yesterday, i'd been made mistake. When i'm flush the neck line with hepsaline at pt who is a nearly 1 year old baby, there is bubble when i withdraw little bit blood to see whether the line is functioning well or not but i didn't see the bubble properly then i pushed t back. At that time one of senior staff supervise me and she didn't stop me but let me finished it after i'd flush that line. I'd been scolded by her and she said that bubble will be harm the patient. That patient is post cardiac surgery and i was very worried until now. i'd flushed that line because i want to give antibiotic through infusion. I want to know for the sake of patient that i'm very worry about that bubble, is it really really will harm the patient? In my opinion, supposed to be she stop me from injecting back the blood after i withdraw it a little bit but she let me finish it then she scold me.. In this situation, i admitted that it was my fault because i'm not see it properly. I'm very frustrated that i had done that. After this i will see it clearly the bubble and will not inject it into line, For future, when i'm supervise the junior, i will not stand back and just shut mouth when i see my junior staff done this. I will stop it for good both of us. I will.! I pray that this patient is in good condition today. Will you all pray for this patient. Thank you for lend your ear to hear my problem.TQ