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MacAskill, W., Hoffman, B., Johnson, M.A. 
ORCID: 0000-0002-8226-9438, Sharpe, G.R. ORCID: 0000-0002-4575-2332 and Mills, D.E.,
2021.
Pressure measurement characteristics of a micro‐transducer and balloon catheters.
Physiological Reports, 9 (8): e14831.
ISSN 2051-817X
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Abstract
Respiratory pressure responses to cervical magnetic stimulation are important measurements in monitoring the mechanical function of the respiratory muscles. Pressures can be measured using balloon catheters or a catheter containing integrated micro-transducers. However, no research has provided a comprehensive analysis of their pressure measurement characteristics. Accordingly, the aim of this study was to provide a comparative analysis of these characteristics in two separate experiments: (1) in vitro with a reference pressure transducer following a controlled pressurization; and (2) in vivo following cervical magnetic stimulations. In vitro the micro-transducer catheter recorded pressure amplitudes and areas which were in closer agreement to the reference pressure transducer than the balloon catheter. In vivo there was a main effect for stimulation power and catheter for esophageal (Pes), gastric (Pga), and transdiaphragmatic (Pdi) pressure amplitudes (p < 0.001) with the micro-transducer catheter recording larger pressure amplitudes. There was a main effect of stimulation power (p < 0.001) and no main effect of catheter for esophageal (p = 0.481), gastric (p = 0.923), and transdiaphragmatic (p = 0.964) pressure areas. At 100% stimulator power agreement between catheters for Pdi amplitude (bias =6.9 cmH2O and LOA −0.61 to 14.27 cmH2O) and pressure areas (bias = −0.05 cmH2O·s and LOA −1.22 to 1.11 cmH2O·s) were assessed. At 100% stimulator power, and compared to the balloon catheters, the micro-transducer catheter displayed a shorter 10–90% rise time, contraction time, latency, and half-relaxation time, alongside greater maximal rates of change in pressure for esophageal, gastric, and transdiaphragmatic pressure amplitudes (p < 0.05). These results suggest that caution is warranted if comparing pressure amplitude results utilizing different catheter systems, or if micro-transducers are used in clinical settings while applying balloon catheter-derived normative values. However, pressure areas could be used as an alternative point of comparison between catheter systems.
| Item Type: | Journal article | ||||||
|---|---|---|---|---|---|---|---|
| Publication Title: | Physiological Reports | ||||||
| Creators: | MacAskill, W., Hoffman, B., Johnson, M.A., Sharpe, G.R. and Mills, D.E. | ||||||
| Publisher: | Wiley | ||||||
| Date: | April 2021 | ||||||
| Volume: | 9 | ||||||
| Number: | 8 | ||||||
| ISSN: | 2051-817X | ||||||
| Identifiers: |
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| Divisions: | Schools > School of Science and Technology | ||||||
| Record created by: | Laura Ward | ||||||
| Date Added: | 17 Nov 2021 16:44 | ||||||
| Last Modified: | 17 Nov 2021 16:44 | ||||||
| URI: | https://irep.ntu.ac.uk/id/eprint/44866 |
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