12729
Of particular interest in this patient is the fluctuation of the QT interval at a stable dose of methadone , suggesting that a single normal electrocardiogram ( ECG ) does not guarantee that the patient is not at risk of ventricular arrhythmias .
 adverse effect: fluctuation of the QT interval, methadone
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: adverse effect 
Text: {0} 
 Entity Pairs:  fluctuation of the QT interval, methadone 
Answer:
 adverse effect: fluctuation of the QT interval, methadone