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MINNESOTA CODE 5

T-Wave Items

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

Anterolateral Site (Leads I, aVL, V6)

5-1

T amplitude negative 5.0 mm or more in either of leads I, V6, or in lead aVL when R amplitude is >= 5.0 mm.

5-2

T amplitude negative or diphasic (positive-negative or negative- positive type) with negative phase at least 1.0 mm but not as deep as 5.0 mm in lead I or V6, or in lead aVL when R amplitude is >= 5.0 mm.

5-3

T amplitude zero (flat), or negative, or diphasic (negative-positive type only) with less than 1.0 mm in lead I or V6, or in lead aVL when R amplitude is >= 5.0 mm.

5-4

T amplitude positive and T/R amplitude ration < 1/20 in any of leads I, aVL, V6; R wave amplitude must be >= 10.0 mm.

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

5-1

T amplitude negative 5.0 mm or more in lead II, or in lead VF when QRS is mainly upright.

5-2

T amplitude negative or diphasic with negative phase (negative- positive or positive-negative type) at least 1.0 mm but not as deep as 5.0 mm in lead II, or in lead aVF when QRS is mainly upright.

5-3

T amplitude zero (flat), or negative, or diphasic (negative-positive type only) with less than 1.0 mm negative phase in lead II; not coded in lead aVF.

5-4

T amplitude positive and T/R amplitude ratio < 1/20 in lead II; R wave amplitude must be >= 10.0 mm.

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

5-1

T amplitude negative 5.0 mm or more in any of leads V2, V3, V4, V5.

5-2

T amplitude negative (flat), or diphasic (negative-positive or positive-negative type) with negative phase at least 1.0 mm but not as deep as 5.0 mm, in any of leads V2, V3, V4, V5.

5-3

T amplitude zero (flat), or negative, or diphasic (negative-positive type only) with less than 1.0 mm negative phase, in any of leads V3, V4, V5.

5-4

T amplitude positive and T/R amplitude ratio < 1/20 in any of leads V3, V4, V5; R wave amplitude must be >= 10.0 mm.

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.