Related Experiment Videos
Characteristics of intracardiac electrograms
Pacing and Clinical Electrophysiology : PACE
|January 1, 1978
Summary
Smaller electrode areas on pacemaker leads decrease R wave amplitude and complex width, while increasing electrogram slopes and bandwidth. These changes are influenced by sensing amplifier loading, causing more distortion with smaller electrodes and lower lead resistances.
Area of Science:
- Cardiology
- Biomedical Engineering
- Electrophysiology
Background:
- Pacemaker implantation requires precise measurement of cardiac electrical activity.
- Endocardial leads are crucial for sensing and pacing functions.
- Electrode size can influence signal characteristics.
Purpose of the Study:
- To investigate the impact of endocardial lead electrode area on cardiac electrogram properties.
- To analyze how electrode size affects signal amplitude, width, and slope.
- To understand the role of sensing amplifier loading in signal distortion.
Main Methods:
- Cardiac electrograms were recorded from endocardial leads during pacemaker implantation.
- Measurements were taken using electrodes of varying small areas.
- The influence of sensing amplifier loading on signal characteristics was assessed.
Main Results:
- Decreased electrode area led to reduced R wave amplitude and complex width.
- Smaller electrodes resulted in increased electrogram slopes and bandwidth.
- Signal distortion was most significant with small electrodes and low lead resistances.
Conclusions:
- Electrode area is a critical factor influencing cardiac electrogram morphology and quality.
- Optimizing electrode size is essential for accurate sensing in pacemaker patients.
- Sensing amplifier characteristics must be considered to mitigate distortion with small electrodes.