What are double potentials? Answer: The term double potential literally means two potentials or signals. Most referred to in the atrium, double potentials are atrial electrograms with two discrete deflections per beat separated by an isoelectric or low...
Question: Today, let’s go back to the basics and discuss catheter placement and waveforms. In the following electrogram, none of the intracardiac channels are labeled. Identify each catheter location, the associated waveforms, and the rhythm. Answer: This is an...
This week’s electrogram: This patient was brought into the EP lab for ablation of typical atrial flutter. She has had no previous ablations and was in normal sinus rhythm when placed on the monitor. The following electrogram was recorded at soon as the...
Where are the following catheter located? What signals are displayed on each channel? What is the rhythm? Answer: The first three channels displayed are surface ECG leads. A full 12-lead ECG was placed on the patient, but only a few were displayed. Also of note,...
What is the catheter location in the following electrogram? Answer Near the Bundle of His The catheter is labeled coronary sinus (CS); however, the signals do not reflect that location. Notice the A, H, and V signals recorded. Instead of placement in the coronary...
This week’s electrogram interpretation: This patient is in the lab for an SVT study. A four-catheter EP study was performed with the catheters in the standard locations. The following series of electrograms were recorded during baseline extra-stimulus testing. ...
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