3977
Epidural blood flow during prostaglandin E1 or trimethaphan induced hypotension .
 prostaglandin E1, trimethaphan, hypotension
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 prostaglandin E1, trimethaphan, hypotension