Royal Adelaide Hospital
- Adelaide Medical School, University of Adelaide, Adelaide, Australia
| | - Lee-Anne S Chapple
- Intensive Care Research, Royal Adelaide Hospital
- Adelaide Medical School, University of Adelaide, Adelaide, Australia
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van Gassel RJ, Weijzen ME, Kouw IW, Senden JM, Wodzig WK, Olde Damink SW, van de Poll MC, van Loon LJ. Administration of Free Amino Acids Improves Exogenous Amino Acid Availability when Compared with Intact Protein in Critically Ill Patients: A Randomized Controlled Study. J Nutr 2024; 154:554-564. [PMID: 38103646 DOI: 10.1016/j.tjnut.2023.12.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 11/24/2023] [Accepted: 12/11/2023] [Indexed: 12/19/2023] Open
Abstract
BACKGROUND Protein digestion and amino acid absorption appear compromised in critical illness. The provision of enteral feeds with free amino acids rather than intact protein may improve postprandial amino acid availability. OBJECTIVE Our objective was to quantify the uptake of diet-derived phenylalanine after the enteral administration of intact protein compared with an equivalent amount of free amino acids in critically ill patients. METHODS Sixteen patients who were mechanically ventilated in intensive care unit (ICU) at risk of malabsorption received a primed continuous infusion of L-[ring-2H5]-phenylalanine and L-[ring-3,5-2H2]-tyrosine after an overnight fast. Patients were randomly allocated to receive 20 g intrinsically L-[1-13C]-phenylalanine-labeled milk protein or an equivalent amount of amino acids labeled with free L-[1-13C]-phenylalanine via a nasogastric tube over a 2-h period. Protein digestion and amino acid absorption kinetics and whole-body protein net balance were assessed throughout a 6-h period. RESULTS After enteral nutrient infusion, both plasma phenylalanine and leucine concentrations increased (P-time < 0.001), with a more rapid and greater rise after free amino acid compared with intact protein administration (P-time × treatment = 0.003). Diet-derived phenylalanine released into the circulation was 25% greater after free amino acids compared with intact protein administration [68.7% (confidence interval {CI}: 62.3, 75.1%) compared with 43.8% (CI: 32.4, 55.2%), respectively; P < 0.001]. Whole-body protein net balance became positive after nutrient administration (P-time < 0.001) and tended to be more positive after free amino acid in provision (P-time × treatment = 0.07). CONCLUSIONS The administration of free amino acids as opposed to intact protein further increases postprandial plasma amino acid availability in critically ill patients, allowing more diet-derived phenylalanine to become available to peripheral tissues. This trial was registered at clinicaltrials.gov as NCT04791774.
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Affiliation(s)
- Rob Jj van Gassel
- Department of Surgery, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre +, Maastricht, The Netherlands; Department of Intensive Care Medicine, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre +, Maastricht, The Netherlands.
| | - Michelle Eg Weijzen
- Department of Human Biology, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre +, Maastricht, The Netherlands
| | - Imre Wk Kouw
- Department of Human Biology, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre +, Maastricht, The Netherlands
| | - Joan Mg Senden
- Department of Human Biology, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre +, Maastricht, The Netherlands
| | - Will Khw Wodzig
- Central Diagnostic Laboratory, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre +, Maastricht, The Netherlands
| | - Steven Wm Olde Damink
- Department of Surgery, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre +, Maastricht, The Netherlands; Department of General, Visceral- and Transplantation Surgery, RWTH Aachen University, Aachen, Germany
| | - Marcel Cg van de Poll
- Department of Surgery, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre +, Maastricht, The Netherlands; Department of Intensive Care Medicine, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre +, Maastricht, The Netherlands
| | - Luc Jc van Loon
- Department of Human Biology, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre +, Maastricht, The Netherlands
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Deutz NE, Haines KL, Wischmeier PE, Engelen MP. Amino acid kinetics in the critically ill. Curr Opin Clin Nutr Metab Care 2024; 27:61-69. [PMID: 37997794 PMCID: PMC10841855 DOI: 10.1097/mco.0000000000000995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2023]
Abstract
PURPOSE OF REVIEW Stable isotope methods have been used for many years to assess whole body protein and amino acid kinetics in critically ill patients. In recent years, new isotope approaches and tracer insights have been developed. The tracer pulse approach has some advantages above the established primed-continuous tracer infusion approach because of the high amount of metabolic information obtained, easy applicability, and low tracer costs. Effects of disease severity and sex on amino acid kinetics in ICU patients will also be addressed. RECENT FINDINGS Current knowledge was synthesized on specific perturbations in amino acid metabolism in critically ill patients, employing novel methodologies such as the pulse tracer approach and computational modeling. Variations were evaluated in amino acid production and linked to severity of critical illness, as measured by SOFA score, and sex. Production of the branched-chain amino acids (BCAAs), glutamine, tau-methylhistidine and hydroxyproline were elevated in critical illness, likely related to increased transamination of the individual BCAAs or increased breakdown of proteins. Citrulline production was reduced, indicative of impaired gut mucosa function. Sex and disease severity independently influenced amino acid kinetics in ICU patients. SUMMARY Novel tracer and computational approaches have been developed to simultaneously measure postabsorptive kinetics of multiple amino acids that can be used in critical illness. The collective findings lay the groundwork for targeted individualized nutritional strategies in ICU settings aimed at enhancing patient outcomes taking into account disease severity and sex.
