LTV 1100 Operator Manual - CareFusion

Test Lung Operations
Symptoms Possible Causes What to Do
Delivered pressure
higher than set
pressure on test lung.
Monitored volumes
very high on test lung.
Pressure> 40 cmH 2 O used
on small test lung
(CareFusion or Siemens
190.)
Test lung with small
aperture connected directly
to wye.
Very small ET tube
connected directly to wye.
The compliance characteristics of some
small test lungs (CareFusion or Siemens
190) cause incorrect readings when high
pressures are used. For these lungs, use
pressures under 40 cmH 2 O or change to a
larger lung.
Some test lungs have a narrow opening or
a restrictor, which may cause jetting and
cause the flow differential to be read
incorrectly. To reduce the jetting effect,
add a short extension between the test
lung and the wye.
A very small ET tube connected directly to
the wye may cause jetting and cause the
flow differential to be read incorrectly. To
reduce the jetting effect, add a short larger
bore extension between the ET tube and
the wye.
21106-001 Rev. E Operator’s Manual - LTV ® 1100 Ventilator 15-25