Sync Mode; Svt (Supraventricular Tachycardia) Discriminators; Svt Rate; Continuous Monitoring For Shockable Rhythm - GE Responder 2000 Service Manual

SECTION 8: Specifications and Safety

Sync Mode

The Responder 2000 is designed to deliver synchronized shock on the R-wave for Sync Shock. The Responder 2000 will
automatically attempt to synchronize a shock to the R-wave. If delivery cannot be synchronized within two seconds it will
not deliver the shock. It is recommended to select/adjust to a lead with a unipolar R wave of about 1 mV peak amplitude
for safe and reliable synchronization.
IEC 60601-2-4 (2002) and ANSI/AAMI DF 80 (2003), clause 104c states that the maximum delay from the "peak of the
QRS" to the peak of the defibrillator output waveform shall be 60ms. Verification testing has shown that the Responder
2000 meets this requirement of the standards.
Some ECG leads may exhibit a bipolar QRS waveform complex, and in these cases, the RHYTHMx software in the
Responder 2000 will pick the highest peak of the QRS complex for synchronization. The peak of the defibrillator output
will occur in less than 60ms from this peak, and therefore the Responder 2000 meets the synchronization requirement of
the standards.
In the case of these leads, certain defibrillator testers may use a different part of the QRS complex (for example the first,
smaller peak) to measure synchronization time of defibrillation. This may give a measurement result that exceeds 60ms.
Investigation has shown that the Responder 2000 does synchronize appropriately from the peak of the QRS complex, and
meets the requirement of the standards in cases where a particular defibrillator tester does not measure the defibrillation
delay from the peak of the QRS complex.

SVT (Supraventricular Tachycardia) Discriminators

The Responder 2000 is supplied with the SVT Discriminator enabled and the default setting is 240 bpm. SVT
Discriminators are sophisticated filters that analyze the morphology of the ECG waveforms and distinguish VF/VT from
SVT and Normal Sinus Rhythms (NSR). The SVT Discriminator will only be applied to rhythms that fall between the
Detection Rate and the SVT Rate.

SVT Rate

All rhythms with rates between the Detection Rate and SVT Rate will be screened through a number of SVT
Discriminators to classify them into VF/VT or SVT. Rhythms classified as SVT between the two set rates are not
shockable. All rhythms above the rates will be classified as shockable. The SVT Rate must be greater than the Detection
Rate and is selectable between 125 and 240 bpm. The default SVT rate is 240.

Continuous Monitoring For Shockable Rhythm

The Responder 2000 can monitor the ECG rhythms continuously.

Pacemaker Pulse Information

Pacemaker pulses without overshoot, in all of the conditions specified in ANSI/AAMI EC13 section 4.1.4.1, in the range of
20mV to 700mV and 0.1 milliseconds to 2 milliseconds wide, will be rejected by the Responder 2000.
Pacemaker pulses with overshoot, in all the conditions specified in ANSI/AAMI EC 13 section 4.1.4.2, in the range of
20mV to 700MmV and 0.1 milliseconds to 2 milliseconds wide, will be rejected by the Responder 2000.
The pacer pulse detector will not respond to the waveform of ANSI/AAMI figure 5d, since this waveform is below the
threshold of the Responder 2000 pacer pulse detector. The minimum typical slew rate in V/s RTI that will trip the pacer
detector is 6.2 V/s for the 3 and 5 lead ECG. The minimum typical slew rate in V/s RTI that will trip the pacer detector is
9.8 V/s for paddles.
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2025653-048 Revision B Responder 2000 Page 104