Daily ReportOct 21, 2026
Anesthesiology, October 21 edition
We read 8 papers and selected 3.
Summary
The most impactful papers addressed system-level pediatric surgical capacity, objective electroencephalographic characterization of anesthetic transitions, and the relationship between frailty and intraoperative hypotension. The findings emphasize scalable anesthesia and surgical care frameworks, improved monitoring approaches, and the need to distinguish hypotension occurrence from its duration in vulnerable older adults.
Research Themes
- Global and pediatric surgical system planning
- Electroencephalographic monitoring of anesthetic state
- Frailty and perioperative hemodynamic instability
Selected Articles
1. Optimal Resources for Children's Surgery 2: Tiered Recommendations for Minimum Essential Children's Surgical Procedures Across Health System Levels.
OReCS 2 updates a global framework defining minimum essential pediatric surgical procedures and capabilities across health-center, first-, second-, third-, and referral-level hospitals. Recommendations were developed through literature review and an iterative Delphi-like process involving 21 specialty groups and participants from more than 50 low- and middle-income and high-income countries.
Impact: This work translates global surgical policy into operational, tiered recommendations for pediatric procedures, personnel, equipment, and referral pathways. Its system-level framework can guide service planning and resource allocation in settings with limited anesthesia and surgical capacity.
Clinical Implications: Health systems can use the recommendations to determine which pediatric procedures should be performed locally, which require stabilization and referral, and what anesthesia, equipment, and personnel are needed at each hospital level. This may improve triage, referral safety, and equitable access to essential pediatric surgery.
Key Findings
- Procedures at health centers were generally limited to interventions not requiring anesthesia or sedation, with emphasis on stabilization and transfer.
- First-level hospitals primarily provided stabilization and referral, while selected specialties such as ophthalmology and dental surgery could perform definitive procedures at lower levels.
- National children's hospitals were assigned complex procedures requiring specialized providers and equipment, including transplantation, congenital heart repair, and complex reconstructive surgery.
Methodological Strengths
- International multidisciplinary participation included 21 specialty working groups and contributors from more than 50 low- and middle-income and high-income countries.
- Recommendations combined literature review, iterative consensus development, a predefined greater-than-75% agreement threshold, and executive-board review based on experience in lower-level facilities.
Limitations
- The recommendations were based partly on expert consensus and executive-board judgment rather than comparative outcome data.
- The framework is not intended to be exhaustive, and local disease burden, workforce availability, regulation, and referral infrastructure may limit direct implementation.
Future Directions: Future research should evaluate implementation of the tiered recommendations against measurable outcomes such as referral delays, perioperative mortality, avoidable complications, workforce requirements, and access to pediatric anesthesia. Regional adaptation and prospective monitoring will be important for validating feasibility.
BACKGROUND: In 2015 the World Health Assembly (WHO), based on recommendations by the Lancet Commission on Global Surgery, passed resolution (68:15) on strengthening emergency and essential surgical care and anesthesia as a component of universal health coverage. However, children's surgery was not adequately represented and in response, the Global Initiative for Children's Surgery (GICS) published the Optimal Resources for Children's Surgical Care (OReCS) in 2019 providing insight into procedures which should be performed at different facility types. OReCS 2 addresses a gap in both policy and published literature to further define surgical conditions and procedural capabilities by hospital level.
2. Portable polysomnography-derived multi-domain EEG markers of anesthetic state transitions during propofol anesthesia for gastrointestinal endoscopy.
In 31 adults undergoing gastrointestinal endoscopy, portable six-channel EEG demonstrated stage-related changes in spectral power, spectral edge frequency, spindle-like events, and functional connectivity during propofol anesthesia. The findings support portable EEG as a candidate tool for detecting emergence and atypical anesthetic states, although real-time titration and excessive-sedation warning remain unvalidated.
Impact: The study extends anesthetic EEG research into a brief, stimulus-rich procedural setting using a portable and clinically interpretable platform. It identifies multiple candidate markers that could support future emergence monitoring and individualized procedural sedation.
Clinical Implications: Portable multi-domain EEG may eventually help identify inadequate, excessive, or recovering anesthesia during gastrointestinal endoscopy, particularly where full electroencephalographic monitoring is impractical. Clinical adoption requires validation against patient responsiveness, adverse events, anesthetic dose, and recovery outcomes.
Key Findings
- Relative delta power decreased from baseline and induction to maintenance and recovery, while theta, alpha, sigma, beta power, and spectral edge frequency generally increased.
- Spindle-like event density varied by anesthetic stage and was highest during recovery, with mean duration and peak frequency remaining relatively stable in the 11-16 Hz range.
- Amplitude envelope correlation showed the most widespread stage-related connectivity changes, whereas phase-based metrics demonstrated fewer corrected changes.
