Boston Scientific Precision SC-1110 Serie Manual De Uso página 74

Precision™ System Clinician Manual
3. Calculate the Total-Weighted Pulse Width
(TWPW) by adding the rate weighted
pulse widths.
TWPW = RWPW1 66.67 + RWPW2
266.667
TWPW = 333.33 micro seconds
4. Determine the area with the largest
amplitude
Largest amplitude = 8.0 mA
5. Use TOTAL RATE, TWPW, and largest
amplitude in the chart to determine the
battery-longevity projection.
The closest values on the table using 90 Hz,
333.33 micro seconds, and 8.0 mA is found
in the box associated with 90 Hz, 330 micro
seconds, and 8.0 mA. The result is a battery-
longevity projection of more than 25 years.
Multiple-Area Battery Longevity
Worksheet Example 2
In this example, three stimulation areas are
used with the following settings:
Area 1: Amplitude = 6 mA, Rate = 120 Hz,
PW = 200 micro sec
Area 2: Amplitude = 4 mA, Rate = 120 Hz,
PW = 400 micro sec
Area 3: Amplitude = 8 mA, Rate = 100 Hz,
PW = 300 micro sec
1. Calculate the TOTAL RATE (TR) of
the stimulation frequencies by adding
together the rate from each area that is
used:
TOTAL RATE = Rate 1 120 Hz + Rate 2
120 Hz + Rate 3 100 Hz
TOTAL RATE = 340 Hz
Clinician Manual
9055959-008 Rev A 72 of 327
2. Calculate the Rate Weighted Pulse
Width (RWPW) for each area used by
multiplying the pulse width value for each
area used by the Rate of that area and
then dividing the result by the TOTAL
RATE that was previously calculated.
RWPW1 = PW1 x Rate 1/ TOTAL RATE =
(120 x 200)/340 = 70.58
RWPW2 = PW2 x Rate 2/ TOTAL RATE =
(120 x 400)/340 = 141.17
RWPW3 = PW3 x Rate 3/ TOTAL RATE =
(100 x 300)/340 = 88.23
3. Calculate the Weighted Total-Weighted
Pulse Width (TWPW) by adding the rate
weighted pulse widths.
TWPW = RWPW1 70.58 + RWPW2
141.17 + RWPW3 88.23
TWPW = 299.98 micro seconds
4. Determine the area with the largest
amplitude
Largest amplitude = 8.0 mA
5. Use TOTAL RATE, TWPW, and largest
amplitude in the chart to determine the
battery-longevity projection.
The closest values on the table using 340 Hz,
299.98 micro seconds, and 8.0 mA is found
in the box associated with 340 Hz, 300 micro
seconds, and 8.0 mA. The result is a battery-
longevity projection of 8.0 years.
Multiple-Program Longevity Worksheet
Quick Method:
If multiple programs are routinely used,
determine the battery-longevity projection
for each program using the methods
mentioned above (including the 'Multiple-Area