26 Specifications and Standards Compliance
196
MECG Alarm Specifications Range Adjustment
MECG Alarm Limits High Range: 31 to 240
Default: 120 bpm
1 bpm steps (30 to 40 bpm)
5 bpm steps (40 to 240 bpm)
Low Range: 30 to 235
Default: 50 bpm
Tachycardia Difference to high limit: 0 to 50 bpm
Default: 20 bpm
5 bpm steps
Clamping at: 150 to 240 bpm
Default: 200 bpm
5 bpm steps
Bradycardia Difference to low limit: 0 to 50 bpm
Default: 20 bpm
5 bpm steps
Clamping at: 30 to 100 bpm
Default: 40 bpm
5 bpm steps
ECG/Arrhythmia/ST Supplemental Information as required by IEC 60601 - 2- 27
Maximum T-wave amplitude a = 8.0 mm
Heart Rate Averaging Method Three different methods are used:
Normally, heart rate is computed by averaging the 12 most
recent RR intervals.
For runs of PVCs, up to 8 RR intervals are averaged to
compute the HR.
If each of 3 consecutive RR intervals is greater than 1200 ms
(that is, rate less than 50 bpm), then the 4 most recent RR
intervals are averaged to compute the HR.
Display Update Rate 2 s
Response Time of Heart Rate Meter to
Change in Heart Rate
HR change from 80 to 120 bpm: Average: 9 seconds
HR change from 80 to 40 bpm: Average: 10.5 seconds
Heart Rate Meter Accuracy and
Response to Irregular Rhythm
Ventricular bigeminy: 63 bpm
Slow alternating ventricular bigeminy: 46 bpm
Rapid alternating ventricular bigeminy: 93 bpm
Bidirectional systoles: 125 bpm
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