3725
In two patients , the arrhythmia degenerated into irreversible ventricular fibrillation and both patients died .
 arrhythmia, ventricular fibrillation
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 arrhythmia, ventricular fibrillation