scholarly journals Utility of SpO2/FiO2 ratio for acute hypoxemic respiratory failure with bilateral opacities in the ICU

PLoS ONE ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. e0245927
Author(s):  
Yosuke Fukuda ◽  
Akihiko Tanaka ◽  
Tetsuya Homma ◽  
Keisuke Kaneko ◽  
Tomoki Uno ◽  
...  
Keyword(s):  
Mechanical Ventilation ◽  
Respiratory Failure ◽  
Hospital Mortality ◽  
Prognostic Markers ◽  
Apache Ii ◽  
Icu Mortality ◽  
Hypoxemic Respiratory Failure ◽  
Acute Hypoxemic Respiratory Failure ◽  
Risk Of Death ◽  
Saps Ii

Acute hypoxemic respiratory failure (AHRF) with bilateral opacities causes fatalities in the intensive care unit (ICU). It is often difficult to identify the causes of AHRF at the time of admission. The SpO2 to FiO2 (S/F) ratio has been recently used as a non-invasive and alternative marker of the PaO2/FiO2 (P/F) ratio in acute respiratory failure. This retrospective cohort study was conducted from October 2010 to March 2019 at the Showa University Hospital, Tokyo, Japan. We enrolled 94 AHRF patients who had bilateral opacities and received mechanical ventilation in ICU to investigate their prognostic markers including S/F ratio. Significant differences were observed for APACHE II, S/F ratio, PaO2/FiO2 (P/F) ratio, and ventilator−free-days at day 28 for ICU mortality, and for age, S/F ratio, P/F ratio, duration of mechanical ventilation, and ventilator−free days at day 28 for hospital mortality. Multivariate logistic regression analysis showed that the S/F ratio was significantly and independently associated with the risk of death during in ICU (p = 0.003) and hospitalization (p = 0.002). The area under the receiver operating characteristic curves (AUC) based on the S/F ratio were significantly greater than those based on simplified acute physiology score (SAPS) II and sequential organ failure assessment (SOFA) for ICU mortality (0.785 in S/F ratio vs. 0.575 in SAPS II, p = 0.012; 0.785 in S/F ratio vs 0.594 in SOFA, p = 0.021) and for hospital mortality (0.701 in S/F ratio vs. 0.502 in SAPS II, p = 0.012; 0.701 in S/F ratio vs. 0.503 in SOFA, p = 0.005). In the subanalysis for bacterial pneumonia and interstitial lung disease groups, the AUC based on the S/F ratio was the greatest among all prognostic markers, including APACHE II, SAPS II, and SOFA. The S/F ratio may be a useful and noninvasive predictive prognostic marker for acute hypoxemic respiratory failure with bilateral opacities in the ICU.

scholarly journals Identification of persistent and resolving subphenotypes of acute hypoxemic respiratory failure in two independent cohorts

Critical Care ◽  
2021 ◽  
Vol 25 (1) ◽  
Author(s):  
Neha A. Sathe ◽  
Leila R. Zelnick ◽  
Carmen Mikacenic ◽  
Eric D. Morrell ◽  
Pavan K. Bhatraju ◽  
...  
Keyword(s):  
Mechanical Ventilation ◽  
Respiratory Failure ◽  
Linear Models ◽  
Invasive Mechanical Ventilation ◽  
Respiratory Illness ◽  
High Morbidity ◽  
Hypoxemic Respiratory Failure ◽  
Acute Hypoxemic Respiratory Failure ◽  
Risk Of Death ◽  
Therapeutic Trials

