ICU-Acquired Weakness: Diagnosis & Rehabilitation After Critical Illness
A clear guide to ICU-acquired weakness and critical illness polyneuropathy, muscle and nerve weakness that can develop after a prolonged critical illness.
Treatment usually begins with
Early Mobilisation
Physiotherapy
Nutritional Support
Structured Rehabilitation
Treatment focuses on early, structured physiotherapy and nutritional support, beginning as soon as it is safe during the ICU stay and continuing into recovery.
You may need this evaluated if...
Evaluation for this condition is considered when a patient recovering from critical illness shows:
- Significant muscle weakness after a prolonged ICU stay
- Difficulty moving limbs that were not directly injured
- Ongoing weakness after ventilator support is no longer needed
- Difficulty with basic movement or swallowing during ICU recovery
With structured, early rehabilitation, many patients regain significant strength and function over the weeks following critical illness.
What is ICU-Acquired Weakness & Critical Illness Polyneuropathy?
ICU-acquired weakness, including critical illness polyneuropathy and myopathy, is muscle and nerve weakness that can develop after a prolonged, severe critical illness, and structured rehabilitation is central to regaining strength and independence.
A Recognised Consequence of Critical Illness
Prolonged severe illness, ventilation and immobility can affect nerve and muscle function even after the original illness improves.
Early Movement Makes a Difference
Beginning physiotherapy as early as safely possible during the ICU stay improves long-term recovery.
Nutrition Supports Muscle Recovery
Adequate nutrition during and after critical illness plays an important role in regaining strength.
Recovery Continues Beyond the ICU
Rehabilitation often continues after discharge, with steady improvement over weeks to months.
Common Symptoms
- Generalised muscle weakness
- Difficulty moving arms or legs
- Difficulty weaning from the ventilator despite lung improvement
- Fatigue with minimal exertion
- Difficulty swallowing in some cases
What Increases Your Risk
A combination of underlying illness, injury and hospital-related factors can increase the likelihood of this condition.
How It Is Diagnosed
A structured critical care assessment confirms the diagnosis and guides the intensity of treatment needed.
Clinical Neurological Examination
Assesses muscle strength and pattern of weakness.
Nerve Conduction Studies
Distinguish nerve from muscle involvement where needed.
Functional Assessment
Evaluates your ability to perform basic movements and tasks.
Nutritional Assessment
Reviews nutritional status as part of the recovery plan.
Treatment Approaches
Intensive Medical & Organ Support
- Early, structured physiotherapy during and after the ICU stay
- Occupational therapy to support daily function
- Optimised nutrition to support muscle recovery
- Gradual, supervised increase in activity and strength training
Procedural & Surgical Critical Care
Surgery has no role in ICU-acquired weakness; recovery is achieved through structured, ongoing rehabilitation.
Treatment decisions in critical care are reviewed continuously against your organ function and response to treatment, not a fixed protocol.
Know When to Act
Recognising these signs early and acting promptly can prevent a condition from progressing to critical illness.
Book an Assessment
Schedule a consultation for a routine evaluation or ongoing concern.
- This condition is identified and monitored during ICU recovery and follow-up rehabilitation
Seek Urgent Care
Reach out for emergency care immediately if you notice any of the following.
- Significant new weakness in someone previously well should be discussed with the care team promptly
Not Sure What You Need?
Speak to a Care Guide and we'll help you coordinate the right critical care specialist or ICU transfer.
Talk to Care GuideA care guide can help coordinate your critical care consultation or ICU transfer.
Share your concern or existing reports. We will help you choose the right hospital, doctor and appointment.
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