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Research ArticleOriginal Research

Use of High-Flow Nasal Cannula Oxygen Therapy in Subjects With ARDS: A 1-Year Observational Study

Jonathan Messika, Karim Ben Ahmed, Stéphane Gaudry, Romain Miguel-Montanes, Cédric Rafat, Benjamin Sztrymf, Didier Dreyfuss and Jean-Damien Ricard
Respiratory Care February 2015, 60 (2) 162-169; DOI: https://doi.org/10.4187/respcare.03423
Jonathan Messika
Assistance Publique-Hôpitaux de Paris, Hôpital Louis Mourier, Service de Réanimation Médico-Chirurgicale, Colombes, France.
Institut National de la Santé et de la Recherche Médicale, Infection, Antimicrobiens, Modélisation, Evolution, Unité Mixte de Recherche 1137, Paris, France and with Université Paris Diderot, Infection, Antimicrobiens, Modélisation, Evolution, Unité Mixte de Recherche 1137, Sorbonne Paris Cité, Paris, France.
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Karim Ben Ahmed
Assistance Publique-Hôpitaux de Paris, Hôpital Louis Mourier, Service de Réanimation Médico-Chirurgicale, Colombes, France.
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Stéphane Gaudry
Assistance Publique-Hôpitaux de Paris, Hôpital Louis Mourier, Service de Réanimation Médico-Chirurgicale, Colombes, France.
Institut National de la Santé et de la Recherche Médicale, Infection, Antimicrobiens, Modélisation, Evolution, Unité Mixte de Recherche 1137, Paris, France and with Université Paris Diderot, Infection, Antimicrobiens, Modélisation, Evolution, Unité Mixte de Recherche 1137, Sorbonne Paris Cité, Paris, France.
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Romain Miguel-Montanes
Assistance Publique-Hôpitaux de Paris, Hôpital Louis Mourier, Service de Réanimation Médico-Chirurgicale, Colombes, France.
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Cédric Rafat
Assistance Publique-Hôpitaux de Paris, Hôpital Louis Mourier, Service de Réanimation Médico-Chirurgicale, Colombes, France.
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Benjamin Sztrymf
Assistance Publique-Hôpitaux de Paris, Hôpital Antoine Béclère, Service de Réanimation Médico-Chirurgicale, Clamart, France.
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Didier Dreyfuss
Assistance Publique-Hôpitaux de Paris, Hôpital Louis Mourier, Service de Réanimation Médico-Chirurgicale, Colombes, France.
Institut National de la Santé et de la Recherche Médicale, Infection, Antimicrobiens, Modélisation, Evolution, Unité Mixte de Recherche 1137, Paris, France and with Université Paris Diderot, Infection, Antimicrobiens, Modélisation, Evolution, Unité Mixte de Recherche 1137, Sorbonne Paris Cité, Paris, France.
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Jean-Damien Ricard
Assistance Publique-Hôpitaux de Paris, Hôpital Louis Mourier, Service de Réanimation Médico-Chirurgicale, Colombes, France.
Institut National de la Santé et de la Recherche Médicale, Infection, Antimicrobiens, Modélisation, Evolution, Unité Mixte de Recherche 1137, Paris, France and with Université Paris Diderot, Infection, Antimicrobiens, Modélisation, Evolution, Unité Mixte de Recherche 1137, Sorbonne Paris Cité, Paris, France.
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  • For correspondence: [email protected]
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Abstract

BACKGROUND: Beneficial effects of high-flow nasal cannula (HFNC) oxygen on oxygenation and respiratory parameters have been reported in a small number of subjects with acute respiratory failure (ARF). We aimed to evaluate its effect in subjects with ARDS.

METHODS: This was an observational single-center study. Prospectively obtained data were retrospectively analyzed. All patients admitted over 1 y to a university hospital medicosurgical ICU were included. Classification was according to the highest ventilatory support required. HFNC indications were reviewed, and demographics, clinical characteristics, and course of subjects with ARDS according to intubation need were compared.

