- High frequency, clicking, pre-systolic sound
- Produced by transvenous pacemakers
- Due to stimulation of intercostal muscles by the endocardial leads
- Timing correlates with pacemaker spike in ECG
- Associated with twitching of chest wall muscle - contraction of chest wall muscle following spread of electrical impulse from pacemaker
- Diaphragmatic stimulation can also occur
- Very loud sound may suggest myocardial perforation
Thursday, February 25, 2010
What are Pacemaker sounds?
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