Arrow AutoCAT 2 Series Operating Manual page 98

Setting Timing (Operator Mode):
The following steps will guide you through the timing process:
Confirm that the assist ratio is set on 1:2. This will allow you to compare assisted with
unassisted beats. If 1:2 is not selected, press the left or right arrow key in the ASSIST
RATIO section of the keypad, to select 1:2.
Adjust the inflation point:
• Depress the "LATE" > arrow of the inflate control key until you can clearly see the DN
on the AP waveform.
• Depress the < "EARLY" arrow of the inflate control key until the white overlay is at the
beginning of DN (40ms in front of DN) and the DN is no longer visible when pumping.
• Compare the AP waveform to Figure 4.2. Note the V-shaped curve between the SYS
and AUG peaks. AUG should be greater than SYS.
Do not continue to move the inflate point to the left, even to increase AUG further. Early inflation can
The operator must closely observe the effects of inflation timing on deflation timing whenever the settings
are altered. Failure to do so may adversely impact the expected benefits of counterpulsation and have
The operator should continuously monitor the patient's Arterial Pressure waveform whenever the deflation
Do not attempt to adjust timing based on ECG or Pacer waveforms. Inflation and deflation points
should be set based on the Arterial Pressure waveform. Monitor this waveform to achieve optimum
Adjust the deflation point:
• Depress the < "EARLY" arrow of the deflate control key to see its effect on the AP
waveform. Note the rise in Assisted SYS (early deflation).
• Depress the "LATE" > arrow of the deflate control key to lower Assisted SYS and
Assisted DIA. The white overlay should end just prior to the systolic upstroke. If
Assisted DIA starts to rise, depress the "EARLY" arrow of the deflate control key
to deflate earlier.
4 . P r i n c i p l e s o f T i m i n g a n d T r i g g e r i n g
WARNING
compromise systole.
WARNING
serious clinical sequelae.
WARNING
point is set beyond 100%.
WARNING
hemodynamic benefit.
4 . 4 : T i m i n g
Timing
4-13