RESULTS: Of 607 subjects admitted, 560 required ventilatory or oxygen support, among whom 180 received noninvasive ventilatory support. HFNC was used in 87 subjects and as first-line treatment in 51 subjects (29% of first-line noninvasively treated subjects), 45 of which had ARDS (PaO2/FIO2 of 137 mm Hg; 22 men, 57.9 y of age). Pneumonia accounted for 82% of ARDS causes. The intubation rate in these subjects was 40%. Higher Simplified Acute Physiology Score II (SAPS II; 46 vs 29, P = .001), occurrence of additional organ failure (76% vs 26%, P = .002), mainly hemodynamic (50% vs 7%, P = .001) or neurological (22% vs 0, P = .01), and trends toward lower PaO2/FIO2 and higher breathing frequency after HFNC initiation were evidenced in subjects who failed HFNC. Higher SAPS II scores were associated with HFNC failure in multivariate analysis.

CONCLUSIONS: In daily care, over one fourth of subjects requiring noninvasive ventilatory support were treated via HFNC, with a high success rate in subjects with severe ARDS. We conclude that HFNC may be considered as first-line therapy in ARF, including patients with ARDS.

  • acute respiratory failure
  • high flow
  • oxygen therapy
  • noninvasive ventilation
  • outcome

Introduction

Acute respiratory failure (ARF) requiring mechanical ventilation is one of the major reasons for ICU admission. To limit hazards associated with invasive mechanical ventilation, noninvasive ventilation (NIV) is increasingly used as an efficient alternative, especially in acute-on-chronic respiratory failure. Regarding de novo ARF, results with NIV are more mitigated,1 although some reports have shown benefits in acute lung injury and subjects with ARDS.2 In addition, several drawbacks with NIV, such as patient intolerance and discomfort,3 lead to its early interruption in up to 22% of patients.4 Finally, with the exception of hypercapnic encephalopathy, NIV cannot be used in patients with neurological impairment. In these situations, conventional oxygen therapy is the only option before tracheal intubation. However, additional oxygen administration also has its caveats. These include limited flow, imprecise and limited FIO2, intolerance due to dryness of the inspired gases, and claustrophobia due to the face mask.5 A new technique has emerged from the neonatal field (where it has shown very promising results6) that counteracts most of the drawbacks associated with conventional oxygen therapy7,8: high-flow nasal cannula (HFNC) oxygen consists of the delivery of high (50–60 L/min), heated, and humidified oxygen flow at a chosen FIO2 via a wide-bore nasal cannula. This high oxygen flow allows inspiratory flow increases in hypoxemic patients to be monitored. Oxygen dilution is therefore minimized, and the delivered FIO2 is close to the set FIO2.7 Physiological effects of HFNC include nasopharyngeal carbon dioxide washout, decrease in inspiratory resistance, alleviation of dyspnea, and reduced work of breathing.7,9 Recent reports have highlighted the beneficial effects of HFNC in ICU patients with hypoxemic ARF.10–12 Similar effects have been reported in the emergency department.13 Not only does HFNC rapidly alleviate respiratory distress in these patients, but sustained effects have been reported, after patients were managed for several days with this technique.10,11,14 Although these studies showed positive results, the applicability and generalization of this technique remain unclear because studies are limited to the very short-term impact of HFNC,15 subjects with mild-to-moderate respiratory failure,12 and a small number of subjects with potential selection bias.10,11 Indications for HFNC are not as well defined as for NIV, ranging from palliative situations14,16,17 to pulmonary infections18 or cardiac failure.19 There is no precise view on this technique's exact place in the therapeutic arsenal of ARF, in particular regarding the most severe patients, those with ARDS. In addition, few studies have compared NIV and HFNC. To date, the only study comparing HFNC with NIV was performed in subjects with mild respiratory failure12; a large randomized controlled trial in more severe patients has just been completed (FLORALI trial, ClinicalTrials.gov identifier NCT01320384). We thus sought to answer the following questions: in a general medicosurgical ICU, outside a research protocol, how effective is HFNC in treating patients with ARDS; how often is HFNC used in comparison with other forms of ventilatory support (invasive and noninvasive ventilation) using conventional face mask and nasal prong oxygen delivery; and with which indications and success rate?

