Laparoscopic vs robotic inguinal hernia repair: a comparison of learning curves and skill transference in general surgery residents.

BACKGROUND: There is no consensus on whether laparoscopic experience should be a prerequisite for robotic training. Further, there is limited information on skill transference between laparoscopic and robotic techniques. This study focused on the general surgery residents' learning curve and skill transference within the two minimally invasive platforms. METHODS: General surgery residents were observed during the performance of laparoscopic and robotic inguinal hernia repairs. The recorded data included objective measures (operative time, resident participation indicated by percent active time on console or laparoscopy relative to total case time, number of handoffs between the resident and attending), and subjective evaluations (preceptor and trainee assessments of operative performance) while controlling for case complexity, patient comorbidities, and residents' prior operative experience. Wilcoxon two-sample tests and Pearson Correlation coefficients were used for analysis. RESULTS: Twenty laparoscopic and forty-four robotic cases were observed. Mean operative times were 90 min for robotic and 95 min for laparoscopic cases (P = 0.4590). Residents' active participation time was 66% on the robotic platform and 37% for laparoscopic (P = < 0.0001). On average, hand-offs occurred 9.7 times during robotic cases and 6.3 times during laparoscopic cases (P = 0.0131). The mean number of cases per resident was 5.86 robotic and 1.67 laparoscopic (P = 0.0312). For robotic cases, there was a strong correlation between percent active resident participation and their prior robotic experience (r = 0.78) while there was a weaker correlation with prior laparoscopic experience (r = 0.47). On the other hand, prior robotic experience had minimal correlation with the percent active resident participation in laparoscopic cases (r = 0.12) and a weak correlation with prior laparoscopic experience (r = 0.37). CONCLUSION: The robotic platform may be a more effective teaching tool with a higher degree of entrustability indicated by the higher mean resident participation. We observed a greater degree of skill transference from laparoscopy to the robot, indicated by a higher degree of correlation between the resident's prior laparoscopic experience and the percent console time in robotic cases. There was minimal correlation between residents' prior robotic experience and their participation in laparoscopic cases. Our findings suggest that the learning curve for the robot may be shorter as prior robotic experience had a much stronger association with future robotic performance compared to the association observed in laparoscopy.

A Supportive Culture Maintains General Surgery Wellness.

Social restrictions during the pandemic required creative solutions for incorporating interns into a demanding residency, building relationships, and fostering resiliency. We hypothesized that resident-driven initiatives focused on inclusion would overcome a lack of in-person events. An anonymous survey was administered to all surgery residents to assess burnout pre- and post-wellness interventions. Assessment scores were analyzed with Mann-U Whitney and Kruskal-Wallis tests. The surveys were completed by 71.6% (n = 53) and 48.6% (n = 36) of residents, respectively, and demonstrated high metrics for wellness measures. There were no significant differences on the 6-month post-assessment, suggesting interventions preserved high ratings. The PGY1 subgroup demonstrated improvement in the ability to identify a faculty mentor (P < .01) and had reduced burnout measures (P < .05). Surgical resident wellness is not dependent on department-wide gatherings; rather, resident-driven interventions in the workspace and intimate social support demonstrated an impact on wellness and reduced burnout.

General surgery applicant perspectives: Two years of virtual interview experiences and supplemental application impressions.

BACKGROUND: We sought to evaluate the unique benefits and challenges the virtual recruitment and interviewing platform had on general surgery residency applicants. METHODS: Applicants who interviewed for a categorical position at our institution during the 2021 and 2022 Match season were contacted to participate in the anonymous online survey focused on applicant behavior related to the virtual interview format. Data were analyzed using chi-square and paired t-tests. RESULTS: A response rate of 56.7 â€‹% (n â€‹= â€‹135) was achieved. Applicants accepted a median of 17 (IQR 13-20) interviews in 2021 and 15 (IQR 11-19) interviews in 2022. More than half (54 â€‹%) of applicants indicated they applied to more programs, and 53 â€‹% accepted more interviews, because of the virtual format. The greatest advantages of the virtual interviews as cited by applicants were saving money (96.3 â€‹%), saving time (49.6 â€‹%), and avoiding travel risks (43.7 â€‹%). The top limitations of virtual interviews were less exposure to current residents and faculty (61.5 â€‹%), to the city or location of the program (58.5 â€‹%), and difficultly comparing programs (57.8 â€‹%). The 2022 Match cycle included use of the supplemental application; however, 85 â€‹% of applicants did not feel that the supplemental improved their overall application. Some applicants (20 â€‹%) who "signaled" programs did not receive an interview offer from any of the programs they signaled. CONCLUSION: The transition to virtual interviews saved applicants time and money but limited their exposure. Future efforts to maintain virtual interviews will need to be balanced against the intangible benefit of human interaction and observing a program's culture.

