Optical Detection of Intravenous Infiltration

Inclusion Criteria: * Subjects will have peripheral IV catheter with active infusions that are anticipated to be in place and functioning for 48-72 hours. The IVs and accompanying infusions are solely a part of the subject's medical care and are not started or terminated for the purposes of this Study. The rationale for choosing this time frame is that the rate of infiltration is likely to be increased the longer the IV infusion is taking place. * Subjects are admitted to one of the institution's intensive care or intermediate care units, including Adult Emergency Department, Pediatric Emergency Department, Adult Medical Intensive Care Unit, Pediatric Intensive Care Unit, Neonatal Intensive Care Unity, Surgical-Trauma Intensive Care Unit, Cardiothoracic Surgery Intensive Care Unit, Neuroscience Intensive Care Unit, Burn Intensive Care Unit, Transplant Intensive Care Unit, Coronary Care Intensive Care Unit, Post-Anesthesia Recovery Unit, Pediatric Intermediate Care Unity, Surgical Intermediate Care Unit, and Medical Intermediate Care Unit. Exclusion Criteria: * Inability to consent * Lack of a peripheral IV