Table 1.

Arrhythmia Score

Documented Arrhythmia		Frequency of Cardioversion
None	0	None	0
Non sustained only	1	One cardioversion	1
Sustained arrhythmia	2	AAIT cardioversions	2
Incessant	3	Two or more cardioversions	3

Arrhythmia Severity		Antiarrhythmic Medications
Asymptomatic	0	None or digoxin only	0
Palpitations only	1	Class II or class IV	1
Syncope/CHF/thrombosis	2	Class I or class III	2
Cardiac arrest	3	Amiodarone toxicity	3

Score of 0 to 12 points is calculated as the sum of the highest score achieved in each of the 4 categories on the prior 3 months of the scoring date. Thrombosis determined by either echocardiographic evidence of intracardiac thrombosis or clinical evidence of thromboembolic event. AAIT cardioversions are defined as 1 or more automatic or manual cardioversions performed using an implanted atrial pacemaker and not requiring any additional intervention. Amiodarone toxicity includes documented abnormalities of thyroid, hepatic or pulmonary function attributed by clinician to amiodarone administration, whether necessitating discontinuation of medication. CHF indicates congestive heart failure, determined by review of clinical records and/or hemodynamic measurement.