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Critical Care
Published in: Critical Care 1/2020

Open Access 01-12-2020 | Research

Continuous assessment of neuro-ventilatory drive during 12 h of pressure support ventilation in critically ill patients

Authors: Rosa Di mussi, Savino Spadaro, Carlo Alberto Volta, Nicola Bartolomeo, Paolo Trerotoli, Francesco Staffieri, Luigi Pisani, Rachele Iannuzziello, Lidia Dalfino, Francesco Murgolo, Salvatore Grasso

Published in: Critical Care | Issue 1/2020

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Abstract

Introduction

Pressure support ventilation (PSV) should allow spontaneous breathing with a “normal” neuro-ventilatory drive. Low neuro-ventilatory drive puts the patient at risk of diaphragmatic atrophy while high neuro-ventilatory drive may causes dyspnea and patient self-inflicted lung injury. We continuously assessed for 12 h the electrical activity of the diaphragm (EAdi), a close surrogate of neuro-ventilatory drive, during PSV. Our aim was to document the EAdi trend and the occurrence of periods of “Low” and/or “High” neuro-ventilatory drive during clinical application of PSV.

Method

In 16 critically ill patients ventilated in the PSV mode for clinical reasons, inspiratory peak EAdi peak (EAdiPEAK), pressure time product of the trans-diaphragmatic pressure per breath and per minute (PTPDI/b and PTPDI/min, respectively), breathing pattern and major asynchronies were continuously monitored for 12 h (from 8 a.m. to 8 p.m.). We identified breaths with “Normal” (EAdiPEAK 5–15 μV), “Low” (EAdiPEAK < 5 μV) and “High” (EAdiPEAK > 15 μV) neuro-ventilatory drive.

Results

Within all the analyzed breaths (177.117), the neuro-ventilatory drive, as expressed by the EAdiPEAK, was “Low” in 50.116 breath (28%), “Normal” in 88.419 breaths (50%) and “High” in 38.582 breaths (22%). The average times spent in “Low”, “Normal” and “High” class were 1.37, 3.67 and 0.55 h, respectively (p < 0.0001), with wide variations among patients. Eleven patients remained in the “Low” neuro-ventilatory drive class for more than 1 h, median 6.1 [3.9–8.5] h and 6 in the “High” neuro-ventilatory drive class, median 3.4 [2.2–7.8] h. The asynchrony index was significantly higher in the “Low” neuro-ventilatory class, mainly because of a higher number of missed efforts.

Conclusions

We observed wide variations in EAdi amplitude and unevenly distributed “Low” and “High” neuro ventilatory drive periods during 12 h of PSV in critically ill patients. Further studies are needed to assess the possible clinical implications of our physiological findings.
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Metadata
Title
Continuous assessment of neuro-ventilatory drive during 12 h of pressure support ventilation in critically ill patients
Authors
Rosa Di mussi
Savino Spadaro
Carlo Alberto Volta
Nicola Bartolomeo
Paolo Trerotoli
Francesco Staffieri
Luigi Pisani
Rachele Iannuzziello
Lidia Dalfino
Francesco Murgolo
Salvatore Grasso
Publication date
01-12-2020
Publisher
BioMed Central
Published in
Critical Care / Issue 1/2020
Electronic ISSN: 1364-8535
DOI
https://doi.org/10.1186/s13054-020-03357-9

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