730
The failure of therapy with disopyramide and mexiletine to reproduce this observation suggests either a previously unreported electrophysiologic effect of, or idiosyncratic response to, procainamide.
 adverse event: response 
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: adverse event, potential therapeutic event 
Text: {0} 
Answer:
 adverse event: response 