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Thawkar VN, Taksande K. Navigating Nutritional Strategies: Permissive Underfeeding in Critically Ill Patients. Cureus 2024; 16:e58083. [PMID: 38741818 PMCID: PMC11088961 DOI: 10.7759/cureus.58083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2024] [Accepted: 04/11/2024] [Indexed: 05/16/2024] Open
Abstract
Nutritional support is a critical component of care for critically ill patients, impacting their recovery and overall prognosis. Traditional approaches to feeding in the intensive care unit (ICU) have focused on meeting estimated energy requirements, often resulting in unintended consequences such as overfeeding and associated complications. Permissive underfeeding, a concept gaining attention recently, offers a more controlled approach by intentionally providing fewer calories than traditionally recommended. This comprehensive review explores the rationale, evidence, and practical considerations surrounding permissive underfeeding in critically ill patients. We discuss the physiological basis of permissive underfeeding, its potential benefits in mitigating the risks of overfeeding, and the challenges associated with implementation in clinical practice. Through an analysis of critical studies and clinical trials, we evaluate the comparative effectiveness of permissive underfeeding versus traditional feeding methods and examine its impact on patient outcomes. Recommendations for patient selection, monitoring, and future research directions are provided to guide clinicians in optimizing nutritional support strategies for critically ill individuals. By considering the role of permissive underfeeding alongside traditional feeding approaches, healthcare professionals can tailor nutritional interventions to individual patient needs, ultimately improving outcomes in the ICU.
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Affiliation(s)
- Varun N Thawkar
- Anaesthesiology, Jawaharlal Nehru Medical College, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| | - Karuna Taksande
- Anaesthesiology, Jawaharlal Nehru Medical College, Datta Meghe Institute of Higher Education and Research, Wardha, IND
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Perman MI, Ciapponi A, Franco JVA, Loudet C, Crivelli A, Garrote V, Perman G. Prescribed hypocaloric nutrition support for critically-ill adults. Cochrane Database Syst Rev 2018; 6:CD007867. [PMID: 29864793 PMCID: PMC6513548 DOI: 10.1002/14651858.cd007867.pub2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND There are controversies about the amount of calories and the type of nutritional support that should be given to critically-ill people. Several authors advocate the potential benefits of hypocaloric nutrition support, but the evidence is inconclusive. OBJECTIVES To assess the effects of prescribed hypocaloric nutrition support in comparison with standard nutrition support for critically-ill adults SEARCH METHODS: We searched the Cochrane Central Register of Controlled Trials (CENTRAL, Cochrane Library), MEDLINE, Embase and LILACS (from inception to 20 June 2017) with a specific strategy for each database. We also assessed three websites, conference proceedings and reference lists, and contacted leaders in the field and the pharmaceutical industry for undetected/unpublished studies. There was no restriction by date, language or publication status. SELECTION CRITERIA We included randomized and quasi-randomized controlled trials comparing hypocaloric nutrition support to normo- or hypercaloric nutrition support or no nutrition support (e.g. fasting) in adults hospitalized in intensive care units (ICUs). DATA COLLECTION AND ANALYSIS We used standard methodological procedures expected by Cochrane. We meta-analysed data for comparisons in which clinical heterogeneity was low. We conducted prespecified subgroup and sensitivity analyses, and post hoc analyses, including meta-regression. Our primary outcomes were: mortality (death occurred during the ICU and hospital stay, or 28- to 30-day all-cause mortality); length of stay (days stayed in the ICU and in the hospital); and Infectious complications. Secondary outcomes included: length of mechanical ventilation. We assessed the quality of evidence with GRADE. MAIN RESULTS We identified 15 trials, with a total of 3129 ICU participants from university-associated hospitals in the USA, Colombia, Saudi Arabia, Canada, Greece, Germany and Iran. There are two ongoing studies. Participants suffered from medical and surgical conditions, with a variety of inclusion criteria. Four studies used parenteral nutrition and nine studies used only enteral nutrition; it was unclear whether the remaining two used parenteral nutrition. Most of them could not achieve the proposed caloric targets, resulting in small differences in the administered calories between intervention and control groups. Most studies were funded by the US government or non-governmental associations, but three studies received funding from industry. Five studies did not specify their funding