QUICK LOOK

Current knowledge

Heated and humidified oxygen via high-flow nasal cannula reduces ventilatory requirements by flushing the anatomical dead space and improves oxygenation by meeting inspiratory flow demands. Heat and humidity allow the high flows to be tolerated and improve patient comfort.

What this paper contributes to our knowledge

Of one fourth of subjects requiring noninvasive ventilatory support for acute respiratory failure, heated and humidified high-flow oxygen prevented intubation in half. Heated high-flow oxygen via nasal cannula can be employed for first-line treatment of ARDS in patients who do not require emergent intubation.

Methods

Study Design

This was an observational, 1-y, single-center study in a 12-bed university hospital medicosurgical ICU. Every incoming patient was prospectively integrated in a large multi-center database (CUB-Réa) that includes usual demographics, past and present medical history, comorbidities, anamnestic information, and reason for and use of any ventilatory support as well as its precise duration. Clinical and biological data are included in this database.

Ethics

The ethics committee of the Société de Réanimation de Langue Française (French Society of Intensive Care Medicine) approved this study (number 12-363). Informed consent was not requested due to the purely observational design of our study and the routine use of HFNC in our unit. However, subjects and/or families were informed of the study, its purpose, and objectives.

Ventilatory Support Classification

To determine how often HFNC was used in comparison with other forms of ventilatory support, subjects were classified according to the highest support received: (1) intubation and mechanical ventilation before ICU admission (intubation was performed in a prehospital setting, operating room, or emergency department of a referral hospital); (2) immediate (< 6 h) or (3) delayed (> 6 h) intubation after ICU admission; (4) intubation following HFNC or NIV (defining HFNC or NIV failure); (5) exclusive use of NIV; (6) use of HFNC; (7) combination of NIV and HFNC; (8) conventional oxygen delivery via a face mask (≥ 6 L/min) or (9) nasal prongs (< 6 L/min); or (10) no oxygen at all.

Routine Management of ARF

In our unit, management of ARF includes the use of tracheal intubation, NIV, HFNC, and conventional oxygen therapy delivered via high-FIO2, non-rebreathing, bag reservoir face masks.

All subjects were managed according to our protocol (Fig. 1). We follow classic indications for tracheal intubation, including respiratory arrest, respiratory pauses with loss of consciousness, psychomotor agitation making nursing care impossible and requiring sedation, hemodynamic instability despite vasopressor administration and with systolic arterial pressure below 70 mm Hg, PaO2 below 45 mm Hg, loss of consciousness, or worsening encephalopathy.20 In the absence of indications for immediate tracheal intubation, NIV is used in case of acute-on-chronic hypercapnic respiratory failure. HFNC is used in de novo respiratory failure when patients require > 9 L/min oxygen with a conventional face mask to maintain SpO2 at > 92%.10 Patients are closely monitored to detect muscle fatigue, desaturation despite full use of the device, or any other signs indicating the need for urgent tracheal intubation.

Fig. 1.
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Fig. 1.

Management protocol of subjects with acute respiratory failure (ARF) used in our unit. This figure illustrates the routine protocol applied to patient management in case of ARF. High-flow nasal cannula (HFNC) is the first-line treatment used in de novo ARF. NIV = noninvasive ventilation.

Oxygen Delivery

The HFNC device (Optiflow, Fisher & Paykel, Auckland, New Zealand) consists of an air-oxygen blender with adjustable FIO2 (0.21–1.0) that delivers a modifiable gas flow (up to 60 L/min) to a heated chamber (MR 850 pass-over humidifier, Fisher & Paykel), where the gas is heated and humidified. The gas mixture is then routed through a high-performance circuit (RT 310, Fisher & Paykel) to be delivered at 37°C containing 44 mg H2O/L to the patient via short, wide-bore binasal prongs. Conventional oxygen was given through a high-FIO2, non-rebreathing face mask (Hudson RCI/Teleflex Medical, Research Triangle Park, North Carolina).

