Ultrasound-assessed diaphragmatic impairment is a predictor of outcomes in patients with acute exacerbation of chronic obstructive pulmonary disease undergoing noninvasive ventilation

Alessandro Marchioni, Ivana Castaniere, Roberto Tonelli, Riccardo Fantini, Matteo Fontana, Luca Tabbì, Andrea Viani, Francesco Giaroni, Valentina Ruggieri, Stefania Cerri, Enrico Clini, Alessandro Marchioni, Ivana Castaniere, Roberto Tonelli, Riccardo Fantini, Matteo Fontana, Luca Tabbì, Andrea Viani, Francesco Giaroni, Valentina Ruggieri, Stefania Cerri, Enrico Clini

Abstract

Background: Ultrasound (US) evaluation of diaphragmatic dysfunction (DD) has proved to be a reliable technique in critical care. In this single-center prospective study, we investigated the impact of US-assessed DD on noninvasive ventilation (NIV) failure in patients with acute exacerbations of chronic obstructive pulmonary disease (AECOPD) and its correlation with the transdiaphragmatic pressure assessed using the invasive sniff maneuver (Pdi sniff).

Methods: A population of 75 consecutive patients with AECOPD with hypercapnic acidosis admitted to our respiratory intensive care unit (RICU) were enrolled. Change in diaphragm thickness (ΔTdi) < 20% during tidal volume was the predefined cutoff for identifying DD+/- status. Correlations between ΔTdi < 20% NIV failure and other clinical outcomes were investigated. Correlation between ΔTdi and Pdi sniff values was analyzed in a subset of ten patients.

Results: DD+ patients had a higher risk for NIV failure than DD- patients (risk ratio, 4.4; p < 0.001), and this finding was significantly associated with higher RICU, in-hospital, and 90-day mortality rates; longer mechanical ventilation duration; higher tracheostomy rate; and longer RICU stay. Huge increases in NIV failure (HR, 6.2; p < 0.0001) and 90-day mortality (HR, 4.7; p = 0.008) in DD+ patients were found by Kaplan-Meier analysis. ΔTdi highly correlated with Pdi sniff (Pearson's r = 0.81; p = 0.004). ΔTdi < 20% showed better accuracy in predicting NIV failure than baseline pH value and early change in both arterial blood pH and partial pressure of carbon dioxide following NIV start (AUCs 0.84 to DTdi < 20%, 0.51 to pH value at baseline, 0.56 to early change in arterial blood pH following NIV start, and 0.54 to early change in partical pressure of carbon dioxide following NIV start, respectively; p < 0.0001).

Conclusions: Early and noninvasive US assessment of DD during severe AECOPD is reliable and accurate in identifying patients at major risk for NIV failure and worse prognosis.

Keywords: Diaphragmatic dysfunction; Noninvasive ventilation; Respiratory failure; Transdiaphragmatic pressure; Ultrasound.

Conflict of interest statement

Ethics approval and consent to participate

Approval from the local ethics committee of Modena was obtained (registered protocol number 839/C.E.). Written informed consent to participate was obtained from all enrolled patients or from their relatives, when appropriate.

Consent for publication

Consent for publication was obtained from all patients enrolled or from their relatives, when appropriate.

Competing interests

The authors declare that they have no competing interests with regard to any organization or entity with a financial interest in competition with the subject matter or materials discussed in this publication.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Figures

Fig. 1
Fig. 1
Study population diagram. AECOPD, NIV Noninvasive ventilation, RICU, ILD Interstitial lung disease, IOT, DD, Pdi, US Ultrasound
Fig. 2
Fig. 2
ROC analysis comparing predictors for noninvasive ventilation (NIV) failure at baseline and within 2 hours after NIV was started. ΔTdi Change in diaphragm thickness
Fig. 3
Fig. 3
a Correlation between change in diaphragm thickness (ΔTdi) and transdiaphragmatic pressure capacity measured at maximal inspiration using the sniff maneuver (Pdi sniff). b Accuracy of ΔTdi and Pdi sniff in identifying patients with diaphragmatic dysfunction (DD)
Fig. 4
Fig. 4
a Change in diaphragm thickness (ΔTdi) values at ultrasound testing and transdiaphragmatic pressure capacity measured at maximal inspiration using the sniff maneuver (Pdi sniff) values in the subgroup of ten patients tested with esophageal and gastric balloons. b Distribution of patients with ΔTdi < 20% or > 20% according to Pdi sniff. NIV Noninvasive ventilation
Fig. 5
Fig. 5
Probability of fail noninvasive ventilation (NIV) failure (a) and death (b) within the first 48 hours after admission according to the presence (+)/absence (−) of diaphragmatic dysfunction (DD) as assessed by ultrasound

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