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- •Contents
- •Outcome Evaluation
- •Introduction
- •Clinical Presentation of Muscular Weakness in the Critical Patients
- •Critical Illness Polyneuropathy (CIP) and Critical Illness Myopathy (CIM)
- •Ventilator-Induced Diaphragmatic Dysfunction (VIDD)
- •Dysphagia, Swallowing, and Effective Cough
- •The Pathophysiology of Acute Skeletal Muscle Wasting
- •Risk Factors
- •Short-Term and Long-Term Outcome
- •Conclusions
- •References
- •Introduction
- •The Neuroendocrine Response
- •Pathophysiology of Stress Response
- •The Hypothalamus-Pituitary-Adrenal (HPA) Axis
- •GH Axis
- •Pituitary-Thyroid Axis
- •Pituitary-Adrenal Axis
- •Mitochondrial Dysfunction
- •Metabolic Aspects of Stress Response
- •Conclusion
- •References
- •Introduction
- •Disorders of Fluid Balance
- •Dysionemias
- •Dysnatremias
- •Dyskalemias
- •Other Electrolyte Derangements (Calcium, Magnesium, Phosphorus)
- •Alterations of Acid Base Balance
- •Acid-Base Disturbances
- •Metabolic Acidosis
- •Respiratory Acidosis
- •Metabolic Alkalosis
- •Respiratory Alkalosis
- •Conclusion
- •References
- •Introduction
- •Epidemiology and Risk Factors
- •Diagnosis
- •Differential Diagnosis
- •Treatment
- •Prognosis
- •Future Perspectives
- •References
- •Introduction
- •Gut Microbiome
- •Gut-Organ Axis
- •Gut-Lung Axis
- •ICU Dysbiosis
- •Gut Changes
- •Microbial Therapy in ICU
- •Antimicrobial Stewardship
- •Nutrition as a Key Factor for Gut Microbiome Homeostasis
- •Probiotics, Prebiotics, and Synbiotics
- •Fecal Microbiota Transplantation
- •Conclusion
- •References
- •Introduction
- •Validation Process
- •Screening Tools Overview
- •Discussion
- •Conclusion
- •References
- •Introduction
- •Fight-and-Flight Reaction
- •Calorimetry and Total Energy Expenditure
- •Role of Mitochondria in the Various Stages of Intensive Care Recovery
- •REE in Different Clinical Scenarios
- •Conclusions
- •References
- •Introduction
- •Nutrition in ICU: Evidence from RCTs
- •Inclusion of Too Many Patients Considered at Low Nutritional Risk
- •Unfavorable Energy to Protein Doses
- •Absence of Indirect Calorimetry-Guided Energy Dosing
- •Anabolic Resistance
- •Suppression of Fasting-Induced Recovery Pathways
- •Future Perspectives
- •Development and Validation of Tools to Guide Individualized Nutritional Support
- •Implications for Clinical Practice
- •Conclusion
- •References
- •Introduction
- •Protein Metabolism in Critical Illness
- •Protein Requirements and Current Evidence
- •Timing of Introduction
- •Early mobilization, Exercise, and Adjuvant Therapies
- •Conclusion
- •References
- •Introduction
- •Computed Tomography Scan
- •Bioelectrical Impedance Analysis
- •Musculoskeletal Ultrasound
- •Respiratory Muscle Ultrasound
- •Limb Muscles
- •Conclusions
- •References
- •Functional Principles
- •Hydration Status Evaluations in Critically Ill Patients
- •Body Composition and Nutrition in ICU
- •Limits of BIVA in Critically Ill Patients
- •Conclusions
- •References
- •Introduction
- •Introduction
- •Historical Perspective
- •Enteral Versus Parenteral Nutrition Nowadays
- •Conclusions
- •References
- •Enteral Nutrition
- •Components of Enteral Mixtures
- •Choice of the Enteral Mixture
- •Special Composition Formulas
- •Conclusions
- •References
- •Introduction
- •Complications Related to Enteral Feeding Tubes
- •Aspiration
- •Gastrointestinal Intolerance
- •Diarrhea
- •New Horizons
- •New Technologies to Prevent Enteral Nutrition Complications
- •Advanced Tube Feedings
- •smART Platform
- •Conclusions
- •References
- •Introduction
- •Composition of PN Admixtures
- •Energetic Substrates
- •Carbohydrates
- •Lipid Emulsions
- •Proteins
- •Micronutrients: Electrolytes, Vitamins, and Trace Elements
- •Types of Parenteral Nutrition
- •Compatibility and Stability of the Parenteral Nutrition
- •References
- •Introduction
- •Metabolic Complications
- •Hyperglycemia
- •Hypertriglyceridemia
- •Liver Disease: Steatosis, Cholestatic Disease, and Gallbladder Stones
- •Refeeding Syndrome
- •Mechanical Complications
- •Infectious Complications
- •Conclusions
- •References
- •Introduction
- •Macronutrients
- •Glutamine
- •Arginine
- •Leucine
- •ω-3 Fatty Acids
- •Micronutrients
- •Antioxidant Vitamins
- •Antioxidant Trace Elements
- •Probiotics, Prebiotics or Symbiotics
- •Use of Probiotics in Clinical Practice?