Skill transference and learning curves in novice learners: a randomized comparison of robotic and laparoscopic platforms.

BACKGROUND: While well-established protocols direct laparoscopic training, there remains a relative paucity of guidelines for robotic education. Furthermore, it is unknown how exposure to one platform influences trainees' proficiency in the other. This study aimed to compare and quantify (1) learning curves and (2) transference of skill between the two modalities in novice learners. METHODS: Thirty pre-clinical medical students were randomized into two groups. One group performed the peg-transfer task using the robot first, followed by laparoscopy, while the other group performed the same task laparoscopically first. Participants completed five repetitions with each methodology. Participants were timed and errors were recorded. We hypothesized that laparoscopic experience with the peg-transfer task would assist in completing the task robotically, and there would be a higher degree of skill transference from the laparoscopic to robotic platform. RESULTS: Peg-transfer task completion was consistently faster and more accurate with the robot compared to laparoscopy (p < 0.01). We observed a positive transference of skill from the laparoscopic to robotic platform. However, exposure to the robot-hindered students' ability to perform the task laparoscopically, evidenced by significantly increased time and errors when compared with baseline laparoscopic performance (p < 0.01). CONCLUSION: These findings encourage surgical residency programs to treat robotic and laparoscopic training as discrete entities and consider their unique learning curves and skill transference when designing an efficient curriculum. While these effects are observed in novices, future directions include uncovering the trends among resident trainees and practicing surgeons.

The Importance of General Surgery Residency Program's Online Presence Varies Among Applicant Groups.

INTRODUCTION: The COVID-19 pandemic necessitated an exclusively virtual 2021 residency application cycle. We hypothesized that residency programs' online presence would have increased utility and influence for applicants. METHODS: Substantial surgery residency website modifications were undertaken in the summer of 2020. Page views were gathered by our institution's information technology office for comparison across years and programs. An anonymous, voluntary, online survey was sent to all interviewed applicants for our 2021 general surgery program match. Five-point Likert-scale questions evaluated applicants' perspective on the online experience. RESULTS: Our residency website received 10,650 page views in 2019 and 12,688 in 2020 (P = 0.14). Page views increased with a greater margin compared to a different specialty residency program's (P < 0.01). From 108 interviewees, 75 completed the survey (69.4%). Respondents indicated our website was satisfactory or very satisfactory compared to other programs (83.9%), and none found it unsatisfactory. Applicants overall stated our institution's online presence impacted their decision to interview (51.6%). Programs' online presence impacted the decision to interview for nonWhite applicants (68%) but significantly less for white applicants (31%, P < 0.03). We observed a trend that those with fewer than this cohort's median interviews (17 or less) put more weight on online presence (65%), compared to those with 18 or greater interviews (35%). CONCLUSIONS: Applicants utilized program websites more during the 2021 virtual application cycle; our data show most applicants depend on institutions' websites to supplement their decision-making; however, there are subgroup differences in the influence online presence has on applicant decisions. Efforts to enhance residency webpages and online resources for candidates may positively influence prospective surgical trainees, and especially those underrepresented in medicine, to decide to interview.

A single-center, nonblinded, clinical trial comparing blood pressures before and after tourniquet application in healthy humans: A study protocol.

