What is the spacing on a quadripolar catheter?

What is the spacing on a quadripolar catheter?

• A. 1-2-3
• B. 2-5-2
• C. 3-4-3
• D. 4-6-4

Answer: (B)

Quadripolar catheters are designed with four electrodes in a straight line along a short segment of the catheter. The standard spacing is 2-5-2 millimeters. This means the gap from the most distal electrode to the next is 2 mm, the gap between the middle two electrodes is 5 mm, and the gap from the third to the most proximal electrode is 2 mm. This arrangement provides a compact distal region for precise local activation timing and pacing, while the wider middle interval helps sample electrical activity over a small length of tissue without excessive signal overlap. In practice, this spacing supports accurate mapping by allowing reliable comparisons between adjacent electrode pairs.

Quadripolar catheters are designed with four electrodes in a straight line along a short segment of the catheter. The standard spacing is 2-5-2 millimeters. This means the gap from the most distal electrode to the next is 2 mm, the gap between the middle two electrodes is 5 mm, and the gap from the third to the most proximal electrode is 2 mm. This arrangement provides a compact distal region for precise local activation timing and pacing, while the wider middle interval helps sample electrical activity over a small length of tissue without excessive signal overlap. In practice, this spacing supports accurate mapping by allowing reliable comparisons between adjacent electrode pairs.