- •References
- •Introduction
- •Pathophysiological Mechanisms, Risk Factors, and Clinical Implications
- •Pathophysiological Mechanisms of ICUAW
- •Risk Factors Associated with Physical and Functional Recovery in Critically Ill Patients
- •Clinical Impact of Poor Physical and Functional Recovery in Critical Illnesses
- •How to Assess Physical and Functional Recovery in Critical Illnesses
- •Management and Therapies
- •Nutritional Therapy
- •Other Supportive Therapies
- •Patient- and Family-centered ICU Environment
- •Conclusions
- •References
- •Bioethics in Clinical Practices
- •Ethical Consideration on Nutrition
- •Conclusion
- •References
- •Introduction
- •Nutrition in ARDS
- •Caloric Goals
- •Diet Composition
- •Immunonutrition
- •Oral Versus Enteral Versus Parenteral Nutrition
- •Nutrition in COVID-19 Respiratory Failure
- •Nutrition in ECMO Support
- •Enteral Nutrition
- •Parenteral Nutrition
- •Nutritional Goals
- •Conclusions
- •References
- •Introduction
- •Timing and Route of Nutritional Support
- •Initial Assessment of the Burn Patient
- •Estimation of Energy Expenditure
- •Macronutrients and Micronutrients
- •Proteins
- •Carbohydrates
- •Immunonutrients
- •Arginine
- •Nucleotides
- •ω3 Fatty Acids
- •Glutamine
- •Monitoring of Nutritional Support
- •Nutritional Support for Trauma Patients
- •Route of Feeding: Digestive Tract (Enteral Nutrition) Versus Intravenous (Parenteral Nutrition)
- •Standard or Immune-Enhancing Enteral Nutrition
- •Estimation or Measurement of Energy Requirements
- •Macronutrients
- •Conclusions
- •References
- •Introduction
- •General Considerations
- •Assessment of Nutritional Needs
- •Metabolic Changes Induced by Sepsis, AKI, and CRRT
- •Protein Metabolism
- •Lipid Metabolism
- •Vitamins and Trace Elements
- •Phosphates
- •Approaches to Nutrition
- •Enteral
- •Parenteral
- •Timing
- •Recommendations
- •Conclusion
- •References
- •Introduction
- •Acute Liver Failure
- •Nutrition in ALF
- •Acute Pancreatitis
- •IAP Management
- •Conclusions
- •References
- •Introduction
- •Nutritional Considerations in Major Surgery
- •Nutritional Requirements During and After Major Surgery
- •Challenges in Meeting Nutritional Needs Post-Surgery
- •Strategies for Enhancing Nutritional Intake and Absorption
- •Intestinal Failure: Nutritional Challenges and Management
- •Impact of Intestinal Failure on Nutritional Status
- •Nutritional Management Strategies for Patients with Intestinal Failure
- •Role of Parenteral Nutrition and Enteral Nutrition in Intestinal Failure Cases
- •Open Abdomen: Nutritional Support and Wound Healing
- •Nutritional Requirements for Patients with Open Abdomen Wounds
- •Challenges in Providing Nutritional Support to Patients with Open Abdomen
