Children ages 3-17 who are undergoing port access receive both standard care, topical
medicine for numbing (LMX4), and the study intervention which utilizes ultrasound to speed
the onset of LMX4 from 30 minutes to 5 minutes. The procedures will be performed on 2
separate visits to the clinic. The child's pain with the access procedure is evaluated.
- Children ages 3-17 with subcutaneous port
- Emergent need for port access
- Allergy to lidocaine sodium lauryl sulfate