Robotic median arcuate ligament release: management algorithm and clinical outcomes from a large minimally invasive series.

BACKGROUND: Median arcuate ligament syndrome (MALS) is a rare and debilitating condition that remains difficult to diagnose. Proper patient selection remains key to achieving favorable outcomes for those undergoing MALR. The robotic technique facilitates a minimally invasive MALR approach given the fine precision of the instrumentation and stability of visualization. Here we describe our management algorithm and clinical outcomes for a large series of robotic MALR patients. METHODS: This retrospective cohort study analyzed adult patients who underwent robotic MALR performed by a single surgeon at a tertiary academic hospital from 2014 to 2021. The diagnosis of MALS was made using objective criteria from celiac artery duplex ultrasound with a peak systolic velocity of > 350 cm/s combined with a right upper quadrant abdominal ultrasound, esophagogastroduodenoscopy, and computer tomography or magnetic resonance angiography to exclude other diagnoses. Information on patient demographics, perioperative factors, and patient reported symptoms up to 1-year post-operatively were collected. RESULTS: A total of 74 patients underwent robotic MALR during the study period. The mean age was 27.3 ± 7.9 years and the majority of patients were female (n = 60/74, 81.1%). The most common presenting symptom was post-prandial abdominal pain (n = 65/74, 87.7%). The mean operative time was 52.6 ± 18.1 min. There were no conversions to open surgery and minimal blood loss (mean = 13.9 ± 8.4 mL). At 3-months, 12% (n = 9/74) of patients had persistent abdominal pain and underwent additional imaging. 5 of these 9 patients had persistently elevated DUS expiratory PSV and were referred for angioplasty. 3 of these 5 referred patients had resolution of abdominal pain after angioplasty. At 1-year follow up, 90.3% (n = 56/62) continued to have no abdominal pain. CONCLUSIONS: Through this series, the largest set of minimally invasive (laparoscopic or robotic) MALR procedures published to date, we show that with strict adherence to a management algorithm, the robotic approach to MALR is safe and feasible, with good patient outcomes.

Different-team procurements: A potential solution for the unintended consequences of change in lung allocation policy.

The new lung allocation policy has led to an increase in distant donors and consequently enhanced logistical burden of procuring organs. Though early single-center studies noted similar outcomes between same-team transplantation (ST, procuring team from transplanting center) and different-team transplantation (DT, procuring team from different center), the efficacy of DT in the contemporary era remains unclear. In this study, we evaluated the trend of DT, rate of transplanting both donor lungs, 1-year graft survival, and risk of Grade 3 primary graft dysfunction (PGD) using the Scientific Registry of Transplant Recipient (SRTR) database from 2006 to 2018. A total of 21619 patients (DT 2085, 9.7%) with 19837 donors were included. Utilization of DT decreased from 15.9% in 2006 to 8.5% in 2018. Proportions of two-lung donors were similar between the groups, and DT had similar 1-year graft survival as ST for both double (DT, HR 1.108, 95% CI 0.894-1.374) and single lung transplants (DT, HR 1.094, 95% CI 0.931-1.286). Risk of Grade 3 PGD was also similar between ST and DT. Given our results, expanding DT may be a feasible option for improving lung procurement efficiency in the current era, particularly in light of the COVID-19 pandemic.

Donor management using a specialized donor care facility is associated with higher organ utilization from drug overdose donors.

Drug overdoses have tripled in the United States over the last two decades. With the increasing demand for donor organs, one potential consequence of the opioid epidemic may be an increase in suitable donor organs. Unfortunately, organs from donors dying of drug overdose have poorer utilization rates than other groups of brain-dead donors, largely due to physician and recipient concerns about viral disease transmission. During the study period of 2011 to 2016, drug overdose donors (DODs) account for an increasingly greater proportion of the national donor pool. We show that a novel model of donor care, known as specialized donor care facility (SDCF), is associated with an increase in organ utilization from DODs compared to the conventional model of hospital-based donor care. This is likely related to the close relationship of the SDCF with the transplant centers, leading to improved communication and highly efficient donor care.