INTRODUCTION: Cardiac arrest is the leading cause of natural death in the United States, and most surviving patients suffer from neurological dysfunction. Although this is recognized as a problem, there have been very few changes to the cardiopulmonary resuscitation (CPR) procedure. Tourniquets have been recognized for their ability to increase truncal blood pressure and have been shown to improve CPR outcomes in animal models. However, the relationship between tourniquet application and blood pressure elevation has not been adequately explored in healthy human adults. OBJECTIVES: The objective of this study is to demonstrate that bilateral, non-invasive, peripheral vascular occlusion in the thighs results in an increased proximal systolic blood pressure ≥ 10 mmHg. METHODS: This is a single-center, non-blinded clinical trial. Volunteers will be screened for eligibility at least 24 hours before the day of the trial. On the day of the trial, volunteers will undergo an informed consent process. If they choose to participate in the trial after informed consent, their baseline blood pressure will be measured. Volunteers will then have a Combat Application Tourniquet (CAT) applied to each thigh, and the windlasses will be tightened by IRB-approved personnel. Once no pulse can be felt in the lower extremity, blood pressure will be measured in the arm. This will be replicated three times, and the tourniquets will be loosened between trials to allow the volunteers to rest. Any complications that arise during the trial will be handled by the physician that is present. ANALYSIS: Changes in systolic blood pressure and diastolic blood pressure will be analyzed using a Shapiro-Wilk test. Then, a one-way repeated measures analysis of variance (ANOVA) will be performed with a Holm-Sidak post-hoc test to determine the mean differences. The significance level will be set to 5% for statistical significance. REGISTRY AND REGISTRATION NUMBER: Clinicaltrials.gov, NCT05324306.

Extremity tourniquets raise blood pressure and maintain heart rate.

BACKGROUND: Tourniquets have been modified and used for centuries to occlude blood flow to control hemorrhage. More recently, the occlusion of peripheral vessels has been linked to resultant increases in blood pressure, which may provide additional therapeutic potential, particularly during states of low cardiac output. OBJECTIVE: The objective of this study was to investigate a causal relationship between tourniquet application and blood pressure in healthy adults. METHODS: Healthy adult volunteers were recruited to participate in this IRB-approved study. Each participant met inclusion criteria and demonstrated baseline normotension. Brachial cuff blood pressure and heart rate were recorded pre- and post-tourniquet application to the bilateral legs. RESULTS: Twenty-seven adults aged 22 to 35 years participated and were included in analysis. The average systolic blood pressure was 122 ± 7 mmHg, diastolic blood pressure was 72 ± 9 mmHg, and heart rate was 70 ± 13 bpm. Following bilateral tourniquet application over the femoral vasculature, we observed a statistically significant increase in systolic (7 mmHg, p < 0.001) and diastolic (4 mmHg, p = 0.05) blood pressures with no significant change in heart rate (2 bpm, p > 0.05). CONCLUSIONS: The elevations in systolic and diastolic blood pressures establish a dependent relationship between tourniquet application to the lower extremities and blood pressure elevation. These results may support new indications for tourniquet-use or extremity vessel occlusion in settings of hemodynamic instability.

The robot doesn't lie: real-life validation of robotic performance metrics.

BACKGROUND: Degree of resident participation in a case is often used as a surrogate marker for operative autonomy, an essential element of surgical resident training. Previous studies have demonstrated a considerable disagreement between the perceptions of attending surgeons and trainees when it comes to estimating operative participation. The Da Vinci Surgical System dual console interface allows machine generated measurements of trainee's active participation, which has the potential to obviate the need for labor intensive direct observation of surgical procedures. However, the robotic metrics require validation. We present a comparison of operative participation as perceived by the resident, faculty, trained research staff observer (gold standard), and robotic machine generated data. METHODS: A total of 28 consecutive robotic inguinal hernia repair procedures were observed by research staff. Operative time, percent active time for the resident, and number of handoffs between the resident and attending were recorded by trained research staff in the operating room and the Da Vinci Surgical System. Attending and resident evaluations of operative performance and perceptions of percent active time for the resident were collected using standardized forms and compared with the research staff observed values and the robot-generated console data. Wilcoxon two-sample tests and Pearson Correlation coefficients statistical analysis were performed. RESULTS: Robotic inguinal hernia repair cases had a mean operative time of 91.3 (30) minutes and an attending-rated mean difficulty of 3.1 (1.26) out of 5. Residents were recorded to be the active surgeon 71.8% (17.7) of the total case time by research staff. There was a strong correlation (r = 0.77) in number of handoffs between faculty and trainee as recorded by the research staff and robot (4.28 (2.01) vs. 5.8 (3.04) respectively). The robotic machine generated data demonstrated the highest degree of association when compared to the gold standard (research staff observed data), with r = 0.98, p < 0.0001. Lower levels of association were seen with resident reported (r = 0.66) perceptions and faculty-reported (r = 0.55) perceptions of resident active operative time. CONCLUSIONS: Our findings suggest that robot-generated performance metrics are an extremely accurate and reliable measure of intraoperative resident participation indicated by a very strong correlation with the data recorded by research staff's direct observation of the case. Residents demonstrated a more accurate awareness of their degree of participation compared with faculty surgeons. With high accuracy and ease of use, robotic surgical system performance metrics have the potential to be a valuable tool in surgical training and skill assessment.

