Symptoms
- ■ Profound generalized limb weakness detected on awakening from sedation (MRC sum score <48)
- ■ Difficulty weaning from mechanical ventilation due to respiratory muscle weakness
- ■ Inability to perform simple tasks like lifting an arm or leg against gravity
- ■ Absent or reduced deep tendon reflexes suggesting peripheral nerve involvement
- ■ Persistent fatigue, functional limitation, and cognitive difficulties persisting months after ICU discharge
Causes
- ■ Prolonged immobilization in bed causing rapid muscle protein catabolism and atrophy
- ■ Systemic inflammatory response syndrome (SIRS) from sepsis causing nerve and muscle toxicity
- ■ Neuromuscular blocking agents and high-dose corticosteroids causing direct muscle damage
- ■ Microcirculatory dysfunction reducing oxygen and nutrient delivery to peripheral muscles and nerves
- ■ Hyperglycaemia and metabolic disturbances during critical illness impairing neuromuscular function
Diagnosis
- ■ Medical Research Council (MRC) Sum Score: testing 6 muscle groups bilaterally; score <48/60 defines ICUAW
- ■ Handheld dynamometry to quantify grip strength and limb muscle force
- ■ Electromyography (EMG) and nerve conduction studies to classify critical illness myopathy vs. polyneuropathy
- ■ Functional mobility assessment (ICU Mobility Scale, CPAX) to grade ambulation capacity
* Evidence-Based Interventions
Clinical
Approaches
Early ICU Mobilization
Structured daily progression from passive movement to sitting, standing, and stepping in the ICU.
Respiratory Rehabilitation
Inspiratory muscle training, breathing exercises, and assisted cough techniques for ventilator weaning.
NMES Therapy
Electrical stimulation of quadriceps and other major muscles during sedation to preserve muscle mass.
Progressive Strength Training
Post-ICU structured resistance program to rebuild muscle strength and endurance.
🏠 Home Exercises Guide
Strengthen your recovery. Perform these exercises strictly under pain-free limits:
📋 Execution Blueprint: Passive Limb Cycling (In-bed)
- 1Position the patient in semi-reclined bed position with legs supported.
- 2Attach in-bed cycle ergometer to feet for passive cycling if patient cannot actively participate.
- 3Begin with 10-20 minutes of passive cycling at low resistance.
- 4Progress to active-assisted cycling as patient's awareness and limb movement improves.
- 5Perform once or twice daily as tolerated to maintain limb circulation and joint range.
* FAQs
Common Questions
Yes, early mobilization in ICU patients who meet safety screening criteria (adequate cardiovascular and respiratory stability) is safe and beneficial. Evidence consistently shows it shortens ICU and hospital length of stay.
Critically ill patients can lose up to 2% of muscle mass per day during ICU admission. This is 10 times faster than normal aging-related muscle loss, making early physiotherapy essential.
The ICU Mobility Scale (IMS) grades patient mobility from 0 (passive range of motion only) to 10 (independent ambulation). It is used daily to track mobilization progress and guide escalation of exercise intensity.
Yes, neuromuscular electrical stimulation (NMES) can be applied to quadriceps and other muscle groups even during deep sedation to maintain muscle mass and prevent atrophy during periods when active participation is not possible.
Post-ICU Syndrome (PICS) describes a constellation of physical weakness, cognitive impairment, and psychological distress (PTSD, anxiety, depression) that persists after ICU discharge. Comprehensive rehabilitation addressing all three domains is essential.
Recovery varies greatly with severity. Mild ICUAW may resolve within weeks to months after discharge. Severe cases, particularly with critical illness polyneuropathy, may take 1-2 years and some residual weakness may persist long-term.
Absolutely. We actively involve families in range of motion exercises, positioning, and motivational support. Family-led exercises with physiotherapy training significantly increases the frequency of therapeutic movement during ICU admission.
Yes, respiratory muscles including the diaphragm and intercostals are affected by ICUAW, causing difficulty breathing independently and delaying ventilator weaning. Inspiratory muscle training is a key component of our ICU physiotherapy program.
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Recovery Today*
Comprehensive clinical assessment within 48 hours.
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Includes clinical check, analysis, and personal recovery planning for ICU-Acquired Weakness under Dr. Karolin Rockson, PT (BPT), Ex. CMC - Vellore.
Verified Author Protocol
Dr. Karolin Rockson, PT (BPT), Ex. CMC - Vellore
Board: Indian Association of Physiotherapists (IAP)
Reg No: PT-84729