Real-time recording of simulated left
ventricular pressures demonstrate the many
advantages of Mikro Tip pressure catheters.
Fluid Filled Catheters - Disadvantages
–Catheter
Stiffness:
Increased compliance leads to a loss in
pressure
–Length:
Increased length results in poor frequency
response
–Air
bubbles form over time and with temperature
changes.
–Signal
transmission reduced by increased fluid
volume.
–Sensitive
to movement artifact.
Fluid-filled sensors can be affected by
hydrostatic pressure & transducer should be at
the same level as the catheter tip.
Millar catheters are position independent
Frequency response of the Millar catheter is
flat to 10kHz. Most other catheters tend to
display resonance distortions at 10-20Hz.
Millar catheters are easy to use - No fluid
lines to de-bubble during setup
No signal attenuation in Millar catheters that
occurs commonly in fluid-filled catheters.
Millar catheters record pressure changes
directly at the source NOT at a distance.
