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Updated: Aug 8, 2026

Manual Muscle Testing: A Method of Measuring Extremity Muscle Strength Applied to Critically Ill Patients
Published on: April 12, 2011
Muscle weakness in critically ill children
B L Banwell1, R J Mildner, A C Hassall
1Department of Pediatrics, Hospital for Sick Children, Toronto, Ontario, Canada. brenda.banwell@sickkids.ca
Insights
Muscle weakness affects 1.7% of critically ill children, often persisting long-term. Pediatric intensive care unit (ICU) survivors, particularly transplant recipients, face a significant risk of this condition.
Area of Science:
- Pediatric Critical Care Medicine
- Neuromuscular Disorders
- Intensive Care Unit (ICU) Outcomes
Background:
- Muscle weakness is a potential complication in critically ill pediatric patients.
- Understanding the incidence and risk factors is crucial for improving patient outcomes.
Purpose of the Study:
- To determine the frequency of generalized muscle weakness in children admitted to a pediatric intensive care unit (ICU).
- To identify potential risk factors and long-term consequences of muscle weakness in this population.
Main Methods:
- Prospective study involving 830 children (3 months to 17 years 11 months) admitted to a pediatric ICU for over 24 hours.
- Neuromuscular examinations were conducted.
- Data on clinical course, treatments, and outcomes were collected.
Main Results:
- Generalized muscle weakness was identified in 1.7% (14 of 830) of patients.
- Weakness was associated with failed extubation, multiple organ dysfunction, and sepsis.
- Solid organ or bone marrow transplant recipients represented a significant proportion of affected children (8 of 14).
- Muscle biopsy revealed acute quadriplegic myopathy in examined patients.
- Persistent weakness was observed in survivors for 3 to 12 months post-ICU discharge.
Conclusions:
- Muscle weakness is an infrequent yet significant complication of critical illness in children.
- Pediatric ICU patients, especially transplant recipients, are at heightened risk.
- Early identification and management strategies are warranted to mitigate long-term functional deficits.
Objective:
To establish the incidence of muscle weakness in critically ill children.
Methods:
Neuromuscular examinations were performed in 830 children without identified antecedent or acute neuromuscular disease (age 3 months to 17 years 11 months) admitted for >24 hours to a pediatric intensive care unit (ICU) over a 1-year period.
Results:
Fourteen of 830 (1.7%) patients had generalized weakness. Four failed repeated attempts to extubate. Multiple organ dysfunction occurred in 11 patients and sepsis in 9. Most children received corticosteroids, neuromuscular blocking agents, or aminoglycoside antibiotics. Eight of the 14 children were solid organ or bone marrow transplant recipients. Muscle biopsy showed evidence of acute quadriplegic myopathy in all three patients in whom biopsy was performed. Three patients died. In survivors, significant weakness persisted for 3 to 12 months following ICU discharge.
Conclusions:
Muscle weakness is an infrequent but significant feature of critical illness in children. Transplant recipients seem to be at particular risk.
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