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SIGMA Manual Number 41018
Revision AR
APPENDIX C - BOLUS ACCURACY
The SIGMA Spectrum IV Pump may have an optional bolus mode of operation. This feature allows
the user to perform a BOLUS SETUP action. To utilize this feature the pump must be programmed
with either a specific rate or a specific amount to be delivered in a certain amount of time.
If the pump is currently operating in mL/hr delivery mode, the bolus rate value is entered in mL/hr
and the volume is entered in milliliter (mL). If the pump is operating in a non-mL/hr delivery mode
(for example mcg/kg/min), the bolus amount would be entered in mcg/kg however the mL/HR soft-
key may be pressed in the setup screen to enter the bolus information in mL/hr format.
In either mode, the time is entered in minutes and seconds (min:sec). Limits are placed on the mini-
mum and maximum amount of time for the bolus delivery. The limit constraints are contained
within the software of the Spectrum pump and are necessary to control the maximum or minimum
flow rate of the bolus infusion.
The accuracy of the bolus volume is dependent on the resultant flow rate that is obtained from the
calculation of volume to be delivered in the time requested. For example if the maximum bolus vol-
ume is 300 mL, the maximum flow rate is obtained with a bolus time of 18:01 (min:sec) or a flow
rate of approximately 999 mL/hr. Using this maximum bolus volume, and delivering the volume in
the shortest amount of time, the mean value of 300 mL ± 5% may be expected. Whereas using a
minimum bolus volume (.5 mL), and delivering the volume in a short amount of time (1 minute), the
mean value of .5 mL ±16% may be expected.