- •Clinical Protocols and Guidelines for Nutritional Support
- •Conclusions
- •References
- •Introduction
- •Nutrition Therapy
- •Determination of Energy Expenditure
- •Route and Timing of Enteral Nutrition
- •Intolerance to Enteral Nutrition
- •Brain Energy Metabolism and Energy Dysfunction Following Acute Brain Injury
- •In Vivo Brain Energy and Glucose Monitoring
- •Alternative Energy Substrates
- •Lactate
- •Ketone Bodies
- •Immunonutrition and Micronutrients
- •Conclusions and Future Directions
- •References
- •Introduction
- •AKI and Cardiac Surgery
- •AKI and Vascular Surgery
- •AKI and Sepsis
- •AKI and Surgery
- •Trauma
- •Burn
- •AKI and COVID-19
- •Conclusion
- •References
- •Introduction
- •AKI Etiology
- •Subclinical AKI and AKI Biomarkers
- •Subphenotyping AKI
- •Conclusions
- •References
- •Introduction
- •What Are Biomarkers?
- •Novel Biomarkers: How Can They be Implemented?
- •Biomarkers for the Prediction of AKI and Detection of Subclinical Stages
- •Postoperative Biomarker-Guided Prevention of AKI in Patients at High Risk
- •Biomarkers for Other Indications
- •Conclusion
- •References
- •Introduction
- •The Machine Learning Arena
- •The Challenges of Timely Prediction of Acute Kidney Injury
- •Early Machine Learning Models for AKI Prediction
- •New Techniques for AKI Prediction Using Deep Learning ML Models
- •Clinical Decision Support Systems
- •The Translational Research Gap and the Value of Data Sharing: A Plea for Data Sharing
- •Limitations of Machine Learning Models
- •Conclusions
- •References
- •Introduction
- •Doppler Assesses Vascular Congestion
- •Arterial Renal Doppler Ultrasound in AKI
- •Integration of Renal Resistive Index and Intrarenal Venous Flow
- •Contrast-Enhanced Ultrasound for Assessing Renal Perfusion
- •Conclusions
- •References
- •Introduction
- •Renal Perfusion and Goals of Fluids in AKI
- •Clinical Evaluation of a Patient with AKI in ICU
- •Studies Which Investigated the Association of Fluid Therapy and AKI
- •Volume of Fluid
- •Type of Fluid
- •Crystalloids
- •Colloids
- •Starches
- •Gelatins
- •Conclusion
- •References
- •Introduction
- •Pathophysiology of Renal Perfusion
- •Acute Kidney Injury
- •Norepinephrine
- •Epinephrine
- •Dopamine
- •Vasopressin
- •Terlipressin
- •Angiotensin II
- •Conclusions
- •References
- •Introduction
- •Pharmacology of Diuretics
- •Loop Diuretics
- •Other Classes of Diuretics
- •Indications for Diuretics in AKI
- •Control of Fluid Overload
- •AKI Prognostication
- •Situations in Which Diuretics Are Not Indicated
- •AKI Recovery
- •How to Use Diuretics in the ICU
- •Class and Dose Selection
- •Modality of Loop Diuretic Administration
- •Conclusions
- •References
- •Introduction
- •What Is Acute Kidney Disease?
