This single-center, prospective, randomized controlled trial aims to evaluate whether an eCASH concept-based analgesia and sedation strategy combined with early goal-directed mobilization can reduce the incidence of intensive care unit-acquired weakness (ICU-AW) in mechanically ventilated ICU patients. A total of 70 adult patients receiving invasive mechanical ventilation will be randomly assigned in a 1:1 ratio to either the intervention group or the control group. The intervention group will receive routine ICU nursing care plus an eCASH-based analgesia and sedation strategy combined with early goal-directed mobilization, while the control group will receive routine ICU nursing care. The primary outcome is the incidence of ICU-AW. Secondary outcomes include total doses of remifentanil and midazolam, respiratory function after extubation, duration of mechanical ventilation, and adverse events.