tokens: The rats in the control group were intraperitoneally ( i . p . ) injected with 0 . 9 % saline ( 4 ml / kg ) ; the rats in the model group were i . p . injected with CYP ( 150 mg / kg ) ; and the rats in the intervention group were i . p . injected with CYP with subsequently perfusion of bladder with P2X3 and NK1 receptors ' antagonists , Suramin and GR 82334 .