Related Experiment Videos
Adaptive rate pacing controlled by the right ventricular preejection interval: clinical experience with a
J H Ruiter1, J P Heemels, D Kee
1Department of Cardiology, Medical Centre Alkmaar, The Netherlands.
Pacing and Clinical Electrophysiology : PACE
|June 1, 1992
Summary
The pre-ejection interval (PEI) effectively monitors metabolic demand in patients with Precept pacing systems. This study shows PEI
Area of Science:
- Cardiology
- Biomedical Engineering
- Physiology
Background:
- The Precept pacing system utilizes right ventricular intracardiac impedance to assess metabolic demand.
- The pre-ejection interval (PEI) is a key indicator of contractility changes, reflecting physical and emotional stress.
Purpose of the Study:
- To evaluate the stability and dynamic behavior of the pre-ejection interval (PEI) in patients with a Precept pacing system.
- To assess the potential of PEI for adaptive rate pacing during exercise and postural changes.
Main Methods:
- Ten patients with a Precept pacing system were monitored during various exercise protocols and postural changes.
- The study analyzed the chronic stability and dynamic responses of the pre-ejection interval (PEI).
Main Results:
- Excellent chronic stability of PEI was observed over 147 months of total device experience.
- PEI significantly shortened during bicycle ergometry (P < 0.05), indicating increased metabolic demand.
- Low-level exercise promptly decreased PEI and increased pacing rate in all patients.
Conclusions:
- The pre-ejection interval (PEI) demonstrates excellent stability and dynamic responsiveness in a pacing system.
- PEI shows promise as a reliable indicator for adaptive rate pacing, reflecting metabolic demand.