• Greet Hermans, Michael P Casaer, Beatrix Clerckx, Fabian Güiza, Tine Vanhullebusch, Sarah Derde, Philippe Meersseman, Inge Derese, Dieter Mesotten, Pieter J Wouters, Sophie Van Cromphaut, Yves Debaveye, Rik Gosselink, Jan Gunst, Alexander Wilmer, Greet Van den Berghe, and Ilse Vanhorebeek.
• Medical Intensive-Care Unit, Department of General Internal Medicine, University Hospitals Leuven, Leuven, Belgium; Laboratory of Intensive-Care Medicine, Division of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium.
• Lancet Respir Med. 2013 Oct 1;1(8):621-9.

BackgroundPatients who are critically ill can develop so-called intensive-care unit acquired weakness, which delays rehabilitation. Reduced muscle mass, quality, or both might have a role. The Early Parenteral Nutrition Completing Enteral Nutrition in Adult Critically Ill Patients (EPaNIC) trial (registered with ClinicalTrials.gov, number NCT00512122) showed that tolerating macronutrient deficit for 1 week in intensive-care units (late parenteral nutrition [PN]) accelerated recovery compared with early PN. The role of weakness was unclear. Our aim was to assess whether late PN and early PN differentially affect muscle weakness and autophagic quality control of myofibres.MethodsIn this prospectively planned subanalysis of the EPaNIC trial, weakness (MRC sum score) was assessed in 600 awake, cooperative patients. Skeletal muscle biopsies, harvested from 122 patients 8 days after randomisation and from 20 matched healthy controls, were studied for autophagy and atrophy. We determined the significance of differences with Mann-Whitney U, Median, Kruskal-Wallis, or χ(2) (exact) tests, as appropriate.FindingsWith late PN, 105 (34%) of 305 patients had weakness on first assessment (median day 9 post-randomisation) compared with 127 (43%) of 295 patients given early PN (absolute difference -9%, 95% CI -16 to -1; p=0·030). Weakness recovered faster with late PN than with early PN (p=0·021). Myofibre cross-sectional area was less and density was lower in critically ill patients than in healthy controls, similarly with early PN and late PN. The LC3 (microtubule-associated protein light chain 3) II to LC3I ratio, related to autophagosome formation, was higher in patients given late PN than early PN (p=0·026), reaching values almost double those in the healthy control group (p=0·0016), and coinciding with less ubiquitin staining (p=0·019). A higher LC3II to LC3I ratio was independently associated with less weakness (p=0·047). Expression of mRNA encoding contractile myofibrillary proteins was lower and E3-ligase expression higher in muscle biopsies from patients than in control participants (p≤0·0006), but was unaffected by nutrition.InterpretationTolerating a substantial macronutrient deficit early during critical illness did not affect muscle wasting, but allowed more efficient activation of autophagic quality control of myofibres and reduced weakness.FundingUZ Leuven, Research Foundation-Flanders, the Flemish Government, and the European Research Council.Copyright © 2013 Elsevier Ltd. All rights reserved.

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