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Affiliation(s)
- Nicolaas E.P. Deutz
- Center for Translational Research in Aging & Longevity, Texas A&M University
| | - Krista L. Haines
- Division of Trauma, Critical Care and Acute Care Surgery, Department of Surgery, Duke University Hospital
| | - Paul E. Wischmeier
- Division of Trauma, Critical Care and Acute Care Surgery, Department of Surgery, Duke University Hospital
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4
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Wittholz K, Fetterplace K, Karahalios A, Ali Abdelhamid Y, Beach L, Read D, Koopman R, Presneill JJ, Deane AM. Beta-hydroxy-beta-methylbutyrate supplementation and functional outcomes in multitrauma patients: A pilot randomized controlled trial. JPEN J Parenter Enteral Nutr 2023; 47:983-992. [PMID: 37357015 DOI: 10.1002/jpen.2527] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Revised: 05/21/2023] [Accepted: 05/24/2023] [Indexed: 06/27/2023]
Abstract
BACKGROUND Beta-hydroxy-beta-methylbutyrate (HMB) is a nutrition supplement that may attenuate muscle wasting from critical illness. This trial aimed to determine feasibility of administering a blinded nutrition supplement in the intensive care unit (ICU) and continuing it after ICU discharge. METHODS Single-center, parallel-group, blinded, placebo-controlled, randomized feasibility trial. After traumatic injury necessitating admission to ICU, participants were randomized to receive an enteral study supplement of 3 g of HMB (intervention) or placebo daily for 28 days or until hospital discharge. Primary outcome was feasibility of administering the study supplement, quantified as protocol adherence. Secondary outcomes included change in quadriceps muscle thickness, measured weekly until day 28 or hospital discharge by using ultrasound and analyzed by using a linear mixed model. RESULTS Fifty randomized participants (intervention, n = 26; placebo, n = 24) showed comparable baseline characteristics. Participants received 862 (84.3%) of the 1022 prescribed supplements during hospitalization with 543 (62.8%) delivered via an enteral feeding tube. The median (IQR) number of study supplements successfully administered per participant was 19.5 (13.0-24.0) in the intervention group and 16.5 (8.5-23.5) in the placebo group. Marked loss of quadriceps muscle thickness occurred in both groups, with the point estimate favoring attenuated muscle loss with the intervention, albeit with wide CIs (mean intervention difference after 28 days, 0.26 cm [95% CI, -0.13 to 0.64]). CONCLUSION A blinded, placebo-controlled, randomized clinical trial of daily enteral HMB supplementation for up to 28 days in hospital is feasible. Any effect of HMB supplementation to attenuate muscle wasting after traumatic injury remains uncertain.
