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MINNESOTA CODE 7

Ventricular Conduction Defect

7-1-1

Complete left bundle branch block (LBBB). (Do not code in presence of 6-1, 6-4-1, 6-8, 8-2-1 or 8-2-2.) QRS duration >= 0.12 sec in a majority of beats (of the same QRS pattern) in any of leads I, II, III, aVL, aVF, plus R peak duration >= 0.06 sec in a majority of beats (of the same QRS pattern) in any of leads I, II, aVL, V5. V6. (7-1-1 suppresses 1-2-3, 1-2-7, 1-3-2, 1-3-8, 1-3-6 and all 2, 3, 4, 5, 9-2, 9-4, 9-5 codes. If any other codable Q-wave coexists with the LBBB pattern, code the Q and diminish the 7-1-1 code to a 7-4 code.)

7-1-2

Intermittent left bundle branch block. Same as 7-1-1 but with presence of normally conducted QRS complexes of different shape than the LBBB pattern.

7-2-1

Complete right bundle branch block (RBBB). (Do not code in the presence of 6-1, 6-4-1, 6-8, 8-2-1 or 8-2-2.) QRS duration >= 0.12 sec in a majority of beats (of the same QRS pattern) in any of leads I, II, III, aVL, aVF, plus: R' > R in V1 or QRS mainly upright, plus R peak duration >= 0.06 sec in V1 or V2, or S duration > R duration in all beats in lead I or II. (Suppresses 1-3-8, all 2, 3, 4, and 5 codes, 9-2, 9-4, 9-5.)

7-2-2

Intermittent right bundle branch block. Same as 7-2-1 but with presence of normally conducted QRS complexes of different shape than the RBBB pattern.

7-3

Incomplete right bundle branch block. QRS duration < 0.12 sec in each of leads I, II, III, aVL, aVF, and R' > R in either of leads V1, V2. (Code as 3-2 in addition if those criteria are met. 7-3 suppresses code 1-3-8.)

7-4

Intraventricular block. QRS duration >= 0.12 sec in a majority of beats in any of leads I, II, III, aVL, aVF. (7-4 suppresses all 2, 3, 4, 5, 9-2, 9-4, 9-5 codes.)

7-5

R-R' pattern in either of leads V1, V2 with R.' amplitude <= R.

7-6

Incomplete left bundle branch block. (Do not code in the presence of any codable Q- or QS-wave.) QRS duration >= 0.10 sec and < 0.12 sec in the majority of beats of each of leads I, aVL, and V5 or V6.

7-7

Left anterior hemiblock (LAH). QRS duration < 0.12 sec in the majority of beats in leads I, II, III, aVL, aVF, plus Q-wave amplitude >= 0.25 mm and < 0.03 sec duration in lead I, plus left axis deviation of -45 degree or more negative. (In presence of 7-2, code 7-8 if axis is < -45 degree and the Q-wave in lead I meets the above criteria.)

7-8

Combination of 7-7 and 7-2.

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.