Expiratory Flow Limitation and Intrinsic Positive End-Expiratory Pressure at Zero Positive End-Expiratory Pressure in Patients with Adult Respiratory Distress Syndrome

2000 ◽  
Vol 161 (5) ◽  
pp. 1590-1596 ◽  
Author(s):  
ANTONIA KOUTSOUKOU ◽  
APOSTOLOS ARMAGANIDIS ◽  
CRISTIE STAVRAKAKI-KALLERGI ◽  
THEODOROS VASSILAKOPOULOS ◽  
ANDREAS LYMBERIS ◽  
...  
Keyword(s):  
Respiratory Distress Syndrome ◽  
Respiratory Distress ◽  
Adult Respiratory Distress Syndrome ◽  
Distress Syndrome ◽  
Flow Limitation ◽  
Positive End Expiratory Pressure ◽  
Expiratory Flow Limitation ◽  
Expiratory Flow

scholarly journals Airway Closure and Expiratory Flow Limitation in Acute Respiratory Distress Syndrome

2022 ◽  
Vol 12 ◽  
Author(s):  
Claude Guérin ◽  
Martin Cour ◽  
Laurent Argaud
Keyword(s):  
Acute Respiratory Distress Syndrome ◽  
Respiratory Distress Syndrome ◽  
Respiratory Distress ◽  
Distress Syndrome ◽  
Flow Limitation ◽  
Airway Closure ◽  
Opening Pressure ◽  
Expiratory Flow Limitation ◽  
Airway Opening ◽  
Expiratory Flow

Acute respiratory distress syndrome (ARDS) is mostly characterized by the loss of aerated lung volume associated with an increase in lung tissue and intense and complex lung inflammation. ARDS has long been associated with the histological pattern of diffuse alveolar damage (DAD). However, DAD is not the unique pathological figure in ARDS and it can also be observed in settings other than ARDS. In the coronavirus disease 2019 (COVID-19) related ARDS, the impairment of lung microvasculature has been pointed out. The airways, and of notice the small peripheral airways, may contribute to the loss of aeration observed in ARDS. High-resolution lung imaging techniques found that in specific experimental conditions small airway closure was a reality. Furthermore, low-volume ventilator-induced lung injury, also called as atelectrauma, should involve the airways. Atelectrauma is one of the basic tenet subtending the use of positive end-expiratory pressure (PEEP) set at the ventilator in ARDS. Recent data revisited the role of airways in humans with ARDS and provided findings consistent with the expiratory flow limitation and airway closure in a substantial number of patients with ARDS. We discussed the pattern of airway opening pressure disclosed in the inspiratory volume-pressure curves in COVID-19 and in non-COVID-19 related ARDS. In addition, we discussed the functional interplay between airway opening pressure and expiratory flow limitation displayed in the flow-volume curves. We discussed the individualization of the PEEP setting based on these findings.

Lung and chest wall mechanics in patients with acute respiratory distress syndrome, expiratory flow limitation, and airway closure

2020 ◽  
Vol 128 (6) ◽  
pp. 1594-1603 ◽  
Author(s):  
Claude Guérin ◽  
Nicolas Terzi ◽  
Louis-Marie Galerneau ◽  
Mehdi Mezidi ◽  
Hodane Yonis ◽  
...  
Keyword(s):  
Mechanical Ventilation ◽  
Distress Syndrome ◽  
Flow Limitation ◽  
Airway Closure ◽  
Positive End Expiratory Pressure ◽  
Expiratory Flow Limitation ◽  
Lung Elastance ◽  
Chest Wall Mechanics ◽  
Expiratory Flow ◽  
Better Than

Expiratory flow limitation (EFL) and airway closure (AC) were observed in 32% and 52%, respectively, of 25 patients with ARDS investigated during mechanical ventilation in supine position with a positive end-expiratory pressure of 5 cmH2O. The performance of dynamic lung elastance to detect expiratory flow limitation was good and better than that to detect airway closure. The vast majority of patients with EFL also had AC; however, AC can occur in the absence of EFL.

Recruitment Maneuvers after a Positive End-expiratory Pressure Trial Do Not Induce Sustained Effects in Early Adult Respiratory Distress Syndrome

2004 ◽  
Vol 101 (3) ◽  
pp. 620-625 ◽  
Author(s):  
Wolfgang Oczenski ◽  
Christoph Hörmann ◽  
Christian Keller ◽  
Norbert Lorenzl ◽  
Anton Kepka ◽  
...  
Keyword(s):  
Respiratory Distress Syndrome ◽  
Respiratory Distress ◽  
Adult Respiratory Distress Syndrome ◽  
Distress Syndrome ◽  
Recruitment Maneuver ◽  
Arterial Oxygen ◽  
Control Group ◽  
Venous Admixture ◽  
Positive End Expiratory Pressure ◽  
Recruitment Maneuvers

Background Recruitment maneuvers performed in early adult respiratory distress syndrome remain a matter of dispute in patients ventilated with low tidal volumes and high levels of positive end-expiratory pressure (PEEP). In this prospective, randomized controlled study the authors evaluated the impact of recruitment maneuvers after a PEEP trial on oxygenation and venous admixture (Qs/Qt) in patients with early extrapulmonary adult respiratory distress syndrome. Methods After a PEEP trial 30 consecutive patients ventilated with low tidal volumes and high levels of PEEP were randomly assigned to either undergo a recruitment maneuver or not. Data were recorded at baseline, 3 min after the recruitment maneuver, and 30 min after baseline. Recruitment maneuvers were performed with a sustained inflation of 50 cm H2O maintained for 30 s. Results Compared with baseline the ratio of the arterial oxygen partial pressure to the fraction of inspired oxygen (Pao2/Fio2) and Qs/Qt improved significantly at 3 min after the recruitment maneuver (Pao2/Fio2, 139 +/- 46 mm Hg versus 246 +/- 111 mm Hg, P < 0.001; Qs/Qt, 30.8 +/- 5.8% versus 21.5 +/- 9.7%, P < 0.005), but baseline values were reached again within 30 min. No significant differences in Pao2/Fio2 and Qs/Qt were detected between the recruitment maneuver group and the control group at baseline and after 30 min (recruitment maneuver group [n = 15]: Pao2/Fio2, 139 +/- 46 mm Hg versus 138 +/- 39 mm Hg; Qs/Qt, 30.8 +/- 5.8% versus 29.2 +/- 7.4%; control group: [n = 15]: Pao2/Fio2, 145 +/- 33 mm Hg versus 155 +/- 52 mm Hg; Qs/Qt, 30.2 +/- 8.5% versus 28.1 +/- 5.4%). Conclusion In patients with early extrapulmonary adult respiratory distress syndrome who underwent a PEEP trial, recruitment maneuvers failed to induce a sustained improvement of oxygenation and venous admixture.

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