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MINNESOTA CODE 2

QRS Axis Deviation

(Do not code in the presence of low-voltage QRS, code 9-1, WPW 6-4-1, ventricular conduction defects, or 7-1-1, 7-2-1, and 7-4.)

2-1

Left. QRS axis from -30 degree through -90 degree in leads I, II, III. (The algebraic sum of major positive and major negative QRS waves must be zero or positive in I, negative in III, and zero or negative in II.)

2-2

Right. QRS axis from +120 degree through - 150 degree in leads I, II, III. (The algebraic sum of major positive and major negative QRS waves must be negative in I, zero or positive in III, and in I must be one- half or more of that in III.) **[or from +120 degree through +210 degree]

2-3

Right (optional code when 2-2 is not present). QRS axis from +90 degree through +119 degree in leads I, II, III. (The algebraic sum of major positive and major negative QRS waves must be zero or negative in I and positive in II and III.)

2-4

Extreme axis deviation (usually S1, S2, S3 pattern). QRS axis from -90 degree through -149 degree in leads I, II, and III. (The algebraic sum of major positive and major negative QRS waves must be negative in each of leads I, II, and III.) **[or from +210 degree through +270 degree]

2-5

Indeterminate axis. QRS axis approximately 90 degree from the frontal plane. (The algebraic sum of major positive and major negative QRS waves is zero in each of leads I, II and III, or the information from these three leads is incongruous.)

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.