Welch Allyn Medical Diagnostic Equipment Medical Alarms 8.1x Manual Do Utilizador

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Chapter 11   Specifications
Welch Allyn  Acuity Central Monitoring System
Acuity System pacemaker detection
Table 24.  Pacemaker detection with the Acuity System Arrhythmia Analysis module
Monitor
Characteristic
Specification
Micropaq
Acuity System 
Virtual Monitor
Pacer indicator shown on screen if PACER display turned ON; pacer spike 
always shown if of sufficient amplitude. 
Pacer Pulse 
Detection/
Rejection
Pacer detection range (i.e., shows the dashed vertical marker) for ±3 mV to 
±700 mV @ 0.1 ms width, ±2 mV to ±700 mV @ 0.2 to 2 ms pulse width in 
electrically quiet environment. Thresholds adjust to reject repetitive 
ambient noise. Pacer detector influences QRS picking even while pacer 
indication is disabled.
Does not count as heartbeats approximately 95% of pacemaker pulses 
within pacer detection range
a
, with or without AAMI (EC13-1992) tails of 4, 
25, 50, 75 or 100 ms decay time constant, whose tail amplitudes are up to 
25%, 2 mV maximum, whether ventricular only, or A-V sequential pulses 
(150 and 250 ms separation), all per AAMI 1992 tests 3.1.4.1 and 3.1.4.2.
Propaq CS
Propaq Encore
Acuity System 
Virtual Monitor
Pacer indicator shown on screen if PACER display turned ON; pacer spike 
always shown if of sufficient amplitude.
Pacer Pulse 
Detection/
Rejection
Pacer detection range (i.e., shows the dashed vertical marker) for 0.1 ms 
pulses is ±3 mV to ±700 mV, and drops linearly to ±2 mV to ±700 mV for 0.2 
to 2 ms pulses. Pacer detector influences QRS picking even while pacer 
indication is disabled.
Does not count as heartbeats approximately 95% of pacemaker pulses that 
are within pacer detection range
a
 with or without AAMI (EC13 1992) tails of 
4, 25, or 50, 75 or 100 ms decay time constant, whose tail amplitudes are 
2.5% or 25%, 2 mV maximum, whether ventricular only, or A-V sequential 
pulses, all per AAMI 1992 tests 3.1.4.1 and 3.1.4.2
Propaq LT
Acuity System 
Virtual Monitor
Pacer indicator shown on screen if PACER display turned ON; pacer spike 
always shown if of sufficient amplitude.
Pacer Pulse 
Detection/
Rejection
Pacer detection range= ±3.2 mV to ±700 mV @ 0.1 ms width, ±2 mV to ±700 
mV @ 0.2 to 2 ms pulse width, all with or without overshoot, in electrically 
quiet environment. Thresholds adjust to reject repetitive ambient noise. 
Pacer detector influences QRS picking even while pacer display indication is 
disabled.
Does not count as heartbeats approximately 95% of pacemaker pulses 
within pacer pulse detection range
a
, with or without AAMI (EC13 2002) tails 
of 4, 8, 15, 25, 50, 75, or 100 ms decay time constant, whose tail amplitudes 
meet either EC13’s method A or method B specifications, whether 
ventricular only, or A-V sequential pulses (150 and 250 ms separation), all 
per AAMI tests 4.1.4.1 and 4.1.4.2
a.
Rejects method B overshoots for [pulse width] x [pulse amplitude] < 3 x 10
-4
 V-sec.