EGM Interpretation – 26

What is happening in this electrogram? Where to begin….? Where are each of the catheters located? Are we pacing? What type of pacing and from where? Did we capture? Did it conduct? What was the activation pattern? Answer: The catheter positions match the color of the...

EGM Interpretation – 25

What is happening in this electrogram? What is observed in the following electrogram? Catheters: HRA, His, CS, RV. All catheters are in the usual positions.   Interpretation Steps: Determine Pacing Site Did we capture? Did it conduct to the next chamber? What was...

Atypical AFL Map Interpretation

Anatomy Identification   What structures are you able to identify in the following images?  What views are displayed?        Answer:   Lets work on interpretation.   The CS electrogram is displayed below. What is observed?    ...

Ventricular Overdrive Pacing

What are we doing??   Tachycardia is displayed on the right half of the electrogram, and the differential pacing attempt is on the left.    Where do we even begin? Where are we pacing? What type of pacing? Did we capture? What maneuver is being performed?...

Entrainment? Let’s break it down!

What is the rhythm?     Answer: This is atrial flutter. Notice the regular atrial rate and that there are more atrial events than ventricular. We can also see that the CS is depolarizing from proximal to distal. Is this typical AFL? How do you know? How can...

Electrogram Interpretation – 24

How do we determine success? A patient undergoing PVI (pulmonary vein isolation) for paroxysmal atrial fibrillation is in the lab. After completion of the WACA (wide area circumferential ablation), there was remaining signal in the left superior pulmonary vein. The...