User's Manual Part 10

Directions for Use Specifications 165
HR averaging method HR = 60/(latest average interval in seconds)
For higher HR, latest avg interval = 7/8 (previous avg interval) + 1/8 (latest interval).
For lower HR, latest avg interval = 3/4 (previous avg interval) + 1/4 (latest interval).
Transition rates for choice of formula include hysteresis and are 70 and 80 beats/min.
Drift tolerance (AAMI spec.
EC13-2002, 4.2.6.3)
80 beats/min indicated for 80 beats/min ECG plus drift waveform
Pacer pulse display indication Pacer indicator (dashed vertical marker) shown on screen if pacer indicator is ON; pacer
signal always shown if of sufficient amplitude.
Pacer pulse detection (i.e., for
which the monitor displays a
dashed vertical marker in
trace)
Pulses = ± 3.2 mV to ± 700 mV @ 0.1 ms and ± 2 mV to ± 700 mV @ 0.2 to 2 ms, all with
or without overshoot, in electrically quiet environment. Thresholds automatically adjust
to reject repetitive ambient noise. Pacer detector influences QRS picking even while
pacer display indication is disabled.
Pacer pulse rejection Does not count as heartbeats approximately 95% of pacemaker pulses within pacer
pulse detection range, with or without AAMI (EC 13-2002) tails of 4, 8, 15, 25, 50, 75, or
100 ms decay time constant, whose tail amplitudes meet either EC 13’s method A or
method B criteria for single pacer pulses, or A
-V sequential pulses (150 ms and 250 ms
separation), all per AAMI tests 4.1.4.1 and 4.1.4.2.
Pacer pulse detector minimum
slew rate detection threshold
2.5 V/sec RTI, per EC13:2002, 4.1.4.3
ECG trace duration 3 seconds in single or double trace display
6 seconds in cascade
Response to Irregular Rhythm (AAMI specification EC13-2002, 4.1.2.1. Part e.)
Ventricular bigeminy (VB) 78 to 81 beats/min (80 beats/min expected)
Slow alternating VB 57 to 65 beats/min (60 beats/min expected)
Rapid alternating VB 118 to 123 beats/min (120 beats/min expected)
Bidirectional systole 88 to 93 beats/min (90 beats/min expected)
1 mV ventricular tachycardia 197 to 198 beats/min (206 beats/min expected)
2 mV ventricular tachycardia 193 to 197 beats/min (195 beats/min expected)
Table 13. Specification: ECG (continued)