title: False-positive epidural catheter aspiration tests in needle through needle combined spinal-epidural anaesthesia.
abstract: We describe two separate episodes of free aspiration of clear fluid through epidural catheters during needle-through-needle combined spinal-epidural anaesthesia in the lateral position. Although both catheters were assumed to have been located intrathecally, both subsequently gave negative test doses and were used as epidural catheters. In the second patient, the position of the catheter was investigated using contrast spiral computerised tomography scanning, which showed epidural contrast spread only. This is the first time such an occurrence has been recognised, and we consider its significance for catheter site confirmation testing in combined spinal-epidural anaesthesia.
authors.affiliation: Department of Anaesthesia, Scunthorpe and Goole NHS Trust, Cliff Gardens, Scunthorpe DN15 7BH, UK.
authors.forename: R
authors.initials: R
authors.lastname: Isaac
authors.forename: A J
authors.initials: AJ
authors.lastname: Coe
authors.forename: V P
authors.initials: VP
authors.lastname: Hornsby
mesh_terms: D000368:Aged; D000767:Anesthesia, Epidural / Q000009:adverse effects* / Q000379:methods; D000775:Anesthesia, Spinal / Q000009:adverse effects* / Q000379:methods; D019162:Anesthetics, Combined / Q000008:administration & dosage; D002404:Catheterization / Q000009:adverse effects* / Q000379:methods; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D007431:Intraoperative Complications / Q000209:etiology; D014057:Tomography, X-Ray Computed
chemical_list: D019162:Anesthetics, Combined