- •Clinical Course of AKD Within the ICU
- •Management of AKD in Critical Care and Beyond
- •Conclusions and Future Directions
- •References
- •Introduction
- •Renal Functional Reserve
- •Renal Functional Reserve and Renal Recovery After Acute Kidney Injury
- •Conclusion
- •References
- •Background
- •Membrane and Filter Characteristics
- •Geometric Characteristics
- •Performance Characteristics
- •Mechanisms of Fluid and Solute Transport
- •Treatment Modalities
- •Treatment Dose
- •Nomenclature of Renal Replacement Therapies
- •Continuous Therapies
- •Intermittent Therapies
- •Hybrid Therapies
- •Conclusion
- •References
- •Introduction
- •Dialysis Catheters: Technical Aspects
- •Selection of the Site for Dialysis
- •Catheter Insertion Technique
- •Dialysis Catheter Complications
- •Dialysis Catheter Maintenance
- •Conclusions
- •References
- •Introduction
- •Non-pharmacological Strategies to Reduce Membrane Fouling
- •Pharmacological Strategies to Reduce Membrane Clotting
- •Unfractionated Heparin (UFH) Systemic Anticoagulation
- •Systemic Anticoagulation with Low Molecular Weight Heparin (LMWH)
- •Regional Citrate Anticoagulation (RCA)
- •Systemic Anticoagulation with Direct Thrombin Antagonists
- •Nafamostat
- •Conclusions
- •References
- •Introduction
- •CRRT Dose/Outcome Studies: Consideration of Solute Kinetics
- •CRRT Dose as a Quality Criterion
- •CRRT Dose in the Context of Therapy Quality
- •Conclusions
- •References
- •Introduction
- •Patient Selection and Indications for Starting RRT
- •Strategies to Identify Need for RRT
- •Rationale for an Early Strategy to Starting RRT
- •Rationale for a Conservative Strategy to Starting RRT
- •RRT Replacement Therapy and Clinical Outcomes
- •Current Clinical Practice Guideline Recommendations
- •Clinical Trial Evidence on Timing of Starting RRT
- •Implications for Practice
- •Existing Knowledge Gaps and Future Research
- •Conclusions
- •References
- •Introduction
- •Early ICU Phase before KRT
- •Nutrition Care
- •Monitoring
- •ICU Phase with KRT
- •Gains and Losses During CRRT
- •Electrolyte Loss in CRRT
- •Macronutrient Loss in CRRT
- •Macronutrient Gain in CRRT
- •Micronutrients and Vitamin Loss in CRRT
- •Management of Losses During CRRT
- •Monitoring During CRRT
- •Indirect Calorimetry During CRRT
- •ICU Phase After CRRT
- •EN and PN Product Selection
- •Conclusions
- •References
- •Introduction
- •Nomenclature
- •Continuous Therapies
- •Intermittent Renal Replacement Therapies (IRRTs)
- •Hybrid Therapies
- •Technical Aspects of RRT Techniques
- •Hemodynamic Stability
- •Solute Clearance
- •Fluid Balance
- •Vascular Access
- •Anticoagulation
- •Drug Dosing
- •Patient Mobilization
- •The Process of RRT Prescription and Administration
- •Indications of RRT
- •Timing
- •Prescription Parameters
- •Dosing
- •Membrane Choice
- •Dialysate and Reinfusion Solutions
- •Limitations of RRT in Critical Care
- •Patient Safety During RRT in Critical Care
- •Introduction
- •Steps in RRT Management and Protocol Application

220 L. Moretto et al.
immunonutrition. Eventually, a 2019 Cochrane metanalysis of ten trials investigating immunonutrition in ARDS reported only uncertain bene fits on 28-day mortality,
duration of mechanical ventilation, ICU length of stay, and oxygenation, with a
generally low quality of evidence. However, negative outcomes associated with
omega-3 FA were only observed in a bolus administration with low protein regimen
[
20]. Significant advantage instead seems to derive from the intravenous use of fish
oil (FO) emulsions—which is the most common source of omega-3 FA. One
metanalysis of 49 prospective randomized controlled trials showed a 40% and a
56% lower risk of infection and sepsis, respectively, by using FO emulsions as
compared to standard lipid emulsions [
through FO is generally recommended. When PN is used, FO dose should range
from 0.1 to 0.2 g/kg/day [2].
Lastly, some aspects of ARD
influence on MNT.
