Daily Sepsis Research Analysis
Three impactful studies on sepsis span rapid diagnostics, vasopressor strategy, and prevention of procedure-related urosepsis. A prospective ICU study shows deep learning on hyperspectral skin imaging can rapidly diagnose sepsis and predict mortality; a meta-analysis finds adrenaline and noradrenaline yield similar outcomes in septic shock; and a urology systematic review identifies stone and renal pelvis cultures as superior predictors of post-operative urosepsis versus bladder cultures.
Summary
Three impactful studies on sepsis span rapid diagnostics, vasopressor strategy, and prevention of procedure-related urosepsis. A prospective ICU study shows deep learning on hyperspectral skin imaging can rapidly diagnose sepsis and predict mortality; a meta-analysis finds adrenaline and noradrenaline yield similar outcomes in septic shock; and a urology systematic review identifies stone and renal pelvis cultures as superior predictors of post-operative urosepsis versus bladder cultures.
Research Themes
- Rapid noninvasive diagnostics for sepsis using hyperspectral imaging and AI
- Vasopressor choice in septic shock (adrenaline vs noradrenaline)
- Preventing post-procedural urosepsis via targeted intra-operative cultures
Selected Articles
1. AI-powered skin spectral imaging enables instant sepsis diagnosis and outcome prediction in critically ill patients.
Prospective ICU data show that a single hyperspectral skin image analyzed by deep learning can diagnose sepsis (AUROC 0.80) and predict mortality (AUROC 0.72), improving to 0.94 and 0.83 when combined with clinical variables. Acquisition occurs within seconds, indicating potential for point-of-care, noninvasive sepsis triage.
Impact: Demonstrates a rapid, noninvasive diagnostic modality with high accuracy when combined with clinical data, addressing a critical gap in early sepsis detection.
Clinical Implications: HSI plus AI could augment triage and early sepsis recognition, enabling faster initiation of bundled care and risk-adjusted monitoring without blood draws.
Key Findings
- Single HSI cube from palms/fingers predicted sepsis (AUROC 0.80) and mortality (AUROC 0.72).
- Adding routine clinical data improved AUROC to 0.94 for sepsis and 0.83 for mortality.
- Data acquisition is completed within seconds, supporting point-of-care use.
Methodological Strengths
- Prospective observational design in a critically ill cohort with predefined outcomes.
- Objective diagnostic performance reporting (AUROC) and evaluation with/without clinical variables.
Limitations
- Observational single-modality diagnostic study; lacks external multicenter validation and inter-operator/device generalizability assessment.
- Moderate performance for mortality prediction using imaging alone.
Future Directions: Conduct multicenter external validation, workflow integration studies, and cost-effectiveness analyses; assess performance across skin tones and hemodynamic states.
With sepsis remaining a leading cause of mortality, early identification of patients with sepsis and those at high risk of death is a challenge of high socioeconomic importance. Given the potential of hyperspectral imaging (HSI) to monitor microcirculatory alterations, we propose a deep learning approach to automated sepsis diagnosis and mortality prediction using a single HSI cube acquired within seconds. In a prospective observational study, we collected HSI data from the palms and fingers of more than 480 intensive care unit patients. Neural networks applied to HSI measurements predicted sepsis and mortality with areas under the receiver operating characteristic curve (AUROCs) of 0.80 and 0.72, respectively. Performance improved substantially with additional clinical data, reaching AUROCs of 0.94 for sepsis and 0.83 for mortality. We conclude that deep learning-based HSI analysis enables rapid and noninvasive prediction of sepsis and mortality, with a potential clinical value for enhancing diagnosis and treatment.
2. A systematic review and meta-analysis of noradrenaline compared to adrenaline in the management of septic shock.
Across five RCTs, adrenaline and noradrenaline yielded similar mortality, hemodynamic recovery, vasopressor-free days, and dysrhythmias in septic shock. Noradrenaline produced a greater reduction in lactate at 24 hours; overall certainty was low to very low.
Impact: Clarifies an ongoing guideline discrepancy by showing similar outcomes between two first-line vasopressors, informing practice where availability and cost vary.
Clinical Implications: Both agents are reasonable options; selection can be based on availability, patient factors, and cost. Monitoring lactate kinetics may still favor noradrenaline in some settings.
Key Findings
- No meaningful differences in mortality between adrenaline and noradrenaline (RR 0.99, 95% CI 0.83–1.18).
- Similar time to mean arterial pressure improvement, vasopressor-free days, and dysrhythmias.
- Greater 24-hour lactate reduction with noradrenaline; overall certainty rated low to very low by GRADE.
Methodological Strengths
- Systematic methods with AGREE II, AMSTAR 2, and Cochrane RoB 2.0; PROSPERO registered.
- Random-effects meta-analysis with GRADE certainty ratings across key clinical outcomes.
