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Ultrasound images of the rectus abdominis muscle. The muscle thickness (yellow diamond) was measured at the end-inspiration and perpendicular to the inner side of the muscle fasciae. A: on the first day of mechanical ventilation; B: on day 48, when the patient was weaned from mechanical ventilation but decannulation was unsuccessful; C: on day 89, when decannulation was successful. The probe is located approximately 2 cm above the umbilicus and 2–3 cm lateral from the midline.
