What score on the MRC-SS is indicative of ICU-acquired weakness?

What score on the MRC-SS is indicative of ICU-acquired weakness?

• A. < 48/60
• B. > 60/60
• C. 48/60
• D. < 60/60

Answer: (A)

The MRC Sum Score measures overall muscle strength by grading six bilateral muscle groups (each 0–5), for a total of 60. When the total score falls below 48 out of 60, it reflects substantial generalized weakness consistent with ICU-acquired weakness. A score of 60 indicates normal strength, and scores at or above 48 do not meet the criterion for ICU-AW. This threshold (less than 48) is the established cutoff used to identify this condition in critically ill patients.

The MRC Sum Score measures overall muscle strength by grading six bilateral muscle groups (each 0–5), for a total of 60. When the total score falls below 48 out of 60, it reflects substantial generalized weakness consistent with ICU-acquired weakness. A score of 60 indicates normal strength, and scores at or above 48 do not meet the criterion for ICU-AW. This threshold (less than 48) is the established cutoff used to identify this condition in critically ill patients.