21]. Therefore, the provision of omega-3 FA
S treatment need further discussion because of their
Oral Versus Enteral Versus Parenteral Nutrition
Studies show that non-intubated patients in acute respiratory failure are largely
underfed. Oral feeding is recommended, but not always possible, due to the inability
to eat during noninvasive ventilation or because of altered mental status. Moreover,
enteral support may increase the risk of aspiration and noninvasive ventilation
duration, while large-diameter feeding tubes may cause air leakage. In this setting,
guidelines favor the oral route, but when nutritional targets are not met, oral
supplements first and then EN should be considered, introducing PN only when
the enteral route is inadequate or contraindicated [2, 13].
Specific Settings: Post-extubation Dysphagia, Tracheostomy,
and Prone Position
Post-extubation dysphagia is a common yet poorly recognized condition, affecting
around 18% of all ICU patients, and associated with severe complications, such as
aspiration pneumonia, prolonged ICU and hospital stay, and increased morbidity and
mortality. Although underlying mechanisms are unknown, endotracheal tube placement and prolonged mechanical ventilation are considered key risk factors [22]. Oral
feeding must be delayed and the risk of aspiration assessed if a swallowing disorder
is recognized after screening for dysphagia. If any risk is present, EN should be
provided through post-pyloric feeding. Otherwise, texture-adapted food can be
considered. When EN is impossible, PN should replace it [2].
case of tracheostomy, oral route is preferred as well, and the same
In the
indications as for non-intubated patients apply [2].

20 Nutrition in ARDS, COVID-19, and ECMO 221
Nutritional suppor t in non-intubated patients is therefore a complex topic, and
several factors need to be considered, such as swallow ability, mental status, type of
ventilatory support, and disease phase. In this scenario, multidisciplinarity is the key
to the MNT [
Prone position is a life-saving practice in moderate-severe ARDS, often
employed for several days during the acute phase. The enteral route is the preferred
one for feeding in the ICU, and its early initiation is desired [2, 13], thus making its
implementation in prone patients necessary. There are some concerns that the prone
position increases the risk of gastric intolerance, with higher residual gastric volume
and vomiting [
confirmed in ARDS, where a diet with a high ratio of EN during pronation was
associated with a lower mortality [24], without increasing adverse events risk [25].
Finally, in case of fluid restriction, it becomes necessary to avoid a harmful
positive fluid balance. Concentrated enteral and parenteral formulas may be useful
to reach the set nutrients and caloric goals while decreasing the administered feeding
volume.
2].
23]. Nonetheless, the beneficial effect of the enteral route was
Nutrition in COVID-19 Respiratory Failure
In 2019, the novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)
was identified as the cause of the coronav irus disease 2019 (COVID-19) pandemic,
which became a global health emergency. Penetration of SARS-CoV-2 into the body
takes place in the lungs through the ACE-2 receptor, whereby the prevalent respiratory involvement. However, this cell-surface receptor is also present in the kidney,
blood vessels, and heart, which accounts for its multisystem involvement. SARSCoV-2 patients can be asymptomatic or show a wide range of mild (e.g., cough,
chills, fever, fatigue, and dyspnea) and severe manifestations, such as ARDS, heart
failure, and septic shock [26].
Inflammati
the most severe cases, where multiple organ damage is attributable to uncontrolled
inflammation with massive pro-inflammatory cytokine release [26].
Nutritional risk is highly prevalent in COVID-19 patients and its etiology is
multifactorial. The inflammatory response, and the subsequent hypermetabolic
state, increases energy and protein needs. Disease severity, with a high systemic
inflammation burden, is associated with greater weight loss [27]. Comorbidities add
complexity to meeting nutritional requirements. Reduced food intake is also implicated, usually as a consequence of the typical COVID-19 gastrointestinal symptoms,
such as nausea, emesis, diarrhea, ageusia/dysgeusia, and anosmia. Furthermore, two
of the most common risk factors for severe COVID-19, obesity and older age, are
also risk factors for both malnutrition and metabolic impairment [28].