Favorable peri-operative outcomes observed in paraesophageal hernia repair with robotic approach.

BACKGROUND: The robotic surgical approach offers enhanced visualization, dexterity and reach, which may facilitate the more technically demanding portions of paraesophageal hernia (PEH) repair such as hiatal reconstruction and mediastinal dissection. We sought to compare the peri-operative clinical outcomes of the laparoscopic vs. robotic approach to PEH repair. METHODS: A prospective, IRB-approved database was maintained for all robotic PEH repairs performed by a single surgeon at a tertiary academic hospital from 2009 to 2019. A retrospective review of laparoscopic PEH over this same time period was used as a comparison group. Outcome measures included: operative time, conversion to open, need for an esophageal lengthening procedure, operative equipment costs and length of stay (LOS). RESULTS: 1854 patients underwent PEH repair during this time period (830 robotic; 1024 laparoscopic). Demographics of both groups were similar, including BMI and PEH type, although a higher proportion of robotic cases were re-operative PEH repairs (32.5% vs 24.0%; p < 0.001). Patients who underwent a robotic PEH had a significant reduction in esophageal lengthening procedures performed (0.1% vs. 11.0%; p < 0.001), conversion to open (0% vs. 7.0%; p < 0.001), and LOS (1.8 days vs. 3.1 days; p < 0.001). Intra-operative equipment costs were similar. CONCLUSIONS: In one of the largest robotic PEH case series reported to date, there were significant improvements in peri-operative outcomes in patients undergoing a robotic-assisted approach. Although a greater number of patients in the robotic group were redo PEH repairs, when compared to the laparoscopic group, there were no conversions to open and significantly fewer esophageal lengthening procedures, both of which carry significant morbidity. The similar intra-operative costs were likely balanced by the higher costs associated with stapling equipment and conversions in the laparoscopic group. Our findings show that the robotic PEH repair is safe and can result in improved peri-operative outcomes.

Comparison of precision and speed in laparoscopic and robot-assisted surgical task performance.

BACKGROUND: Robotic platforms have the potential advantage of providing additional dexterity and precision to surgeons while performing complex laparoscopic tasks, especially for those in training. Few quantitative evaluations of surgical task performance comparing laparoscopic and robotic platforms among surgeons of varying experience levels have been done. We compared measures of quality and efficiency of Fundamentals of Laparoscopic Surgery task performance on these platforms in novices and experienced laparoscopic and robotic surgeons. METHODS: Fourteen novices, 12 expert laparoscopic surgeons (>100 laparoscopic procedures performed, no robotics experience), and five expert robotic surgeons (>25 robotic procedures performed) performed three Fundamentals of Laparoscopic Surgery tasks on both laparoscopic and robotic platforms: peg transfer (PT), pattern cutting (PC), and intracorporeal suturing. All tasks were repeated three times by each subject on each platform in a randomized order. Mean completion times and mean errors per trial (EPT) were calculated for each task on both platforms. Results were compared using Student's t-test (P < 0.05 considered statistically significant). RESULTS: Among novices, greater errors were noted during laparoscopic PC (Lap 2.21 versus Robot 0.88 EPT, P < 0.001). Among expert laparoscopists, greater errors were noted during laparoscopic PT compared with robotic (PT: Lap 0.14 versus Robot 0.00 EPT, P = 0.04). Among expert robotic surgeons, greater errors were noted during laparoscopic PC compared with robotic (Lap 0.80 versus Robot 0.13 EPT, P = 0.02). Among expert laparoscopists, task performance was slower on the robotic platform compared with laparoscopy. In comparisons of expert laparoscopists performing tasks on the laparoscopic platform and expert robotic surgeons performing tasks on the robotic platform, expert robotic surgeons demonstrated fewer errors during the PC task (P = 0.009). CONCLUSIONS: Robotic assistance provided a reduction in errors at all experience levels for some laparoscopic tasks, but no benefit in the speed of task performance. Robotic assistance may provide some benefit in precision of surgical task performance.

Capturing and Improving Case Charge Accuracy in Robotic Surgery Programs.