Definition of ARDS in Nonventilated Subjects

The new definition of ARDS requires that arterial blood gases be performed under at least 5 cm H2O positive pressure to assess PaO2/FIO2 and qualify ARDS severity.21 However, the natural history of ARDS does not begin immediately upon intubation, and many patients require intubation precisely because of ARDS, which is officially confirmed with PaO2/FIO2 measured after initiation of mechanical ventilation with at least 5 cm H2O positive pressure. Thus, all subjects who had a history of ARF within 1 week of a known clinical insult, with PaO2/FIO2 below 300 mm Hg and bilateral opacities evidenced on chest x-ray not fully explained by cardiac failure or fluid overload,21 were considered to have ARDS.

Statistical Analysis

Data were analyzed with Prism 4 (GraphPad Software, San Diego, California). Subjects' demographics, clinical variables, and laboratory findings were expressed as median (interquartile range). Subjects' continuous variables were compared according to failure or success of HFNC using the Mann-Whitney U test or the paired t test when appropriate. The chi-square test was used when comparing proportions. To identify factors associated with HFNC failure, we selected variables by univariate analysis (P < .1) and entered them in a stepwise logistic regression analysis. P < .05 was considered statistically significant.

Results

Between September 2010 and August 2011, 607 consecutive subjects were admitted to our ICU, with a median age 62 (46–75) y and a median Simplified Acute Physiology Score II (SAPS II) score of 39 (27–53).

Figure 2 details the ventilatory support received by the subjects. Eighty-seven subjects received HFNC at least once during their ICU stay; of these, 51 subjects received HFNC as first-line treatment for respiratory failure. NIV was used as first-line treatment for respiratory failure in 88 subjects; of these, 76 subjects received NIV as the highest ventilatory support. Oxygen therapy of ≥ 6 L/min was necessary for 36 subjects. Overall, HFNC was the first-line noninvasive treatment for 29% of subjects with respiratory failure (see Fig. 2 for details). Of the subjects requiring invasive ventilation after ICU admission (n = 126), the majority were intubated within the first 6 h of admission (n = 88, 70%). Finally, 177 subjects (30%) were intubated before ICU admission.

Fig. 2.
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Fig. 2.

Subject flow chart of all admissions during the study period. Multiple oxygenation techniques may have been used in a single subject. Overall, high-flow nasal cannula (HFNC) was the first-line noninvasive treatment for 29% of respiratory failure subjects: 51 (first-line HFNC)/[51 (first-line HFNC) + 88 (NIV) + 36 (oxygen mask)] = 29%. * Detailed HFNC use of these 87 subjects is shown in Figure 3. NIV = noninvasive ventilation.

HFNC Subjects

Figure 3 depicts the different uses of HFNC. The main use of HFNC was first-line treatment of de novo ARF in 51 subjects; of these, 45 subjects met ARDS criteria. HFNC was used at all stages of ARF management from pre-oxygenation to postextubation, including palliative ventilatory support.

Fig. 3.
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Fig. 3.

Eighty-seven subjects had high-flow nasal cannula (HFNC) therapy at least once during ICU stay. Detailed indications are shown. ARF = acute respiratory failure, NIV = noninvasive ventilation.

Characteristics of ARDS Subjects

Forty-five subjects met ARDS criteria, with 33% considered as severe ARDS (PaO2/FIO2 < 100 mm Hg), 38% as moderate (PaO2/FIO2 of 100–200 mm Hg), and 29% as mild (PaO2/FIO2 of 200–300 mm Hg) (Table 1). Median breathing frequency was 34 (30–40) breaths/min, with a radiological extent of 3 (2–4) quadrants. The SAPS II score was 36 (24–44). Median PaO2/FIO2 was 137 (88.5–208.5), and 44% of subjects had at least one additional organ failure. Etiology of ARDS was mainly acute infectious pneumonia (80%), followed by drug-induced ARDS (11%) and acute lung injury of extrapulmonary origin (9%).

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Table 1.

Demographics, Clinical Features, and Outcomes of Subjects With ARDS Treated via HFNC

Initial Settings

FIO2 was initially set at the highest level (1.0) for 73% of subjects. In all but 2 subjects, FIO2 was set at > 0.5. Initial oxygen flow was 60 L/min.

