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Left atrial electrograms recorded through the patent foramen ovale
Catheterization and Cardiovascular Diagnosis
|January 1, 1980
Summary
Recording left atrial electrograms via a patent foramen ovale is feasible. This technique aids electrophysiological studies by providing direct left atrial signals, especially when standard methods are insufficient.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Devices
Background:
- A patent foramen ovale (PFO) is an atrial septal defect.
- Direct recording of left atrial (LA) electrograms is challenging.
- Electrophysiological studies (EPS) assess cardiac electrical activity.
Purpose of the Study:
- To evaluate the utility of recording direct LA electrograms through a PFO during EPS.
- To compare LA depolarization timing with other intracardiac signals.
Main Methods:
- Simultaneous recording of high right atrial (HRA), coronary sinus (CS), and direct LA electrograms in three patients with PFO.
- Analysis of depolarization timing relative to surface ECG P waves and other intracardiac leads.
Main Results:
- Direct LA electrograms were successfully obtained in all three patients via PFO.
- In two patients with normal P waves, LA depolarization preceded CS and low RA depolarization.
- In one patient with a prolonged P wave, LA depolarization occurred late, after low RA depolarization.
Conclusions:
- Recording LA electrograms through a PFO is a valuable technique in EPS.
- PFOs should be actively sought during EPS to facilitate direct LA recordings.
- This method provides insights into atrial conduction patterns.