The line carrying the drug may be threaded under the skin to emerge at the front of the patient , a process called tunneling , and is recommended with long term use so as to reduce the chance of any infection at the exit site reaching the epidural space .
The line carrying the drug may be threaded under the skin to emerge at the front of the patient , a process called tunneling . 
 This is recommended with long term use so as to reduce the chance of any infection at the exit site reaching the epidural space .