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15. SPECIAL MODES
15.4. DETECTION CHARACTERISTICS IN THE PRESENCE OF
ELECTROMAGNETIC FIELDS
Per Clause 27.4 of Standard EN 45502-2-2, detection in the presence of electromagnetic
fields is characterized as follows:
─ Differential mode:
─ Common mode rejection ratio:
16.6 Hz 50 Hz 60 Hz
Atrial channel ≥ 75 dB 64 dB 62 dB
Ventricular channel ≥ 69 dB ≥ 57 dB ≥ 56 dB
Modulated interference:
For atrial sensitivity setting of 0.2 mV, compliance to the Cenelec standard 45502-2-2 is met
for a maximum test signal amplitude of 8 V for the frequency of 60 MHz. 0.4 mV complies
with the standard for the whole frequency range.
15.5. PROTECTION AGAINST SHORT-CIRCUITS
The defibrillator can undergo a short-circuit if the anode and cathode are not adequately
separated.
In this case, the shock is aborted to prevent damaging the defibrillator and a warning will
indicate that a short circuit (shock impedance < 20 ohms) was detected during the last
shock.
38 SORIN – INTENSIA SonR CRT-D 184 – U150A