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Heart rate ( HR ) , mean arterial pressure ( MBP ) , positive rate of increase of left ventricular pressure ( + LVdP / dt ) , echocardiographically assessed left ventricular ejection fraction ( LVEF ) , and fractional shortening ( FS ) , as well as chronotropic response to isoproterenol and exercise - induced sympathetic stimulation were evaluated under baseline and posttreatment conditions .
 Chemical: isoproterenol
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: isoproterenol