Electrocardiogram change type code N

Guide for use:

ST-segment changes

CODE 10 ST-segment-elevation >= 1 mm (0.1 mV) in >= 2 contiguous limb leads

ST-segment-elevation indicates greater than or equal to 1 mm (0.1 mV) elevation in 2 or more contiguous limb leads.

CODE 11 ST-segment-elevation >= 2 mm (0.2 mV) in >= 2 contiguous chest leads

ST-segment-elevation indicates greater than or equal to 2 mm (0.2 mV) elevation in 2 or more contiguous chest leads.

CODE 12 ST-segment depression >= 0.5 mm (0.05 mV) in >= 2 contiguous leads (includes reciprocal changes)

ST-segment depression of at least 0.5 mm (0.05 mV) in 2 or more contiguous leads (includes reciprocal changes).

T-wave changes

CODE 20 T-wave inversion >= 2 mm (0.2 mV)

T-wave inversion of at least 2 mm (0.2 mV) including inverted T waves that are not indicative of acute MI.

Q wave changes

CODE 30 Significant Q waves

Q waves refer to the presence of Q waves that are greater than or equal to 0.03 seconds in width and greater than or equal to 1 mm (0.1 mV) in depth in at least 2 contiguous leads.

Bundle-branch block changes

CODE 40 Left bundle branch block (BBB)

Diffuse left bundle-branch block pattern.

CODE 41 Right bundle-branch block (BBB)

Diffuse right bundle-branch block pattern.

CODE 42 Indeterminate bundle-branch block (BBB)

Bundle-branch block pattern identified, but left or right location is unclear.

CODE 90 Non-specific

Changes not meeting the above criteria.

CODE 99 Not stated/inadequately described

Includes unknown.