Outcome of ARDS Subjects

In this group of very severely hypoxemic subjects (worst PaO2/FIO2 of 108.6 [73–137.1] mm Hg), only 18 subjects required secondary intubation (40%) and were thus classified as having failed HFNC. Reasons for intubation included worsening of hypoxemia (13 subjects, 72%), onset of hemodynamic (4 subjects, 22%), or neurologic failure (one subject, 6%). These subjects had a significantly higher SAPS II score (46 [29–61.5] vs 29 [22–37], P = .001), mostly due to dysfunction of one or more organs (76% vs 26%, P = .002), such as hemodynamic (50% vs 7%, P = .001) or neurological (22% vs 0%, P = .01) failure. HFNC tended to be more frequently discontinued before 24 h in these subjects (67% vs 37%, P = .051) since they were intubated. There was a trend toward lower PaO2/FIO2 after initiation of HFNC in subjects who ultimately required intubation compared with those who did not (115.3 [84–177.1] vs 145.3 [97.5–223.5], P = .26) and a significant difference in the lowest 12-h PaO2/FIO2 (91.5 [64–129.5] vs 124 [93–217], P = .02). Eighteen subjects who required tracheal intubation were pre-oxygenated with HFNC. Factors associated with intubation requirement in ARDS are detailed in Table 2. Univariate analysis identified SAPS II, hemodynamic failure, and the lowest 12-h PaO2/FIO2 to be associated with intubation. In the multivariate analysis, only the SAPS II score was significantly associated with intubation requirement.

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Table 2.

Univariate and Multivariate Analyses of Variables Associated With Intubation Need

Discussion

This observational study aimed to describe ARDS management with HFNC, thus constituting to date the largest series of consecutive subjects with ARDS treated via HFNC with complete follow-up. Furthermore, it captures real-life daily use of HFNC in a general medicosurgical ICU. We can summarize our results as follows: (1) HFNC was used in 45 subjects with ARDS, of whom only 40% required secondary intubation; (2) a large variety of causes of ARF requiring ICU admission were treated by HFNC, but pneumonia accounted for 82% of our HFNC use; and (3) the presence of additional organ failure, mainly hemodynamic or neurological, was associated with a higher HFNC failure rate. Given the increasing use of HFNC in adult patients,7,8 our results have direct clinical applications.

The precise use of HFNC in daily practice, outside research protocols, remains unknown. Case reports and studies with a small number of subjects have been published, but no longitudinal data on consecutive patients are available. We were surprised to find that almost one third of our subjects that required any respiratory support of ≥ 6 L/min oxygen received HFNC. Importantly, HFNC was used at all other stages of respiratory support, from pre-oxygenation for intubation to postextubation and palliative oxygen therapy.

To date, ICU management of respiratory failure is the indication that has received the greatest attention.10–12,15,18 Here, we were interested in assessing HFNC use in subjects with ARDS in a fashion similar to that used by Antonelli et al2 to investigate NIV use in these subjects. We did not select a priori breathing frequency as an ARDS criterion. However, most of our subjects (80%) had a breathing frequency of ≥ 30 breaths/min, which was the threshold chosen by Antonelli et al2 to initiate NIV in their study. PaO2/FIO2 was in the same range of severity, between 115 and 140 mm Hg. Interestingly, our 40% intubation rate is very similar although slightly lower than their rate of 46%, which may be attributed to a greater proportion of subjects with septic shock in their study. This is consistent with the results of Rello et al,18 who reported a 55% rate in a small cohort of subjects with H1N1. They found that subjects with HFNC who were on vasopressors all required tracheal intubation within the first 24 h after ICU admission. In our study, the presence of at least another organ failure and, more specifically, hemodynamic dysfunction was associated in the univariate analysis with HFNC failure. It failed to reach statistical significance in the multivariate analysis, possibly due to a lack of power. This is a clear message for those wishing to develop use of HFNC in their ICU for very hypoxemic patients such as ARDS: the presence of an additional organ failure in a patient with respiratory distress should guide the choice toward another form of ventilatory support, namely invasive mechanical ventilation. These patients may still, however, benefit from HFNC as a means to ensure pre-oxygenation. An advantage of HFNC during intubation compared with noninvasive or conventional bag-valve-mask ventilation is to ensure apneic oxygenation,22,23 which may be a key issue given the limits of pre-oxygenation in ICU patients. This is the reason why we believe it not illogical to start HFNC even in those requiring prompt intubation to ensure adequate oxygenation during laryngoscopy.