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Affiliation(s)
- Kym Wittholz
- Department of Allied Health (Clinical Nutrition), The Royal Melbourne Hospital, Melbourne, Australia
- Department of Critical Care, Melbourne Medical School, The University of Melbourne, Melbourne, Australia
| | - Kate Fetterplace
- Department of Allied Health (Clinical Nutrition), The Royal Melbourne Hospital, Melbourne, Australia
- Department of Critical Care, Melbourne Medical School, The University of Melbourne, Melbourne, Australia
| | - Amalia Karahalios
- Center of Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Australia
| | - Yasmine Ali Abdelhamid
- Department of Critical Care, Melbourne Medical School, The University of Melbourne, Melbourne, Australia
- Department of Intensive Care, The Royal Melbourne Hospital, Melbourne, Australia
| | - Lisa Beach
- Department of Allied Health (Physiotherapy), The Royal Melbourne Hospital, Melbourne, Australia
| | - David Read
- Department of Trauma and General Surgery, The Royal Melbourne Hospital, Melbourne, Australia
| | - René Koopman
- Department of Anatomy and Physiology, Center for Muscle Research, The University of Melbourne, Melbourne, Australia
| | - Jeffrey J Presneill
- Department of Critical Care, Melbourne Medical School, The University of Melbourne, Melbourne, Australia
- Department of Intensive Care, The Royal Melbourne Hospital, Melbourne, Australia
| | - Adam M Deane
- Department of Critical Care, Melbourne Medical School, The University of Melbourne, Melbourne, Australia
- Department of Intensive Care, The Royal Melbourne Hospital, Melbourne, Australia
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Hermans AJH, Laarhuis BI, Kouw IWK, van Zanten ARH. Current insights in ICU nutrition: tailored nutrition. Curr Opin Crit Care 2023; 29:101-107. [PMID: 36762671 PMCID: PMC9994849 DOI: 10.1097/mcc.0000000000001016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
PURPOSE OF REVIEW To summarize recent research on critical care nutrition focusing on the optimal composition, timing, and monitoring of enteral feeding strategies for (post)-ICU patients. We provide new insights on energy and protein recommendations, feeding intolerance, and describe nutritional practices for coronavirus disease 2019 ICU patients. RECENT FINDINGS The use of indirect calorimetry to establish individual energy requirements for ICU patients is considered the gold standard. The limited research on optimal feeding targets in the early phase of critical illness suggests avoiding overfeeding. Protein provision based upon the absolute lean body mass is rational. Therefore, body composition measurements should be considered. Body impedance analysis and muscle ultrasound seem reliable, affordable, and accessible methods to assess body composition at the bedside. There is inadequate evidence to change our practice of continuous enteral feeding into intermittent feeding. Finally, severe acute respiratory syndrome coronavirus 2 patients are prone to underfeeding due to hypermetabolism and should be closely monitored. SUMMARY Nutritional therapy should be adapted to the patient's characteristics, diagnosis, and state of metabolism during ICU stay and convalescence. A personalized nutrition plan may prevent harmful over- or underfeeding and attenuate muscle loss. Despite novel insights, more research is warranted into tailored nutrition strategies during critical illness and convalescence.
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Affiliation(s)
- Anoek Jacqueline Hubertine Hermans
- Department of Intensive Care Medicine, Gelderse Vallei Hospital, Ede
- Wageningen University & Research, Division of Human Nutrition and Health, Wageningen, The Netherlands
| | | | | | - Arthur Raymond Hubert van Zanten
- Department of Intensive Care Medicine, Gelderse Vallei Hospital, Ede
- Wageningen University & Research, Division of Human Nutrition and Health, Wageningen, The Netherlands
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Sundström Rehal M, Tatucu-Babet OA, Oosterveld T. Indirect calorimetry: should it be part of routine care or only used in specific situations? Curr Opin Clin Nutr Metab Care 2023; 26:154-159. [PMID: 36729867 PMCID: PMC9894138 DOI: 10.1097/mco.0000000000000895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
PURPOSE OF REVIEW Indirect calorimetry (IC) is increasingly recommended to guide energy delivery in the ICU. This review aims to provide a critical overview of current literature in support of these recommendations. RECENT FINDINGS There is insufficient evidence to ascertain a mortality benefit from IC-guided energy delivery. However, large variations in energy expenditure during critical illness pose a risk for significant under- and overfeeding if IC is not routinely used. SUMMARY Even in the absence of demonstrable clinical benefits, there is a strong physiological rationale in favor of performing IC. Measurements can be prioritized in complex patients and should be repeated during prolonged ICU stay.
