CARDIAC STIMULATOR
ENGLISH Page 31 of 49
12.7 Using the Stimulator Software Protocols
Threshold Protocol. Press 'T' to
select the THRESHOLD protocol.
Next, start pacing by pressing the
[Spacebar]; output current will be
automatically decremented. You will
need to stop pacing when loss of
capture occurs.
ECG Display Bar. During pacing, the
ECG Display Bar in the screen centre
will draw vertical Stimulus Symbols for
each stimulus in each output channel
(short vertical lines for S1, taller for
S2-S7, ‘L’ shaped if high impedance)..
Nodal_ERP and Multi_SX Protocols.
The NODAL_ERP protocol features 3
extra-stimuli for refractory
measurements, with adaptive auto-
decrementation by 50’s and then by
20’s or 10’s. The MULTI_SX protocol
provides up to 6 extra-stimuli for
programmed ventricular stimulation
also with individually controled
decrementation.
Wenckebach, Burst Pace Protocols.
The WENCKEBACH protocol
continuously decrements S1 (paused
by continuous press of the
[Spacebar]). BURST_PACE protocol allows more rapid pacing with S1 values as low as 30 ms (lower
limit for S1 in Burst set in the Config Menu, hotkey 'K', Config Var-2). Stimulation patterns for these
basic protocols are shown in Figure 13 above.
RSynced_Sx, SNRT and AV Delayed Protocols. The Rsynced_Sx protocol produces a train of up to
3 extra-stimuli coupled to a train of sensed P/QRS complexes. The SNRT protocol displays an
elapsed-seconds allarm timer and automatically decrements S1 after stopping pacing. The S1
adjustments may be programmed by the AUTO_DECREMENT variable, which may use a Table of
values, accessed by pressing [Ins] with variable focused. The AV_DELAYED protocol provides
sequential A-V pacing where S1 is the basic pacing interval and the S2 variable sets the AV-delay.
Overdrive Pace and ATP Protocols. Tachyarrhythmia may be rapidly terminated by the temporary
OVERDRIVE BURST_PACE protocol, accessed with the hotkey 'O'.
ECG sensing. Stimulator may sense ECG from either of two external high level ECG Inputs (1 volt
pp), or may sense intracardiac ECG (IECG) from the pacing electrodes of either channel.
Saving Stimulator Defaults. Stimulus and protocol-related parameters for the currently displayed
protocol may be made defaults for that protocol by storing them in the Protocol Setup Memory simply
by pressing the hotkey 'Alt-S' and [Enter]. Note that default CURRENT variable is an exception, and
can be stored only in the THRESHOLD protocol.
Figure 13 Stimulation patterns in basic pacing protocols.
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