Physio Control LIFEPAK 20, Руководство пользователя

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Specifications and Performance Characteristics
A-10 LIFEPAK 20e Defibrillator/Monitor Operating Instructions
CHARACTERISTIC
Respiration, Leads Off
Sensing, Noise Cancellation
Current, and Voltage The ECG leads off function uses AC current at 57.1 kHz for
sensing leads off, the disposable defibrillation electrodes use
AC current at 57.1 kHz 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 IEC 60601-1.
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 Step Response
Time 80 bpm to120 bpm input step change:

10 seconds to
indicate a minimum of 100 bpm.
80 bpm to 40 bpm input step change:

10 seconds to
indicate a maximum of 60 bpm.
Heart Rate With Irregular
Rhythm 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.
When evaluated per IEC 60601-2-27, rates are as follows:
• A1. Ventricular bigeminy: HR = 80 to 86
• A2. Slow alternating ventricular bigeminy: HR = 60 to 63
• A3. Rapid alternating ventricular bigeminy: HR = 123 to 124
• A4. Bidirectional systoles: HR = 97 to 99
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.