Andreas Thelle1, Miriam Gjerdevik2, Thomas Grydeland3, Trude D Skorge4, Tore Wentzel-Larsen5, Per S Bakke6. 1. Department of Thoracic Medicine, Haukeland University Hospital, Jonas Lies vei 65, NO-5021 Bergen, Norway. Electronic address: andreas.thelle@helse-bergen.no. 2. Norwegian Registry for Long-Term Mechanical Ventilation, Department of Thoracic Medicine, Haukeland University Hospital, Jonas Lies vei 65, NO-5021 Bergen, Norway; Norwegian Registry for Chronic Obstructive Pulmonary Disease, Department of Thoracic Medicine, Haukeland University Hospital, Jonas Lies vei 65, NO-5021 Bergen, Norway. Electronic address: Miriam.Gjerdevik@igs.uib.no. 3. Department of Thoracic Medicine, Haukeland University Hospital, Jonas Lies vei 65, NO-5021 Bergen, Norway. Electronic address: thomas.grydeland@helse-bergen.no. 4. Department of Occupational Medicine, Haukeland University Hospital, Jonas Lies vei 65, NO-5021 Bergen, Norway. Electronic address: trude.duelien.skorge@helse-bergen.no. 5. Norwegian Centre for Violence and Traumatic Stress Studies, Oslo, Norway; Centre for Child and Adolescent Mental Health, Eastern and Southern Norway, P.O.Box 4623 Nydalen, NO-0405 Oslo, Norway; Centre for Clinical Research, Haukeland University Hospital,Jonas Lies vei 65, NO-5021 Bergen, Norway. Electronic address: tore.wentzel-larsen@nkvts.unirand.no. 6. Department of Clinical Science, University of Bergen, Jonas Lies vei 65, NO-5021, Norway. Electronic address: Per.Bakke@k2.uib.no.
Abstract
PURPOSE: Detailed and reliable methods may be important for discussions on the importance of pneumothorax size in clinical decision-making. Rhea's method is widely used to estimate pneumothorax size in percent based on chest X-rays (CXRs) from three measure points. Choi's addendum is used for anterioposterior projections. The aim of this study was to examine the intrarater and interrater reliability of the Rhea and Choi method using digital CXR in the ward based PACS monitors. MATERIALS AND METHODS: Three physicians examined a retrospective series of 80 digital CXRs showing pneumothorax, using Rhea and Choi's method, then repeated in a random order two weeks later. We used the analysis of variance technique by Eliasziw et al. to assess the intrarater and interrater reliability in altogether 480 estimations of pneumothorax size. RESULTS:Estimated pneumothorax sizes ranged between 5% and 100%. The intrarater reliability coefficient was 0.98 (95% one-sided lower-limit confidence interval C 0.96), and the interrater reliability coefficient was 0.95 (95% one-sided lower-limit confidence interval 0.93). CONCLUSION: This study has shown that the Rhea and Choi method for calculating pneumothorax size has high intrarater and interrater reliability. These results are valid across gender, side of pneumothorax and whether the patient is diagnosed with primary or secondary pneumothorax.
RCT Entities:
PURPOSE: Detailed and reliable methods may be important for discussions on the importance of pneumothorax size in clinical decision-making. Rhea's method is widely used to estimate pneumothorax size in percent based on chest X-rays (CXRs) from three measure points. Choi's addendum is used for anterioposterior projections. The aim of this study was to examine the intrarater and interrater reliability of the Rhea and Choi method using digital CXR in the ward based PACS monitors. MATERIALS AND METHODS: Three physicians examined a retrospective series of 80 digital CXRs showing pneumothorax, using Rhea and Choi's method, then repeated in a random order two weeks later. We used the analysis of variance technique by Eliasziw et al. to assess the intrarater and interrater reliability in altogether 480 estimations of pneumothorax size. RESULTS: Estimated pneumothorax sizes ranged between 5% and 100%. The intrarater reliability coefficient was 0.98 (95% one-sided lower-limit confidence interval C 0.96), and the interrater reliability coefficient was 0.95 (95% one-sided lower-limit confidence interval 0.93). CONCLUSION: This study has shown that the Rhea and Choi method for calculating pneumothorax size has high intrarater and interrater reliability. These results are valid across gender, side of pneumothorax and whether the patient is diagnosed with primary or secondary pneumothorax.
Authors: Johannes Rueckel; Christian Huemmer; Andreas Fieselmann; Florin-Cristian Ghesu; Awais Mansoor; Balthasar Schachtner; Philipp Wesp; Lena Trappmann; Basel Munawwar; Jens Ricke; Michael Ingrisch; Bastian O Sabel Journal: Eur Radiol Date: 2021-03-27 Impact factor: 5.315