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When respiratory failure was produced by hypoventilation ( pH 7 . 05 to 7 . 25 ; PC02 70 to 100 mm Hg : P02 20 to 40 mm Hg ) , infusion of aminophylline resulted in an even greater decrease in ventricular fibrillation threshold to 60 percent of the control level .
 respiratory failure, hypoventilation, aminophylline, 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:
 respiratory failure, hypoventilation, aminophylline, ventricular fibrillation