Sarcopenia
hypoxemia, and mechanical ventilation may all cause loss of muscle mass and
function. The need for social isolation during the outbreaks may have led to
plays a key role in the pathogenesis of COVID-19, particularly in
on
is also highly prevalent: systemic inflammation, immobilization,

222 L. Moretto et al.
decreased physical activity and malnutrition, especially in the elderly [29]. Overall,
poor nutritional status is linked to worse outcomes in hospitalized COVID-19
patients, including mortality and length of hospital stay [28]; thus, identification of
risk and presence of malnutrition should be undertaken early during hospitalization
[29]. The use of scores such as mNUTRIC [30], NRS 2002 [31], and GLIM [32]is
recommended [29]; in particular, the ICU-validated mNUTRIC correlates well with
28]
28-day mortality in the critically ill [
Based on practical
guides and expert statements, nutritional management in
.
COVID-19 patients should mainly follow international guidelines. Despite large
debate about the “atypicality” of COVID-19-related ARDS, management and outcomes seem to be very similar to the “typical” form of ARDS [33] and so should be
MNT, including management of non-intubated patients, caloric and protein targets,
provision of omega-3 FA, and EN during prone position. However, some specific
features need to be addressed [29, 34].
As p
usly mentioned, immunity and inflammation are largely involved in the
revio
development of clinical manifestations, especially the most severe ones. On the one
hand, an appropriate nutritional status is necessary to optimally support an activated
immune system, with increased energy demands, while on the other hand it can help
regulate the process avoiding the overactivation of the inflammatory response. Viral
infections are characterized by a compromised immune function and deficient
micronutrient stores, particularly those involved in the immune system homeostasis,
such as vitamins A (the so-called “anti-infective” vitamin), D, and E, and trace
elements, including zinc, iron, selenium, magnesium, and copper [35]
ow levels of
. L
these components have been associated with adverse outcomes during viral infection
and, during the first outbreak in China their supplementation, together with omega-3
FA, was proposed [36]. While the European Society of Clinical Nutrition and
Metabolism (ESPEN) micronutrient guidelines highly encourage prevention and
treatment of micronutrient deficiencies, they do not support their routine use,
based on the lack of evidence that supraphysiologic and supratherapeutic amounts
may improve clinical outcomes [37]
owever, in a 2020 practical guidance for
. H
nutritional management of individuals with COVID-19 infection, ESPEN suggested
that provision of daily allowances for vitamins and trace elements be ensured to
malnourished patients at risk for or with COVID-19, aiming at maximizing general
anti-infection nutritional defenses [29].
Finally,
transmission through aerosol and droplets is now well demonstrated, and
feeding tube placement and gastric residual volume measurement are aerosolgenerating procedures, through which the SARS-CoV-2 virus is spread. Therefore,
these procedures should follow strict protection protocols, and despite being enteral
the preferred route, some authors even discourage jejunal tube placement in case of
gastric intolerance, favoring PN as a safer alternative [34].

20 Nutrition in ARDS, COVID-19, and ECMO 223
Nutrition in ECMO Support
ECMO is a form of temporary mechanical support for refractory cardiorespiratory
failure. It represents a bridge to recovery, in the acute phase of an illness, as well as a
long-term support, like in patients waiting for transplantation. The venous-venous
(VV) configuration both draws and pumps back venous blood through a central vein
to add oxygen and remove carbon dioxide, providing only respiratory support.
Venous-arterial (VA) ECMO also vicariates cardiovascular function, draining
blood from a central vein and returning it into a central or peripheral artery. Because
of the extracorporeal flow of blood and its contact with the foreign circuit elements,
anticoagulation is needed to prevent platelets and coagulation activation [38].
Patients managed with ECMO represent a cohort of severe critically ill patients,
in whom providing good nutritional support becomes even more complicated for the
following reasons:
1. A major hypermetabolic state, with enhanced protein catabolism, in the context of
prolonged ICU stay and in addition to an underlying disease [39].
2. Given the severity of the condition, feeding may be perceived as secondary, and
at the moment, Extracor poreal Life Support Organization (ELSO) guidelines do
not contain speci fic indications about MNT [38].
Moreover, perceived barriers to nutrition, together with some adjunctive specific
considerations, have been reported.
Enteral Nutrition
Concerning EN, clinicians have long been reluctant towards early feeding because of
high risk of enteral intolerance due to severe hypoxemia, cardiovascular instability,
steroids, vasoactive drugs, and long-term sedation, often with neuromuscular
blockage.