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Affiliation(s)
- Martin Sundström Rehal
- Department of Perioperative Medicine and Intensive Care, Karolinska University Hospital
- Department of Clinical Sciences, Intervention and Technology (CLINTEC), Karolinska Institutet, Stockholm, Sweden
| | - Oana A. Tatucu-Babet
- Australian and New Zealand Intensive Care Research Centre, School of Public Health and Preventive Medicine, Monash University, Melbourne, Australia
| | - Timo Oosterveld
- Department of Clinical Sciences, Intervention and Technology (CLINTEC), Karolinska Institutet, Stockholm, Sweden
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8
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Chapple LAS, Kouw IWK, Summers MJ, Weinel LM, Gluck S, Raith E, Slobodian P, Soenen S, Deane AM, van Loon LJC, Chapman MJ. Muscle Protein Synthesis Following Protein Administration in Critical Illness. Am J Respir Crit Care Med 2022; 206:740-749. [PMID: 35584344 DOI: 10.1164/rccm.202112-2780oc] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Rationale Dietary protein may attenuate the muscle atrophy experienced by patients in the Intensive Care Unit (ICU), yet protein handling is poorly understood. Objective To quantify protein digestion and amino acid absorption, and fasting and postprandial myofibrillar protein synthesis during critical illness. Methods Fifteen mechanically ventilated adults (12M; age 50±17y, Body Mass Index (BMI) 27±5kg·m-2) and 10 healthy controls (6M; 54±23y, BMI 27±4kg·m-2) received a primed intravenous L-[ring-2H5]-phenylalanine, L-[3,5-2H2]-tyrosine, and L-[1-13C]-leucine infusion over 9.5h, and a duodenal bolus of intrinsically-labelled (L-[1-13C]-phenylalanine and L-[1-13C]-leucine) intact milk protein (20g protein) over 60min. Arterial blood and muscle samples were taken at baseline (fasting) and for 6h following duodenal protein administration. Data are mean±SD; analysed with 2-way repeated measures ANOVA and independent samples t-test. Measurements and main results Fasting myofibrillar protein synthesis rates did not differ between ICU patients and healthy controls (0.023±0.013 vs 0.034±0.016%/h; P=0.077). Following protein administration, plasma amino acid availability did not differ between groups (ICU patients 54.2±9.1 vs healthy controls 61.8±13.1%; P=0.12), and myofibrillar protein synthesis rates increased in both groups (0.028±0.010 vs 0.043±0.018 %/h, main time effect P=0.046, P-interaction=0.584) with lower rates in ICU patients compared to healthy controls (main group effect P=0.001). Incorporation of protein-derived phenylalanine into myofibrillar protein was ~60% lower in ICU patients (0.007±0.007 vs 0.017±0.009 mole % excess (MPE); P=0.007). Conclusion The capacity for critically ill patients to use ingested protein for muscle protein synthesis is markedly blunted despite relatively normal protein digestion and amino acid absorption.
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Affiliation(s)
- Lee-Anne S Chapple
- Royal Adelaide Hospital, 1062, Intensive Care Unit, Adelaide, South Australia, Australia.,The University of Adelaide, 1066, Adelaide Medical School, Adelaide, South Australia, Australia.,The University of Adelaide, 1066, Centre of Research Excellence in Translating Nutritional Science to Good Health, Adelaide, South Australia, Australia;
| | - Imre W K Kouw
- Royal Adelaide Hospital, 1062, Intensive Care Unit, Adelaide, South Australia, Australia.,The University of Adelaide, 1066, Adelaide Medical School, Adelaide, South Australia, Australia.,The University of Adelaide, 1066, Centre of Research Excellence in Translating Nutritional Science to Good Health, Adelaide, South Australia, Australia.,Maastricht University Medical Centre+, 199236, Department of Human Biology, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht, Limburg, Netherlands
| | - Matthew J Summers
- Royal Adelaide Hospital, 1062, Intensive Care Unit, Adelaide, South Australia, Australia.,The University of Adelaide, 1066, Adelaide Medical School, Adelaide, South Australia, Australia
| | - Luke M Weinel
- Royal Adelaide Hospital, 1062, Intensive Care Unit, Adelaide, South Australia, Australia.,The University of Adelaide, 1066, Adelaide Medical School, Adelaide, South Australia, Australia
| | - Samuel Gluck
- Royal Adelaide Hospital, 1062, Intensive Care Unit, Adelaide, South Australia, Australia.,The University of Adelaide, 1066, Adelaide Medical School, Adelaide, South Australia, Australia
| | - Eamon Raith
- Royal Adelaide Hospital, 1062, Intensive Care Unit, Adelaide, South Australia, Australia.,The University of Adelaide, 1066, Adelaide Medical School, Adelaide, South Australia, Australia
| | - Peter Slobodian
- Central Adelaide Local Health Network, 375072, Pharmacy, Adelaide, South Australia, Australia
| | - Stijn Soenen
- The University of Adelaide, 1066, Centre of Research Excellence in Translating Nutritional Science to Good Health, Adelaide, South Australia, Australia.,Bond University Faculty of Health Sciences and Medicine, 104559, Gold Coast, Queensland, Australia
| | - Adam M Deane
- The University of Melbourne, 2281, Melbourne Medical School, Department of Critical Care, Melbourne, Victoria, Australia
| | - Luc J C van Loon
- NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre+, Department of Human Biology, Maastricht, Netherlands
| | - Marianne J Chapman
