Background Little information is available about the geo-economic variations in demographics, management, and outcomes of patients with acute respiratory distress syndrome (ARDS). We aimed to characterise the effect of these geo-economic variations in patients enrolled in the Large Observational Study to Understand the Global Impact of Severe Acute Respiratory Failure (LUNG SAFE). Methods LUNG SAFE was done during 4 consecutive weeks in winter, 2014, in a convenience sample of 459 intensivecare units in 50 countries across six continents. Inclusion criteria were admission to a participating intensive-care unit (including transfers) within the enrolment window and receipt of invasive or non-invasive ventilation. One of the trial's secondary aims was to characterise variations in the demographics, management, and outcome of patients with ARDS. We used the 2016 World Bank countries classification to define three major geo-economic groupings, namely European high-income countries (Europe-High), high-income countries in the rest of the world (rWORLD-High), and middle-income countries (Middle). We compared patient outcomes across these three groupings. LUNG SAFE is registered with ClinicalTrials.gov, number NCT02010073. Findings Of the 2813 patients enrolled in LUNG SAFE who fulfilled ARDS criteria on day 1 or 2, 1521 (54%) were recruited from Europe-High, 746 (27%) from rWORLD-High, and 546 (19%) from Middle countries. We noted significant geographical variations in demographics, risk factors for ARDS, and comorbid diseases. The proportion of patients with severe ARDS or with ratios of the partial pressure of arterial oxygen (PaO 2) to the fractional concentration of oxygen in inspired air (F I O 2) less than 150 was significantly lower in rWORLD-High countries than in the two other regions. Use of prone positioning and neuromuscular blockade was significantly more common in Europe-High countries than in the other two regions. Adjusted duration of invasive mechanical ventilation and length of stay in the intensive-care unit were significantly shorter in patients in rWORLD-High countries than in Europe-High or Middle countries. High gross national income per person was associated with increased survival in ARDS; hospital survival was significantly lower in Middle countries than in Europe-High or rWORLD-High countries. Interpretation Important geo-economic differences exist in the severity, clinician recognition, and management of ARDS, and in patients' outcomes. Income per person and outcomes in ARDS are independently associated.

Table of contentsP001 - Sepsis impairs the capillary response within hypoxic capillaries and decreases erythrocyte oxygen-dependent ATP effluxR. M. Bateman, M. D. Sharpe, J. E. Jagger, C. G. EllisP002 - Lower serum immunoglobulin G2 level does not predispose to severe flu.J. Solé-Violán, M. López-Rodríguez, E. Herrera-Ramos, J. Ruíz-Hernández, L. Borderías, J. Horcajada, N. González-Quevedo, O. Rajas, M. Briones, F. Rodríguez de Castro, C. Rodríguez GallegoP003 - Brain protective effects of intravenous immunoglobulin through inhibition of complement activation and apoptosis in a rat model of sepsisF. Esen, G. Orhun, P. Ergin Ozcan, E. Senturk, C. Ugur Yilmaz, N. Orhan, N. Arican, M. Kaya, M. Kucukerden, M. Giris, U. Akcan, S. Bilgic Gazioglu, E. TuzunP004 - Adenosine a1 receptor dysfunction is associated with leukopenia: A possible mechanism for sepsis-induced leukopeniaR. Riff, O. Naamani, A. DouvdevaniP005 - Analysis of neutrophil by hyper spectral imaging - A preliminary reportR. Takegawa, H. Yoshida, T. Hirose, N. Yamamoto, H. Hagiya, M. Ojima, Y. Akeda, O. Tasaki, K. Tomono, T. ShimazuP006 - Chemiluminescent intensity assessed by eaa predicts the incidence of postoperative infectious complications following gastrointestinal surgeryS. Ono, T. Kubo, S. Suda, T. Ueno, T. IkedaP007 - Serial change of c1 inhibitor in patients with sepsis – A prospective observational studyT. Hirose, H. Ogura, H. Takahashi, M. Ojima, J. Kang, Y. Nakamura, T. Kojima, T. ShimazuP008 - Comparison of bacteremia and sepsis on sepsis related biomarkersT. Ikeda, S. Suda, Y. Izutani, T. Ueno, S. OnoP009 - The changes of procalcitonin levels in critical patients with abdominal septic shock during blood purificationT. Taniguchi, M. OP010 - Validation of a new sensitive point of care device for rapid measurement of procalcitoninC. Dinter, J. Lotz, B. Eilers, C. Wissmann, R. LottP011 - Infection biomarkers in primary care patients with acute respiratory tract infections – Comparison of procalcitonin and C-reactive proteinM. M. Meili, P. S. SchuetzP012 - Do we need a lower procalcitonin cut off?H. Hawa, M. Sharshir, M. Aburageila, N. SalahuddinP013 - The predictive role of C-reactive protein and procalcitonin biomarkers in central nervous system infections with extensively drug resistant bacteriaV. Chantziara, S. Georgiou, A. Tsimogianni, P. Alexandropoulos, A. Vassi, F. Lagiou, M. Valta, G. Micha, E. Chinou, G. MichaloudisP014 - Changes in endotoxin activity assay and procalcitonin levels after direct hemoperfusion with polymyxin-b immobilized fiberA. Kodaira, T. Ikeda, S. Ono, T. Ueno, S. Suda, Y. Izutani, H. ImaizumiP015 - Diagnostic usefullness of combination biomarkers on ICU admissionM. V. De la Torre-Prados, A. Garcia-De la Torre, A. Enguix-Armada, A. Puerto-Morlan, V. Perez-Valero, A. Garcia-AlcantaraP016 - Platelet function analysis utilising the PFA-100 does not predict infection, bacteraemia, sepsis or outcome in critically ill patientsN. Bolton, J. Dudziak, S. Bonney, A. Tridente, P. NeeP017 - Extracellular histone H3 levels are in...

