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220 L. Moretto et al.
immunonutrition. Eventually, a 2019 Cochrane metanalysis of ten trials investigat­ing immunonutrition in ARDS reported only uncertain bene ts 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]. Signicant advantage instead seems to derive from the intravenous use of sh
oil (FO) emulsionswhich 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
inuence 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 rst and then EN should be considered, introducing PN only when the enteral route is inadequate or contraindicated [2, 13].
Specic 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 [ conrmed 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 uid restriction, it becomes necessary to avoid a harmful positive uid 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 benecial 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 identied 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].
Inammati the most severe cases, where multiple organ damage is attributable to uncontrolled inammation with massive pro-inammatory cytokine release [26].
Nutritional risk is highly prevalent in COVID-19 patients and its etiology is multifactorial. The inammatory response, and the subsequent hypermetabolic state, increases energy and protein needs. Disease severity, with a high systemic inammation 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 inammation, 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, identication 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 atypicalityof COVID-19-related ARDS, management and out­comes seem to be very similar to the typicalform 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 specic features need to be addressed [29, 34].
As p
usly mentioned, immunity and inammation 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 inammatory response. Viral infections are characterized by a compromised immune function and decient micronutrient stores, particularly those involved in the immune system homeostasis, such as vitamins A (the so-called anti-infectivevitamin), 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 rst 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 deciencies, 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) conguration 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 ow 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 c indications about MNT [38].
Moreover, perceived barriers to nutrition, together with some adjunctive specic 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 fullled 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 intolerancesuch as prokinetics and post-pyloric feedingapply 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 [
Specic concerns about PN also exist, mainly regarding its suppos ed inuence 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].
Specic 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 uid balance as in ARDS are found in this cohort: a positive uid 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-specic 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 rst 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 ow) [
46]. The other group added the calorimeter directly to the
oxygenator [47]. These approaches hold some advantages as well as drawbacks: in the rst case, high technical feasibility goes along with the fact that blood gas analysis of the circuit is a punctual measurement, which may not reect 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-Benedicts, over- and underestimate REE in ECMO patients (both VA and VV). This may be because the increasing levels of support reduce patientsoxygen consumption and/or REE varies according to the disease phase [47]. Current guide­lines do not supply specic 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 rmed in a subsequent analysis [50]. Both studies were ex vivo experiments with limitations, and guidelines do not recommend any specic 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 inuence the course of illness. To achieve the right nutritional support, especially in a critical care setting, optimal adherence to guidelines and knowledge of these conditionsincluding patientscomorbidities and frailtyare 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 nal 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 inammatory 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