Education: Images in Anesthesiology  |   October 2016
Electrical Impedance Tomography Visualizes Impaired Ventilation Due to Hemidiaphragmatic Paresis after Interscalene Brachial Plexus Block
Author Notes
  • From the Department of Anesthesiology, ACQUA Clinic, Leipzig, Germany (M.W.); Swisstom AG, Landquart, Switzerland (S.H.); and the Department of Anesthesiology and Intensive Care Medicine, University Hospital Leipzig, Leipzig, Germany (S.H., H.W., A.W.R.).
  • M.W. and S.H. contributed equally to this work.
    M.W. and S.H. contributed equally to this work.×
  • Address correspondence to Dr. Reske: awreske@gmail.com
Article Information
Education / Images in Anesthesiology / Central and Peripheral Nervous Systems / Regional Anesthesia / Respiratory System
Education: Images in Anesthesiology   |   October 2016
Electrical Impedance Tomography Visualizes Impaired Ventilation Due to Hemidiaphragmatic Paresis after Interscalene Brachial Plexus Block
Anesthesiology 10 2016, Vol.125, 807. doi:10.1097/ALN.0000000000001168
Anesthesiology 10 2016, Vol.125, 807. doi:10.1097/ALN.0000000000001168
ELECTRICAL impedance tomography (EIT) uses electrode belts to apply minimal electrical currents on the thorax from which images of pulmonary ventilation are derived. Ventilation and impedance changes (dZ) are directly correlated.1  The color of each pixel of an EIT image (fig.) represents the amount of local ventilation, where whitish colors relate to high ventilation and dark ones to little ventilation.
With the patients’ consent, data were acquired before interscalene brachial plexus block (pre-ISB), in the postanesthesia care unit (PACU), and during a visit on seventh postoperative day (POD) using the EIT device Swisstom BB2 (Swisstom, Landquart, Switzerland). Three men (American Society of Anesthesiologists Physical Status Classification II-III; body mass index, 26.6–32.9 kg/m2; age, 47–62 yr) received sonography-guided single-shot ISB (20 ml ropivacaine 0.75%) before general anesthesia for shoulder arthroscopy.
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