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MINNESOTA CODE 8

Arrhythmias

8-1-1

Presence of frequent atrial or junctional premature beats (10% or more of recorded complexes).

8-1-2

Presence of frequent ventricular premature beats (10% or more of recorded complexes).

8-1-3

Presence of both atrial and/or junctional premature beats and ventricular premature beats (so that individual frequencies are < 10% but combined premature beats are >= 10% of complexes).

8-1-4

Wandering atrial pacemaker.

8-1-5

Presence of 8-1-2 and 8-1-4.

8-2-1

Ventricular fibrillation or ventricular asystole.

8-2-2

Persistent ventricular (idioventricular) rhythm with no codable segment, regardless of rate.

8-2-3

Intermittent ventricular tachycardia. Three or more consecutive ventricular premature beats occurring at a rate >= 100. This includes more persistent ventricular tachycardia.

8-2-4

Ventricular parasystole (should not be coded in presence of 8-3-1).

8-3-1

Atrial fibrillation (persistent).

8-3-2

Atrial flutter (persistent).

8-3-3

Intermittent atrial fibrillation (code if 3 or more clear-cut, consecutive sinus beats are present in any lead).

8-3-4

Intermittent atrial flutter (code if 3 or more clear-cut, consecutive sinus beats are present in any lead).

8-4-1

Supraventricular rhythm (persistent). QRS duration < 0.12 sec; and absent P-waves or presence of abnormal P-waves (inverted or flat in aVF); and regular rhythm.

8-4-2

Supraventricular tachycardia (intermittent). Three consecutive atrial or junctional premature beats occurring at a rate >= 100.

8-5-1

Sinoatrial arrest. Unexpected absence of P, QRS and T, plus an R-R interval at a fixed multiple of the normal interval, +/- 10%.

8-5-2

Sinoatrial block. Unexpected absence of P, QRS and T, preceded by progressive shortening of P-P intervals. R-R interval at a fixed multiple of the normal interval, +/- 10%.

8-6-1

A-V dissociation with ventricular pacemaker (without capture). Requires: P-P and R-R occur at variable rates with ventricular rate as fast as, or faster than the atrial rate, plus variable P-R intervals, plus no capture beats.

8-6-2

A-V dissociation with ventricular pacemaker (with capture).

8-6-3

A-V dissociation with atrial pacemaker (without capture).

8-6-4

A-V dissociation with atrial pacemaker (with capture).

8-7

Sinus tachycardia (over 100/min).

8-8

Sinus bradycardia (under 50/min).

8-9

Other arrhythmias. Heart rate may be recorded as a continuous variable.

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.