Daily Sepsis Research Analysis
Three impactful studies advance sepsis-related care and understanding: a PROSPERO-registered meta-analysis shows corticosteroids reduce short-term mortality and invasive ventilation in hospitalized non-viral CAP; a prospective study proposes the RISC score to predict carbapenem-resistant infections in gram-negative hospital-acquired sepsis; and a national cohort links sepsis to dose-dependent long-term dementia risk, especially vascular dementia.
Summary
Three impactful studies advance sepsis-related care and understanding: a PROSPERO-registered meta-analysis shows corticosteroids reduce short-term mortality and invasive ventilation in hospitalized non-viral CAP; a prospective study proposes the RISC score to predict carbapenem-resistant infections in gram-negative hospital-acquired sepsis; and a national cohort links sepsis to dose-dependent long-term dementia risk, especially vascular dementia.
Research Themes
- Adjunctive corticosteroid therapy in severe infection
- Predictive modeling for antimicrobial resistance in sepsis
- Long-term neurocognitive sequelae after sepsis
Selected Articles
1. Corticosteroids for adult patients hospitalised with non-viral community-acquired pneumonia: a systematic review and meta-analysis.
This PROSPERO-registered meta-analysis of 30 RCTs (n=7,519) in hospitalized adults with non-viral CAP found that corticosteroids likely reduce 28–30-day mortality (RR 0.82) and the need for invasive mechanical ventilation (RR 0.63), with possible reductions in ICU and hospital length of stay. Hyperglycemia requiring intervention increased, while secondary infection risk did not.
Impact: Synthesizes high-level evidence resolving inconsistent guidance on steroids in CAP with clinically meaningful mortality and ventilation benefits.
Clinical Implications: Consider adjunctive corticosteroids for hospitalized adults with non-viral CAP to reduce short-term mortality and invasive ventilation, with close glucose monitoring. Avoid extrapolating to viral pneumonias and tailor dosing while monitoring adverse effects.
Key Findings
- Short-term (28–30 days) mortality reduced with corticosteroids (RR 0.82, 95% CI 0.74–0.91; moderate certainty).
- Need for invasive mechanical ventilation reduced (RR 0.63, 95% CI 0.48–0.82; high certainty).
- ICU and hospital stays were modestly shorter (low certainty).
- Hyperglycemia requiring intervention increased (RR 1.32), with no increase in secondary infections (RR 0.97).
Methodological Strengths
- PROSPERO-registered systematic review with GRADE certainty assessment.
- Random-effects, Bayesian, and dose–response meta-analyses across 30 RCTs (n=7,519).
Limitations
- Heterogeneity in corticosteroid agents, doses, and durations across trials.
- Lower certainty for longer-term (60–90 day) mortality and potential residual publication bias.
Future Directions: Head-to-head trials to optimize dosing/duration and patient selection; pragmatic studies integrating glycemic management protocols; subgroup analyses by pathogen and severity.
PURPOSE: International clinical practice guidelines addressing corticosteroid treatment for patients hospitalised with non-viral community-acquired pneumonia (CAP) are inconsistent. METHODS: We conducted a systematic review of randomized controlled trials (RCTs) evaluating the use of corticosteroids in hospitalised adult patients with suspected or probable CAP. We performed random effects pairwise, Bayesian, and dose-response meta-analyses using the restricted maximum likelihood (REML) heterogeneity estimator. We assessed certainty of evidence using GRADE methodology. RESULTS: We identified 30 eligible RCTs, including a total of 7519 patients. The prednisone-equivalent doses ranged between 29 mg/day and 100 mg/day. Corticosteroids probably reduced short-term (28-30 days) mortality (RR 0.82 [95% CI 0.74-0.91]; moderate certainty) while the reduction in longer term (60-90 day) mortality is less certain (RR 0.89 [95% CI 0.76-1.03]; low certainty). Corticosteroids reduced the need for invasive mechanical ventilation (IMV) (RR 0.63 [95% CI 0.48-0.82]; high certainty) and may reduce duration of ICU stay (MD 1.53 days fewer [95% CI 0.31-2.75 days fewer]; low certainty), and hospital stay (MD 2.30 days fewer [95% CI 0.81-3.81 days fewer]; low certainty). Corticosteroids probably increased hyperglycaemia requiring intervention (RR 1.32 [95% CI 1.12-1.56]; moderate certainty) but probably have no effect on secondary infections (RR 0.97 [95% CI 0.85-1.11]; moderate certainty). CONCLUSION: Corticosteroids probably reduced short-term mortality and reduce the need for invasive mechanical ventilation in hospitalised patients with CAP. PROSPERO REGISTRATION NUMBER: CRD42024521536.
2. The Novel "RISC" Score as a Risk-prediction Model of Carbapenem-resistant Hospital-acquired Infections in Adult Sepsis Patients - A Prospective Observational Study.
In a single-center prospective cohort of gram-negative hospital-acquired sepsis (n=195; 74.4% CRI), the authors identified ventilator-associated pneumonia, longer pre-HAI ICU stay, septic shock, and empirical carbapenem use as independent predictors of carbapenem resistance, forming the basis of the RISC score.
Impact: Provides a practical, early risk-prediction tool to anticipate carbapenem resistance before AMS results, supporting antimicrobial stewardship.
Clinical Implications: Use RISC score factors (VAP, pre-HAI ICU length of stay, septic shock, empirical carbapenem) to stratify CRI risk and tailor empiric therapy while minimizing unnecessary broad-spectrum use.
Key Findings
- Among 195 gram-negative HAI sepsis patients, 74.4% had carbapenem-resistant infections.
