Compute P0.1

[RobertLRead]

From: Assessing effort and work of breathing
Giacomo Bellani and Antonio Pesenti

"Several other methods to measure or estimate the
breathing effort circumventing the use of Pes have
been described, and P0.1 (i.e. the airway pressure
drop in the first 100 ms) against an occluded airway
is probably one of the more robust and broadly used
[31], at least partly because it is readily available on
most commercial mechanical ventilators"