The design of our study prohibits any conclusion as to whether HFNC avoided intubation in some subjects. One can speculate, however, that given the high SAPS II score, the severity of ARF, and the extreme degree of hypoxemia (PaO2/FIO2 < 150), a larger proportion of subjects would have been intubated in the absence of HFNC. Obviously, only a randomized controlled trial can definitely settle the question. In any case, our results do provide insight into the characteristics of patients who fail HFNC. Our mortality rates for those subjects who did not require intubation (6% and 4%) and those who did (50% and 47%) are very similar to the rates obtained by Antonelli et al.2

Strength and Limits

Our aim was to offer clinicians not yet using HFNC an idea of how this device can be used, in particular in the setting of de novo ARF and ARDS. We believe that we were able to capture the reality of HFNC use for 1 y in a general ICU. Obviously, the monocentric nature of the study limits the generalization of our findings. However, this is balanced by the fact that all consecutive subjects over 1 y were studied, thus excluding patient selection. Our database (CUB-Réa) is part of a larger network used by many ICUs in Paris and its suburbs, and several articles24,25 have already been published with the data extracted from this database, so as to prove its efficacy and reliability. Our almost identical figures for intubation requirement and mortality in both populations (HFNC failure and success) as those of Antonelli et al2 gives credit to the external validity of our data. The Berlin Definition of ARDS21 requires a minimum PEEP level of 5 cm H2O. HFNC is known to provide a significant level of positive airway pressure in comparison with a standard mask when gas flow is set as low as 35 L/min.26,27 This pressure may reach 7.4 (5.4–8.8) cm H2O with a 60 L/min gas flow and mouth closed.28 During the respiratory cycle, the greatest values were measured at peak expiratory pressure.29 Because all our subjects were managed with a 60 L/min flow upon initiation of HFNC, one may legitimately consider that they all received positive pressure in the vicinity of 5 cm H2O.

Conclusions

Our study shows that HFNC can be used at all stages of ARF management, including patients with severe ARDS. In such subjects, not only did the intubation rate compare with other techniques such as NIV, but even in those who did require intubation, HFNC was used to provide oxygenation for intubation. Owing to its efficacy and its remarkable tolerance, this device is gaining popularity in a number of situations. Further studies are warranted to quantify the number of intubations avoided with this technique.

Footnotes

  • Correspondence: Jean-Damien Ricard MD PhD, Service de Réanimation Médico-Chirurgicale, Hôpital Louis Mourier, 92700 Colombes, France. E-mail: jean-damien.ricard{at}lmr.aphp.fr.
  • Dr Ricard has disclosed a relationship with Fisher & Paykel. The other authors have disclosed no conflicts of interest.

  • See the Related Editorial on Page 307

  • Copyright © 2015 by Daedalus Enterprises

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Respiratory Care: 60 (2)
Respiratory Care
Vol. 60, Issue 2
1 Feb 2015
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Use of High-Flow Nasal Cannula Oxygen Therapy in Subjects With ARDS: A 1-Year Observational Study
Jonathan Messika, Karim Ben Ahmed, Stéphane Gaudry, Romain Miguel-Montanes, Cédric Rafat, Benjamin Sztrymf, Didier Dreyfuss, Jean-Damien Ricard
Respiratory Care Feb 2015, 60 (2) 162-169; DOI: 10.4187/respcare.03423

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Use of High-Flow Nasal Cannula Oxygen Therapy in Subjects With ARDS: A 1-Year Observational Study
Jonathan Messika, Karim Ben Ahmed, Stéphane Gaudry, Romain Miguel-Montanes, Cédric Rafat, Benjamin Sztrymf, Didier Dreyfuss, Jean-Damien Ricard
Respiratory Care Feb 2015, 60 (2) 162-169; DOI: 10.4187/respcare.03423
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