Peripheral Arterial Compression as a New Adjunct Technique to Cardiopulmonary Resuscitation.

The success of cardiopulmonary resuscitation (CPR) is critically dependent on the maintenance of myocardial and cerebral perfusion; therefore, preferential perfusion of these vital organs over non-vital vascular beds, such as the extremities, is desirable. We propose that compression of the femoral and/or brachial arteries during CPR improves resuscitation outcomes.

Step 1 is Pass/Fail, Now What? Can Clinical Clerkship Grades be Used as a Reliable Metric to Screen General Surgery Residency Applicants?

INTRODUCTION: For decades, the three-digit United States Medical Licensing Exam Step 1 score has been used to competitively evaluate and compare candidates during the residency application process. Starting in 2022, however, all Step 1 scores will be converted to pass/fail. A different quantitative measure will likely gain importance in its stead, one such being clerkship performance grades. This study aims to determine the consistency of class rank and distribution of clerkship grades reported by medical schools for applicants to a general surgery program. METHODS: Candidates' Medical Student Performance Evaluation letters from 141 unique US allopathic medical schools were reviewed for student overall class rank, the number of grading tiers in each clerkship, and the percent achieving honors criteria in each clerkship from the 2020 application cycle. Comparative analysis was performed by region and medical school prestige. RESULTS: Most medical schools rank students using a four-tier system (e.g., fail, pass, high pass, and honors). A third of schools do not provide an overall class rank of students (34.7% of schools); this was most prevalent in the Northeast and Western regions. Schools in the Central US more often rank their students in five tiers compared to the South (P < 0.01). The percent of students that achieve the highest grading tier varies across the core clerkships (mean 37.1%, range 6.5%-78%); an average of 34.5% of students meet the highest honors tier in their Surgery clerkship. Students at US News and World Report Top 20 medical schools are more likely to receive the highest honors tier, across all core clerkships and overall class rank, than students at schools outside the Top 20 (P < 0.05). CONCLUSIONS: In the absence of the United States Medical Licensing Exam Step 1 score, the variability in clerkship grading tiers and overall class rank will likely pose a challenge to residency programs' ability to stratify desirable applicants. Further transparency and standardization may be required to compare students objectively and fairly from medical schools across the country.

Connexins in endothelial cells as a therapeutic target for solid organ transplantation.

Connexins are a class of membrane proteins widely distributed throughout the body and have various functions based on their location and levels of expression. More specifically, connexin proteins expressed in endothelial cells (ECs) have unique roles in maintaining EC barrier integrity and function-a highly regulated process that is critical for pro-inflammatory and pro-coagulant reactions. In this minireview, we discuss the regulatory influence connexin proteins have in maintaining EC barrier integrity and their role in ischemia-reperfusion injury as it relates to organ transplantation. It is evident that certain isoforms of the connexin protein family are uniquely positioned to have far-reaching effects on preserving organ function; however, there is still much to be learned of their roles in transplant immunology and the application of this knowledge to the development of targeted therapeutics.

Hypoxic respiratory failure in acute appendicitis: A bronchoperitoneal fistula as the presenting symptom of appendicitis in the setting of pediatric COVID-19.

Symptomatic COVID-19 less frequently affects the pediatric population and is often associated with atypical presenting symptoms. Here we describe a nine-year-old patient who presented with acute hypoxic respiratory failure and was found to have perforated appendicitis, intra-abdominal abscess, and bronchoperitoneal fistula. The rapid progression of this pathology, complex critical care decision making, and ultimate surgical management has not been previously described. Documenting this patient's clinical course and effective treatments may serve to inform and guide the medical community and pediatric care providers as the world continues to combat the COVID-19 pandemic.

New Developments in T Cell Immunometabolism and Implications for Cancer Immunotherapy.

Despite rapid advances in the field of immunotherapy, the elimination of established tumors has not been achieved. Many promising new treatments such as adoptive cell therapy (ACT) fall short, primarily due to the loss of T cell effector function or the failure of long-term T cell persistence. With the availability of new tools and advancements in technology, our understanding of metabolic processes has increased enormously in the last decade. Redundancy in metabolic pathways and overlapping targets that could address the plasticity and heterogenous phenotypes of various T cell subsets have illuminated the need for understanding immunometabolism in the context of multiple disease states, including cancer immunology. Herein, we discuss the developing field of T cell immunometabolism and its crucial relevance to improving immunotherapeutic approaches. This in-depth review details the metabolic pathways and preferences of the antitumor immune system and the state of various metabolism-targeting therapeutic approaches.

