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Background Geoeconomic variations in epidemiology, the practice of ventilation, and outcome in invasively ventilated intensive care unit (ICU) patients without acute respiratory distress syndrome (ARDS) remain unexplored. In this analysis we aim to address these gaps using individual patient data of four large observational studies. MethodsIn this pooled analysis we harmonised individual patient data from the ERICC, LUNG SAFE, PRoVENT, and PRoVENT-iMiC prospective observational studies, which were conducted from June, 2011, to December, 2018, in 534 ICUs in 54 countries. We used the 2016 World Bank classification to define two geoeconomic regions: middleincome countries (MICs) and high-income countries (HICs). ARDS was defined according to the Berlin criteria. Descriptive statistics were used to compare patients in MICs versus HICs. The primary outcome was the use of low tidal volume ventilation (LTVV) for the first 3 days of mechanical ventilation. Secondary outcomes were key ventilation parameters (tidal volume size, positive end-expiratory pressure, fraction of inspired oxygen, peak pressure, plateau pressure, driving pressure, and respiratory rate), patient characteristics, the risk for and actual development of acute respiratory distress syndrome after the first day of ventilation, duration of ventilation, ICU length of stay, and ICU mortality. Findings Of the 7608 patients included in the original studies, this analysis included 3852 patients without ARDS, of whom 2345 were from MICs and 1507 were from HICs. Patients in MICs were younger, shorter and with a slightly lower body-mass index, more often had diabetes and active cancer, but less often chronic obstructive pulmonary disease and heart failure than patients from HICs. Sequential organ failure assessment scores were similar in MICs and HICs. Use of LTVV in MICs and HICs was comparable (42•4% vs 44•2%; absolute difference -1•69 [-9•58 to 6•11] p=0•67; data available in 3174 [82%] of 3852 patients). The median applied positive end expiratory pressure was lower in MICs than in HICs (5 [IQR 5-8] vs 6 [5-8] cm H 2 O; p=0•0011). ICU mortality was higher in MICs than in HICs (30•5% vs 19•9%; p=0•0004; adjusted effect 16•41% [95% CI 9•52-23•52]; p<0•0001) and was inversely associated with gross domestic product (adjusted odds ratio for a US$10 000 increase per capita 0•80 [95% CI 0•75-0•86]; p<0•0001).Interpretation Despite similar disease severity and ventilation management, ICU mortality in patients without ARDS is higher in MICs than in HICs, with a strong association with country-level economic status.

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Introduction: Despite widespread use of noninvasive ventilation (NIV) in some COVID-19 hypoxemic patients, its clinical application is still subject of debate. Methods: This is a retrospective, observational study with data collected from 91consecutive patients treated in COVID ICU in our institution between October 2020 and February 2021. Outcomes were represented as ventilation hours, ICU and hospital length of stay and ICU and hospital mortality. Results: Patients’ mean age was 66 ±11 years and severe COVID-19 pneumonia with mean paO2/FiO2 137±57 was observed in 90 % of the patients. High PEEP NIV via total face mask was initially applied in 58 (64%) patients, high flow oxygen therapy (HFOT) in 25 (27%) patients, whilst invasive mechanical ventilation (IMV) started at the moment of admission in 8 (9%) patients. NIV and HFOT have been kept on throughout ICU stay in 50 (55 %) patients, while 41 (45 %) patients were put on IMV. Overall ICU mortality was 41%, while ICU mortality of patients on NIV was 14%. Conclusion: High PEEP NIV was convenient and safe as initial respiratory support and in some COVID-19 ARDS patients remained an optimal respiratory support throughout their disease.