title: Outcomes of Endobronchial Valve Treatment Based on the Precise Criteria of an Endobronchial Catheter for Detection of Collateral Ventilation under Spontaneous Breathing.
abstract: BACKGROUND
  Endoscopic lung volume reduction with valves is a valid therapeutic option for COPD patients with severe emphysema. The exclusion of interlobar collateral ventilation (CV) is an important predictor of clinical success.
  
  
  OBJECTIVE
  Recently, a catheter-based endobronchial in vivo measurement system (Chartis, Pulmonx, USA) has become routine in the clinical evaluation of CV status in target lobes, but the criteria for phenotyping CV by Chartis evaluation have not yet been defined. We asked the questions, how many phenotypes can be identified using Chartis, what are the exact criteria to distinguish them, and how do the Chartis phenotypes respond to valve insertion?
  
  
  METHODS
  In a retrospective study, 406 Chartis assessments of 166 patients with severe COPD were analyzed. Four Chartis phenotypes, CV positive (CV+), CV negative (CV-), low flow (LF) and low plateau were identified. Fifty-two patients without CV were treated with valves and followed for 3 months.
  
  
  RESULTS
  The Chartis phenotypes were discriminated with respect to decline in expiratory peak flow, increase in resistance index and change in total exhaled volume after 1, 2, 3, 4 and 5 min of measurement time (p < 0.0001, ANOVA), and the cutoff criteria were defined accordingly. To examine the application of these phenotyping criteria, students applied them to 100 Chartis assessments, and they demonstrated almost perfect inter- and intraobserver agreements (x03BA; > 0.9). Compared to baseline, CV- and LF patients with ipsilateral CV- lobe showed an improvement in FEV1 (p < 0.05), vital capacity (p < 0.05) and target lobe volume reduction (p < 0.005) after valve insertion.
  
  
  CONCLUSIONS
  This study describes the most prevalent Chartis phenotypes.
authors.affiliation: Department of Internal Medicine/Infectious Diseases and Respiratory Medicine, Charitx00E9; - Universitx00E4;tsmedizin Berlin, Berlin, Germany.
authors.forename: Dominik
authors.initials: D
authors.lastname: Herzog
authors.forename: Christian
authors.initials: C
authors.lastname: Thomsen
authors.forename: Alexander
authors.initials: A
authors.lastname: Poellinger
authors.forename: Felix
authors.initials: F
authors.lastname: Doellinger
authors.forename: Nils
authors.initials: N
authors.lastname: Schreiter
authors.forename: Vera
authors.initials: V
authors.lastname: Froeling
authors.forename: Dirk
authors.initials: D
authors.lastname: Schuermann
authors.forename: Bettina
authors.initials: B
authors.lastname: Temmesfeld-Wollbruck
authors.forename: Stefan
authors.initials: S
authors.lastname: Hippenstiel
authors.forename: Norbert
authors.initials: N
authors.lastname: Suttorp
authors.forename: Ralf-Harto
authors.initials: RH
authors.lastname: Huebner
mesh_terms: D000368:Aged; D001999:Bronchoscopy / Q000379:methods*; D002404:Catheterization; D057785:Catheters; D005260:Female; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging / Q000601:surgery*; D008297:Male; D010641:Phenotype; D011013:Pneumonectomy / Q000379:methods*; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis / Q000503:physiopathology / Q000601:surgery; D011656:Pulmonary Emphysema / Q000175:diagnosis / Q000503:physiopathology / Q000601:surgery*; D012123:Pulmonary Ventilation; D012189:Retrospective Studies; D012720:Severity of Illness Index; D013525:Surgical Instruments; D014057:Tomography, X-Ray Computed