Eosinophils and melanoma: Implications for immunotherapy.

New therapies such as immune checkpoint blockers (ICB) have offered extended survival to patients affected by advanced melanoma. However, ICBs have demonstrated debilitating side effects on the joints, liver, lungs, skin, and gut. Several biomarkers have been identified for their role in predicting which patients better tolerate ICBs. Still, these biomarkers are limited by immunologic and genetic heterogeneity and the complexity of translation into clinical practice. Recent observational studies have suggested eosinophil counts, and serum levels of eosinophil cationic protein are significantly associated with prolonged survival in advanced-stage melanoma. It is likely that eosinophils thereby modulate treatment response through mechanisms yet to be explored. Here, we review the functionality of eosinophils, their oncogenic role in melanoma and discuss how these mechanisms may influence patient response to ICBs and their implications in clinical practice.

The Perioperative Patient Experience During COVID-19.

BACKGROUND: Access to elective surgical procedures has been impacted by the COVID-19 pandemic. METHODS: We sought to understand the patient experience by developing and distributing an anonymous online survey to those who underwent non-emergency surgery at a large academic tertiary medical center between March and October 2020. RESULTS: The survey was completed by 184 patients; the majority were white (84%), female (74.6%), and ranged from 18 to 88 years old. Patients were likely unaware of case delay as only 23.6% reported a delay, 82% of which agreed with that decision. Conversely, 44% felt that the delay negatively impacted their quality of life. Overall, 82.7% of patients indicated high satisfaction with their care. African American patients more often indicated a "neutral" vs "satisfactory" hospital experience (P < .05) and considered postponing their surgery (P < .01). Interestingly, younger patients (<60) were more likely than older (≥60) patients to note anxiety associated with having surgery during the pandemic (P < .01), feeling unprepared for discharge (P < .02), not being allowed visitors (P < .02), and learning about the spread of COVID-19 from health care providers (P < .02). DISCUSSION: These results suggest that patients are resilient and accepting of changes to health care delivery during the current pandemic; however, certain patient populations may have higher levels of anxiety which could be addressed by their care provider. These findings can help inform and guide ongoing and future health care delivery adaptations in response to care disruptions.

General surgery applicants report the impact of virtual interviews on their rank list and match.

Purpose: The transition to an all-virtual application cycle for General Surgery Match 2021 significantly altered interview day and the interactions of applicants with residency programs. We sought to evaluate the impact of a virtual match cycle on applicants' rank list and Match results. Methods: We surveyed applicants who were offered an interview for a categorical general surgery residency position at our institution during the 2021 match season. Voluntary anonymous surveys were sent after the rank list deadline and again after the Match. Results: Out of 108 interviewees, 43 completed the survey (40%). Median age was 26, and 61% of respondents were male and 82% white, which skewed from our diverse interview pool. They completed a median of 17 interviews. 69% felt they had sufficient exposure to make their rank list, and this group reached statistically significant higher confidence in their decisions when compared with those who endorsed not having enough exposure to the residency programs (58% vs 42%, p = 0.02). Applicants cited the most influential interview day factors to be their interview with faculty and the virtual social with residents. Least important was their ability to assess the hospital facility. Among seven different program factors, comradery between faculty and residents (31%) and perceived happiness of the residents (18.6%) were most often selected most influential. Only 56% reported ranking all programs at which they interviewed. After submitting their rank list, 59% of applicants stated they had not visited the city of their top ranked program; however, post-match surveys revealed only 44% matched to a program in a city unknown to them. 57% of applicants stated they reached out to their top choice program with additional questions, but only 47% matched at one of those institutions. Conclusions: Even in the constraints of the virtual interviews, most applicants felt they had sufficient exposure to programs to make their rank list. Applicants were willing to highly rank cities they had never visited and to reach out to programs but were ultimately less successful matching at those programs. Understanding what factors and communications most impact applicants and programs may lead to a more successful Match. Supplementary Information: The online version contains supplementary material available at 10.1007/s44186-022-00071-8.

Devices to enhance organ perfusion during cardiopulmonary resuscitation.