Methodological Strengths
- Prospective continuous recording covered four clinically defined anesthetic stages in the same participants.
- The analysis integrated spectral power, spectral edge frequency, spindle-like events, and three functional-connectivity metrics with mixed-effects and permutation-based methods including false-discovery-rate correction.
Limitations
- The sample was small, with 31 adults undergoing gastrointestinal endoscopy, limiting generalizability across procedures, age groups, and anesthetic regimens.
- The study identified associations with clinically defined stages but did not validate markers against real-time sedation depth, patient responsiveness, adverse events, or propofol titration outcomes.
Future Directions: Larger prospective studies should validate these markers against standardized sedation scales, behavioral responsiveness, drug concentrations or doses, airway events, and recovery endpoints. Algorithms combining spectral and connectivity features should be tested prospectively for emergence detection and excessive-sedation alerts.
BACKGROUND: Propofol anesthesia is widely used for gastrointestinal (GI) endoscopy, but electroencephalographic (EEG) features of anesthetic state transitions in this brief and stimulus-rich setting remain incompletely characterized. This study aimed to describe clinically interpretable EEG markers across anesthetic stages using portable polysomnography (PSG)-derived six-channel EEG. METHODS: In this prospective observational study, 31 adults undergoing GI endoscopy under propofol-based anesthesia underwent continuous portable PSG recording. EEG analyses focused on six scalp channels (F3, F4, C3, C4, O1, and O2) across four clinically defined stages: baseline, induction, maintenance, and recovery. Relative spectral power, spectral edge frequency at 95% cumulative power (SEF95), and spindle-like event metrics were quantified.
3. Frailty and intraoperative hypotension in older adults undergoing hip fracture surgery: a retrospective cohort study.
Among 522 older adults undergoing hip fracture surgery, frailty was not independently associated with whether intraoperative hypotension occurred. However, frail patients had a longer cumulative duration of hypotension than prefrail patients, suggesting that frailty may influence the persistence rather than the initiation of hemodynamic instability.
Impact: The negative primary finding challenges the assumption that frailty alone predicts the occurrence of intraoperative hypotension. The distinction between hypotension incidence and cumulative duration may refine hemodynamic risk assessment and perioperative monitoring in older surgical patients.
Clinical Implications: Frailty should not be used as the sole criterion for predicting whether intraoperative hypotension will occur. Nevertheless, frail patients may require closer monitoring and prompt treatment once hypotension develops, with attention to operative factors, general anesthesia, antihypertensive medication, and fluid management.
Key Findings
- Among 522 patients, 23.8% were frail, 65.3% prefrail, and 10.9% robust; intraoperative hypotension occurred in 57.1%.
- Frailty was not independently associated with hypotension occurrence: adjusted odds ratio 0.77 for frail versus robust patients, with a 95% confidence interval of 0.38-1.53.
- Frail patients had a longer cumulative duration of hypotension than prefrail patients, while independent predictors of hypotension included intertrochanteric fracture, general anesthesia, preoperative antihypertensive medication, longer surgery, and colloid infusion.
Methodological Strengths
- The study used a clinically relevant cohort of 522 older adults undergoing hip fracture surgery and applied a defined frailty instrument, the 11-item modified frailty index.
- Multivariable logistic regression and adjusted quantile regression separately evaluated hypotension occurrence and cumulative duration, addressing two distinct aspects of hemodynamic instability.
Limitations
- The retrospective single-center design may be affected by residual confounding, selection bias, and limitations in the accuracy or completeness of recorded blood-pressure measurements.
- The prediction model had modest discrimination, with an area under the curve of 0.665, and the study did not establish whether longer hypotension duration caused postoperative complications.
Future Directions: Prospective multicenter studies should use standardized blood-pressure measurement and hypotension definitions, examine continuous hemodynamic trajectories, and test whether frailty-guided monitoring or treatment reduces hypotension duration and postoperative complications. Mechanistic studies should explore why frailty may impair recovery from hypotension.
BACKGROUND: Frailty is common among older adults and is associated with adverse postoperative outcomes. Hip fractures are increasingly prevalent in aging populations and frequently require urgent surgical intervention. Intraoperative hypotension (IOH) is a common perioperative complication associated with serious postoperative morbidity. However, the relationship between frailty and IOH remains unclear. This study aimed to investigate the association between frailty, assessed using the 11-item modified frailty index (mFI-11), and IOH in older adults undergoing hip fracture surgery. METHODS: This retrospective cohort study included 522 patients aged ≥ 65 years who underwent hip fracture surgery at a tertiary care hospital in southern Thailand between January 2019 and June 2024. Patients were classified as frail (mFI-11 ≥ 0.27), prefrail (> 0 to < 0.27), or robust (0). IOH was defined as a mean arterial pressure (MAP) < 65 mmHg or a ≥ 20% reduction from baseline MAP in patients with hypertension.