Multiparameter urine reagent strips for bedside identification of cerebrospinal fluid in epidural catheter aspirates: a proof-of-concept observation

Abstract

Aspiration of clear fluid from an epidural catheter is a recurring, high-stakes clinical challenge. It may be residual saline from loss of resistance, local anesthetic (LA), or cerebrospinal fluid (CSF)—all visually indistinguishable. This matters because a full epidural LA dose given through an