Assessment of pulmonary vascular anatomy: comparing augmented reality by holograms versus standard CT images/reconstructions using surgical findings as reference standard.

BACKGROUND: We compared computed tomography (CT) images and holograms (HG) to assess the number of arteries of the lung lobes undergoing lobectomy and assessed easiness in interpretation by radiologists and thoracic surgeons with both techniques. METHODS: Patients scheduled for lobectomy for lung cancer were prospectively included and underwent CT for staging. A patient-specific three-dimensional model was generated and visualized in an augmented reality setting. One radiologist and one thoracic surgeon evaluated CT images and holograms to count lobar arteries, having as reference standard the number of arteries recorded at surgery. The easiness of vessel identification was graded according to a Likert scale. Wilcoxon signed-rank test and κ statistics were used. RESULTS: Fifty-two patients were prospectively included. The two doctors detected the same number of arteries in 44/52 images (85%) and in 51/52 holograms (98%). The mean difference between the number of artery branches detected by surgery and CT images was 0.31 ± 0.98, whereas it was 0.09 ± 0.37 between surgery and HGs (p = 0.433). In particular, the mean difference in the number of arteries detected in the upper lobes was 0.67 ± 1.08 between surgery and CT images and 0.17 ± 0.46 between surgery and holograms (p = 0.029). Both radiologist and surgeon showed a higher agreement for holograms (κ = 0.99) than for CT (κ = 0.81) and found holograms easier to evaluate than CTs (p < 0.001). CONCLUSIONS: Augmented reality by holograms is an effective tool for preoperative vascular anatomy assessment of lungs, especially when evaluating the upper lobes, more prone to anatomical variations. TRIAL REGISTRATION: ClinicalTrials.gov, NCT04227444 RELEVANCE STATEMENT: Preoperative evaluation of the lung lobe arteries through augmented reality may help the thoracic surgeons to carefully plan a lobectomy, thus contributing to optimize patients' outcomes. KEY POINTS: • Preoperative assessment of the lung arteries may help surgical planning. • Lung artery detection by augmented reality was more accurate than that by CT images, particularly for the upper lobes. • The assessment of the lung arterial vessels was easier by using holograms than CT images.

The role of the surgical volume for clinical outcomes in VATS lobectomy for lung cancer: a national large database multicenter analysis.

Improving the quality of lung cancer care at a cost that can be sustained is a hotly debated issue. High-risk, low-volume procedures (such as lung resections) are believed to improve significantly when centralised in high-volume centres. However, limited evidence exists to support volume requirements in lung cancer surgery. On the other hand, there was no evidence that the number of lung resections affected either the short-term perioperative results or the long-term cost. Using data from an extensive nationwide registry, this study investigated the correlations between surgical volumes and selected perioperative outcomes. A retrospective analysis of a prospectively filled national registry that follows stringent quality assurance and security procedures was conducted to ensure data accuracy and security. Patients who underwent VATS lobectomy from 2014 to 2019 at the participating centres were included. Selected perioperative outcomes were reported. Total direct hospital cost is measured at discharge for hospitalisations with a primary diagnosis of lung cancer, hospital stay costs, and postoperative length of hospital stay after lobectomy. After the propensity score matched, centres were divided into three groups according to the surgical volume of the unit where VATS lobectomies were performed (high-volume centre: > 500 lobectomies; medium-volume centre: 200-500 lobectomies; low-volume centre: < 200 lobectomies). 11,347 patients were included and matched (low-volume center = 2890; medium-volume center = 3147; high-volume center = 2907). The mean operative time density plot (Fig. 1A) showed no statistically significant difference (p = 0.67). In contrast, the density plot of the harvested lymph nodes (Fig. 1B) showed significantly higher values in the high-volume centres (p = 0.045), albeit without being clinically significant. The adjusted rates of any and significant complications were higher in the low-volume centre (p = 0.034) without significantly affecting the length of hospital stay (p = 0.57). VATS lobectomies for lung cancer in higher-volume centres seem associated with a statistically significantly higher number of harvested lymph nodes and lower perioperative complications, yet without any significant impact in terms of costs and resource consumption. These findings may advise the investigation of the learning curve effect in a complete economic evaluation of VATS lobectomy in lung cancer. Fig. 1 The mean operative time density plot showed no statistically significant difference (p = 0.67).

Assessment of Quality Outcomes and Learning Curve for Robot-Assisted Minimally Invasive McKeown Esophagectomy.

BACKGROUND: This study aimed to identify the results of the quality assessment and the learning curve of robot-assisted minimally invasive McKeown esophagectomy (RAMIE-MK). METHODS: The study retrospectively reviewed the data of 400 consecutive patients with esophageal cancer who underwent RAMIE-MK by a single surgeon from November 2015 to March 2019. Cumulative summation analysis of the learning curve was performed. The patients were divided into decile cohorts of 40 cases to minimize demographic deviations and to maximize the power of detecting statistically significant changes in performance. RESULTS: The 90-day mortality rate for all the patients was 0.5% (2 cases). The authors' experience was divided into the ascending phase (40 cases), the plateau phase (175 cases), and the descending phase (185 cases). After 40 cases, significant improvements in operative time (328 vs. 251 min; P = 0.019), estimated blood loss (350 vs. 200 ml; P = 0.031), and conversion rates (12.5% vs. 2.5%; P < 0.001) were observed. After 80 cases, a decrease in the rates of anastomotic leakage (22.5% vs. 8.1%; P = 0.001) and vocal cord palsy (31.3% vs. 18.4%; P = 0.024) was observed. The number of harvested lymph nodes increased after 40 cases (13 vs. 23; P < 0.001), especially for lymph nodes along the recurrent laryngeal nerve (3.0 vs. 6.0; P < 0.001). CONCLUSIONS: The learning phase of RAMIE-MK consists of 40 cases, and quality outcomes can be improved after 80 procedures. Several turning points related to the optimization of surgical outcomes can be used as benchmarks for surgeons performing RAMIE-MK.

Chest wall resection and reconstruction for locally recurrent breast cancer: From technical aspects to biological assessment.

INTRODUCTION: Breast cancer is the leading cause of cancer death among women in the industrialized countries. The incidence of local recurrences after mastectomy and breast-conserving therapy varies between 5% and 40% depending on risk factors and primary therapy. METHODS: From April 1999 to April 2011, 40 patients underwent chest wall resection and reconstruction for locally recurrent breast carcinoma with chest wall invasion. The main goal of surgery was local disease control to palliate clinical symptoms. RESULTS: Local radical resection was achieved in 26 patients (65%). One, 2 and 5 year overall survival rates were 94.4%, 82.0% and 68.5%; 1, 2 and 5 year disease-free survival rates were 94.4%, 73.6% and 45.5% respectively. Univariate analysis indicated age (p = 0.002) and synchronous distant metastases (p = 0.020) as factors having a negative impact on overall survival; multivariate analysis disclosed age (p = 0.052) and synchronous metastases (p = 0.059) as factors with a slight negative impact on overall survival. Older age was associated with improved overall survival. Univariate analysis indicated synchronous distant metastases (p = 0.029) and the need of post resectional additional treatments (p = 0.022) as factors adversely conditioning disease-free survival or time to progression; multivariate analysis disclosed the need of post resectional additional treatments (p = 0.036) as the only factor adversely conditioning disease-free survival or time to progression. CONCLUSIONS: Chest wall resection and reconstruction for locally recurrent breast cancer is a feasible and safe procedure providing adequate local disease control and an excellent palliation of very disabling symptoms in a selected group of patients.