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Dysfunction of the electrical system manifests in many ways and may include Wolff–Parkinson–White syndrome , ventricular fibrillation , and heart block .
 Wolff–Parkinson–White syndrome, ventricular fibrillation, heart block
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Wolff–Parkinson–White syndrome, ventricular fibrillation, heart block