Physio-Control LIFEPAK 20e - Manual (Page 161)

Appendix A
Specifications and Performance Characteristics
LIFEPAK 20e Defibrillator/Monitor Operating Instructions A-9
©2006-2013 Physio-Control, Inc.
CHARACTERISTIC
Respiration, Leads Off
Sensing, Noise Cancellation
Current, and Voltage The ECG leads off function uses AC current for sensing leads
off, the disposable defibrillation electrodes use AC current for
leads off, and the ECG leads use a noise cancellation signal
which ranges from DC to approximately 5k Hz. The amplitude
of these signals conforms to AAMI EC-11 3.2.10 and AAMI
EC-13 (1992) 3.2.5.
Heart Rate Averaging
Method The heart rate average is formed by a weighted average of
approximately 8 seconds duration. When the input rate is
trending rapidly, the rate meter will track more quickly. refer
to heart rate response time disclosure. The display update
interval is every heartbeat or every 2 seconds, whichever is
shorter.
Heart Rate With Irregular
Rhythm All complexes are detected. The rate meter output can range
from the heart rate associated with the shortest R-R interval
to the heart rate associated with the longest R-R interval.
When present, intermediate length R-R intervals are favored
as the basis for the rate.
Heart Rate Alarm Time In five trials for a 1 mV, 206 bpm tachycardia, the average
detection time was 7.1 seconds. The maximum detection
time was 7.9 seconds. The minimum time was 5.6 seconds.
For a test signal half as large, the average was 6.1 seconds,
the maximum was 6.4, and the minimum was 5.7. In this case
the device sensitivity was increased to 5 mV/cm.
For a test signal twice as large, the average was
5.7 seconds, the maximum was 6.3, and the minimum was
5.1.
In five trials for a 2 mV, 195 bpm tachycardia, the average
detection time was 6.2 seconds. The maximum detection
time was 7.1 seconds. The minimum time was 5.8 seconds.
For a test signal half as large, the average was 6.0 seconds,
the maximum was 6.7, and the minimum was 5.4. In this case
the device sensitivity was increased to 5 mV/cm.
For a test signal twice as large, the average was
6.0 seconds, the maximum was 6.4, and the minimum was
5.8.
Accuracy Of Signal
Reproduction The device is a digital sampled data system. It meets
requirements for both test methods for diagnostic frequency
response described in EC11 section 3.2.7.2.