Which of the following is NOT a mechanism of tachycardia activation?

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Multiple Choice

Which of the following is NOT a mechanism of tachycardia activation?

Explanation:
Tachycardia activation comes from three main processes: automaticity, where non-sinus pacemaker tissue begins firing spontaneously; triggered activity, where afterdepolarizations produce premature beats that can ignite a tachycardia; and reentry, where a wavefront continually circles a circuit to sustain rapid activation. Conduction block by itself does not initiate tachycardia; it is a conduction abnormality that can shape the substrate for reentry, such as creating a unidirectional block, but it does not actively generate the tachycardic impulse. So conduction block is not a mechanism of tachycardia activation.

Tachycardia activation comes from three main processes: automaticity, where non-sinus pacemaker tissue begins firing spontaneously; triggered activity, where afterdepolarizations produce premature beats that can ignite a tachycardia; and reentry, where a wavefront continually circles a circuit to sustain rapid activation. Conduction block by itself does not initiate tachycardia; it is a conduction abnormality that can shape the substrate for reentry, such as creating a unidirectional block, but it does not actively generate the tachycardic impulse. So conduction block is not a mechanism of tachycardia activation.

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