SBT and a brief US of the lung to screen big pleural effusions in most cases. ventilation is a condition that triggers physiological derangements and needs to be terminated as soon as possible.
In case of doubt, pull it out 😜

A kind of damped curve that looks like a cvp tracing might be a clue. Also I often see a loss of the „dicrotic“ wave. It also depends on the site of measurement, posture and intrathoracic pressures.