III. Purging Air from the Monitoring Line
Take care to ensure no air is trapped in any components of the fluid pathway. The monitoring
system must be totally air-free for maximum performance, i.e., optimal dynamic response.
G. Pressurize the I.V. solution source to 300 mmHg. Close clamp on pressure cuff.
8‐6 Monitoring Invasive Blood Pressure
Insert the I.V. solution bag into the pressure administration cuff.
Hang the pressure administration cuff from an MR I.V. pole.
With the administration set clamp closed, gently squeeze the drip
chamber and fill drip chamber approximately 1/2 full.
Open clamp on administration set.
Attach the transducer to an MR IV pole mount.
Turn zero reference stopcock "off" to patient. Remove white vented cap from the side port
of the zero reference stopcock.
Activate fast flush mechanism of the continuous flush device and fill transducer slowly
(gravity prime only) until air‐free. Flush fluid through transducer and side port of stopcock.
Turn handle of zero reference stopcock "off" to its side port. Place a yellow non‐vented cap
onto the side port of the stopcock.
Repeat priming steps B–D for any additional stopcocks.
Remove white cover at patient connector and flush the rest of the patient line. Place a
yellow non‐vented cover onto the patient connector.
Make certain the drip chamber does not completely fill during pressurization. Air should
remain in the drip chamber so that the continuous flush rate can be verified following a fast
Pulling a vacuum to purge bubbles from the lines is not recommended. This practice may
entrain air or release air from solution. If the line is primed in a forward manner under
pressure, care must be taken to assure the maximum pressure specifications for the
transducer are not exceeded.
Expression MR400 Instructions for Use