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Ultrasound muscle assesses the rectus femoris cross-section area (A–D), the thickness of the anterior compartment of the quadriceps muscle (rectus femoris and vastus intermedius) (E–H), and rectus femorisechogenicity (I–L). aP < 0.05 vs patients without IMV on day 1; cP < 0.05 vs day 1.
