• Kenneth I Berger, Ori Adam, Roberto Walter Dal Negro, David A Kaminsky, Robert J Shiner, Felip Burgos, de JonghFrans H CFHCDepartment of Pulmonary Function, Medisch Spectrum Twente, Enschede, The Netherlands., Inon Cohen, and Jeffrey J Fredberg.
• Division of Pulmonary Critical Care and Sleep Medicine, NYU Grossman School of Medicine, Bellevue Hospital, New York, NY; André Cournand Pulmonary Physiology Laboratory, Bellevue Hospital, New York, NY. Electronic address: Kenneth.berger@nyumc.org.
• Chest. 2021 Jun 1; 159 (6): 235623652356-2365.

BackgroundCurrent techniques for measuring absolute lung volumes rely on bulky and expensive equipment and are complicated to use for the operator and the patient. A novel method for measurement of absolute lung volumes, the MiniBox method, is presented.Research QuestionAcross a population of patients and healthy participants, do values for total lung capacity (TLC) determined by the novel compact device (MiniBox, PulmOne Advanced Medical Devices, Ltd.) compare favorably with measurements determined by traditional whole body plethysmography?Study Design And MethodsA total of 266 participants (130 men) and respiratory patients were recruited from five global centers (three in Europe and two in the United States). The study population comprised individuals with obstructive (n = 197) and restrictive (n = 33) disorders as well as healthy participants (n = 36). TLC measured by conventional plethysmography (TLCPleth) was compared with TLC measured by the MiniBox (TLCMB).ResultsTLC values ranged between 2.7 and 10.9 L. The normalized root mean square difference (NSD) between TLCPleth and TLCMB was 7.0% in healthy participants. In obstructed patients, the NSD was 7.9% in mild obstruction and 9.1% in severe obstruction. In restricted patients, the NSD was 7.8% in mild restriction and 13.9% in moderate and severe restriction. No significant differences were found between TLC values obtained by the two measurement techniques. Also no significant differences were found in results obtained among the five centers.InterpretationTLC as measured by the novel MiniBox system is not significantly different from TLC measured by conventional whole body plethysmography, thus validating the MiniBox method as a reliable method to measure absolute lung volumes.Copyright © 2021 American College of Chest Physicians. Published by Elsevier Inc. All rights reserved.

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