Pressure measurement characteristics of a micro‐transducer and balloon catheters

MacAskill, William and Hoffman, Ben ORCID: and Johnson, Michael A. and Sharpe, Graham R. and Mills, Dean E. (2021) Pressure measurement characteristics of a micro‐transducer and balloon catheters. Physiological Reports, 9 (8):e14831. ISSN 2051-817X

Text (Published Version)
Available under License Creative Commons Attribution 4.0.

Download (932kB) | Preview


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.

Statistics for USQ ePrint 42100
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Health and Wellbeing (1 Jan 2015 - 31 Dec 2021)
Faculty/School / Institute/Centre: Current - Institute for Resilient Regions - Centre for Health Research (1 Apr 2020 -)
Date Deposited: 02 Jun 2021 04:58
Last Modified: 13 Oct 2021 00:12
Uncontrolled Keywords: balloon catheter Esophageal catheter micro-transducer catheter respiratory pressures
Fields of Research (2008): 11 Medical and Health Sciences > 1106 Human Movement and Sports Science > 110602 Exercise Physiology
11 Medical and Health Sciences > 1106 Human Movement and Sports Science > 110601 Biomechanics
Fields of Research (2020): 42 HEALTH SCIENCES > 4207 Sports science and exercise > 420701 Biomechanics
42 HEALTH SCIENCES > 4207 Sports science and exercise > 420702 Exercise physiology
Identification Number or DOI: doi:10.14814/phy2.14831

Actions (login required)

View Item Archive Repository Staff Only