Daily Anesthesiology Research Analysis
Today’s top anesthesiology/critical care papers span practice-changing ICU monitoring, a mechanistic pain discovery, and updated ICU nutrition guidance. A double-blind RCT shows polyethylene arterial catheters markedly reduce arterial line insufficiency vs polyurethane in post–cardiac surgery ICU patients; a Pain study uncovers a STIM1–TRPA1 endoplasmic reticulum coupling that drives nociception; and French expert societies release GRADE-based ICU nutrition guidelines across adults and children.
Summary
Today’s top anesthesiology/critical care papers span practice-changing ICU monitoring, a mechanistic pain discovery, and updated ICU nutrition guidance. A double-blind RCT shows polyethylene arterial catheters markedly reduce arterial line insufficiency vs polyurethane in post–cardiac surgery ICU patients; a Pain study uncovers a STIM1–TRPA1 endoplasmic reticulum coupling that drives nociception; and French expert societies release GRADE-based ICU nutrition guidelines across adults and children.
Research Themes
- ICU monitoring and vascular access performance
- Mechanistic pain biology and ion channel signaling
- Evidence-based nutrition strategies in critical care
Selected Articles
1. Comparison of the Incidence of Arterial Pressure Line Insufficiency Between Polyethylene and Polyurethane Catheters in the ICU: A Randomized Study.
In a double-blind RCT of post–cardiac surgery ICU patients, polyethylene arterial catheters markedly reduced arterial line insufficiency versus polyurethane (5.8% vs 28.6%; RR 0.15). The trial was stopped early at interim analysis due to benefit.
Impact: This pragmatic RCT provides immediate, actionable evidence to choose catheter material that lowers arterial line failures in ICU care.
Clinical Implications: Consider preferentially using polyethylene arterial catheters for invasive blood pressure monitoring in cardiac ICU settings to reduce waveform damping, flushing/drawing failures, and early line dysfunction.
Key Findings
- Double-blind RCT (n=132 at interim) showed arterial line insufficiency was 5.8% (polyethylene) vs 28.6% (polyurethane).
- Relative risk for insufficiency with polyethylene was 0.15 (95% CI 0.05–0.48; p=0.001).
- Trial was stopped early per O’Brien–Fleming boundary due to clear benefit.
- Insufficiency defined by four objective criteria including waveform damping and blood draw/flush failure.
Methodological Strengths
- Double-blinded, randomized, superiority design with predefined composite outcome
- Interim analysis with O’Brien–Fleming boundary and objective bedside criteria
Limitations
- Single-country, single-center cardiovascular ICU limits generalizability
- Outcome assessed at a single early time point (first noon) without longer follow-up
Future Directions: Replicate across diverse ICUs, surgical populations, and longer dwell times; assess thrombosis, infection, cost, and patient-centered outcomes.
OBJECTIVES: Continuous arterial pressure monitoring is crucial for critically ill patients. However, the impact of catheter type on arterial line insufficiency remains unexamined. DESIGN: Double-blinded, superiority, randomized controlled trial. SETTING: A cardiovascular center in Japan. PATIENTS: Adult patients scheduled for elective cardiovascular surgery and postoperative admission to the ICU. INTERVENTIONS: Patients were randomly assigned either polyethylene or polyurethane catheters. MEASUREMENTS AND MAIN RESULTS: The outcome of interest was arterial line insufficiency, defined by one or more of the following four criteria: flattened or overdamped blood pressure waveform, sluggish free backflow of blood (> 2 s) when the stopcock was opened to the atmosphere, inability to draw blood from the arterial line, and inability to flush the catheter. The frequency of arterial line insufficiency was observed at the first noon after ICU admission. An interim analysis using the chi-square test was performed after half of the participants were enrolled, with early termination if p value of less than 0.005 based on the O'Brien-Fleming method. Interim analysis of 132 patients revealed significant differences in primary outcomes, leading to early termination of the trial. Arterial line insufficiency occurred in four of 69 patients (5.8%) with polyethylene catheters and 18 of 63 patients (28.6%) with polyurethane catheters (relative risk, 0.15; 95% CI, 0.05-0.48; p = 0.001). CONCLUSIONS: This study demonstrated a lower occurrence rate of arterial line insufficiency with polyethylene arterial catheters than polyurethane catheters.
2. STIM1 functionally couples to transient receptor potential ankyrin 1 contributing to nociception.
Preclinical work shows that TRPA1 activation triggers ER Ca2+ release, STIM1 translocation, and SOCE, identifying a functional STIM1–TRPA1ER coupling in nociceptors. STIM1 loss dampened cold/chemical/mechanical nociception, and SOCE increased excitability via ERK-dependent suppression of Kv4 currents.
Impact: This is a first-of-its-kind mechanistic link between ER-localized TRPA1 and STIM1-mediated SOCE in nociception, opening druggable avenues beyond classical plasma membrane TRP targets.
Clinical Implications: While preclinical, targeting STIM1–SOCE or the TRPA1ER–STIM1 axis could yield non-opioid analgesics for cold, chemical, and inflammatory pain states.
Key Findings
- TRPA1 activation triggers ER Ca2+ release, STIM1 translocation, and SOCE; TRPA1 is present in ER fractions.
