SVT Case Study – #3

A 45-year-old female presents to the EP lab with complaints of palpitations and the following 12 lead ECG that was recorded in the emergency room 2 weeks prior. 12 Lead ECG:  What do you observe?   Answer: Retrograde P Waves  Notice the retrograde P waves,...

The What, Where & Why of Double Potentials

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...

Electrogram Interpretation – 22

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. ...

Electrogram Interpretation – 21

This week’s electrogram interpretation:  A 56-year-old female came into the EP lab with complaints of palpitations. During initial catheter placement, the following electrogram was recorded. Only the His and CS catheters are in the heart at this time (CS in...

Electrogram Interpretation – 20

This week’s electrogram interpretation:  A 22-year-old male came into the EP lab with complaints of palpitations. During the EP study, the following rhythm was induced.  The HRA, His, CS, and RV catheters are in their standard positions. #1  – What rhythm...

Electrogram Interpretation – 19

This week’s electrogram interpretation:  The following electrogram was recorded during an RF PVI ablation. The ablation catheter and HD Grid mapping catheter are located in the LSPV at the time of this recording.  The CS and His catheters are in their standard...