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World J Methodol. Sep 20, 2026; 16(3): 115087
Published online Sep 20, 2026. doi: 10.5662/wjm.v16.i3.115087
Published online Sep 20, 2026. doi: 10.5662/wjm.v16.i3.115087
Correlation of diaphragm thickness with pulmonary function test in Parkinson’s disease
Zeliha Cosgun, Melike Elif Kalfaoglu, Department of Radiology, Abant Izzet Baysal University, Bolu 14030, Türkiye
Emine Afsin, Department of Pulmonology, Abant Izzet Baysal University, Bolu 14030, Türkiye
Ramazan Kurul, Department of Physiotherapy in Faculty of Health Sciences, Abant Izzet Baysal University, Bolu 14030, Türkiye
Sule Aydin Turkoglu, Department of Neurology, Abant Izzet Baysal University, Bolu 14030, Türkiye
Gulali Aktas, Department of Internal Medicine, Abant Izzet Baysal University, Bolu 14030, Türkiye
Author contributions: Cosgun Z contributed to writing-original draft; Afsin E contributed to writing-first draft; Kalfaoglu ME writing-review & editing, supervision; Aktas G contributed to supervision; Cosgun Z, Afsin E, Kurul R, Turkoglu SA, and Aktas G contributed to writing and review and editing, conceptualization; Cosgun Z and Afsin E contributed to visualization, investigation, formal analysis, data curation; Afsin E, Kurul R, Turkoglu SA, and Aktas G contributed to methodology; Kurul R, Turkoglu SA, and Aktas G contributed to investigation.
AI contribution statement: Our manuscript was not AI-generated. Only ChatGPT was used for language polishing and grammar checking. No AI was involved in study design, data analysis, or result interpretation. All text and images are original, created independently by the authors.
Institutional review board statement: This prospective cohort study was approved by the Ethics Committee of our hospital (approval No: 2021/146, approval date: June 8, 2021).
Informed consent statement: Informed consent obtained from all participants before the study.
Conflict-of-interest statement: All authors declare that they have no conflict of interest to disclose.
CONSORT 2010 statement: The authors have read the CONSORT 2010 statement, and the manuscript was prepared and revised according to the CONSORT 2010 statement.
Data sharing statement: All data generated during this work is available by the corresponding author on reasonable requests.
Corresponding author: Gulali Aktas, Chief Physician, Professor, Department of Internal Medicine, Abant Izzet Baysal University, Golkoy, Bolu 14030, Türkiye. draliaktas@yahoo.com
Received: October 13, 2025
Revised: November 4, 2025
Accepted: December 23, 2025
Published online: September 20, 2026
Processing time: 276 Days and 3.8 Hours
Revised: November 4, 2025
Accepted: December 23, 2025
Published online: September 20, 2026
Processing time: 276 Days and 3.8 Hours
Core Tip
Core Tip: In addition to motor impairments, Parkinson’s disease is also associated with respiratory dysfunction. This study investigated the relationship between diaphragm thickness measured by ultrasound and pulmonary function test (PFT) parameters. The results demonstrated significant correlations, particularly in advanced-stage patients, between diaphragm thickness and PFT values. Ultrasound-based diaphragm assessment may serve as a promising non-invasive alternative for monitoring respiratory function in Parkinson’s patients who are unable to perform PFTs.