Above what pressure-time index (PTI) will most patients be unable to sustain spontaneous breathing?
a. 0.03
b. 0.05
c. 0.10
d. 0.15
ANS: D
A PTI greater than 0.15 to 0.18 has been associated with diaphragmatic fatigue, and a PTI great-er than 0.15 cannot be sustained indefinitely.
Health Professions
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