3239
The effects of continuous positive airway pressure ( CPAP ) on cardiovascular dynamics and pulmonary shunt ( QS / QT ) were investigated in 12 dogs before and during sodium nitroprusside infusion that decreased mean arterial blood pressure 40 - 50 per cent .
 sodium nitroprusside
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 sodium nitroprusside