sources.The included studies suffered from important clinical and statistical heterogeneity. This heterogeneity did not allow us to report pooled estimates of the primary and secondary outcomes, so we have described them narratively.When comparing hypocaloric nutrition support with a control nutrition support, for hospital mortality (9 studies, 1775 participants), the risk ratios ranged from 0.23 to 5.54; for ICU mortality (4 studies, 1291 participants) the risk ratios ranged from 0.81 to 5.54, and for mortality at 30 days (7 studies, 2611 participants) the risk ratios ranged from 0.79 to 3.00. Most of these estimates included the null value. The quality of the evidence was very low due to unclear or high risk of bias, inconsistency and imprecision.Participants who received hypocaloric nutrition support compared to control nutrition support had a range of mean hospital lengths of stay of 15.70 days lower to 10.70 days higher (10 studies, 1677 participants), a range of mean ICU lengths of stay 11.00 days lower to 5.40 days higher (11 studies, 2942 participants) and a range of mean lengths of mechanical ventilation of 13.20 days lower to 8.36 days higher (12 studies, 3000 participants). The quality of the evidence for this outcome was very low due to unclear or high risk of bias in most studies, inconsistency and imprecision.The risk ratios for infectious complications (10 studies, 2804 participants) of each individual study ranged from 0.54 to 2.54. The quality of the evidence for this outcome was very low due to unclear or high risk of bias, inconsistency and imprecisionWe were not able to explain the causes of the observed heterogeneity using subgroup and sensitivity analyses or meta-regression. AUTHORS' CONCLUSIONS The included studies had substantial clinical heterogeneity. We found very low-quality evidence about the effects of prescribed hypocaloric nutrition support on mortality in hospital, in the ICU and at 30 days, as well as in length of hospital and ICU stay, infectious complications and the length of mechanical ventilation. For these outcomes there is uncertainty about the effects of prescribed hypocaloric nutrition, since the range of estimates includes both appreciable benefits and harms.Given these limitations, results must be interpreted with caution in the clinical field, considering the unclear balance of the risks and harms of this intervention. Future research addressing the clinical heterogeneity of participants and interventions, study limitations and sample size could clarify the effects of this intervention.
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Affiliation(s)
- Mario I Perman
- Instituto Universitario Hospital ItalianoArgentine Cochrane CentrePotosí 4234Buenos AiresCapital FederalArgentinaC1199ACL
| | - Agustín Ciapponi
- Institute for Clinical Effectiveness and Health Policy (IECS‐CONICET)Argentine Cochrane CentreDr. Emilio Ravignani 2024Buenos AiresCapital FederalArgentinaC1414CPV
| | - Juan VA Franco
- Instituto Universitario Hospital ItalianoArgentine Cochrane CentrePotosí 4234Buenos AiresCapital FederalArgentinaC1199ACL
| | - Cecilia Loudet
- Universidad Nacional de La PlataDepartment of Intensive CareBuenos AiresArgentina
- Universidad Nacional de La PlataDepartment of Applied PharmacologyBuenos AiresArgentina
| | - Adriana Crivelli
- Hospital HIGA San MartínUnit of Nutrition Support and Malabsorptive Diseases64 Nº 1417 1/2 Dep. 2La PlataPcia. de Buenos AiresArgentina1900
| | - Virginia Garrote
- Instituto Universitario Hospital ItalianoBiblioteca CentralJ.D. Perón 4190Buenos AiresArgentinaC1199ABB
| | - Gastón Perman
- Instituto Universitario Hospital ItalianoArgentine Cochrane CentrePotosí 4234Buenos AiresCapital FederalArgentinaC1199ACL
- Hospital Italiano de Buenos AiresDepartment of MedicineCongreso 2346 18º ABuenos AiresArgentina1430
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Parker EA, Feinberg TM, Wappel S, Verceles AC. Considerations When Using Predictive Equations to Estimate Energy Needs Among Older, Hospitalized Patients: A Narrative Review. Curr Nutr Rep 2017; 6:102-110. [PMID: 28868211 DOI: 10.1007/s13668-017-0196-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The aim of this narrative review was to summarize the accuracy of predictive equations used to estimate energy expenditure in older, hospitalized adults. More than 50% of patients admitted to intensive care units are older adults. Currently accepted prediction equations used to determine energy intake in the older, hospitalized patient were not specifically developed for the aging population. Rates of multimorbidity, polypharmacy and malnutrition, conditions that influence energy expenditure, are higher in older adults compared to younger adults. For these reasons, current equations may not accurately assess energy needs in this population. As the evidence demonstrating the importance of nutritional supplementation in older, hospitalized adults grows, more accurate energy assessment methods that account for age-related conditions are needed to predict nutritional requirements.
