Anesthesiology and Surgical Oncology Research Group

Image-guided percutaneous tumor ablation has become a crucial minimally invasive alternative to surgical resection, with high rates of success dependent on precision in probe placement and energy delivery. A significant challenge in this procedure is respiratory-induced organ movement, notably in the liver, lungs, and kidneys, decreasing procedural accuracy and leading to extended procedure time and elevated radiation exposure. High-frequency jet ventilation (HFJV) addresses these issues by minimizing respiratory movement, providing a nearly static field that enhances procedural precision and efficiency. In this review, we discuss the use of HFJV in tumor ablation procedures, highlighting its potential advantages over conventional ventilation, such as reducing probe misplacement and radiation exposure. These advantages, plus its well-established safety profile, represent a promising advancement in resolving respiratory movement challenges. Through the synthesis of recent studies and clinical experiences, this review underscores HFJV's potential to revolutionize image-guided tumor ablation. Future research on standardizing protocols, optimizing HFJV settings, and implementation strategies is encouraged.

IntroductionMethadone has emerged as a promising option for perioperative pain management, primarily due to its rapid onset of action and prolonged duration of effect, which provides sustained analgesic benefits. Despite its clinical advantages and minimal reported risks for postoperative respiratory depression, concerns about its potential respiratory complications persist. This protocol outlines a meta-analysis aimed at evaluating the risk of respiratory depression associated with methadone administration in the perioperative setting compared with other opioids or placebo.Methods and analysisWe will perform a systematic review of literature published in English from 1 January 1970 to the present using Ovid MEDLINE, Ovid Embase and Cochrane CENTRAL. Eligible studies will consist of randomised controlled trials, cohort studies and case–control studies reporting respiratory depression in surgical patients receiving intravenous methadone. Case reports, reviews and non-English studies will be excluded. The primary outcome is respiratory depression, defined as naloxone administration, a respiratory rate of fewer than 8 breaths per minute, or an arterial oxygen saturation below 90%. Secondary outcomes include the timing and dose–response effect of methadone on respiratory depression. Bias will be evaluated using the Cochrane Risk of Bias Assessment 2 and ROBINS-I tools. Meta-analyses will be performed, and effect estimates will be presented as relative risks or ORs with 95% CIs. The certainty of the evidence will be assessed using Grading of Recommendations Assessment, Development and Evaluation methodology.Ethics and disseminationEthics approval is not necessary for this systematic review and meta-analysis. The results will be published in a peer-reviewed journal and presented at national and international conferences focused on perioperative medicine and pain management.PROSPERO registration numberCRD42025630383.

Cancer persists as a significant global health challenge, responsible for nearly 10 million deaths annually, representing one-sixth of all deaths [1].Gastrointestinal cancers, including colorectal, liver, stomach, oesophagus and pancreas, account for approximately 34% of these fatalities [1].Despite the development of screening

Prediction and avoidance of intraoperative hypotension (IOH) can lead to less postoperative morbidity. Machine learning (ML) is increasingly being applied to predict IOH. We hypothesize that incorporating demographic and physiological features in an ML model will improve the performance of IOH prediction. In addition, we added a “dial” feature to alter prediction performance. An ML prediction model was built based on a multivariate random forest (RF) trained algorithm using 13 physiologic time series and patient demographic data (age, sex, and BMI) for adult patients undergoing hepatobiliary surgery. A novel implementation was developed with an adjustable, multi-model voting (MMV) approach to improve performance in the challenging context of a dynamic, sliding window for which the propensity of data is normal (negative for IOH). The study cohort included 85% of subjects exhibiting at least one IOH event. Males constituted 70% of the cohort, median age was 55.8 years, and median BMI was 27.7. The multivariate model yielded average AUC = 0.97 in the static context of a single prediction made up to 8 min before a possible IOH event, and it outperformed a univariate model based on MAP-only (average AUC = 0.83). The MMV model demonstrated AUC = 0.96, PPV = 0.89, and NPV = 0.98 within the challenging context of a dynamic sliding window across 40 min prior to a possible IOH event. We present a novel ML model to predict IOH with a distinctive “dial” on sensitivity and specificity to predict first IOH episode during liver resection surgeries.

