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Interrater reliability of quantitative ultrasound measures of muscle in critically ill patients

Quantitative neuromuscular ultrasound is increasingly used to study muscle pathology and changes in muscle mass during critical illness. Advantages of ultrasound are high axial resolution, low procedural risks, no ionizing radiation, and ease of use early in the course of disease. However, ultrasound is known to be an operator dependent imaging modality and the intensive care unit setting poses additional challenges to obtaining reliable measurements. There is limited evidence validating the feasibility and reliability of its application in this setting.