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Affiliation(s)
- Elizabeth A Parker
- Department of Family & Community Medicine, Center for Integrative Medicine, University of Maryland School of Medicine, 520 W. Lombard Street, Baltimore, MD, USA, (410) 706-6189,
| | - Termeh M Feinberg
- Department of Family & Community Medicine, Center for Integrative Medicine, University of Maryland School of Medicine, 520 W. Lombard Street, Baltimore, MD, USA, (410) 706-6173,
| | - Stephanie Wappel
- University of Maryland Medical Center, Pulmonary & Critical Care Medicine, 110 South Paca Street, Baltimore, MD, USA,
| | - Avelino C Verceles
- Department of Medicine, Division of Pulmonary, Critical Care, and Sleep Medicine, University of Maryland School of Medicine, 110 South Paca Street, Baltimore, MD, USA, (410) 328-8141,
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Hauffe T, Krüger B, Bettex D, Rudiger A. Shock Management for Cardio-surgical Intensive Care Unit Patient: The Silver Days. Card Fail Rev 2016; 2:56-62. [PMID: 28785454 DOI: 10.15420/cfr.2015:27:2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Shock in cardio-surgical intensive care unit (ICU) patients requires prompt identification of the underlying condition and timely therapeutic interventions. Management during the first 6 hours, also referred to as "the golden hours", is of paramount importance to reverse the shock state and improve the patient's outcome. The authors have previously described a state-of-the-art diagnostic work-up and discussed how to optimise preload, vascular tone, contractility, heart rate and oxygen delivery during this phase. Ideally, shock can be reversed during this initial period. However, some patients might have developed multiple organ dysfunction, which persists beyond the first 6 hours despite the early haemodynamic treatment goals having been accomplished. This period, also referred to as "the silver days", is the focus of this review. The authors discuss how to reduce vasopressor load and how to minimise adrenergic stress by using alternative inotropes, extracorporeal life-support and short acting beta-blockers. The review incorporates data on fluid weaning, safe ventilation, daily interruption of sedation, delirium management and early rehabilitation. It includes practical recommendations in areas where the evidence is scarce or controversial. Although the focus is on cardio-surgery ICU patients, most of the considerations apply to critical ill patients in general.
