GE Healthcare GE DINAMAP SuperSTAT Algorithm - Manual (Page 4)

4
In Figure 2, the target pressure is set to 120 mmHg, which is
significantly below the systolic pressure. After five deflation
steps, the algorithm repumps to a higher pressure (P
r
). By
combining the data from the initial inflation and the repump,
the GE DINAMAP SuperSTAT algorithm is able to obtain the
determination in slightly over 40 seconds.
Changing default target
inflation pressures
The default target inflation pressures for adult, pediatric and
neonatal cuff types in the Solar monitor can be accessed
from the host MAIN MENU by selecting MORE MENUS >
MONITOR SETUP > MONITOR DEFAULTS > SETUP DEFAULT
DISPLAY
and scrolling down the list of defaults. This will reset
the default target pressure for all subsequent admissions.
For more complete information, please refer to the Solar
monitor’s operators manual.
The target inflation pressure for an individual patient can be
changed upon admission by selecting INITIAL INFLATION
PRESSURE
from the NIBP menu. This opens a popup
window, which allows selection of target pressure in 5 mmHg
increments. For adult and pediatric cuff sizes, the range
of pressures is 100 mmHg to 250 mmHg. The cuff will be
inflated to the value indicated by the INITIAL INFLATION
PRESSURE
softkey only when a previous systolic value is not
known or could not be obtained. (See Adaptive Inflate.) Upon
admission of a new patient, the target pressure will revert to
the default.
Higher defaults used with acquisition products containing
the Classic algorithm should not be carried forward when
upgrading host software for use with products containing the
GE DINAMAP SuperSTAT algorithm.
For changing target inflation pressures in the Dash or
CARESCAPE V100 monitors, refer to the appropriate
operators manual.
Adaptive inflate
In AUTO MODE, the target inflation pressure is determined
from the previous systolic value. In the GE DINAMAP
SuperSTAT algorithm, the adaptive inflate is 10 mmHg above
the previous systolic value. This allows the CARESCAPE
Patient Data Module to adjust the inflation pressure as the
patient’s condition changes. If the patient’s blood pressure
changes rapidly, for example, a hypertensive patient whose
blood pressure drops suddenly after intubation, returning to
the set target pressure can improve performance. This can
be accomplished by selecting CLEAR NBP READING from the
NBP menu.
Figure 2 - Repump Sequence with GE DINAMAP SuperSTAT
Algorithm (BP = 147/87)
This behavior can be contrasted with the earlier Classic
algorithm, as shown in Figure 3. With P
t
= 120 mmHg, the
Classic algorithm requires more deflation steps before
starting a repump. In addition, the repump pressure is higher
(178 mmHg) and the algorithm completes a full determination
sequence before obtaining the blood pressure (141/82) in
60 seconds. Unlike the GE DINAMAP SuperSTAT algorithm,
the Classic algorithm does not use the data from the initial
inflation sequence. The Classic algorithm in the Tram
® also
requires a higher target inflation pressure (160 mmHg).
Figure 3 - Repump Sequence with Classic Algorithm
(BP= 141/82)
P t = 120 mmHg
P
t
= 168 mmHg
0 60 20 40
180
120
60 Cuff Pr
essur
e (mmHg)
Time (seconds)
P
t
= 178 mmHg
P
t
= 120 mmHg
0 60 20 40
180
120
60 Cuff Pr
essur
e (mmHg)
Time (seconds)