3254
The delta down , which is the measure of decrease of SBP after a mechanical breath , was 20 . 3 + / - 8 . 4 and 10 . 1 + / - 3 . 8 mm Hg in the HEM and SNP groups , respectively , during hypotension ( P less than 0 . 02 ) .
 HEM, SNP, hypotension
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 HEM, SNP, hypotension