2770
Evidence is shown in this report that adenosine was associated with dangerous worsening of arrhythmia in patients with atrial flutter .
 arrhythmia, adenosine
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: adverse effect 
Text: {0} 
Answer:
 arrhythmia, adenosine