The activation pattern in the coronary sinus electrodes during normal sinus rhythm is called what?

The activation pattern in the coronary sinus electrodes during normal sinus rhythm is called what?

• A. Concentric Activation
• B. Radial Activation
• C. Central Activation
• D. Linear Activation

Answer: (A)

During normal sinus rhythm, activation of the left atrial region around the coronary sinus spreads in a circular, outward fashion from a central entry point at the CS ostium. This creates a pattern where activation appears to radiate around the circumference of the coronary sinus, with the earliest activation near the proximal CS and progressively later activation as you move distally along the catheter. That circular spread is described as concentric activation. Radial activation would imply a single focal site sending waves outward in spokes, which isn’t how the CS shows activation in sinus rhythm. Linear activation would imply a sequential, one-directional wavefront along a line, not a circular spreading pattern.

During normal sinus rhythm, activation of the left atrial region around the coronary sinus spreads in a circular, outward fashion from a central entry point at the CS ostium. This creates a pattern where activation appears to radiate around the circumference of the coronary sinus, with the earliest activation near the proximal CS and progressively later activation as you move distally along the catheter. That circular spread is described as concentric activation.

Radial activation would imply a single focal site sending waves outward in spokes, which isn’t how the CS shows activation in sinus rhythm. Linear activation would imply a sequential, one-directional wavefront along a line, not a circular spreading pattern.