INTRODUCTION: The recommended method of cardiopulmonary resuscitation (CPR) has been closed-chest cardiac compressions, but the development of CPR adjunctive devices has called into question the efficacy and role of these adjunctive devices. In this review, we provide a comprehensive evaluation and discussion on the commercially available noninvasive CPR adjuncts used during out-of-hospital cardiac arrest (OHCA). AREAS COVERED: We review the three most common CPR adjunctive devices: the piston mechanism, the load distributing band, and the impedance threshold device. All three CPR adjunctive devices have preclinical data to support their use during cardiac arrest. In clinical trials, limited data show improvement in survival and neurologic recovery for these devices, and there is insufficient high-level evidence to support their use over manual chest compressions. However, there is a role for them when adequate manual chest compressions are not feasible. EXPERT OPINION: The commercially available CPR adjuncts do not consistently show improved outcomes in the literature. There is still a need for research and development into innovative solutions to improve OHCA survival and neurologic recovery. Efforts focused on increasing the speed of CPR initiation and increasing perfusion to the cerebral and coronary vasculature have the potential to advance resuscitative practices.

Concurrent phyllodes tumor, eccrine carcinoma, and multinodular goiter 20 years after radiotherapy for Hodgkin lymphoma.

This unusual case of concurrent eccrine adenocarcinoma, phyllodes tumor, and multinodular goiter serves to alert the oncologic community to the high prevalence of second cancers after childhood radiotherapy. Increased surveillance and index of suspicion are recommended to successfully diagnose and treat second primary cancers in this vulnerable population.

Redefining the Surgical Council of Resident Education (SCORE) Curriculum: A Comparison with the Operative Experiences of Graduated General Surgical Residents.

Our objective was to investigate the number and classify surgical operations performed by general surgery residents and compare these with the updated Surgical Council on Resident Education (SCORE) curriculum. We performed a retrospective review of logged surgical cases from general surgical residents who completed training at a single center from 2011 to 2015. The logged cases were correlated with the operations extracted from the SCORE curriculum. Hundred and fifty-one procedures were examined; there were 98 "core" and 53 "advanced" cases as determined by the SCORE. Twenty-eight residents graduated with an average of 1017 major cases. Each resident completed 66 (67%) core cases and 17 (32%) advanced cases an average of one or more times with 39 (40%) core cases and 6 (11%) advanced cases completed five or more times. Core procedures that are infrequently or not performed by residents should be identified in each program to focus on resident education.

Selective induction of IL-1ß after a brief isoflurane anesthetic in children undergoing MRI examination.

PURPOSE: To determine if isoflurane anesthesia without surgery causes systemic inflammation in children. Inflammation is targeted as responsible for the development of many neurologic pathologies. The effect will be evaluated by measuring serum cytokine levels before and after isoflurane anesthesia. The possible neurotoxic effect of anesthetic agents is a concern in pediatric anesthesia. Questions remain as to the true effects of anesthesia alone on systemic inflammation. The current study assesses systemic inflammatory response to general anesthesia in children not exposed to surgical stress. METHODS: Twenty-five patients, aged 6 months to 11 years undergoing MRI scanning were recruited. Patients with ASA Physical Status Classification >II, known neurologic disease, prematurity, recent infection, or current treatment with anti-inflammatory medications were excluded. Each patient received a sevoflurane induction, peripheral intravenous catheterization, and laryngeal mask airway placement. Isoflurane was titrated to ensure adequate depth of anesthesia. Two peripheral blood samples were obtained: one immediately after placement of the PIV and one upon arrival to the post-anesthesia care unit. Serum cytokine levels were compared between pre- and post-isoflurane time points using paired t tests. RESULTS: For all patients, interleukin-1ß increased after isoflurane when compared to pre-isoflurane samples (pre = 25.97 ± 9.01, post = 38.53 ± 16.56, p = 0.0002). Serum levels of IL-6 (pre = 2.28 ± 2.27, post = 2.04 ± 2.15, p = 0.146) and tumor necrosis factor-α (pre = 94.26 ± 18.07, post = 85.84 ± 12.12, p = 0.057) were not significantly changed. Interleukin-10 and vascular endothelial growth factor were undetectable in pre- and post-isoflurane samples at a minimum detection threshold of 6.6 and 10 pg/ml, respectively. CONCLUSIONS: A brief (approximately 60 min) exposure to isoflurane general anesthesia, without induced surgical stress, significantly increased serum IL-1ß, a selective activation marker of systemic inflammation (IL-1ß pathway).