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MINNESOTA CODE 1

Q and QS Patterns

(Do not code in the presence of WPW code 6-4-1, code 6-8, code 8-2-1.)

To qualify as a Q-wave, the deflection should be at least 0.1 mV (1 mm in amplitude).

Anterolateral Site (Leads I, aVL, V6)

1-1-1

Q/R amplitude ratio >= 1/3, plus Q duration >= 0.03 sec in lead I or V6.

1-1-2

Q duration >= 0.04 sec in lead I or V6.

1-1-3

Q duration >= 0.04 sec, plus R amplitude >=3mm in lead aVL.

1-2-1

Q/R amplitude ratio >= 1/3, plus Q duration >= 0.02 sec and < 0.03 sec in lead I or V6.

1-2-2

Q duration >= 0.03 sec and < 0.04 sec in lead I or V6.

1-2-3

QS pattern in lead I. Do not code in the presence of 7-1-1.

1-3-1

Q/R amplitude ratio >= 1/5 and < 1/3 plus Q duration >= 0.02 sec and < 0.03 sec in lead I or V6.

1-3-3

Q duration >= 0.03 sec and < 0.04 sec, plus R amplitude >= 3mm in lead aVL.

1-3-8

Initial R amplitude decreasing to 2 mm or less in every beat (and absence of codes 3-2, 7-1-1, 7-2-1, or 7-3) between V5 and V6. (All beats in lead V5 must have an initial R > 2mm).

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

1-1-1

Q/R amplitude ratio >= 1/3, plus Q duration >= 0.03 sec in lead II.

1-1-2

Q duration >= 0.04 sec in lead II.

1-1-4

Q duration >= 0.05 sec in lead III, plus a Q-wave amplitude > 1.0 mm in the majority of beats in lead aVF.

1-1-5

Q duration >= 0.05 sec in lead aVF.

1-2-1

Q/R amplitude ratio >= 1/3, plus Q duration >= 0.02 sec and < 0.03 sec in lead II.

1-2-2

Q duration >= 0.03 sec and < 0.04 sec in lead II.

1-2-3

QS pattern in lead II. Do not code in the presence of 7-1-1.

1-2-4

Q duration >= 0.04 sec and < 0.05 sec in lead III, plus a Q-wave >= 1.0 mm amplitude in the majority of beats in aVF.

1-2-5

Q duration >= 0.04 sec and < 0.05 sec in lead aVF.

1-3-1

Q/R amplitude ratio >= 1/5 and < 1/3, plus Q duration >= 0.02 sec and < 0.03 sec in lead II.

1-3-4

Q duration >= 0.03 sec and < 0.04 sec in lead III, plus a Q-wave >= 1.0 mm amplitude in the majority of beats in lead aVF.

1-3-5

Q duration >= 0.03 sec and < 0.04 sec in lead aVF.

1-3-6

QS pattern in each of leads III and aVF. (Do not code in the presence of 7-1-1.)

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

1-1-1

Q/R amplitude ratio >= 1/3, plus Q duration >= 0.03 sec in any of leads V2, V3, V4, V5.

1-1-2

Q duration >= 0.04 sec in any of leads V1, V2, V3, V4, V5.

1-1-6

QS pattern when initial R-wave is present in adjacent lead to the right on the chest, in any of leads V2, V3, V4 V5, V6.

1-1-7

QS pattern in all of leads V1-V4 or V1-V5.

1-2-1

Q/R amplitude ratio >= 1/3, plus Q duration >= 0.02 sec and < 0.03 sec in any of leads V2, V3, V4, V5.

1-2-2

Q duration >= 0.03 sec and < 0.04 sec in any of leads V2, V3, V4, V5.

1-2-7

QS pattern in all of leads V1, V2, and V3. (Do not code in the presence of 7-1-1.)

1-3-1

Q/R amplitude ratio >= 1/5 and < 1/3 plus Q duration >= 0.02 sec and < 0.03 sec in any of leads V2, V3, V4, V5.

1-3-2

QS pattern in leads V1 and V2. (Do not code in the presence of 3-1 or 7-1-1.)

1-3-8

Initial R amplitude decreasing to 2.0 mm or less in every beat (and absence of codes 3-2, 7-1-1, 7-2-1, or 7-3) between any of leads V2 and V3, V3 and V4, or V4 and V5. (All beats in the lead immediately to the right on the chest must have an initial R > 2 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.