A vital capacity (VC) value below what value indicates significant muscle weakness?
a. 10 to 15 ml/kg
b. 20 to 25 ml/kg
c. 30 to 40 ml/kg
d. 50 to 60 ml/kg
ANS: A
A VC less than 10 to 15 ml/kg indicates considerable muscle weakness, which may inhibit the ability to breathe spontaneously.
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