title: Skin conductance as a pain assessment tool during chest tube removal: An observational study.
abstract: Skin conductance variability to assess pain has shown varying results. Skin conductance responses per second (SCR) during a standardized painful stimulus in awake adults may give further understanding of the method's validity. The purpose of this study was to validate the SCR with the visual analogue scale (VAS) for pain (P-VAS) and anxiety (A-VAS) during chest tube removal (CTR).
  
  
  
  Ninety-five patients receiving epidural or non-epidural treatment, scheduled for CTR, were studied. Pain or anxiety was considered when VAS > 30 mm; the SCR cut-off value reflecting pain was ≥0.2 SCR.
  
  
  
  SCR values could not be recorded in eight cases before CTR, six cases during CTR and seven cases after CTR. CTR induced increases in SCR, P-VAS and A-VAS (p < 0.001). Seventy-seven percent of all pairs of P-VAS and SCR values were well-classified; P-VAS ≤ 30 mm and SCR < 0.2 or P-VAS > 30 mm and SCR ≥ 0.2. SCR obtained before CTR differentiates between patients with and without pain during CTR in all patients (p = 0.04) and in the subgroup of non-anxious patients (p = 0.02), but not in the subgroup of anxious patients. SCR obtained during CTR had similar values in patients with and without pain in all patients and in the subgroup of anxious patients, but in the subgroup of non-anxious patients SCR during CTR differentiates patients with and without pain (p = 0.009).
  
  
  
  SCR increases during painful procedures. Preprocedural SCR may help predict reported pain in patients exposed to painful procedures. SCR during CTR differentiates between patients with and without pain only in non-anxious patients.
  
  
  
  Preprocedural SCR may help predict reported pain in patients exposed to painful procedures. Procedural SCR accuracy improves in a subgroup of non-anxious patients. P-VAS is influenced by anxiety different from SCR.
authors.affiliation: The Simulation Center, Division of Emergencies and Critical Care, Institute of Clinical Medicine, University of Oslo, Norway.
authors.forename: J O
authors.initials: JO
authors.lastname: Hansen
authors.affiliation: The Simulation Center, Division of Emergencies and Critical Care, Institute of Clinical Medicine, University of Oslo, Norway.
authors.forename: H
authors.initials: H
authors.lastname: Storm
authors.affiliation: Department of Anesthesiology, Hôpital Foch, Suresnes, France.|Université Versailles Saint-Quentin en Yvelines, France.
authors.forename: A
authors.initials: A
authors.lastname: Boglino-Hörlin
authors.affiliation: Department of Anesthesiology, Hôpital Foch, Suresnes, France.|Université Versailles Saint-Quentin en Yvelines, France.
authors.forename: M
authors.initials: M
authors.lastname: Le Guen
authors.affiliation: Department of Anesthesiology and Critical Care Medicine, Hôpital Saint Louis-Lariboisière-Fernand Widal, Paris, France.|UMR-S 942, INSERM, University Paris 7, Diderot, France.
authors.forename: E
authors.initials: E
authors.lastname: Gayat
authors.affiliation: Department of Anesthesiology, Hôpital Foch, Suresnes, France.|Université Versailles Saint-Quentin en Yvelines, France.
authors.forename: M
authors.initials: M
authors.lastname: Fischler
mesh_terms: D000328:Adult; D000368:Aged; D001007:Anxiety / Q000503:physiopathology; D015505:Chest Tubes; D020878:Device Removal / Q000009:adverse effects*; D005260:Female; D005712:Galvanic Skin Response / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010146:Pain / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology; D010147:Pain Measurement / Q000379:methods; D011446:Prospective Studies