During mapping, what do QS unipolar signals indicate?

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Prepare for the Electrophysiology Unit (EPU) 26.19 exam with our interactive quiz featuring flashcards and multiple choice questions. Check your understanding with hints and explanations for each question.

Multiple Choice

During mapping, what do QS unipolar signals indicate?

Explanation:
QS unipolar signals show that the activation wavefront is moving away from the recording electrode, which results in a pure negative deflection with no initial positive deflection. This pattern identifies that the local tissue is activated later in the sequence compared with its surroundings, i.e., late activation. If the wavefront were moving toward the electrode, you would see a positive deflection (an R wave) instead of a QS. QS tells you about timing and direction, not simply about distance from other regions.

QS unipolar signals show that the activation wavefront is moving away from the recording electrode, which results in a pure negative deflection with no initial positive deflection. This pattern identifies that the local tissue is activated later in the sequence compared with its surroundings, i.e., late activation. If the wavefront were moving toward the electrode, you would see a positive deflection (an R wave) instead of a QS. QS tells you about timing and direction, not simply about distance from other regions.

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