217288
Pacemaker
- an electronic device that
provides electrical stimuli to
the heart
- Components
- generator
- circuit and batteries that
determine the rate,
strength, and sensitivity
- sensitivity: detects the
intracadiac electrical activity
to cause an appropriate
response measured in
milivolts
- If it can't see activity
it will either fire when
it shouldn't or not fire
when it should
- To what extent can the
pacemaker realize what the
patient's heart needs?
Does the pacemaker know
what's going on in a
patient's heart rhythmn?
- If it can't see activity
it will either fire when
it shouldn't or not fire
when it should
- threshold: How
much electrical
charge that we need
to produce a
mechanical
contraction?
- sensitivity: detects the
intracadiac electrical activity
to cause an appropriate
response measured in
milivolts
- circuit and batteries that
determine the rate,
strength, and sensitivity
- electrodes
- carry the impulse
created by the
generator to the
heart
- carry the impulse
created by the
generator to the
heart
- generator
- Indication: slow pulse
formation, AV or
ventricular conduction
disturbance,
complete/third degree
heart block
- Types
- temporary
- outside the body
- If the pt is suddenly
bradycardic,
symptomatic, has a
pulse, unresponsive
to atropine pacing
start transcuatneous
pacing
- transcutaneous
pacemaker:
comes directly
through the kin.
one pad on the
chest one pad on
the back. pt is
sedated
- If the pt is suddenly
bradycardic,
symptomatic, has a
pulse, unresponsive
to atropine pacing
start transcuatneous
pacing
- outside the body
- permanent
- inside the body
- inside the body
- temporary
- Codes
- First Letter: Pace
A/V/D; atrial,
ventricular, dual
- Second Letter: Senses A/V/D
- Third Letter:
Responds T/I trigger,
inhibit
- Third Letter:
Responds T/I trigger,
inhibit
- Second Letter: Senses A/V/D
- First Letter: Pace
A/V/D; atrial,
ventricular, dual
- When a
pacemaker
undersenses, it
OVER paces!
failure to sense,
fires
inappropriately
- capture: denote that the
appropriate complex
followed the pacing spike
- no capture:
pacemaker
firing, no
ventricular
contraction
- capture: denote that the
appropriate complex
followed the pacing spike
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