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Evaluation of the agreement of tidal breathing parameters measured simultaneously using pneumotachography and structured light plethysmography

Evaluation of the agreement of tidal breathing parameters measured simultaneously using pneumotachography and structured light plethysmography
Evaluation of the agreement of tidal breathing parameters measured simultaneously using pneumotachography and structured light plethysmography
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 (tTot), tI/tE, tI/tTot, and IE50 (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 tTot agreed to ±0.22, ±0.29, and ±0.32 sec, respectively, and tI/tE, tI/tTot, and IE50/IE50SLP to ±0.16, ±0.05, and ±0.55, respectively. When averaged, agreement for RR was ±0.19 brpm. tI, tE, and tTot were within ±0.16, ±0.16, and ±0.07 sec, respectively, and tI/tE, tI/tTot, and IE50 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 tTot (P ≤ 0.01), did not differ for tI/tE, tI/tTot, and IE50 (P > 0.05) and reduced for breath‐by‐breath (P < 0.05) but not averaged RR (P > 0.05).
Motamedi-Fakhr, Shayan
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Iles, Richard
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Barney, Anna
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de Boer, Willem
f1fbcabd-886b-4846-9c9d-2ce7c8ef0b6a
Conlon, Jenny
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Khalid, Amna
d4aeaa1c-d3e0-42db-a514-1a330d8fd0ef
Wilson, Rachel C.
13a4a855-b5b4-4744-91fb-d3ffec7d281d
Motamedi-Fakhr, Shayan
54878c84-9201-4562-bfbb-fb1ed8759f8b
Iles, Richard
93201d79-2474-4e8c-b16b-423b22fce2e0
Barney, Anna
bc0ee7f7-517a-4154-ab7d-57270de3e815
de Boer, Willem
f1fbcabd-886b-4846-9c9d-2ce7c8ef0b6a
Conlon, Jenny
94a51cb4-0388-4356-af6f-24f4a9b9df29
Khalid, Amna
d4aeaa1c-d3e0-42db-a514-1a330d8fd0ef
Wilson, Rachel C.
13a4a855-b5b4-4744-91fb-d3ffec7d281d

Motamedi-Fakhr, Shayan, Iles, Richard, Barney, Anna, de Boer, Willem, Conlon, Jenny, Khalid, Amna and Wilson, Rachel C. (2017) Evaluation of the agreement of tidal breathing parameters measured simultaneously using pneumotachography and structured light plethysmography. Physiological Reports, 5 (3), [e13124]. (doi:10.14814/phy2.13124).

Record type: Article

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 (tTot), tI/tE, tI/tTot, and IE50 (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 tTot agreed to ±0.22, ±0.29, and ±0.32 sec, respectively, and tI/tE, tI/tTot, and IE50/IE50SLP to ±0.16, ±0.05, and ±0.55, respectively. When averaged, agreement for RR was ±0.19 brpm. tI, tE, and tTot were within ±0.16, ±0.16, and ±0.07 sec, respectively, and tI/tE, tI/tTot, and IE50 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 tTot (P ≤ 0.01), did not differ for tI/tE, tI/tTot, and IE50 (P > 0.05) and reduced for breath‐by‐breath (P < 0.05) but not averaged RR (P > 0.05).

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Evaluation of the agreement of tidal breathing parameters measured simultaneously using pneumotachography and structured light plethysmography - Version of Record
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Accepted/In Press date: 18 December 2016
e-pub ahead of print date: 13 February 2017
Published date: 13 February 2017
Organisations: Inst. Sound & Vibration Research, Signal Processing & Control Grp

Identifiers

Local EPrints ID: 406224
URI: http://eprints.soton.ac.uk/id/eprint/406224
PURE UUID: 0dc94b0f-f032-4c1a-bab4-5415a0574aa9
ORCID for Anna Barney: ORCID iD orcid.org/0000-0002-6034-1478

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Date deposited: 10 Mar 2017 10:42
Last modified: 17 Dec 2019 01:55

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