Melanoma survival has greatly improved with the advent of immunotherapy, but unequal access to these medications may exist due to nonmedical patient factors such as insurance status, educational background, and geographic proximity to treatment. We used the National Cancer Database to assess patients with nonmetastatic cutaneous melanoma who underwent surgical resection and sentinel lymph node biopsy (SLNB) with tumor involvement from 2015 to 2020. We evaluated rates of adjuvant immunotherapy among this patient population based on patient, tumor, and facility variables, including insurance status, socioeconomic status, pathologic stage (IIIA-IIID), and treatment facility type and volume. Adjuvant immunotherapy was associated with improved survival for stage III melanoma, with a slight increase in 5-year OS for stage IIIA (87.9% vs. 85.9%, P=0.044) and a higher increase in stages IIIB-D disease (70.3% vs. 59.6%, P<0.001). Receipt of adjuvant immunotherapy was less likely for patients who were older, low socioeconomic status, or uninsured. Low-volume and community cancer centers had higher rates of adjuvant immunotherapy overall for all stage III patients, whereas high-volume and academic centers used adjuvant immunotherapy much less often for stage IIIA patients compared with those in stages IIIB-D. Our results demonstrate inconsistent use of adjuvant immunotherapy among patients with stage III melanoma despite a significant association with improved survival. Notably, there was a lower use of adjuvant immunotherapy in patients of lower SES and those treated at high-volume centers. Equity in access to novel standards of care represents an opportunity to improve outcomes for patients with melanoma.

Background: Enhanced recovery after surgery (ERAS) is a multimodal, multidisciplinary approach aimed at reducing organ failure and mitigating stress reactions in surgery patients. This investigation sought to assess available data concerning the benefits of ERAS protocols in improving patient outcomes for individuals undergoing significant colorectal surgery.Methods: The study involved 65 patients who underwent colectomy and lower anterior resection for rectal cancers. Patients were divided into three groups: Group 1 comprised 22 patients enrolled retrospectively who received the traditional protocol; Group 2 consisted of 20 patients enrolled prospectively who received the ERAS protocol; and Group 3 included 23 patients enrolled retrospectively who received the ERAS protocol. Each patient underwent a comprehensive history, physical examination, laboratory testing, computed tomography, MRI, and chest radiography.Results: Hospital stay durations were significantly shorter in both ERAS groups during the first and second cycles compared to the non-ERAS group (P<0.001, <0.001), with no significant difference between ERAS groups in either cycle. Delayed intestinal motility was significantly more pronounced in the non-ERAS group compared to ERAS groups in both cycles (P=0.005), with only five (22.7%) cases reported in the non-ERAS group.Conclusion: ERAS implementation in the perioperative management of colorectal surgery patients is associated with improved outcomes and shorter recovery times. Implementation of ERAS in hospitals is feasible and beneficial.

Background: The well-recognized risk of injury to the recurrent laryngeal nerve (RLN) during thyroidectomy has instigated various preventive measures. One such measure involves directly visualizing the RLN, but this is not always feasible in practice. A more recent approach involves using intraoperative neuromonitoring to identify and preserve the RLN. This study aims to evaluate the effectiveness of intraoperative neuromonitoring compared to single visualization of the RLN in averting nerve injury.Methods: We conducted a retrospective, observational, and descriptive study on a cohort of 218 patients. A Chi-square test was employed to determine the influence of intraoperative neuromonitoring on the incidence of nerve injury, with P < 0.05 considered statistically significant. We used Jamovi software version 2.3.18 to analyze the data.Results: Of the 218 patients, intraoperative neuromonitoring was used in 150 (68.8%) cases; none of which resulted in nerve injury. Conversely, 68 (31.2%) patients underwent surgery without the use of neuromonitoring, with two (2.9%) patients in this group experiencing nerve injury (p=0.037). In comparison, the risk of nerve injury was 0% in the group monitored intraoperatively and 2.94% in the group that did not undergo intraoperatively neuromonitoring. Further, the relative risk of complications was 0.66% in patients operated with neuromonitoring, while it was 5.88% in the group operated without neuromonitoring, thus demonstrating a clinically significant protective against vasculonervous complications.Conclusion: The results advocate for the use of intraoperative neuromonitoring, whenever available, as it is a safe method for significantly decreasing the incidence of RLN injury during thyroidectomy compared with only visualization.