SUMMARY: The robotic platform offers many benefits to patients and surgeons; however, incorporating this new surgical tool has also introduced challenges in intraoperative documentation accuracy. In 2019, we began to investigate our institution's robotic intraoperative supply documentation accuracy. We identified a 60% case error rate between the robotic items logged by the operating room staff in the electronic medical record and the true robotic items used for a case as logged on the Intuitive platform. This can be a widespread and unrecognized problem for other organizations as well. We then addressed this problem through patient safety and quality improvement-based interventions including error notification to operating room personnel, a barcode scanning system, peer-to-peer education, improving robotic item descriptions, and procedure receipt messaging. These interventions helped us decrease our institution's case error rate from 60% to 16.9% during the past 2 years, which generated a cumulative 2.1% net increase in our billed robotic items, through the addition and/or subtraction of robotic items from each case. Through our multiple interventions, we have created a robust, flexible, and efficient item-capturing system for robotic surgery cases.

The epidemiology and biology of pulmonary metastases.

Our goal in this chapter is to explore the complex processes of metastasis and why there is a predisposition for this to occur in the lung. In addition, we aim to describe the incidence of pulmonary metastases in various contexts and based on the origin of the primary tumor. There are unique characteristics of the pulmonary system that make metastases more likely to occur in the lung than anywhere else in the body. Some of these characteristics include receiving the entire cardiac output every minute, having the densest capillary bed in the body, and being the first reservoir of most lymphatic drainage entering the venous system. There are multiple postulated routes of metastasis to the pulmonary system including hematogenous and lymphatic routes with early or late dissemination. The vascularization of pulmonary metastases is variable and complex, often recruiting supply from bronchial and pulmonary origin. There are also many biochemical factors in the tumor microenvironment that play a key role in the development of lung metastases including vascular endothelial growth factor (VEGF), interleukin-8 (IL-8), very late antigen 4 (VLA-4) and intercellular adhesion molecule 1 (ICAM-1). Studies vary widely in reported rates of pulmonary metastases due to differences in clinical study design, however, it is commonly accepted that up to half of autopsies performed on patients who died of malignancy have pulmonary metastases. In a surgical series describing the incidence of primary cancer types with resected pulmonary metastases the most common sites were thyroid, colon, breast, genitourinary tract, skin, liver, breast, and adrenal glands.

Local versus distant lung donor procurement does not influence short-term clinical outcomes.

OBJECTIVE: The purpose of this study was to recognize clinically meaningful differences in lung transplant outcomes based on local or distant lung procurement. This could identify if the lung allocation policy change would influence patient outcomes. METHODS: This single-center retrospective cohort study analyzed adult patients who underwent lung transplant from 2006 to 2017. Donor and recipient data were abstracted from a collaborative, prospective registry shared by our local organ procurement organization, and tertiary medical center. Short-term outcomes, 1-year survival, and hospitalization costs were compared between local and distant lung transplants defined by donor service area. RESULTS: Of the 722 lung transplants performed, 392 (54%) had local donors and 330 (46%) had distant donors. Donors were similar in age and cause of death. Recipients were significantly different in diagnosis and local recipients had lower median lung allocation scores (local, 37.3 and distant, 44.9; P < .01). Distant lung transplants had longer total ischemic times (local, 231 ± 52 minutes and distant, 313 ± 48 minutes; P < .01). The rate of major complications, length of hospital stay, and 1-year survival were similar between groups. Distant lung transplants were associated with higher median overall cost (local, $183,542 and distant, $229,871; P < .01). Local lung transplants were more likely to be performed during daytime (local, 333 out of 392 [85%] and distant, 291 out of 330 [61%]; P < .01). CONCLUSIONS: Local lung transplants are associated with shorter ischemic times, lower cost, and greater likelihood of daytime surgery. Short- and intermediate-term outcomes are similar for lung transplants from local and distant donors. The new lung allocation policy, with higher proportion of distant lung transplants, is likely to incur greater costs but provide similar outcomes.

Impact of Nighttime Lung Transplantation on Outcomes and Costs.