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Affiliation(s)
- Till Hauffe
- Cardiosurgical Intensive Care Unit, Institute of Anaesthesiology, University Hospital Zurich, Switzerland
| | - Bernard Krüger
- Cardiosurgical Intensive Care Unit, Institute of Anaesthesiology, University Hospital Zurich, Switzerland
| | - Dominique Bettex
- Cardiosurgical Intensive Care Unit, Institute of Anaesthesiology, University Hospital Zurich, Switzerland
| | - Alain Rudiger
- Cardiosurgical Intensive Care Unit, Institute of Anaesthesiology, University Hospital Zurich, Switzerland
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Hoffer LJ, Bistrian BR. Appropriate protein provision in critical illness: a systematic and narrative review. Am J Clin Nutr 2012; 96:591-600. [PMID: 22811443 DOI: 10.3945/ajcn.111.032078] [Citation(s) in RCA: 134] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND Widely varying recommendations have been published with regard to the appropriate amount of protein or amino acids to provide in critical illness. OBJECTIVE We carried out a systematic review of clinical trials that compared the metabolic or clinical effects of different protein intakes in adult critical illness and comprehensively reviewed all of the available evidence pertinent to the safe upper limit of protein provision in this setting. DESIGN MEDLINE was searched for clinical trials published in English between 1948 and 2012 that provided original data comparing the effects of different levels of protein intake on clinically relevant outcomes and evidence pertinent to the safe upper limit of protein provision to critically ill adults. RESULTS The limited amount and poor quality of the evidence preclude conclusions or clinical recommendations but strongly suggest that 2.0-2.5 g protein substrate · kg normal body weight⁻¹ · d⁻¹ is safe and could be optimum for most critically ill patients. At the present time, most critically ill adults receive less than half of the most common current recommendation, 1.5 g protein · kg⁻¹ · d⁻¹, for the first week or longer of their stay in an intensive care unit. CONCLUSION There is an urgent need for well-designed clinical trials to identify the appropriate level of protein provision in critical illness.
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Affiliation(s)
- L John Hoffer
- Lady Davis Institute for Medical Research, Jewish General Hospital, McGill University, Montreal, Canada.
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Kushner RF, Drover JW. Current strategies of critical care assessment and therapy of the obese patient (hypocaloric feeding): what are we doing and what do we need to do? JPEN J Parenter Enteral Nutr 2011; 35:36S-43S. [PMID: 21807928 DOI: 10.1177/0148607111413776] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Two of the most challenging issues in the clinical management of the obese patient are assessing energy requirements and whether hypocaloric (permissive) underfeeding should be employed. Multiple predictive equations have been used in the literature to estimate resting metabolic rate, although no consensus has emerged regarding which prediction equation is most accurate and precise in the obese population. Hypocaloric, or permissive underfeeding, specifically refers to the intentional administration of calories that are less than predicted energy expenditure. Thus far, very few studies performed have been performed to assess the efficacy of hypocaloric feeding in the obese hospitalized patient. It is concluded that the optimal caloric intake of obese patients in the intensive care unit remains unclear given the limitation of the existing data.
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Affiliation(s)
- Robert F Kushner
- Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA.
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Abstract
Predicting energy needs in children is complicated by the wide range of patient sizes, confusing traditional estimation equations, nonobjective stress-activity factors, and so on. These complications promote errors in bedside estimates of nutritional needs by rendering the estimation methods functionally unavailable to bedside clinicians. Here, the authors develop a simple heuristic energy prediction equation that requires only body mass (not height, age, or sex) as input. Expert estimation of energy expenditure suggested a power-law relationship between mass and energy. A similar mass-energy expenditure relationship was derived from published pediatric echocardiographic data using a Monte Carlo model of energy expenditure based on oxygen delivery and consumption. A simplified form of the equation was compared with energy required for normal growth in a cohort of historical patients weighing 2 to 70 kg. All 3 methods demonstrate that variation in energy expenditure in children is dominated by mass and can be estimated by the following equation: Power(kcal/kg/d) = 200 × [Mass(kg)(−0.4)]. This relationship explains 85% of the variability in energy required to maintain expected growth over a broad range of surgical clinical contexts. A simplified power-law equation predicts real-world energy needs for growth in patients over a wide range of body sizes and clinical contexts, providing a more useful bedside tool than traditional estimators.
