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MINNESOTA CODE 4

ST Junction (J) and Segment Depression

(Do not code in the presence of codes 6-4-1, 7-l-l, 7-2-1 or 7-4.

When 4-1, 4-2, or 4-3 is coded, then a 5-code must also be assigned except in lead V1.)

Anterolateral Site (Leads I, aVL, V6)

4-1-1

STJ depression >= 2.0 mm and ST segment horizontal or downward sloping in any of leads I, aVL, or V6.

4-1-2

STJ depression >= 1.0 mm but < 2.0 mm, and ST segment horizontal or downward sloping in any of leads I, aVL, or V6.

4-2

STJ depression >= 0.5 mm and < 1.0 mm and ST segment horizontal or downward sloping in any of leads I, aVL, or V6.

4-3

No STJ depression as much as 0.5 mm but ST segment downward sloping and segment or T-wave nadir >= 0.5 mm below P-R baseline, in any of leads I, aVL, or V6.

4-4

STJ depression >= 1.0 men and ST segment upward sloping or U- shaped, in any of leads I, aVL, or V6.

Posterior (inferior) Site (Leads II, III, aVF)

4-1-1

STJ depression >= 2.0 mm and ST segment horizontal or downward sloping in lead II or aVF.

4-1-2

STJ depression >= 1.0 mm but < 2.0 mm and ST segment horizontal or downward sloping in lead II or aVF.

4-2

STJ depression >= 0.5 mm and < 1.0 mm and ST segment horizontal or downward sloping in lead II or aVF.

4-3

No STJ depression as much as 0.5 mm, but ST segment downward sloping and segment or T-wave nadir > 0.5 mm below P-R baseline in lead II.

4-4

STJ depression >= 1.0 mm and ST segment upward sloping, or U- shaped in lead II.

Anterior Site (Leads V1, V2, V3, V4, V5)

4-1-1

STJ depression >= 2.0 and ST segment horizontal or downward sloping in any of leads V1, V2, V3, V4, V5.

4-1-2

STJ depression >= 1.0 mm but < 2.0 mm and ST segment horizontal or downward sloping in any of leads V1, V2, V3, V4, V5.

4-2

STJ depression >= 0.5 mm and < 1.0 mm and ST segment horizontal or downward sloping in any of leads V1, V2, V3, V4, V5.

4-3

No STJ depression as much as 0.5 mm, but ST segment downward sloping and segment or T-wave nadir >= 0.5 mm below P-R baseline in any of leads V2, V3, V4, V5.

4-4

STJ depression >= 1.0 mm and ST segment upward sloping or U- shaped in any of leads V1, V2, V3, V4, V5.

REFERENCE:

Prineas, R. J., Crow, R. S., & Blackburn, H. W. (1982). The Minnesota code manual of electrocardiographic findings: standards and procedures for measurement and classification. Boston, Mass: J. Wright.