Boston Scientific Vercise DB-1110-C Manual página 83

Multiple-Area Battery Longevity Worksheet Example 1
In this example two stimulation areas are used with the following settings:
Area 1:
Amplitude = 3.0 mA, Rate = 130 Hz, PW = 60 µs
Area 2:
Amplitude = 3.0 mA, Rate = 185 Hz, PW = 90 µs
1. Calculate the TOTAL RATE (TR) of the stimulation frequencies by adding together
the rate from each area that is used:
TOTAL RATE = Rate 1 130 Hz + Rate 2 185 Hz
TOTAL RATE = 315 Hz
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
= (60 x 130)/315 = 24.76
RWPW2 = PW2 x Rate 2/ TOTAL RATE
= (90 x 185)/315 = 52.85
3. Calculate the Total‑Weighted Pulse Width (TWPW) by adding the rate weighted pulse
widths.
TWPW = RWPW 24.76 + RWPW2 52.85
TWPW = 77.61 µs
4. Determine the area with the largest amplitude.
Largest amplitude = 3.0 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 315 Hz, 77.61 µs, and 3.0 mA are found in the box
associated with 510 Hz, 100 µs, and 3.0 mA. The result is a battery‑longevity projection
of more than 25 years.
Appendix
Vercise™ DBS Physician Manual
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