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dc.contributor.advisor Bräuer, Anselm Prof. Dr.
dc.contributor.author Blecken, Christine
dc.date.accessioned 2015-11-24T12:46:41Z
dc.date.available 2015-12-01T23:50:06Z
dc.date.issued 2015-11-24
dc.identifier.uri http://hdl.handle.net/11858/00-1735-0000-0028-863F-1
dc.language.iso deu de
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject.ddc 610 de
dc.title Evaluation der Effektivität eines neuen konduktiven Wärmesystems zur Prävention perioperativer Hypothermie in der Hals-Nasen-Ohren-Chirurgie de
dc.type doctoralThesis de
dc.title.translated Evaluation of a new conductive active warming system for prevention of perioperative hypothermia in the ear, nose and throat surgery de
dc.contributor.referee Bräuer, Anselm Prof. Dr.
dc.date.examination 2015-12-01
dc.description.abstracteng Unintentional perioperative hypothermia is still a very common problem during general anaesthesia and it occurs in up to 50% in ear, nose and throat surgery (ENT). Hypothermia is associated with many complications and aggravates perioperative morbidity by impairment of wound healing, higher blood loss and a greater risk of cardiovascular ischaemic events. Active warming can reduce the risk of perioperative hypothermia. New active warming devices have to be evaluated if they are effective. In a randomized controlled study the hypothesis was tested if the new conductive warming blanket (Barrier® Easywarm®, Mölnlycke Health Care Erkrath, Germany) is better in reducing perioperative hypothermia in ENT surgery than passive insulation with a conventional hospital duvet alone. Secondary, the incidence of perioperative hypothermia during ENT surgery was evaluated. 80 patients who underwent ENT surgery with a planned operation time between 60 and 180 minutes were recruited and randomized in two groups of 40 patients. The control group was insulated with a standard hospital duvet without prewarming. The study group was prewarmed at least 30 minutes bevor induction of anaesthesia and for the whole intraoperative time with the new conductive warming blanket (Barrier® Easywarm®). Preoperative core temperature was measured sublingual using a clinical thermometer and intraoperative core temperature was measured in the esophagus by a temperature probe. For statistical analyses patients of both groups had to be excluded because they did not match the study protocol or the planned operation time. Therefore 29 patients of the study group and 32 patients of the control group could be included. Data were tested by Student’s t test or Mann-Whitney U test as appropriate and showed no difference between the groups for age, gender, body weight and height, preoperative core temperature or duration of anaesthesia or duration of procedure time. The ANOVA (repeated measures analyses of variance) and post hoc Scheffé’s test were used to analyse time depended changes in core temperature. These tests could not identify a significant higher core temperature in the study group at any time point. Furthermore, Fisher’s exact test showed no differences in the incidence of intraoperative (12 out of 29 versus 10 out of 32 patients, p=0.13) or postoperative hypothermia (12 out of 29 versus 9 out of 32 patients, p=0.30) between the groups. Overall, the incidence of perioperative hypothermia was high with 36%. In conclusion the new conductive warming blanket (Barrier® Easywarm®) was ineffective to reduce perioperative hypothermia compared to conventional passive insulation alone. Furthermore, patients who underwent ENT surgery are still at a high risk for perioperative hypothermia, which should be avoided by using effective active warming devices. de
dc.contributor.coReferee Meyer, Alexander PD Dr.Dr.
dc.subject.ger Perioperative Hypothermie de
dc.subject.ger Konduktive Wärme de
dc.subject.ger Evaluation Material de
dc.subject.ger Hals-Nasen-Ohren-Chirurgie de
dc.subject.eng perioperative hypothermia de
dc.subject.eng conductive warming de
dc.subject.eng material testing de
dc.subject.eng ENT surgery de
dc.identifier.urn urn:nbn:de:gbv:7-11858/00-1735-0000-0028-863F-1-3
dc.affiliation.institute Medizinische Fakultät de
dc.subject.gokfull Medizin (PPN619874732) de
dc.subject.gokfull Anästhesiologie (PPN619875925) de
dc.description.embargoed 2015-12-01
dc.identifier.ppn 840776853

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