Mason and Winkle used the Arrhythmia Severity Index to evaluate patients undergoing drug trials for ventricular tachyarrhythmias. The authors are from Stanford University School of Medicine.
(1) number of cardiopulmonary resuscitation episodes
(2) number of direct current cardioversion episodes
(3) number of documented arrhythmia episodes
(4) number of drugs failed in past
• Drug failure involves documented recurrence of sustained ventricular tachycardia in patients with previously sustained ventricular tachycardia, and >= 3 repetitive beats in patients with previously unsustained ventricular tachycardia.
• The length of time in the drug trial varied from only a few weeks up to 4 years.
direct current cardioversion
documented arrhythmia episodes
0 – 3 episodes
4 –7 episodes
>= 8 episodes
number of previous drug failures
0 - 1
0 - 1 time, or < 10 days
2 times, or 10-20 days
3 or more times, or >= 21 days
total score =
= SUM(points for all 5 parameters)
• minimum score: 0
• maximum score: 10
• The higher the score the more severe the ventricular tachyarrhythmia.
To read more or access our algorithms and calculators, please log in or register.