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BACKGROUND: The use of esophageal catheters with microtransducer promises advantages over traditional catheters with air-filled balloons. However, performance comparisons between these 2 types of catheters are scarce and incomplete.
METHODS: A catheter with a 9.5-cm air-filled balloon at the distal tip and a catheter with a microtransducer mounted within a flexible silicone rubber were tested in vitro and in vivo. In vitro, the response times of both catheters were compared, and the drift of the baseline pressure of the microtransducer catheter was evaluated over a 6-h period. In vivo, 11 healthy volunteers had both catheters inserted, and the drift of the baseline esophageal pressure was measured over a 3-h period. Also, the correlation and agreement of the baseline and changes in the esophageal pressure of both catheters were evaluated.
RESULTS: In vitro, the microtransducer catheter had a response time significantly higher (262 × 114 Hz, P < .01) and a good pressure stability, with a mean baseline pressure drift of 1.4 cm H2O. In vivo, both catheters presented a small and similar baseline esophageal pressure drift (P = 0.08). For measurements of baseline and changes in esophageal pressure, the correlation and agreement between the catheters were poor, with a large bias between them.
CONCLUSIONS: The catheter with the microtransducer had a small baseline pressure drift, similar to the air-filled balloon catheter. The low agreement between the catheters does not allow the microtransducer catheter to be used as a surrogate for the traditional air-filled balloon catheter.
- respiratory muscles/physiology
- Correspondence: Pedro Caruso MD PhD, Avenida Dr Enéas de Carvalho Aguiar, 45. 5° andar, bloco 2, sala 1, 05403-900 São Paulo-SP, Brazil. E-mail: .
This study was supported and funded by Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP) Grant 2013/02874-8. FAPESP is a governmental non-profit agency. The authors have disclosed no conflicts of interest.
Mr Maloni presented a version of this paper at the International Congress of the European Respiratory Society, held September 6-10, 2014, in Munich, Germany.
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