When is respiratory muscle fatigue likely to occur?
a. When VE exceeds 20% of the maximum voluntary ventilation (MVV)
b. When VE exceeds 40% of the MVV
c. When VE exceeds 60% of the MVV
d. When VE exceeds 80% of the MVV
ANS: C
Comparing the spontaneous minute ventilation with MVV is a helpful index as fatigue and fail-ure are both likely to occur if the minute ventilation exceeds 60% of MVV.
Health Professions
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