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MINNESOTA CODE 6

A-V Conduction Defect

6-1

Complete (third degree) A-V block (permanent or intermittent) in any lead. Atrial and ventricular complexes independent, and atrial rate faster than ventricular rate, with ventricular rate < 60.

6-2-1

Mobitz Type II (occurrence of P-wave on time with dropped QRS and T).

6-2-2

Partial (second degree) A-V block in any lead (2:1 or 3:1 block).

6-2-3

Wenckebach's Phenomenon (P-R interval increasing from beat to beat until QRS and T dropped).

6-3

P-R (P-Q) interval >= 0.22 sec in the majority of beats in any of leads I, II, III, aVL, aVF.

6-4-1

Wolff-Parkinson-White Pattern (WPW), persistent. Sinus P-wave. P-R interval < 0.12 sec. plus QRS duration >= 0.12 sec plus R peak duration >= 0.06 sec coexisting in the same beat and present in the majority of beats in any of leads I, II, aVL, V4, V5. V6. (6-4-1 suppresses 1-2-3, 1-2-7, 1-3-8, 1-3-2, 1-3-6, all 3, 4, 5, 9-2, 9-4, 9-5 codes.)

6-4-2

WPW Pattern, intermittent. WPW pattern in <= 50 % of beats in appropriate leads.

6-5

Short P-R interval. P-R interval < 0.12 sec in all beats of any two leads I, II, III, aVL, aVF.

6-6

Intermittent aberrant atrioventricular conduction. P-R > 0.12 sec (except in presence of 6-5 or heart rate greater than 100); and wide QRS complex > 0.12 sec; and normal P-wave when most beats are sinus rhythm. (Do not code in the presence of 6-4-2.)

6-8

Artificial pacemaker.

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.