Early Mobilization of Mechanically Ventilated Adults in the Intensive Care Unit: A Comprehensive Narrative Review of Clinical Efficacy, Multidisciplinary Implementation, Safety, and Translational Challenges

AbstractBackground Invasive mechanical ventilation is among the most common life-sustaining interventions in the intensive care unit, yet its survivors carry a substantial and durable burden of ICU-acquired weakness and long-term physical disability. Because immobility is a readily modifiable contributor to this morbidity, early mobilization (EM) was rapidly adopted into critical-care bundles and professional guidelines on the strength of early single-centre trials suggesting it was feasible, safe, and functionally beneficial. Subsequent large multicentre randomized trials have, however, largely failed to reproduce these benefits and the largest reported a signal of harm, leaving clinicians to reconcile divergent evidence when deciding how, when, and for whom EM should be delivered. Objective To integrate the clinical, safety, and implementation evidence on early mobilization (EM) of mechanically ventilated adults, reconciling the substantial benefits reported by single-centre and quality-improvement (QI) studies with the neutral findings of large multicentre randomized trials, and to derive an evidence-aligned framework for practice and health-system reform. Methods An integrative review reported per the SANRA framework searched PubMed/MEDLINE, Embase, CINAHL, and the Cochrane Library for randomized controlled trials (RCTs), systematic reviews, meta-analyses, cohort and QI studies, guidelines, and consensus statements, appraised for design, bias, and consistency and synthesized narratively. Results Single-centre trials and QI programmes report marked reductions in ventilation duration, ICU-acquired weakness, and length of stay (Schweickert et al., 2009; Zhou & Zhang, 2022), yet the largest multicentre RCT found no improvement in days alive and out of hospital and more adverse events (TEAM Study Investigators, 2022), and meta-analysis links EM to greater strength and independent walking but not to lower mortality or length of stay (Tipping et al., 2017). EM is broadly safe within consensus criteria (Hodgson et al., 2014), is most effective within the ABCDEF bundle (Pun et al., 2019), and depends on multidisciplinary teamwork; implementation is constrained by knowledge, staffing, sedation, cultural, and structural barriers (Dubb et al., 2016). Conclusions EM is safe and likely improves strength and short-term function but does not reliably reduce mortality, length of stay, or ventilation duration. Delivered within a bundled, protocolized, multidisciplinary, safety-governed framework, it remains a high-value component of critical-care rehabilitation and a priority for systems pursuing quality transformation. Keywords: early ambulation; critical care; mechanical ventilation; intensive care units; ICU-acquired weakness; rehabilitation