In fact, observational studies show that early (<48 h) EN, alone or in combination
with PN, is feasible in up to 80% of patients [40]. It does not seem to increase the risk
of adverse events, like aspiration pneumonia and diarrhea, compared to non-ECMO
patients. Importantly, the incidence of bowel ischemia in these studies is low
(0.3–0.7%) [40, 41 ].
One study found a high prevalence of mesenteric ischemia in refractory shock
undergoing VA-ECMO support, but a negative relationship between mesenteric
ischemia and early EN [42].
Overall, early EN appears to be safe, in the presence of close surveillance and
feeding initiation once the initial stabilization is complete [41].
Inspite of
with prokinetics, and energy goals were reached in more than 70% of cases with EN
alone or in combination with PN [40, 43].
high enteral intolerance incidence (38–53%), this was treated safely

224 L. Moretto et al.
Of note, a mortality advantage was found for early versus late EN initiation,
whether substrate targets were fulfilled or not [40, 43].
Early EN in ECMO is therefore suggested, once the early phase of clinical
instability is over, and the same indications about EN intolerance—such as
prokinetics and post-pyloric feeding—apply as for non-ECMO patients [2, 13, 44].
Parenteral Nutrition
The risk of gastrointestinal bleeding in the anticoagulated ECMO patient may
contraindicate or discourage clinicians from enteral tube placement, although no
guidelines establish precise coagulation parameters cut-offs. Possible alternatives
may be tube placement before anticoagulation starts or once the bleeding risk is
resolved and total PN [
Specific concerns about PN also exist, mainly regarding its suppos ed influence on
the circuit, and vice versa. It seems that the concomitant use of intravenous lipid
emulsions and ECMO may damage circuit elements, causing clogging of the
membrane and clot formation [39]. Therefore, German guidelines suggest administering PN not directly into the ECMO circuit but through a dedicated central venous
line, and giving intravenous lipids by continuous infusion, as opposed to boluses
[45]. Guidelines not only admit PN during ECMO but advocate it when unresolving
enteral tolerance puts the patient at risk of iatrogenic malnutrition [2, 13, 44].
39].
Specific Clinical Conditions: Gastrointestinal Bleeding,
Positive Fluid Balance, and Feeding Interruptions
Not even ischemia-related hepatitis or hyperbilirubinemia in the context of
hypoperfusion, both common in VA-ECMO, should prevent clinicians from starting
parenteral support when needed, because PN-related liver dysfunction is associated
only with long- term PN and overfeeding.
nal n
Additio
We already pointed out the concerns about the risk of gastrointestinal bleeding
[39]. The same issues about fluid balance as in ARDS are found in this cohort: a
positive fluid balance is linked to worse outcomes whereby feeding restriction
strategies are often adopted. A higher risk of nutrition inadequacy was highlighted
in VA-ECMO especially [40, 41]. Another aspect is that ECMO patients often
experience diet stops on occasion of various procedures related to their severe
conditions (e.g., bronchoscopy, surgery, imaging) [41]
Given such
appropriate goals and monitor their correct achievement, taking into account the
stops.
utritional risk also comes from contingency-specific characteristics.
.
a high nutritional and diet inadequacy risk, it is essential to establish

20 Nutrition in ARDS, COVID-19, and ECMO 225
Nutritional Goals
IC implementation to measure REE was deemed impossible during ECMO support.
Two studies addressed the problem and eventually demonstrated IC applicability.
The first one proposed the “Measuring Energy Expenditure in ECLS Patients
(MEEP) protocol,” consisting of adding to the IC-measured REE of the natural
lung the contribution of mem brane lung, calculated through weir equation (VO
resulting from the pre- and post-oxygenator difference in PO2 and PCO2,
VCO
2
times ECMO blood flow) [
46]. The other group added the calorimeter directly to the
oxygenator [47]. These approaches hold some advantages as well as drawbacks: in
the first case, high technical feasibility goes along with the fact that blood gas
analysis of the circuit is a punctual measurement, which may not reflect REE; in
the second case, the stability of the results copes with the cumbersomeness of the
procedure. Moreover, both techniques need validation.
