Liverpool Hospital
Intensive Care: Learning Packages
Intensive Care Unit
Pacemaker Learning Package
LH_ICU2016_Learning_Package_Pacemaker_Learning_Package
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In this example we see the pacemaker inhibited by the patient’s intrinsic
atrial rate and intrinsic AV conduction.
The patient’s A-A interval is shorter than the Lower
Rate interval, as his
P-R interval is shorter than the programmed AV interval.
Are all four outcomes of DDD possible for all patients?
No, patients with complete heart block cannot have AS-VS or AP-VS
Core Pace Module 6. Single and Dual Pacemaker timing ppt
presentation 2003
When atrial beats are unsynchronized or absent, as in atrial fibrillation,
atrioventricular block, or sinus arrest, cardiac output decreases because
less blood than usual is ejected from the atria during ventricular diastole.
This concept is important because almost 30% of normal cardiac output is
due to the atrial “kick,” or atrial systole, that occurs during
ventricular filling
when the 2 chambers perform in sync.
For
maximum effectiveness, paced beats and intrinsic beats must be
synchronized.
To synchronize the beats, the pacemaker first analyses the intrinsic rhythm
and then stimulates the heart only as needed.
Demand Pacing
Output is inhibited when the pacemaker senses intrinsic activity
Pacemaker rate can be set to allow intrinsic rhythm to occur. If the pt’s
heart rate drops below the set pacemaker rate the pacemaker will
pace the pt @ that rate
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