- Royal Adelaide Hospital, Intensive Care Unit, Adelaide, South Australia, Australia.,The University of Adelaide, 1066, Adelaide Medical School, Adelaide, South Australia, Australia.,The University of Adelaide, 1066, Centre of Research Excellence in Translating Nutritional Science to Good Health, Adelaide, South Australia, Australia
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Stolarski AE, Young L, Weinberg J, Kim J, Lusczek E, Remick DG, Bistrian B, Burke P. Early metabolic support for critically ill trauma patients: A prospective randomized controlled trial. J Trauma Acute Care Surg 2022; 92:255-265. [PMID: 34739002 PMCID: PMC8792201 DOI: 10.1097/ta.0000000000003453] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
BACKGROUND There is a lack of consensus regarding the optimal nutritional support for trauma patients. We hypothesize that early postinjury metabolic support focusing on adequate protein would modify the metabolic signature and alter the inflammatory environment for critically ill trauma patients. METHODS We conducted a prospective randomized controlled pilot trial for adult patients admitted to the surgical intensive care unit following traumatic injury. Patients were randomized to receive early metabolic support (EMS) (peripheral amino acid infusions) or standard of care (enteral nutrition as soon as feasible). Routine laboratory assessments, nitrogen balance, cytokines, and metabolomic analyses were assessed at baseline and day 5 after intervention. RESULTS A total of 42 trauma patients were randomized into well-balanced groups with similar age (32 years), Injury Severity Score (25), and body mass index (27.4 kg/m2). Early metabolic support provided significantly more protein (1.43 g/kg vs. 0.35 g/kg; p < 0.0001) and more calories (12.6 kcal/kg vs. 7.5 g/kg; p = 0.0012) over the first 5 days as compared with the standard of care. Early metabolic support modified protein catabolism and synthesis as demonstrated by a larger median negative nitrogen balance (-16.3 g vs. -5.3 g; p = 0.03) and a unique metabolomic profile at day 5. The biochemical profile of patients who received EMS was defined by greater declines in circulating levels of stress hormone precursors and increased levels of amino acids. The inflammatory response following EMS resulted in a greater decrease in interleukin-1B (p = 0.02) and increase in soluble interleukin-6 receptor (p = 0.01) between baseline and day 5 as compared with the standard of care. The EMS group had a decreased length of stay (15 vs. 22 days) and decreased surgical intensive care unit length of stay (8 vs. 9 days); however, this disappeared after adjustment for Injury Severity Score in this small population. CONCLUSIONS Early metabolic support with amino acid is safe, modifies metabolism, and may downregulate the inflammatory state associated with significant trauma, warranting a larger trial to assess for improved outcomes. LEVEL OF EVIDENCE Therapeutic/Care Management; Level II.
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Affiliation(s)
| | - Lorraine Young
- Department of Medicine, Boston Medical Center | Boston University
| | - Janice Weinberg
- Department of Biostatistics, Boston University School of Public Health
| | - Jiyoun Kim
- Department of Pathology, Boston Medical Center | Boston University
| | | | - Daniel G. Remick
- Department of Pathology, Boston Medical Center | Boston University
| | - Bruce Bistrian
- Department of Medicine, Beth Israel Deaconess Medical Center
| | - Peter Burke
- Department of Surgery, Boston Medical Center | Boston University
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Abstract
PURPOSE OF REVIEW This review will discuss recent studies showing that patients with chronic wasting diseases suffer from a variety of small intestinal impairments which might negatively impact the colonic microbiota and overall well-being. New insights will be addressed as well as novel approaches to assess intestinal function. RECENT FINDINGS Small intestinal dysfunction can enhance the amount and alter the composition of undigested food reaching the colon. As a result of reduced protein digestion and absorption, a large amount of undigested protein might reach the colon promoting the presence of pathogenic colonic bacteria and a switch from bacterial fiber fermentation to protein fermentation. While microbial metabolites of fiber fermentation, such as short-chain fatty acids (SCFA), are mainly considered beneficial for overall health, metabolites of protein fermentation, i.e. ammonia, branched SCFAs, hydrogen sulfide, polyamines, phenols, and indoles, can exert beneficial or deleterious effects on overall health. Substantial advances have been made in the assessment of small intestinal dysfunction in chronic diseases, but studies investigating the connection to colonic microbial metabolism are needed. A promising new stable isotope approach can enable the measurement of metabolite production by the colonic microbiota. SUMMARY Several studies have been conducted to assess intestinal function in chronic diseases. Impairments in intestinal barrier function, sugar absorption, protein digestion, and absorption, as well as small intestinal bacterial overgrowth were observed and possibly might negatively impact colonic bacterial metabolism. We suggest that improving these perturbations will improve overall patient health.
