Mallinckrodt NPB-190 Manuel de l'opérateur télécharger pdf (Page 35)

Start-Up and Use

• 50 seconds after loss of pulse is detected in the presence

of continuous motion

When operating on DC power, during a low battery

condition, the Low Battery Indicator illuminates and the

alarm tone sounds immediately, even if the alarms are

silenced or set to OFF.

Management of Loss-of-Pulse Alarm

The NPB-295 signal processing is designed to reduce the adverse

effects of normal interference associated with motion, low patient

perfusion, and spurious electrical or optical signals. Figure 7

illustrates monitor response in sporadic or lost pulse situations

with and without continuous motion.

Losing the pulse presents an alarm-management challenge for any

oximeter—sometimes it is caused by a clinical emergency,

sometimes by signal distortion. When the pulse is lost because of

deteriorating patient condition, the oximeter should alarm

quickly. However, normal interference can obscure the pulsatile

signal. If interference is short-lived, no alarm will sound. Such

alarms are distracting and potentially time-consuming. However,

if interference persists, an alarm should notify the attendant.

The NPB-295 loss-of-pulse alarm is designed for use in

environments in which the pulse can be obscured by interference.

Most loss-of-pulse alarms are attributable to interference from

patient motion, which typically is brief.

When the pulsatile signal is lost, the NPB-295’s ability to identify

interference from motion becomes particularly important because

the response of the monitor is determined by the presence or

absence of interference from patient motion. Because a

spontaneously moving patient can be assumed to have a pulse, as

long as continuous motion is detected, the NPB-295 continues to

search for the pulse.

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Mallinckrodt NPB-190 Manuel de l'opérateur Page 35