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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 ,  a 57-year-old woman: Subject, 57-year-old: Subject.Age, woman: Subject.Gender, Alternating sinus rhythm and intermittent sinoatrial (S-A) block: Effect, 80 mg propranolol daily.: Treatment, 80 mg: Treatment.Dosage, propranolol: Treatment.Drug, daily: Treatment.Freq, angina: Treatment.Disorder) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: adverse event,potential therapeutic event, Arguments type: Treatment.Disorder,Treatment.Time_elapsed,Treatment.Dosage,Subject.Race,Treatment.Drug,Treatment.Route,Subject.Disorder,Treatment.Freq,Treatment,Effect,Subject.Population,Treatment.Duration,Combination.Drug,Subject,Subject.Age,Subject.Gender. 
Text: {0} 
Answer:
 ( adverse event: treatment ,  a 57-year-old woman: Subject, 57-year-old: Subject.Age, woman: Subject.Gender, Alternating sinus rhythm and intermittent sinoatrial (S-A) block: Effect, 80 mg propranolol daily.: Treatment, 80 mg: Treatment.Dosage, propranolol: Treatment.Drug, daily: Treatment.Freq, angina: Treatment.Disorder) 