BACKGROUND: Previous studies in the field of organ transplantation have shown a possible association between nighttime surgery and adverse outcomes. We aim to determine the impact of nighttime lung transplantation on postoperative outcomes, long-term survival, and overall cost. METHODS: We performed a single-center retrospective cohort analysis of adult lung transplant recipients who underwent transplantation between January 2006 and December 2017. Data were extracted from our institutional Lung Transplant Registry and Mid-America Transplant services database. Patients were classified into 2 strata, daytime (5 AM to 6 PM) and nighttime (6 PM to 5 AM), based on time of incision. Major postoperative adverse events, 5-year overall survival, and 5-year bronchiolitis obliterans syndrome-free survival were examined after propensity score matching. Additionally we compared overall cost of transplantation between nighttime and daytime groups. RESULTS: Of the 740 patients included in this study, 549 (74.2%) underwent daytime transplantation and 191 (25.8%) underwent nighttime transplantation (NT). Propensity score matching yielded 187 matched pairs. NT was associated with a higher risk of having any major postoperative adverse event (adjusted odds ratio, 1.731; 95% confidence interval, 1.093-2.741; P = .019), decreased 5-year overall survival (adjusted hazard ratio, 1.798; 95% confidence interval, 1.079-2.995; P = .024), and decreased 5-year bronchiolitis obliterans syndrome-free survival (adjusted hazard ratio, 1.556; 95% confidence interval, 1.098-2.205; P = .013) in doubly robust multivariable analyses after propensity score matching. Overall cost for NT and daytime transplantation was similar. CONCLUSIONS: NT was associated with a higher risk of major postoperative adverse events, decreased 5-year overall survival, and decreased 5-year bronchiolitis obliterans syndrome-free survival. Our findings suggest potential benefits of delaying NT to daytime transplantation.

Robotic Approach to Paraesophageal Hernia Repair Results in Low Long-Term Recurrence Rate and Beneficial Patient-Centered Outcomes.

BACKGROUND: Little is known regarding important long-term outcomes after robotic paraesophageal hernia (PEH) repairs, such as symptom relief and recurrence rates. The aim of this study was to evaluate the long-term clinical outcomes in a large series of patients undergoing robotic PEH repair. STUDY DESIGN: This prospective, IRB-approved study analyzed adult patients who underwent robotic PEH repair, from 2010 to 2014, at a high-volume tertiary academic medical center. Detailed information on patient characteristics, perioperative factors, and long-term patient-reported outcomes for up to 5 years postoperatively were collected. Objective long-term outcomes included radiographic evidence of PEH recurrence at 1, 3, and 5 years postoperatively. RESULTS: A total of 233 patients underwent robotic PEH repair during the study period-70% were primary, 30% were revisional. Seventy-eight percent of patients (181) had a type III PEH, 21% (49) had a type IV, and 1% (3) had a type II. At 5 years postoperatively, 62% of patients (145 of 233) were available for follow-up, with a radiographic recurrence rate of 9% (13 of 145). Additionally, there was a significant improvement in the GERD-HRQL score at 5 years postoperatively (preoperative: 25.6 ± 8.7, 5-year postoperative, 4.5 ± 1.7, p < 0.01, 95% CI 19.7 to 22.5). CONCLUSIONS: This study represents one of the largest longitudinal robotic foregut surgical databases to date. Our results demonstrate that robotic PEH repair with an experienced surgical team is a safe and effective alternative to laparoscopic repair, with excellent long-term outcomes, including a very low recurrence rate.

Performance of Pediatric PROMIS CATs in Children With Upper Extremity Fractures.

