In vivo characteristics of respiratory neuromuscular responses with balloon catheters and skin surface EMG versus a micro transducer catheter integrated with EMG electrodes

Poster


MacAskill, William, Hoffman, Ben, Sharpe, Graham, Johnson, Michael and Mills, Dean. 2019. "In vivo characteristics of respiratory neuromuscular responses with balloon catheters and skin surface EMG versus a micro transducer catheter integrated with EMG electrodes." European Respiratory Society International Congress 2019. Madrid, Spain 28 Sep - 02 Oct 2019 Sheffield, United Kingdom. https://doi.org/10.1183/13993003.congress-2019.PA761
Paper/Presentation Title

In vivo characteristics of respiratory neuromuscular responses with balloon catheters and skin surface EMG versus a micro transducer catheter integrated with EMG electrodes

Presentation TypePoster
AuthorsMacAskill, William (Author), Hoffman, Ben (Author), Sharpe, Graham (Author), Johnson, Michael (Author) and Mills, Dean (Author)
Journal or Proceedings TitleEuropean Respiratory Journal: ERS International Congress 2019 abstracts
Journal Citation54 (S63)
Article NumberPA761
Year2019
Place of PublicationSheffield, United Kingdom
Digital Object Identifier (DOI)https://doi.org/10.1183/13993003.congress-2019.PA761
Web Address (URL) of Paperhttps://erj.ersjournals.com/content/54/suppl_63
Conference/EventEuropean Respiratory Society International Congress 2019
Meeting of the European-Respiratory-Society
Event Details
European Respiratory Society International Congress 2019
Parent
European Respiratory Society International Congress
Event Date
28 Sep 2019 to end of 02 Oct 2019
Event Location
Madrid, Spain
Event Details
Meeting of the European-Respiratory-Society
Abstract

Classically, transdiaphragmatic pressure (Pdi) is measured using oesophageal and gastric balloon catheters (BC) connected to pressure transducers, while skin surface electrodes measure respiratory muscle electromyography (EMG). We compared these measurements to those from a micro-transducer catheter (MC) containing two transducers and nine electromyography electrodes (MCEMG). Eight participants twice attended the laboratory. In visit one testing was conducted with the MC followed by the BC; this order was reversed in visit two. EMG electrodes were placed on the 6–8th intercostal spaces. BC and MC were positioned identically in the oesophagus and stomach. EMG, MCEMG and Pdi were evaluated in response to maximal cervical magnetic stimulation (Pdi,tw). Pdi, tw responses were quicker (P<0.05) for MC than BC for latency (26.7±3.2 vs. 42.4±2.8 ms), 10-90% rise time (47.2±8.0 vs. 68.6±7.6 ms), maximal rate of pressure development (17.3±2 vs. 12.6±1 % gain / 10 ms), half relaxation time (69.7±16.7 vs 108.3±13.8 ms) and maximal relaxation rate (8.9±2 vs. 5.6±0.7 % loss / 10 ms). Pdi, tw was higher (P<0.05) for MC than BC (32.1±8.3 vs. 24.2±5.0 cmH2O). Within day CV for Pdi, tw for MC and BC was 6.2 vs. 6.6 %, whilst between-day CV was 11.3 vs. 9.8 %. MCEMG recorded similar latencies (6.4±2.0 vs. 6.2±2.0 ms; P=0.4) and higher amplitudes (8.1±1.3 vs. 2.5±1.4 mV; P<0.05) than EMG. Within day amplitude CV for MCEMG and BCEMG was 11.2 vs. 5.6%, whilst between-day CV was 10.9 vs. 5.6 %. These results show that MC is more responsive to changes in pressure than BC while also providing a comparable diaphragm EMG signal.

KeywordsRespiratory muscle; Lung mechanics; Experimental approaches
ANZSRC Field of Research 2020320103. Respiratory diseases
Byline AffiliationsSchool of Health and Wellbeing
Nottingham Trent University, United Kingdom
Institution of OriginUniversity of Southern Queensland
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