One lung ventilation & bronchial blocker guideline

Advance the scope into the bronchus, then advance the blocker over the bronchoscope.
You may need the vicryl loop a bit tighter than shown on the above picture.

Withdraw the bronchoscope but keep the balloon on the blocker in view, inflate the balloon under direct vision until it just occludes the bronchus & note the volume required.

When the blocker is confirmed as in the correct position, tighten the screw adapter to keep it secure & remove the vicryl loop by unscrewing the red & white cap from the proximal end of the blocker.

Lubricate tube v well, align blocker to blue line = posterior = large circumference side if ETT & pass through larynx under direct vision.
Blocker will advance easily but beware withdrawal is ‘sticky’ as vicryl loop will tend to catch.
Pass Bronchoscope into bronchus then advance blocker onto bronchoscope.
Position blocker in the same way as if it were intraluminal. 

Alternative CPAP system allowing measurement of CPAP

Connect green tubing to O2 (0.5 -1 lpm usually sufficient). Level 3 way tap with chest = 0 on scale of the ruler. ALWAYS have 3 way tap open to all ports, turn on O2 then fill open syringe barrel with saline to desired level of CPA