Abstract Background Acute hypoxemic respiratory failure (HRF) is associated with high morbidity and mortality, but its heterogeneity challenges the identification of effective therapies. Defining subphenotypes with distinct prognoses or biologic features can improve therapeutic trials, but prior work has focused on ARDS, which excludes many acute HRF patients. We aimed to characterize persistent and resolving subphenotypes in the broader HRF population. Methods In this secondary analysis of 2 independent prospective ICU cohorts, we included adults with acute HRF, defined by invasive mechanical ventilation and PaO2-to-FIO2 ratio ≤ 300 on cohort enrollment (n = 768 in the discovery cohort and n = 1715 in the validation cohort). We classified patients as persistent HRF if still requiring mechanical ventilation with PaO2-to-FIO2 ratio ≤ 300 on day 3 following ICU admission, or resolving HRF if otherwise. We estimated relative risk of 28-day hospital mortality associated with persistent HRF, compared to resolving HRF, using generalized linear models. We also estimated fold difference in circulating biomarkers of inflammation and endothelial activation on cohort enrollment among persistent HRF compared to resolving HRF. Finally, we stratified our analyses by ARDS to understand whether this was driving differences between persistent and resolving HRF. Results Over 50% developed persistent HRF in both the discovery (n = 386) and validation (n = 1032) cohorts. Persistent HRF was associated with higher risk of death relative to resolving HRF in both the discovery (1.68-fold, 95% CI 1.11, 2.54) and validation cohorts (1.93-fold, 95% CI 1.50, 2.47), after adjustment for age, sex, chronic respiratory illness, and acute illness severity on enrollment (APACHE-III in discovery, APACHE-II in validation). Patients with persistent HRF displayed higher biomarkers of inflammation (interleukin-6, interleukin-8) and endothelial dysfunction (angiopoietin-2) than resolving HRF after adjustment. Only half of persistent HRF patients had ARDS, yet exhibited higher mortality and biomarkers than resolving HRF regardless of whether they qualified for ARDS. Conclusion Patients with persistent HRF are common and have higher mortality and elevated circulating markers of lung injury compared to resolving HRF, and yet only a subset are captured by ARDS definitions. Persistent HRF may represent a clinically important, inclusive target for future therapeutic trials in HRF.

Outcome of Acute Hypoxaemic Respiratory Failure. Insights from the Lung Safe Study

2020 ◽  
pp. 2003317
Author(s):  
Tài Pham ◽  
Antonio Pesenti ◽  
Giacomo Bellani ◽  
Gordon Rubenfeld ◽  
Eddy Fan ◽  
...  
Keyword(s):  
Mechanical Ventilation ◽  
Respiratory Failure ◽  
Hospital Mortality ◽  
Distress Syndrome ◽  
Pulmonary Involvement ◽  
Positive End Expiratory Pressure ◽  
Factors Associated ◽  
Risk Of Death ◽  
Increased Risk ◽  
Current Incidence

BackgroundThe current incidence and outcome of patients with acute hypoxaemic respiratory failure requiring mechanical ventilation in intensive care unit are unknown, especially for patients not meeting criteria for acute respiratory distress syndrome (ARDS).MethodsAn international, multicentre, prospective cohort study of patients presenting with hypoxemia early in the course of mechanical ventilation, conducted during four consecutive weeks in the winter of 2014 in 459 ICUs from 50 countries (LUNG SAFE). Patients were enrolled with PaO2/FiO2 ≤300 mmHg, new pulmonary infiltrates and need for mechanical ventilation with a positive end-expiratory pressure (PEEP) of at least 5 cm H2O. ICU prevalence, causes of hypoxemia, hospital survival, factors associated with hospital mortality were measured. Patients with unilateral versus bilateral opacities were compared.Findings12 906 critically ill patients received mechanical ventilation and 34.9% with hypoxaemia and new infiltrates were enrolled, separated into ARDS (69.0%), unilateral infiltrate (22.7%) and congestive heart failure (8.2%, CHF). The global hospital mortality was 38.6%. CHF patients had a mortality comparable to ARDS (44.1%versus 40.4%). Patients with unilateral-infiltrate had lower unadjusted mortality but similar adjusted mortality than ARDS. The number of quadrants on chest imaging was associated with an increased risk of death. There was no difference in mortality comparing patients with unilateral-infiltrate and ARDS with only 2 quadrants involved.InterpretationMore than one third of the patients receiving mechanical ventilation have hypoxaemia and new infiltrates with an hospital mortality of 38.6%. Survival is dependent on the degree of pulmonary involvement whether or not ARDS criteria are reached.