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Affiliation(s)
- Sarah K Kirschner
- Center for Translational Research in Aging & Longevity, Department of Health and Kinesiology, Texas A&M University, College Station, Texas, USA
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11
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De Waele E, Jonckheer J, Wischmeyer P. Indirect calorimetry in critical illness: a new standard of care? Curr Opin Crit Care 2021; 27:334-343. [PMID: 33990505 PMCID: PMC8367824 DOI: 10.1097/mcc.0000000000000844] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
PURPOSE OF REVIEW Review recent literature on the role of indirect calorimetry in critical care nutrition management. RECENT FINDINGS Critical illness demands objective, targeted nutritional therapy to prevent adverse effects of underfeeding/over feeding. Thus, all recent societal guidelines recommend indirect calorimetry use to determine energy needs. Very recently, indirect calorimetry technology has finally evolved to allow for accurate, simple, and routine utilization in a wider range of ICU patients. Recent data continues to confirm poor correlation between measured and equation-predicted energy expenditure emphasizing need for indirect calorimetry to be standard of care. This may be particularly true in COVID-19, where significant progressive hypermetabolism and variability in energy expenditure has been shown. Metabolic physiology can change frequently during ICU stay in response to changes in clinical condition or care. Thus, repeated longitudinal indirect calorimetry measures are needed throughout ICU stay to optimize care, with initial data showing improved clinical outcomes when indirect calorimetry targets are utilized. SUMMARY Personalized ICU care demands objective data to guide therapy. This includes use of indirect calorimetry to determine energy expenditure and guide ICU nutrition therapy. Long-awaited new innovations in indirect calorimetry technology should finally lead to indirect calorimetry to becoming a fundamental component of modern ICU standard of care and clinical research moving forward.
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Affiliation(s)
- Elisabeth De Waele
- Department of Clinical Nutrition, Universitair Ziekenhuis Brussel, Brussel, Belgium
- Department of Intensive Care Medicine, Universitair Ziekenhuis Brussel, Belgium
- Faculty of Medicine and Pharmacy, Vrije Universiteit Brussel, Brussels, Belgium
| | - Joop Jonckheer
- Department of Intensive Care Medicine, Universitair Ziekenhuis Brussel, Belgium
| | - Paul Wischmeyer
- Department of Anesthesiology and Surgery, Duke University School of Medicine, Durham, North Carolina, USA
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12
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Hsu CC, Sun CY, Tsai CY, Chen MY, Wang SY, Hsu JT, Yeh CN, Yeh TS. Metabolism of Proteins and Amino Acids in Critical Illness: From Physiological Alterations to Relevant Clinical Practice. J Multidiscip Healthc 2021; 14:1107-1117. [PMID: 34017176 PMCID: PMC8131070 DOI: 10.2147/jmdh.s306350] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Accepted: 04/23/2021] [Indexed: 12/29/2022] Open
Abstract
The clinical impact of nutrition therapy in critically ill patients has been known for years, and relevant guidelines regarding nutrition therapy have emphasized the importance of proteins. During critical illness, such as sepsis or the state following major surgery, major trauma, or major burn injury, patients suffer from a high degree of stress/inflammation, and during this time, metabolism deviates from homeostasis. The increased degradation of endogenous proteins in response to stress hormones is among the most important events in the acute phase of critical illness. Currently published evidence suggests that adequate protein supplementation might improve the clinical outcomes of critically ill patients. The role of sufficient protein supplementation may even surpass that of caloric supplementation. In this review, we focus on relevant physiological alterations in critical illness, the effects of critical illness on protein metabolism, nutrition therapy in clinical practice, and the function of specific amino acids.