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In spite of advances in microbiological and serological investigations over the last two decades, etiological attribution remains difficult in community-acquired pneumonia (CAP). Even after exhaustive investigation, the etiology of CAP remains unknown in up to 50% of patients. Common pathogens include Streptococcus pneumoniae, Haemophilus influenzae and Moraxella catarrhalis. In addition, several investigators document the importance of atypical pathogens including Mycoplasma pneumoniae, Chlamydophila pneumoniae and Legionella pneumophila in the etiology of CAP in the GCC region. Increasingly, other etiologies, particularly influenza viruses, varicella zoster virus and Mycobacterium tuberculosis, have been recognized as causative pathogens of CAP within the region. Rates of antimicrobial resistance of S. pneumoniae and other pathogens are rising in the Gulf Corporation Council (GCC) region and susceptibility profiles of antibiotics against intracellular pathogens such as Chlamydophila pneumoniae and Mycoplasma pneumoniae are not routinely performed. Injudicious prescribing and over-use of antibiotics drive much resistance. The GCC CAPWG calls for urgent governmental regulations to limit and monitor antibiotic prescription in the GCC region.

Risk factors identify likelihood and severity of community-acquired pneumonia (CAP) and may allow prognostication. Prognostic factors can focus resources and efforts on those who may need special observation. Several risk assessment tools are used to estimate the severity of CAP and whether these tools can be used to predict outcomes, to determine disposition or even used to determine ICU level of care is hotly under debate. Treating CAP depends on age and comorbidities, as well as local epidemiology and disease severity. The current guidelines for managing CAP categorize patients with CAP into the healthy outpatient, the outpatient with modifying factors or comorbidities, the inpatient with CAP and patients requiring intensive care unit admission. These guidelines took into account regional bacteriology, antibiotic resistance data and available antibiotics to formulate recommendations. Preventive strategies for CAP include the administration of pneumococcal and influenza vaccine in selected populations at risk.

This article is one of ten reviews selected

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World-wide community-acquired pneumonia (CAP) is a common respiratory tract infection and is now a growing public health concern in the GCC region. Practice guidelines are derived statements which lead to informed clinical decision making. National and regional guidelines have been developed in North America, South America, South Africa and Western Europe to assist practitioners managing patients with CAP and have demonstrated to improve patients outcome. Four years have elapsed since the publication of the Saudi Arabian CAP guideline and notable changes in the area of CAP demand revision of this earlier document. We expanded previous guidelines to a regional level in a number of ways: by incorporating changes in antimicrobial resistance profiles in the region, by considering the regional availability of antibiotics and diagnostic procedures, by including emerging data on new advancements in diagnosis and treatment of CAP and, finally, by adopting an evidence-based approach in grading relevant data. The current document seeks to target primary care physicians who manage most patients with CAP in the GCC region. All available and relevant peer reviewed studies published until June 2007 were considered in the literature review. Based on the strength of the evidence, we graded our recommendations to high-level (Level I), moderate-level (Level II), and low-level (Level III) evidence.