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Affiliation(s)
- Thane Blinman
- Division of General, Thoracic and Fetal Surgery, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
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Abstract
Critically ill obese patients require timely nutrition in the intensive care unit. Hypocaloric, high protein nutritional feeding might have a role in critically ill obese patients. Although critically ill obese patients need special medical and nutritional care as do nonobese patients in the ICU, there are some differences in the literature about the initiation, routes, and nature of nutritional support. This article reviews the norms of nutritional care among critically ill obese patients and the differences between these patients and those with a normal BMI.
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Affiliation(s)
- Naeem Raza
- Department of Gastroenterology and Nutrition, Geisinger Medical Center, MC 21-11, 100 North Academy Avenue, Danville, PA 17822, USA
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Gerlach AT, Thomas S, Murphy CV, Stawicki PSP, Whitmill ML, Pourzanjani L, Steinberg SM, Cook CH. Does Delaying Early Intravenous Fat Emulsion during Parenteral Nutrition Reduce Infections during Critical Illness? Surg Infect (Larchmt) 2011; 12:43-7. [DOI: 10.1089/sur.2010.039] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Affiliation(s)
- Anthony T. Gerlach
- Department of Pharmacy, The Ohio State University Medical Center, Columbus, Ohio
| | - Sheela Thomas
- Department of Nutrition, The Ohio State University Medical Center, Columbus, Ohio
| | - Claire V. Murphy
- Department of Pharmacy, The Ohio State University Medical Center, Columbus, Ohio
| | | | - Melissa L. Whitmill
- Department of Surgery, The Ohio State University Medical Center, Columbus, Ohio
| | - Lydia Pourzanjani
- Department of Nutrition, The Ohio State University Medical Center, Columbus, Ohio
| | - Steven M. Steinberg
- Department of Surgery, The Ohio State University Medical Center, Columbus, Ohio
| | - Charles H. Cook
- Department of Surgery, The Ohio State University Medical Center, Columbus, Ohio
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Abstract
Nutrition support in the critically ill patient has shifted from adjunctive toward fundamental therapy with the publication of high-grade evidence. Early enteral nutrition (EN) is recommended because it is associated with decreased infectious complications and use of EN is associated with decreased mortality and infections compared with parenteral nutrition (PN). EN is not without risks, such as diarrhea or aspiration, but use of prokinetic agents, head of bed elevation, and use of feeding protocols can maximize benefits and minimize risks. Although recently high-grade evidence on nutrition support in the critically ill population has been published, many controversies still exist. In obese patients, use of hypocaloric feedings with increased protein has been demonstrated to promote weight loss and improved glucose management. In nonobese patients, small studies have demonstrated that providing more than 70% or less than 30% of goal caloric intake may be associated with worse outcomes, but more studies are needed. Additional research is also needed to conclude whether withholding intravenous fat emulsions for the first 7 to 10 days of PN reduces infectious complications. Finally, more high-quality studies are needed to define the role of immune-enhancing nutrients such as arginine, glutamine, omega-3 fatty acids, zinc, and selenium.
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Affiliation(s)
- Anthony T. Gerlach
- Department of Pharmacy, The Ohio State University Medical Center, Columbus, OH, USA
| | - Claire Murphy
- Department of Pharmacy, The Ohio State University Medical Center, Columbus, OH, USA
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de Aguilar-Nascimento JE, Dock-Nascimento DB, Bragagnolo R. Role of enteral nutrition and pharmaconutrients in conditions of splanchnic hypoperfusion. Nutrition 2010; 26:354-8. [DOI: 10.1016/j.nut.2009.08.021] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2009] [Accepted: 08/18/2009] [Indexed: 11/16/2022]
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Schwartz LK, Cusson G, Semrad C. Parenteral nutrition 101: a user's guide. Gastrointest Endosc 2009; 69:1351-3. [PMID: 19481653 DOI: 10.1016/j.gie.2009.03.1166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2009] [Accepted: 03/20/2009] [Indexed: 02/08/2023]
Affiliation(s)
- Lauren K Schwartz
- The Mount Sinai Hospital, Division of Gastroenterology, New York, NY, USA
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