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Affiliation(s)
- Chih-Chieh Hsu
- Division of General Surgery, Chang Gung Memorial Hospital, Taoyuan, 333, Taiwan
| | - Ci-Yuan Sun
- Division of Colon & Rectal Surgery, Chang Gung Memorial Hospital, Taoyuan, 333, Taiwan
| | - Chun-Yi Tsai
- Division of General Surgery, Chang Gung Memorial Hospital, Taoyuan, 333, Taiwan
| | - Ming-Yang Chen
- Division of General Surgery, Chang Gung Memorial Hospital, Taoyuan, 333, Taiwan
| | - Shang-Yu Wang
- Division of General Surgery, Chang Gung Memorial Hospital, Taoyuan, 333, Taiwan.,Chang Gung University, Taoyuan, 333, Taiwan
| | - Jun-Te Hsu
- Division of General Surgery, Chang Gung Memorial Hospital, Taoyuan, 333, Taiwan.,Chang Gung University, Taoyuan, 333, Taiwan
| | - Chun-Nan Yeh
- Division of General Surgery, Chang Gung Memorial Hospital, Taoyuan, 333, Taiwan.,Chang Gung University, Taoyuan, 333, Taiwan
| | - Ta-Sen Yeh
- Division of General Surgery, Chang Gung Memorial Hospital, Taoyuan, 333, Taiwan.,Chang Gung University, Taoyuan, 333, Taiwan
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Comprehensive metabolic amino acid flux analysis in critically ill patients. Clin Nutr 2021; 40:2876-2897. [PMID: 33946038 DOI: 10.1016/j.clnu.2021.03.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 03/04/2021] [Accepted: 03/12/2021] [Indexed: 01/16/2023]
Abstract
Amino acid (AA) metabolism is severely disturbed in critically ill ICU patients. To be able to make a more scientifically based decision on the type of protein or AA nutrition to deliver in ICU patients, comprehensive AA phenotyping with measurements of plasma concentrations and whole body production (WBP) is needed. Therefore, we studied ICU patients and matched control subjects using a novel pulse isotope method to obtain in-depth metabolic analysis. In 51 critically ill ICU patients (SOFA~6.6) and 49 healthy controls, we measured REE and body composition/phase-angle using BIA. In the postabsorptive state, we collected arterial (ized) blood for CRP and AA. Then, we administered an 8 mL solution containing 18 stable AA tracers as a pulse and calculated WBP. Enrichments: LC-MS/MS and statistics: t-test, ANCOVA. Compared to healthy, critically ill ICU patients had lower phase-angle (p < 0.00001), and higher CRP (p < 0.0001). Most AA concentrations were lower in ICU patients (p < 0.0001), except tau-methylhistidine and phenylalanine. WBP of most AA were significantly (p < 0.0001) higher with increases in glutamate (160%), glutamine (46%), and essential AA. Remarkably, net protein breakdown was lower. There were only weak relationships between AA concentrations and WBP. Critically ill ICU patients (SOFA 8-16) had lower values for phase angle (p = 0.0005) and small reductions of most plasma AA concentrations, but higher tau-methylhistidine (p = 0.0223) and hydroxyproline (p = 0.0028). Remarkably, the WBP of glutamate and glutamine were lower (p < 0.05), as was their clearance, but WBP of tau-methylhistidine (p = 0.0215) and hydroxyproline (p = 0.0028) were higher. Our study in critically ill ICU patients shows that comprehensive metabolic phenotyping was able to reveal severe disturbances in specific AA pathways, in a disease severity dependent way. This information may guide improving nutritional compositions to improve the health of the critically ill patient. CLINICAL TRIAL REGISTRY: Data are from the baseline measurements of study NCT02770092 (URL: https://clinicaltrials.gov/ct2/show/NCT02770092) and NCT03628365 (URL: https://clinicaltrials.gov/ct2/show/NCT03628365).
