430
Alternating sinus rhythm and intermittent sinoatrial (S-A) block was observed in a 57-year-old woman, under treatment for angina with 80 mg propranolol daily.
 adverse event: treatment 
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: treatment 