Interestingly, these studies also point out that classical predictive equations, like
Harris-Benedict’s, over- and underestimate REE in ECMO patients (both VA and
VV). This may be because the increasing levels of support reduce patients’ oxygen
consumption and/or REE varies according to the disease phase [47]. Current guidelines do not supply specific indications, but given these results, IC may be considered the gold standard and, if not available, caloric targets may be estimated with the
body weight-based formula of 25 kcal/kg/day.
Moving on to protein goals, general indications apply [2, 13], but as previously
said, there is some evidence that patients on ECMO develop an exceptionally serious
catabolic state. Two studies suggested that guideline targets could not meet their
high protein requests, especially for obese patients [48]. How increasing the protein
supply would impact the outcome is not known, but adjusting the protein supply to
nitrogen balance is suggested [2, 13].
Lastly, drug sequestration in ECMO circuits is a well-known phenomenon, with
changes in drug pharmacokinetics. This has raised concerns about the hypothesis
that plasma levels of nutrients and trace elements may undergo alterations due to the
circuit elements themselves. One study found that some micro- and macronutrients,
such as vitamins A and E as well as some amino acids, may bind to membrane
oxygenator and tubing [49]. However, this was not con firmed in a subsequent
analysis [50]. Both studies were ex vivo experiments with limitations, and guidelines
do not recommend any specific nutrient supplementations [37].
2
and
Conclusions
ARDS management, including the most severe forms undergoing ECMO support,
should include a comprehensive approach to assess the patient nutritional status by
clinical assessment, laboratory biomarkers, validated scores on outcome prediction,
and calorimetry to guide as earlier as possible MNT. The COVID-19 pandemic

226 L. Moretto et al.
clearly highlighted that clinical nutrition must be fully considered part of a medical
therapy that may influence the course of illness. To achieve the right nutritional
support, especially in a critical care setting, optimal adherence to guidelines and
knowledge of these conditions—including patients’ comorbidities and frailty—are
needed, as they may improve relevant clinical outcomes, like mortality and longterm quality of life.
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Chapter 21
Nutrition in Trauma and Burns
Carmine Iacovazzo, Silvia Paganini, and Michela Rauseo
Introduction
Trauma and burn patients are a heterogeneous group characterized by severe catabolism and a hypermetabolic state: even more that in other patient groups, adequate
assessment of nutritional needs is essential in the management of these conditions.
Nutrition support is supposed to play a key role in mitigating the stress response and
supporting the increased metabolic needs, with the final aim of preventing
malnutrition.
The severe pathophysiological stress reaction associated with trauma and burn
induces a hypermetabolic state that can result in life-threatening malnutrition,
injury
loss of lean muscle mass, delayed wound healing, and increased susceptibility to
infection. Metabolic derangement in trauma and burns are of different degree and
duration but share the same underlying mechanism: metabolic, hormonal, and
inflammatory dysregulation.
Supplementary Information The online version contains supplementary material available at
https://doi.org/10.1007/978-3-031-66541-7_21.
C. Iacovazzo
Anesthesia and
Odontostomatological Science, University of Naples “Federico II”, Naples, Italy
e-mail: carmine.iacovazzo@unina.it
S. Paganini
SC
Rianimazione e Anestesia, ASST Ovest Milanese, Ospedale Civile di Legnano, Legnano,
Italy
e-mail: silvia.paganini@asst-ovestmi.it
M. Rauseo (
Department of Medical and Surgical Science, Anesthesia and Intensive Care Unit, University
Hospital Policlinico Riuniti di Foggia, University of Foggia, Foggia, Italy
e-mail: michela.rauseo@unifg.it
© The Author(s), under exclusive license to Springer Nature Switzerland AG 2024
A. Cotoia et al. (eds.), Nutrition, Metabolism and Kidney Support,
https://doi.org/10.1007/978-3-031-66541-7_21
Intensive Care, Department of Neuroscience, Reproductive Science and
✉)
229
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