scholarly journals Non-Invasive Oxygenation Strategies in Adult Patients with Acute Respiratory Failure: A Protocol for a Systematic Review and Network Meta-analysis

2020 ◽  
Author(s):  
Bruno Leonel Ferreyro ◽  
Federico Angriman ◽  
Laveena Munshi ◽  
Lorenzo del Sorbo ◽  
Niall D Ferguson ◽  
...  
Keyword(s):  
Mechanical Ventilation ◽  
Respiratory Failure ◽  
Acute Respiratory Failure ◽  
Meta Analysis ◽  
Invasive Mechanical Ventilation ◽  
Risk Of Bias ◽  
Adult Patients ◽  
Hypoxemic Respiratory Failure ◽  
Acute Hypoxemic Respiratory Failure ◽  
Non Invasive

Abstract Background: Acute hypoxemic respiratory failure is one of the leading causes of intensive care unit admission and associated with high mortality. Non-invasive oxygenation strategies such as high flow nasal cannula, standard oxygen therapy and non-invasive ventilation (delivered by either face mask or helmet interface) are widely available interventions applied in these patients. It remains unclear which of these interventions are more effective in decreasing rates of invasive mechanical ventilation and mortality. The primary objective of this network meta-analysis is to summarize the evidence and compare the effect of non-invasive oxygenation strategies on mortality and need for invasive mechanical ventilation in patients with acute hypoxemic respiratory failure. Methods: We will search key databases for randomized controlled trials assessing the effect of non-invasive oxygenation strategies in adult patients with acute hypoxemic respiratory failure. We will exclude studies in which the primary focus is either acute exacerbations of chronic obstructive pulmonary disease or cardiogenic pulmonary edema. The primary outcome will be all-cause mortality (longest available up to 90 days). The secondary outcomes will be receipt of invasive mechanical ventilation (longest available up to 30 days). We will assess the risk of bias for each of the outcomes using the Cochrane Risk of Bias Tool. Bayesian network meta-analyses will be conducted to obtain pooled estimates of head-to-head comparisons. We will report pairwise and network meta-analysis treatment effect estimates as risk ratios and 95% credible intervals. Subgroup analyses will be conducted examining key populations including immunocompromised hosts. Sensitivity analyses will be conducted by excluding those studies with high risk of bias and different etiologies of acute respiratory failure. We will assess certainty in effect estimates using GRADE methodology. Discussion : This study will help to guide clinical decision making when caring for adult patients with AHRF and improve our understanding of the limitations of the available literature assessing noninvasive oxygenation strategies in acute hypoxemic respiratory failure.

Weaning from mechanical ventilation: patterns in young children recovering from acute hypoxemic respiratory failure

1998 ◽  
Vol 7 (5) ◽  
pp. 335-345 ◽  
Author(s):  
MA Curley ◽  
JC Fackler
Keyword(s):  
Mechanical Ventilation ◽  
Acute Respiratory Distress Syndrome ◽  
Respiratory Failure ◽  
Young Children ◽  
Respiratory Distress Syndrome ◽  
Respiratory Distress ◽  
Distress Syndrome ◽  
Weaning From Mechanical Ventilation ◽  
Hypoxemic Respiratory Failure ◽  
Acute Hypoxemic Respiratory Failure

OBJECTIVE: The purpose of the study was to describe the patterns of weaning from mechanical ventilation in young children recovering from acute hypoxemic respiratory failure. METHODS: Decision-making rules on progressive weaning were developed and applied to existing data on 82 patients 2 weeks to 6 years old in the Pediatric Acute Respiratory Distress Syndrome Data Set. RESULTS: Three patterns of weaning progress were detected: sprint, consistent, and inconsistent. Length of ventilation and weaning progressively increased from the sprint, to the consistent, to the inconsistent subset. Patients in the inconsistent subset were most likely to have a systemic (sepsis or shock) trigger of acute respiratory distress syndrome and to be rated as having at least moderate disability at discharge. Hypothesis-generating univariate and then multivariate logistic regression analyses indicated that patients who experienced more days of mechanical ventilation before the start of weaning and who had a higher oxygenation index during the weaning process were most likely to have an inconsistent pattern of weaning. CONCLUSION: Patterns of weaning are discernible in a population of young children and indicate a subset at risk for inconsistent weaning. Knowing the patterns of weaning may help clinicians anticipate, perhaps plot, and then modulate a patient's weaning trajectory.