Limitations
- Small number of RCTs and low-to-very-low certainty limit definitive conclusions.
- Potential heterogeneity in dosing protocols and co-interventions across trials.
Future Directions: Large pragmatic RCTs comparing vasopressors with standardized co-interventions and robust patient-centered outcomes, including cost-effectiveness in diverse settings.
BACKGROUND: Septic shock is associated with significant mortality. The International Surviving Sepsis Campaign guidelines recommend noradrenaline as first-line vasopressor, whilst South African guidelines recommend adrenaline. Clinical trials show similar efficacy but suggest safety advantages for noradrenaline. We reviewed the evidence comparing noradrenaline and adrenaline in the initial management of adult patients with septic shock. METHODS: We searched PubMed, Epistemonikos, Cochrane Library, and clinical trial registries for clinical practice guidelines, health technology assessments, and systematic reviews of randomised controlled trials (RCTs) through July 2024. We appraised these using AGREE II and AMSTAR 2 tools and assessed eligible RCTs extracted from systematic reviews with Cochrane's Risk of Bias 2.0 Tool. We estimated random-effects rate ratios (RR) and mean differences (MD) with 95 % confidence intervals and rated certainty of evidence using GRADE. Key outcomes included mortality, time to shock reversal, and adverse effects. (PROSPERO: CRD42022368373). RESULTS: We identified three guidelines, one systematic review, from which five RCTs were extracted. Comparing adrenaline to noradrenaline, we found little to no difference in mortality (RR 0.99, 0.83 to 1.18), time to improvement of mean arterial pressure (MD 7.17 min, -16.74 to 31.08), vasopressor-free days (MD -0.05 days, -4.07 to 3.96), or dysrhythmias (RR 0.92, 0.59 to 1.45). Change in lactate concentrations 24 h after resuscitation was lower for noradrenaline than adrenaline. The certainty of evidence was assessed as low to very low. CONCLUSION: Adrenaline and noradrenaline are associated with similar outcomes in managing septic shock. The choice of vasopressor should be based on availability, patient population, and cost.
3. Stone culture, bladder or pelvic urine culture: the most helpful tool for an endourologist - a review of literature from EAU section of endourology.
Across 21 studies, pre-operative bladder urine culture had poor concordance with intra-operative cultures and lower predictive value for post-URS/PCNL SIRS and urosepsis. Renal pelvis and stone cultures were concordant, with stone culture being the best predictor of infectious complications.
Impact: Offers actionable guidance to reduce post-procedural urosepsis by emphasizing intra-operative renal pelvis/stone cultures over pre-operative bladder cultures.
Clinical Implications: During URS/PCNL, collect renal pelvis and stone cultures to better guide antimicrobial therapy, particularly in high-risk patients, rather than relying on pre-operative bladder cultures.
Key Findings
- Pre-operative bladder urine culture showed poor concordance with intra-operative cultures.
- Renal pelvis and stone cultures had significant concordance.
- Stone culture was the best predictor of post-operative SIRS and urosepsis after URS/PCNL.
Methodological Strengths
- PRISMA-compliant systematic review with clear PICO question.
- Focus on clinically relevant outcomes (SIRS, sepsis) across multiple studies.
Limitations
- Heterogeneity and predominance of observational designs may bias pooled inferences.
- Lack of standardized culture techniques and definitions across studies.
Future Directions: Prospective multicenter studies standardizing intra-operative culture methods and thresholds, linking results to targeted antimicrobial strategies and patient outcomes.
PURPOSE: Urosepsis is a potential life-threatening complication of minimally invasive endourological procedures. High discordance rates exist between bladder urine cultures and cultures from the upper tract (renal pelvis and stones cultures). Aim of this systematic review is to summarise the evidence on the clinical value of pre-operative bladder urine culture (PBUC), renal pelvis urine culture (RPUC) and stone cultures (SC) in predicting post-operative infective complications after URS or PCNL. METHODS: A systematic review was performed in accordance to the PRISMA guidelines. The PICO model of the clinical search question was: Patients - patients undergoing PCNL or URS; Intervention - intra-operative RPUC and SC; Comparison - compared to pre-operative BUC; Outcome - prediction of post-operative systemic inflammatory response syndrome (SIRS) or sepsis. Studies included were published between 2004 and 2024. RESULTS: 21 studies were included. PBUC was shown to have a poor concordance rate with intra-operative cultures. PBUC had a lower value in predicting post-operative SIRS and sepsis compared to intra-operative cultures. A significant concordance rate was found between RPUC and SC. SC were the best predictors of the development of post-operative SIRS and urosepsis. CONCLUSION: A pre-operative bladder urine culture is often not representative of the upper tract microbiological environment. Collecting renal pelvis urine cultures and stone cultures during RIRS and PCNL should be the standard of care, especially in high risk patients.