Open AccessEvaluation of the agreement of tidal breathing parameters measured simultaneously using pneumotachography and structured light plethysmography
Author(s) -
MotamediFakhr Shayan,
Iles Richard,
Barney Anna,
Boer Willem,
Conlon Jenny,
Khalid Amna,
Wilson Rachel C.
Publication year - 2017
Publication title -
physiological reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 39
ISSN - 2051-817X
DOI - 10.14814/phy2.13124
Subject(s) - repeatability , medicine , tidal volume , plethysmograph , respiratory rate , respiratory system , breathing , ventilation (architecture) , cohort , cardiology , nuclear medicine , anesthesia , heart rate , mathematics , blood pressure , physics , statistics , thermodynamics
Abstract Structured light plethysmography ( SLP ) is a noncontact, noninvasive, respiratory measurement technique, which uses a structured pattern of light and two cameras to track displacement of the thoraco–abdominal wall during tidal breathing. The primary objective of this study was to examine agreement between tidal breathing parameters measured simultaneously for 45 sec using pneumotachography and SLP in a group of 20 participants with a range of respiratory patterns (“primary cohort”). To examine repeatability of the agreement, an additional 21 healthy subjects (“repeatability cohort”) were measured twice during resting breathing and once during increased respiratory rate ( RR ). Breath‐by‐breath and averaged RR , inspiratory time ( tI ), expiratory time ( tE ), total breath time ( tT ot), tI / tE , tI / tT ot, and IE 50 (inspiratory to expiratory flow measured at 50% of tidal volume) were calculated. Bland–Altman plots were used to assess the agreement. In the primary cohort, breath‐by‐breath agreement for RR was ±1.44 breaths per minute (brpm). tI , tE , and tT ot agreed to ±0.22, ±0.29, and ±0.32 sec, respectively, and tI / tE , tI / tT ot, and IE 50/ IE 50 SLP to ±0.16, ±0.05, and ±0.55, respectively. When averaged, agreement for RR was ±0.19 brpm. tI , tE , and tT ot were within ±0.16, ±0.16, and ±0.07 sec, respectively, and tI / tE , tI / tT ot, and IE 50 were within ±0.09, ±0.03, and ±0.25, respectively. A comparison of resting breathing demonstrated that breath‐by‐breath and averaged agreements for all seven parameters were repeatable ( P > 0.05). With increased RR , agreement improved for tI , tE , and tT ot ( P ≤ 0.01), did not differ for tI / tE , tI / tT ot, and IE 50 ( P > 0.05) and reduced for breath‐by‐breath ( P < 0.05) but not averaged RR ( P > 0.05).