- Independent predictors of CRI included VAP, longer ICU stay before HAI, septic shock, and empirical carbapenem exposure.
- A novel RISC score was proposed to predict CRI risk prior to antimicrobial susceptibility results.
Methodological Strengths
- Prospective observational design with predefined clinical predictors and multivariable logistic regression.
- Large screened cohort (n=935) with focused inclusion of gram-negative HAI sepsis (n=195).
Limitations
- Single-center study without external validation; model performance metrics are not reported in the abstract.
- Partial abstract limits detail on coefficient weights and calibration; potential center-specific practice patterns.
Future Directions: External validation across diverse ICUs and incorporation of microbiologic/ecological variables; impact analyses on antimicrobial stewardship and patient outcomes.
AIM AND BACKGROUND: Antimicrobial sensitivity (AMS) reports are often available after 72 hours of identification of gram-negative (GN) hospital-acquired infection (HAI). Prediction of carbapenem-resistant infection (CRI) among GN strains is important even before AMS reports are available, for judicious use of empirical antibiotics. We aimed to study the predictors of CRI in patients with HAI. MATERIALS AND METHODS: We conducted a single-center prospective observational study between April 2023 and September 2024 on patients of GN sepsis with HAI. The use of empirical carbapenem antibiotics, organ dysfunction scores, the modified nutritional risk in critically ill (mNUTRIC) score, blood-count-derived inflammation indices, type of HAI, AMS reports, and in-hospital mortality were noted. RESULTS: A total of 935 sepsis patients with HAI were screened, and there were 195 patients with GN infection. Among the 195 patients, 145 (74.4%) had CRI and 50 (25.6%) had non-CRI. Multivariable logistic regression revealed that the length of intensive care unit (ICU) stay before the day of HAI ( CONCLUSION: In GN sepsis patients with HAI, respiratory infection (VAP), length of ICU stay prior to HAI, septic shock, and empirical carbapenem antibiotic administration are risk factors of CRI. HOW TO CITE THIS ARTICLE: Mareguddi AB, Chaudhuri S, Shanmukhappa SM, Parampalli V, Bhatt MT, Fernandes R,
3. Sepsis on dementia risk: A population-based cohort study with dose-dependent analysis.
Using Taiwan’s NHIRD with landmark and propensity methods, sepsis was associated with a 59% higher risk of dementia, with a dose-response relationship for multiple sepsis episodes and the strongest association for vascular dementia.
Impact: Defines long-term neurocognitive risk after sepsis using robust epidemiologic methods, informing surveillance and secondary prevention strategies.
Clinical Implications: Post-sepsis care should include counseling on cognitive risks, targeted screening (especially for vascular cognitive impairment), and aggressive management of vascular risk factors.
Key Findings
- Sepsis increased all-cause dementia risk (HR 1.59; 95% CI 1.47–1.72).
- Dose-response observed: multiple sepsis episodes conferred higher risk (sHR 1.63; 95% CI 1.39–1.91).
- Vascular dementia showed the strongest association (1.2% vs 0.6%; P=0.0003).
Methodological Strengths
- Large population-based dataset with propensity score matching and landmark design ensuring temporality.
- Competing risk modeling (Fine-Gray) to account for death, enhancing validity of dementia estimates.
Limitations
- Observational claims-based data with potential residual confounding and misclassification.
- Lack of granular clinical cognitive assessments and severity phenotyping; generalizability beyond Taiwan requires caution.
Future Directions: Prospective cohorts with detailed neurocognitive testing post-sepsis; interventional trials targeting vascular risk modification to mitigate dementia risk.
PURPOSE: Emerging evidence links sepsis-related inflammation to dementia risk, but the dose-dependent effects of recurrent sepsis episodes remain unclear. This study assessed whether sepsis increases dementia risk and explored a potential dose-response relationship between sepsis frequency and dementia. METHODS: We conducted a retrospective cohort study using Taiwan's National Health Insurance Research Database (2005-2022), enrolling patients aged ≥18 years hospitalized with sepsis. An index period (2008-2013) was used to identify patients without prior dementia. A fixed 12-month landmark period (calendar year 2014) was applied to assess the number of sepsis episodes. Patients who died during the landmark period were excluded. Propensity score matching was performed to generate well-balanced sepsis and non-sepsis groups. Follow-up for dementia and mortality began after the landmark period and continued for up to 64 months. Cox and Fine-Gray models were used to account for competing risks of death. RESULTS: Sepsis was associated with a significantly increased risk of all-cause dementia (HR 1.59; 95 % CI, 1.47-1.72; P < 0.0001). A dose-response relationship was observed: patients with multiple sepsis episodes had the highest dementia risk (sHR 1.63; 95 % CI, 1.39-1.91). Vascular dementia showed the strongest association, with a higher incidence in the sepsis group (1.2 % vs. 0.6 %, P = 0.0003). CONCLUSIONS: Our findings provide robust evidence of a dose-dependent association between sepsis and increased dementia risk, particularly vascular dementia, even after adjusting for competing mortality risks. SUMMARY: This study addresses the limitations of previous research by not only employing propensity score matching (PSM) to balance confounding factors between the sepsis and non-sepsis groups but also using an index period and landmark period design to better explore potential causal relationships. These periods ensure that dementia onset occurred after sepsis and allow for the examination of dose-response relationship between sepsis episode frequency and dementia. Furthermore, this is the largest study to date involving sepsis patients, providing more robust evidence than prior studies, which were often smaller and lacked adjustments for competing risks of death.