Cardiac stimulator 4427 Easypace - Instructions for use
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1. setting the sensitivity threshold by rapid adjusting
steps. The display appears as shown in the figure
on the right. In case of no spontaneous impulse for
about 2 seconds, the 4427 Easypace sets itself to
72 ppm, 20 mA and 1.1 mV threshold, thereby
ending the program.
2. Temporary setting the stimulation rate (based on the impulses detected during the
sensitivity threshold setting) as follows:
• < 50 ppm ⇒ 56 ppm
• 50÷110 ppm ⇒ spontaneous rate increased by 1/8 (e.g.:72 ppm becoming 81
ppm)
• >110 ppm ⇒ stimulation with safety parameters
(VVI, 72 ppm, 20 mA, 1.1 mV of sense)
3. stimulating in VVI mode with 10 mA amplitude;
subsequently adjusting the amplitude with 20 or 30 mA
values depending or not on the capture of the cardiac
activity. During the stages indicated on points 3 and 4, the
display appears as in the figure on the right.
4. Setting of the stimulation rate (as far as the 50÷100 ppm range of spontaneous rates is
concerned) to a value of 1/8 lower than the spontaneous one being detected (e.g.:
spontaneous 72 ppm becoming 63 ppm).
The setting of the rate is performed in such a sequence (first rate
spont
+ 1/8, then
rate
spont
- 1/8) as to ensure the capture while assessing the stimulation threshold and,
afterwards, to set a surveillance value.
Upon completion of the automatic settings, the operating mode is a synchronous VVI (as
shown on the display) which, accordingly, allows either to stop the stimulation by pressing
(for 1÷2 seconds) STAND-BY, or to shift to the asynchronous stimulation by pressing V00
or to adjust all the parameters without interrupting the stimulation itself.
At any moment, during the program, it is possible to interrupt the automatic settings and
start the manual stimulation by pressing the relevant keys VVI, V00 or EMERGENCY.
Also in this case the display will be turned off after 20 seconds from the last pressure of a
key.
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