Successful treatment of sepsis has been more than vexing, and the reason for this, according to Prof. Seymour, is the existence of 4 different phenotypes. The 4 novel sepsis phenotypes -alpha (α), beta (β), gamma (γ), and delta (δ)- have different demographics, laboratory values, and patterns of organ dysfunction. Furthermore, they correlate with specific biomarkers and mortality. Their analysis also identified a subtype of patients at high risk of liver dysfunction and shock, who had the highest in-hospital death rates.
Prof. Seymour and colleagues examined 29 specific variables recorded in the electronic health record system of >20,000 patients identified with sepsis at 12 Pennsylvania hospitals from 2010 to 2012 (derivation cohort). Reproducibility of the findings was measured in a second dataset involving 43,000 patient arrivals at the Pennsylvania hospitals from 2013 to 2014 (validation cohort). Both cohorts were comparable with regard to mean age, gender distribution, and mean maximum 24-hour Sequential Organ Failure Assessment score.
The 4 sepsis subtypes are distinct in the following features:
- alpha (α): identified in ±33% patients; characterised by having the fewest abnormal laboratory test results, the least organ dysfunction, and the lowest in-hospital death rate (23%);
- beta (β): identified in 27% of patients; defining characteristics including older age, more chronic illness, and kidney dysfunction;
- gamma (γ): identified in ±25% patients; distinguished from β by association with elevated inflammation and primary pulmonary dysfunction; and
- delta (δ): identified in 13% of patients is the least common and most deadly phenotype; characterised by liver dysfunction and shock, and the highest in-hospital mortality (32%).
Consistent differences by phenotype were seen. In the derivation cohort, cumulative 28-day mortality was 5% in the α phenotype, 13% in the β phenotype, 24% in the γ phenotype, and 40% in the δ phenotype. Across all cohorts and trials, 28-day and 365-day mortality were highest among the δ phenotype vs the other 3 phenotypes (P<0.001). Prof. Seymour concluded that a key goal is delivering targeted treatments to patients with sepsis in the way that treatment is now delivered for many cancers.
- De Merle K, et al. A7470, ATS 2019, 17-22 May, Dallas, USA.
- Seymour CW, et al. JAMA. 2019;321(20):2003-2017.
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Table of Contents: ATS 2019
Featured articles
Letter from the Editor
Interview with Prof. Christian Bergmann
Treatable Traits in Chronic Inflammatory Airway Disease: Back to Basics
Treatable traits in chronic inflammatory airway disease: back to basics
Critical Care Medicine
Distinguishing between 4 different subtypes of sepsis sets the stage for individualised treatment
Stem cell therapy in acute respiratory distress syndrome improves 28-day mortality
SPICE III trial: Early sedation with dexmedetomidine in critically ill patients
SAATELLITE trial: Suvratoxumab prevents ventilator-associated Staphylococcus Aureus pneumonia in intensive care unit patients
Sleep Medicine
Million-patient study reveals gaps in long-term adherence among various sub-populations
Sleep apnoea severity has a non-linear relationship with acute myocardial infarction risk
Obstructive sleep apnoea affects morning spatial navigational memory processing in asymptomatic older individuals
Pulmonary Vascular Disease and Interstitial Lung Disease
Nintedanib reduces lung function decline in systemic sclerosis-associated ILD
Pulmonary arterial hypertension: early treatment with selexipag most effective
Long-term safety and efficacy of recombinant human pentraxin-2 in patients with idiopathic pulmonary fibrosis
Infection
Dupilumab improves outcomes in patients with severe chronic rhinosinusitis with nasal polyps and comorbid asthma
Durability of culture conversion in patients receiving ALIS for treatment-refractory MAC lung disease
E-cigarette use disrupts normal immune response to viral infections, particularly in women
Paediatric Pulmonary Medicine
Bacterial pneumonia predicts ongoing lung problems in infants hospitalised for acute respiratory failure
Aspergillus and early cystic fibrosis lung disease: does it need to be treated?
COPD
CORTICO-COP trial: eosinophil-guided therapy reduces systemic corticosteroid exposure
A randomised controlled trial of a smoking cessation smartphone application
Benralizumab does not ameliorate COPD exacerbations (GALATHEA/TERRANOVA trials)
Aclidinium bromide delays COPD exacerbation without increased MACE risk
Bench-to-Bedside (Pre-Clinical)
Human lung organoids to study foetal RSV infection
CRISPR/Cas9 genome editing therapy of hereditary pulmonary alveolar proteinosis
Cilia diagnostics in primary ciliary dyskinesia
Tuberous sclerosis complex 2 may be a novel target in pulmonary arterial hypertension therapy
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