What TCL change would prompt remapping of the activation map?

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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

What TCL change would prompt remapping of the activation map?

Explanation:
Activation maps depend on the threshold current level (TCL) needed to activate a site. If the TCL shifts, the set of sites that meet activation changes, so the map should be updated to reflect the new pattern. The trigger is a change in TCL that is substantial enough to indicate a real shift in excitability—typically defined as more than about 10% from the baseline. Changes smaller than that, such as around 5%, are usually within normal variability and don’t mandate remapping. A large shift, like 30%, certainly qualifies, but the rule is the threshold: any change exceeding 10% prompts remapping.

Activation maps depend on the threshold current level (TCL) needed to activate a site. If the TCL shifts, the set of sites that meet activation changes, so the map should be updated to reflect the new pattern. The trigger is a change in TCL that is substantial enough to indicate a real shift in excitability—typically defined as more than about 10% from the baseline. Changes smaller than that, such as around 5%, are usually within normal variability and don’t mandate remapping. A large shift, like 30%, certainly qualifies, but the rule is the threshold: any change exceeding 10% prompts remapping.

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