- Conditional loss or knockdown of STIM1 in sensory neurons reduces cold-, AITC-, and bradykinin-evoked Ca2+ entry and nociception.
- Thapsigargin-induced nociception is attenuated by STIM1 deletion/knockdown in DRG.
- STIM1-mediated SOCE increases excitability by reducing Kv4 outward currents via MAPK/ERK signaling.
Methodological Strengths
- Multimodal approach: genetics (conditional knockout/knockdown), pharmacology, calcium imaging, electrophysiology, behavior
- Sex-inclusive design (male and female mice) and convergent evidence across in vivo and ex vivo systems
Limitations
- Preclinical mouse/neuronal systems; clinical translatability not yet established
- Precise molecular interfaces between TRPA1ER and STIM1 were not structurally resolved
Future Directions: Define structural determinants of TRPA1ER–STIM1 coupling, develop selective SOCE/TRPA1ER modulators, and test efficacy in translational pain models and early-phase clinical studies.
STIM1 is a calcium sensor that can sense calcium level changes in the endoplasmic reticulum (ER) and respond to extracellular stimuli. We have reported that STIM1 is expressed in nociceptors. However, its functional significance remains unclear. Here, we show that STIM1 plays an important role in sensing cold, chemical, and noxious mechanical stimuli in both male and female mice. We found that activation of transient receptor potential ankyrin 1 (TRPA1) triggers ER Ca2+ release, STIM1 translocation, and store-operated Ca2+ entry (SOCE). Immunostaining and western blot results reveal that TRPA1 is expressed in the ER. In addition, STIM1 deficiency in the primary sensory neurons reduces cold-, allyl isothiocyanate (TRPA1 agonist)-, and bradykinin-induced Ca2+ entry and nociception. Moreover, intraplantar injection of thapsigargin, an ER Ca2+-ATPase inhibitor, evokes nociception and increases pain hypersensitivity, which is significantly attenuated in STIM1 conditional knockout or L3/L4 dorsal root ganglia STIM1 knockdown mice. Mechanistic studies demonstrate that STIM1-mediated SOCE increases neuronal excitability and decreases potassium channel Kv4-mediated outward currents in small to medium-sized dorsal root ganglion neurons, which is abolished by inhibiting the mitogen-activated protein kinase/extracellular receptor kinase pathway. Our findings demonstrate that STIM1 acts as a transducer of nociception and uncover a novel link between STIM1 and TRPA1ER. Our study also provides new insights into TRPA1-mediated nociception.
3. Expert consensus‑based clinical practice guidelines for nutritional support in the intensive care unit: the French Intensive Care Society (SRLF) and the French-Speaking Group of Pediatric Emergency Physicians and Intensivists (GFRUP).
French expert societies issued GRADE-based ICU nutrition guidelines (34 adult and 29 pediatric recommendations), integrating recent RCTs and emphasizing individualized strategies. Only a minority of recommendations are supported by high-level evidence, especially in pediatrics.
Impact: Guidelines unify contemporary evidence into pragmatic recommendations across adult and pediatric ICUs, shaping feeding routes, timing, and targets.
Clinical Implications: Adopt individualized nutrition plans in ICU, guided by GRADE-based recommendations regarding timing, route (enteral vs parenteral), energy/protein targets, and monitoring, while recognizing evidence gaps in pediatrics.
Key Findings
- 24 PICO questions yielded 34 adult and 29 pediatric recommendations using GRADE.
- Adult recommendations: 3 high-level, 12 moderate, 19 expert opinion; pediatric: 1 high-level, 5 moderate, 23 expert opinion.
- Strong expert agreement across all recommendations; emphasis on individualized strategies.
Methodological Strengths
- GRADE methodology with explicit PICO framing and expert multidisciplinary collaboration
- Integration of recent landmark randomized trials
Limitations
- Many recommendations rely on moderate/low evidence or expert opinion, particularly in pediatric ICU
- Guideline scope excludes neonates and burn patients
Future Directions: Prioritize high-quality RCTs in pediatric ICU nutrition, refine targets for energy/protein delivery, and assess outcomes including infections, ventilator days, and long-term function.
The objective of this work was to develop guidelines for nutritional support in critically ill adults and children (excluding neonates and burn patients) unable to maintain an adequate oral intake. We aimed to provide up-to-date recommendations based on high-level evidence including the results of recent landmark randomized controlled trials. Experts from the French Intensive Care Society (SRLF), the French Society of Clinical Nutrition and Metabolism (SFNCM), and the French-Speaking Group of Pediatric Emergency Physicians and Intensivists (GFRUP) used the GRADE methodology to develop the guidelines. Twenty-four Patient Intervention Comparator Outcome (PICO) questions were identified, resulting in 34 adult and 29 pediatric recommendations. Of the 34 recommendations for adults, three were based on high-level evidence, 12 on moderate-level evidence, and 19 on expert opinion. The corresponding numbers for the 29 pediatric recommendations were one, five, and 23. All recommendations achieved strong agreement among the experts. These guidelines emphasize the importance of individualized nutritional support strategies that incorporate recent high-quality evidence to optimize the outcomes of critically ill patients.