3249
Mean arterial pressure was decreased to 50 mm Hg for 30 minutes either by hemorrhage ( HEM , n = 7 ) or by continuous infusion of sodium nitroprusside ( SNP , n = 7 ) .
 hemorrhage, HEM, sodium nitroprusside, SNP
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 hemorrhage, HEM, sodium nitroprusside, SNP