Persistent hypoxemic respiratory failure is associated with increased mortality, with or without the acute respiratory distress syndrome: a cohort study

2020 ◽  
Author(s):  
Neha Alhad Sathe ◽  
Leila R. Zelnick ◽  
Carmen Mikacenic ◽  
Eric D. Morrell ◽  
Pavan K. Bhatraju ◽  
...  
Keyword(s):  
Acute Respiratory Distress Syndrome ◽  
Respiratory Failure ◽  
Respiratory Distress Syndrome ◽  
Respiratory Distress ◽  
Distress Syndrome ◽  
Chronic Respiratory Disease ◽  
Hypoxemic Respiratory Failure ◽  
Acute Hypoxemic Respiratory Failure ◽  
Plasma Biomarkers ◽  
Risk Of Death

Abstract Background Identifying effective therapies in heterogeneous conditions like acute hypoxemic respiratory failure (AHRF) depends on defining sub-phenotypes with distinct prognosis or therapeutic response. Prior efforts have focused on acute respiratory distress syndrome (ARDS), although ARDS is a minority of all AHRF patients, has limited reliability in research, and is similarly heterogeneous. We propose a novel AHRF sub-phenotype called persistent hypoxemic respiratory failure (PHRF), defined by PaO2:FiO2 ratio ≤ 300 in individuals still requiring mechanical ventilation on day 3 following intubation. We hypothesized individuals with PHRF (+ PHRF) have greater mortality than individuals without PHRF (-PHRF), irrespective of ARDS (+/-ARDS). Methods We included mechanically ventilated AHRF patients (n = 768) from a single-center prospective cohort of medical and surgical ICU patients. We estimated the relative risk of 28-day inpatient mortality associated with + PHRF compared to -PHRF using generalized linear models. We also compared mortality and baseline log-transformed plasma biomarkers of inflammation and endothelial activation/dysfunction in + PHRF/-ARDS, -PHRF/+ARDS, and + PHRF/+ARDS compared to -PHRF/-ARDS. Results Cumulative incidence of + PHRF was 53% (n = 408), of whom 51% were + ARDS by ICU day 3 (n = 209). +PHRF was associated with a 1.55-fold higher risk of death (95% CI: 1.02, 2.34) compared to -PHRF, adjusting for demographics, chronic respiratory disease, and APACHE-III. Absolute mortality was higher in + PHRF/+ARDS (23%) and + PHRF/+ARDS (15%) patients than -PHRF/+ARDS (12%) and -PHRF/-ARDS (7%) patients. Interleukin-6 was 2.36-fold (95% CI: 1.47, 3.80) and 2.62-fold (1.63, 4.20) higher in + PHRF/-ARDS and + PHRF/+ARDS compared to -PHRF/-ARDS; granulocyte-colony stimulating factor was 1.96-fold (95% CI: 1.28, 3.01) and 1.82-fold (95% CI: 1.16, 2.85) higher; angiopoeitin-2 was 1.32-fold (95% CI: 1.01, 1.73) and 1.59-fold (95% CI: 1.21, 2.09) higher. In contrast, -PHRF/+ARDS patients did not have significantly different mortality or plasma biomarkers from -PHRF/-ARDS patients in adjusted models. Conclusions PHRF represents a common sub-phenotype of patients with AHRF, characterized by higher mortality and higher biomarkers of inflammation and endothelial dysfunction than -PHRF. PHRF captures many high-risk patients not included in current ARDS definition who may share biologic features with ARDS. Identifying patients with PHRF can support clinical prognostication and targeted trial enrollment for investigational therapies in the broad AHRF population.

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