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van Gassel RJJ, van de Poll MCG, Schaap FG, Plummer M, Deane A, Olde Damink SWM. Postprandial rise of essential amino acids is impaired during critical illness and unrelated to small-intestinal function. JPEN J Parenter Enteral Nutr 2021; 46:114-122. [PMID: 33666262 PMCID: PMC9293041 DOI: 10.1002/jpen.2103] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Background Postprandial rise of plasma essential amino acids (EAAs) determines the anabolic effect of dietary protein. Disturbed gastrointestinal function could impair the anabolic response in critically ill patients. Aim was to investigate the postprandial EAA response in critically ill patients and its relation to small‐intestinal function. Methods Twenty‐one mechanically ventilated patients and 9 healthy controls received a bolus containing 100 ml of a formula feed (Ensure) and 2 g of 3‐O‐Methyl‐d‐glucose (3‐OMG) via postpyloric feeding tube. Fasting and postprandial plasma concentrations of EAAs, 3‐OMG, total bile salts, and the gut‐released hormone fibroblast growth factor 19 (FGF19) were measured over a 4‐hour period. Changes over time and between groups were assessed with linear mixed‐effects analysis. Early (0–60 minutes) and total postprandial responses are summarized as the incremental area under the curve (iAUC). Results At baseline, fasting EAA levels were similar in both groups: 1181 (1055–1276) vs 1150 (1065–1334) μmol·L−1, P = .87. The early postprandial rise in EAA was not apparent in critically ill patients compared with healthy controls (iAUC60, −4858 [−6859 to 2886] vs 5406 [3099–16,853] µmol·L−1·60 minutes; P = .039). Impaired EAA response did not correlate with impaired 3‐OMG response (Spearman ρ 0.32, P = .09). There was a limited increase in total bile salts but no relevant FGF19 response in either group. Conclusion Postprandial rise of EAA is blunted in critically ill patients and unrelated to glucose absorption measured with 3‐OMG. Future studies should aim to delineate governing mechanisms of macronutrient malabsorption.
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Affiliation(s)
- Rob J J van Gassel
- Department of Surgery, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands.,Department of Intensive Care Medicine, Maastricht University Medical Centre, The Netherlands
| | - Marcel C G van de Poll
- Department of Surgery, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands.,Department of Intensive Care Medicine, Maastricht University Medical Centre, The Netherlands
| | - Frank G Schaap
- Department of Surgery, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands.,Department of General, Visceral and Transplantation Surgery, RWTH University Hospital Aachen, Aachen, Germany
| | - Mark Plummer
- Centre for Integrated Critical Care, University of Melbourne, Melbourne, Victoria, Australia.,Department of Intensive Care, Royal Melbourne Hospital, Melbourne, Victoria, Australia
| | - Adam Deane
- Centre for Integrated Critical Care, University of Melbourne, Melbourne, Victoria, Australia.,Department of Intensive Care, Royal Melbourne Hospital, Melbourne, Victoria, Australia
| | - Steven W M Olde Damink
- Department of Surgery, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands.,Department of General, Visceral and Transplantation Surgery, RWTH University Hospital Aachen, Aachen, Germany
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Abstract
PURPOSE OF REVIEW Timing, dose, and route of protein feeding in critically ill patients treated in an ICU is controversial. This is because of conflicting outcomes observed in randomized controlled trials (RCTs). This inconsistency between RCTs may occur as the physiology of protein metabolism and protein handling in the critically ill is substantially different from the healthy with limited mechanistic data to inform design of RCTs. This review will outline the current knowledge and gaps in the understanding of protein absorption and kinetics during critical illness. RECENT FINDINGS Critically ill patients, both children and adults, lose muscle protein because of substantial increases in protein degradation with initially normal, and over time increasing, protein synthesis rates. Critically ill patients appear to retain the capacity to absorb dietary protein and to use it for building body protein; however, the extent and possible benefit of this needs to be elucidated. More sophisticated methods to study protein absorption and digestion have recently been described but these have yet to be used in the critically ill. SUMMARY Adequate understanding of protein absorption and kinetics during critical illness will help the design of better interventional studies in the future. Because of the complexity of measuring protein absorption and kinetics in the critically ill, very few investigations are executed. Recent data using isotope-labelled amino acids suggests that critically ill patients are able to absorb enteral protein and to synthesize new body protein. However, the magnitude of absorption and anabolism that occurs, and possible benefits for the patients need to be elucidated.
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Affiliation(s)
- Felix Liebau
- Perioperative Medicine and Intensive Care, Karolinska University Hospital
- Division of Anesthesiology and Intensive Care, CLINTEC, Karolinska Institutet, Huddinge, Sweden
| | - Adam M Deane
- Department of Medicine and Radiology, Melbourne Medical School, University of Melbourne, Royal Melbourne Hospital, Parkville, Victoria, Australia
| | - Olav Rooyackers
- Perioperative Medicine and Intensive Care, Karolinska University Hospital
- Division of Anesthesiology and Intensive Care, CLINTEC, Karolinska Institutet, Huddinge, Sweden
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