Background: This study was designed to quantify the performance of the pediatric Patient-Reported Outcome Measurement Information System (PROMIS) when delivered as part of routine care to children with upper extremity (UE) fractures. Methods: This cross-sectional study analyzed 964 new pediatric patients presenting with an UE fracture. All patients completed PROMIS computer adaptive tests for pain interference, peer relationships, UE function, and mobility domains at clinic registration. PROMIS was completed by parent-proxy (n = 418) for 5- to 7-year-olds and self-reported by 8- to 10-year-olds (n = 546). PROMIS score distributions were defined, and Pearson correlations assessed the interrelation between PROMIS domains. Student's t tests compared mean PROMIS scores between parent-proxy and self-completion groups. Results: UE scores indicated the greatest average impairment of all PROMIS domains. However, 13% of patients reached the UE score ceiling indicating maximal UE function. UE scores and mobility scores had a strong positive correlation while UE scores had a moderate negative correlation with pain interference. In all patients, peer relationships were, at most, very weakly correlated with any other PROMIS domain. After grouping by fracture type, parent-proxy completion estimated worse UE function, more pain interference, and worse peer relationship. Conclusions: Pediatric PROMIS UE function scores capture impairment from UE fractures but do have a strong positive correlation with pediatric PROMIS Mobility, which assesses lower extremity function. Among children with UE fractures, parent-proxy completion of pediatric PROMIS appears associated with worse scores on most PROMIS domains.

Shipping Lungs Greater Distances Increases Costs Without Cutting Waitlist Mortality.

BACKGROUND: On November 24, 2017, a change in lung allocation policy was initiated to replace the donor service area with a 250-nautical-mile radius circle around the donor hospital. We aim to analyze the consequences of this change, including organ acquisition cost and transplant outcomes, at the national level. METHODS: Data on adult patients undergoing lung transplantation between April 27, 2017, and June 22, 2018 (30 weeks before to 30 weeks after allocation policy change) were extracted from the Scientific Registry of Transplant Recipients database. Patients were classified into pre-change and post-change subgroups. Six-month overall survival was evaluated by Kaplan-Meier analysis. Organ acquisition costs were compared between the pre-change and post-change groups. RESULTS: Of the 3317 adult patients removed from the waiting list during the study period (pre-change 1637 vs post-change 1680), 2734 underwent transplantation (pre-change 1371 of 1637 [83.8%] vs post-change 1363 of 1680 [81.1%]), and 382 died or became too sick to be transplanted (pre-change 168 of 1637 [10.3%] vs post-change 214 of 1680 [12.7%], P = .077). Six-month survival rates of transplanted patients were similar between the two groups. However, average organ acquisition costs increased after policy change (pre-change $50,735 ± $10,858 vs post-change $53,440 ± $10,247, P < .001) with an increase in nonlocal donors (pre-change 44.3% vs post-change 68.9%, P < .001). CONCLUSIONS: Organ acquisition costs and resource utilization increased with the new lung allocation policy, whereas deaths on the waiting list or after transplantation did not decrease. Further optimization of the allocation policy is necessary to balance access to transplant and proper stewardship of human and financial resources.

Effect of Patient Body Mass Index on Laparoscopic Surgical Ergonomics.

BACKGROUND: Minimally invasive surgery may introduce new ergonomic challenges for surgeons. Increased patient body mass index (BMI) may further add to this ergonomic stress. OBJECTIVES: The objective of this study was to quantify the ergonomic impact of patient BMI on surgeons during laparoscopic surgery. SETTING: University Hospital, USA. METHODS: This prospective cohort study analyzed five minimally invasive surgeons during 24 laparoscopic procedures. Each subject's muscle stress was assessed by recording surface electromyography (EMG) data from eight upper body muscle groups during laparoscopic procedures. EMG data was normalized against the maximal voluntary contraction (MVC) of each muscle measured before the start of surgery to create a percentage of the MVC value (%MVC). Subject workload was assessed through the NASA Task Load Index (NTLX). Statistical analysis was used to determine significance between surgeons operating on patients with or without obesity for %MVC and NTLX scores. RESULTS: There was no significant difference (p > 0.05) in both the average muscle activation of all eight muscle groups and NTLX scores during laparoscopic surgery in surgeons operating on patients with BMI > = 30 compared with patients with a BMI < 30. CONCLUSIONS: We detected no differences in ergonomic stress or workload for surgeons operating on patients with or without obesity. For surgeons, the laparoscopic approach may offer an additional advantage over open surgery in patients with obesity. This advantage may be due to an "equalizing effect" of laparoscopy-that surgical ergonomics are less affected by the BMI of the patient when using laparoscopic tools.