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28 February 2020 : Clinical Research  

Cumulative Sum Analysis of the Operator Learning Curve for Robot-Assisted Mayo Clinic Level I–IV Inferior Vena Cava Thrombectomy Associated with Renal Carcinoma: A Study of 120 Cases at a Single Center

Donglai Shen1ABCDEF, Hanfeng Wang1ACDE, Chenfeng Wang1BCF, Qingbo Huang1BCD, Shichao Li1DF, Shengpan Wu1BF, Yundong Xuan1CD, Huijie Gong2BC, Hongzhao Li1BDF, Xin Ma1BCD, Baojun Wang1ADEF, Xu Zhang1ACDE*

DOI: 10.12659/MSM.922987

Med Sci Monit 2020; 26:e922987

Abstract

BACKGROUND: This study aimed to use cumulative sum analysis of the operator learning curve for robot-assisted Mayo Clinic level I–IV inferior vena cava (IVC) thrombectomy associated with renal carcinoma, and describes the development of an optimized operative procedure at a single center.

MATERIAL AND METHODS: A retrospective study included 120 patients with Mayo Clinic level I–IV IVC thrombus who underwent robotic surgery between 2013 and 2018. Points in the learning curve were identified using cumulative sum analysis, and their impact was assessed by multiple regression analysis. Perioperative indicators analyzed included operative time, estimated blood loss, early complications, and the 90-day progression rate.

RESULTS: Cumulative sum analysis identified three phases in the learning curve of robot-assisted IVC thrombectomy. The median operative time decreased from 265 min (range, 212–401 min) to 207 min (range, 146–276 min) (p=0.003), the median estimated blood loss decreased from 775 ml (range, 413–1500 ml) to 300 ml (range, 163–813 ml) (p=0.006), and the early complication rate decreased from 52.5% to 15.0% (p<0.001). Multivariate analysis showed that for an initial 40 cases and a further 80 cases, the learning phase, the affected side, the Mayo Clinic level, and the surgical method were independent factors that affected operative time, estimated blood loss, and the rate of early complications.

CONCLUSIONS: Experience from an initial 40 cases and a further 80 cases of Mayo Clinic level I–IV IVC thrombectomy associated with renal carcinoma were found to provide acceptable surgical and clinical outcomes.

Keywords: Carcinoma, Renal Cell, learning curve, Robotics, Thrombectomy, Vena Cava, Inferior, Blood Loss, Surgical, Kidney Neoplasms, Neoplastic Cells, Circulating, Nephrectomy, operative time, Robotic Surgical Procedures, Venous Thrombosis

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750