What is the standard criterion for defining STEMI in a limb lead?

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Multiple Choice

What is the standard criterion for defining STEMI in a limb lead?

STEMI on an ECG is defined by new ST-segment elevation in two contiguous leads that reflect the same region of the heart. For limb leads, the standard threshold is at least 1 mm of ST elevation at the J point in two neighboring limb leads. This contiguity matters because two adjacent views of the same myocardial region reinforce that the change is truly ischemic and not just a reading in one lead. In contrast, the chest (precordial) leads require a higher threshold, typically 2 mm in two contiguous leads. So the criterion that fits limb leads best is ST elevation of at least 1 mm in two contiguous limb leads.

STEMI on an ECG is defined by new ST-segment elevation in two contiguous leads that reflect the same region of the heart. For limb leads, the standard threshold is at least 1 mm of ST elevation at the J point in two neighboring limb leads. This contiguity matters because two adjacent views of the same myocardial region reinforce that the change is truly ischemic and not just a reading in one lead. In contrast, the chest (precordial) leads require a higher threshold, typically 2 mm in two contiguous leads. So the criterion that fits limb leads best is ST elevation of at least 1 mm in two contiguous limb leads.

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