Fluke Biomedical medSim 300B - Manual (Page 129)

Option 1
Intra-Aortic Balloon Pump (IABP) Augmentation
4
4-31
Intra-Aortic Balloon Timing
Characteristics—normal inflation, early inflation, late inflation, early deflation and late
deflation—of the medSim 300B balloon timing simulations are illustrated below.
These examples show the medSim 300B responses to an IABP assist ratio of 1:2 in which
every second pressure waveform is augmented.
Normal Inflation
Dicrotic Notch Inflation Deflation
Assist Ratio = 1:2
Unassisted
Waveform Assisted
Waveform
eic205.eps
Figure 4-25. medSim 300B Simulated Normal Waveform with the IABP Properly Set
• Inflation begins at the dicrotic notch (the small increase on the downslope of the
arterial waveform that is caused by the closure of the aortic valve).
• Deflation ends just before the next arterial pressure waveform.
Early Inflation
Dicrotic Notch Inflation Deflation
Assist Ratio = 1:2
Unassisted
Waveform Assisted
Waveform
eic206.eps
Figure 4-26. medSim 3008 Simulated Early Balloon Inflation
• Inflation begins prior to the dicrotic notch (aortic valve closure).
• Deflation ends just before the next arterial pressure waveform.
Note
The dicrotic notch is not visible because balloon inflation occurs prior to
the aortic valve closure.