Now he is getting well after the treatment of acute cystitis. Ultrasonogram detected his prostate had a hyperplasia. It means the tissues around prostate would interfere the full-voiding, making his bladder not to work well. Maybe this condition was related with the cause of cystitis, combining with taking care of my baby for 2 hours. Anyway, he is well now but has to check regulary his prostate and voiding function because of his old age (72 years old). Actually, before this unfortunate event, he has kept healthy a long time, so I believe he will recover soon.