Prospective comparative study of postoperative systemic inflammatory syndrome in robot-assisted vs. open kidney transplantation

Robot-assisted Kidney Transplantation: The 8-year European Experience

BACKGROUND AND OBJECTIVE

Evidence regarding perioperative results and long-term functional outcomes of robotic-assisted kidney transplantation (RAKT) is limited. We evaluated perioperative surgical results and long-term functional outcomes of RAKT in patients receiving kidney transplants from living donors.

METHODS

This retrospective analysis is based on a prospective multicenter cohort study conducted from July 2015 to October 2023 across ten European centers. A total of 624 patients who underwent heterotopic RAKT from living donors were included, excluding those who received orthotopic RAKT. The primary outcomes measured were long-term renal function, perioperative complications, and survival rates. Renal function was assessed with the estimated glomerular filtration rate (eGFR). The Clavien-Dindo classification (CDC) was used to describe early (within 30 d) and late (from 31 to 90 d) postoperative complications. The probabilities of dialysis, graft nephrectomies, and any-cause mortality during follow-up were reported in terms of the 5-yr cumulative incidence.

KEY FINDINGS AND LIMITATIONS

A total of 624 patients with a median age of 35 yr (interquartile range [IQR]: 26-52) underwent RAKT. Preemptive RAKT was performed in 52% of cases, and the majority (84%) had the transplant in the right iliac fossa. The median operative time was 210 min (IQR: 180-262), with a rewarming time of 43 min (IQR: 38-50). Intraoperative complications were rare (1.1%), and postoperative graft nephrectomy occurred in 1.9% of patients. High-grade (CDC grade ≥3) early and late postoperative complications were observed in 7.7% and 2.3% of patients, respectively. Rates of incisional hernias, ureteral stenosis, and arterial stenosis were 1.4%, 1.1%, and 0.2%, respectively. The median eGFR values were 19, 52, and 53 ml/min/1.73 m2 on the 1st postoperative day, on the 7th postoperative day, and at 6 mo, respectively. Over a median follow-up of 23 mo (IQR: 6-49), 17 patients received dialysis, 11 patients underwent graft nephrectomy, and four patients died. None of the deaths were due to RAKT. The main limitation is the absence of a comparator group.

CONCLUSIONS AND CLINICAL IMPLICATIONS

With the largest experience worldwide on RAKT, we confirm the perioperative safety and excellent long-term functional outcomes of this procedure. Given the benefits of a minimally invasive robotic approach, these findings support the broader adoption of RAKT as a viable option for kidney transplantation.

Robotic kidney transplantation

Kidney transplantation is the best treatment option for patients with end-stage renal disease owing to improved survival and quality of life compared with dialysis. The surgical approach to kidney transplantation has been somewhat stagnant in the past 50 years, with the open approach being the only available option. In this scenario, evidence of reduced surgery-related morbidity after the introduction of robotics into several surgical fields has induced surgeons to consider robot-assisted kidney transplantation (RAKT) as an alternative approach to these fragile and immunocompromised patients. Since 2014, when the RAKT technique was standardized thanks to the pioneering collaboration between the Vattikuti Urology Institute and the Medanta hospital (Vattikuti Urology Institute-Medanta), several centres worldwide implemented RAKT programmes, providing interesting results regarding the safety and feasibility of this procedure. However, RAKT is still considered an alternative procedure to be offered mainly in the living donor setting, owing to various possible drawbacks such as prolonged rewarming time, demanding learning curve, and difficulties in carrying out this procedure in challenging scenarios (such as patients with obesity, severe atherosclerosis of the iliac vessels, deceased donor setting, or paediatric recipients). Nevertheless, the refinement of robotic platforms through the implementation of novel technologies as well as the encouraging results from multicentre collaborations under the umbrella of the European Association of Urology Robotic Urology Section are currently expanding the boundaries of RAKT, making this surgical procedure a real alternative to the open approach.

Access to robotic assisted kidney transplant for recipients: a systematic review and call for reporting standards

Robot-assisted kidney transplantation (RAKT) is a relatively novel, minimally invasive option for kidney transplantation. However, clarity on recipient selection in the published literature is lacking thereby significantly limiting interpretation of safety and other outcomes. This systematic review aimed to identify and synthesize the data on selection of RAKT recipients, compare the synthesized data to kidney transplant recipients across the USA, and explore geographical clusters of availability of RAKT. Systematic literature review, in accordance with PRISMA, via OVID MEDLINE, Embase, and Web of science from inception to March 5, 2023. All data entry double blinded and quality via Newcastle Ottawa Scale. 44 full-text articles included, encompassing approximately 2402 kidney transplant recipients at baseline but with considerable suspicion for overlap across publications. There were significant omissions of information across studies on patient selection for RAKT and/or analysis. Overall, the quality of studies was very low. Given suspicion of overlap across studies, it is difficult to determine how many RAKT recipients received living (LD) versus deceased donor (DD) organs, but a rough estimate suggests 89% received LD. While the current RAKT literature provides preliminary evidence on safety, there are significant omissions in reporting on patient selection for RAKT which limits interpretation of findings. Two recommendations: (1) international consensus is needed for reporting guidelines when publishing RAKT data and (2) larger controlled trials consistently reporting recipient characteristics are needed to clearly determine selection, safety, and outcomes across both LD and DD recipients.

Does obesity really affect renal transplantation outcomes?

INTRODUCTION

Kidney transplantation is the treatment of choice for patients with stage 5 chronic kidney disease (CKD). About 60% of CKD patients are overweight or obese at the time of kidney transplantation, and post-transplant obesity occurs in 50% of patients, with a weight gain of 10% in the first year and high risk of cardiovascular mortality. Obesity is associated with an increased risk of delayed graft function (DGF), acute rejection, surgical complications, graft loss and mortality. The aim of this study is to assess the clinical evolution of obese and overweight patients that have received a kidney transplant, based on short- and long-term complications associated with a higher BMI.

MATERIAL AND METHODS

A descriptive, observational, cross-sectional study was conducted with 104 kidney or pancreas-kidney transplant patients between March 2017 and December 2020, with a follow-up until April 2021. For comparative analysis, patients were grouped according to BMI.

RESULTS

Mean age was of 56.65 years, 60.6% male and 39.4 % female. Overweight patients experienced prolonged surgeries, more surgical wound dehiscence, delayed graft function, hernias, proteinuria and more indications for renal biopsies. Additionally, obese patients displayed more DGF, indications for renal biopsies, proteinuria, development of diabetes mellitus, atrial fibrillation and needed prolonged hospital stays.

CONCLUSIONS

Despite a high prevalence of comorbidity in the overweight and/or obese population, we found no reduction in patient and/or graft survival. However, longer follow-up is needed.

Open versus robotic-assisted kidney transplantation: A systematic review by the European Association of Urology (EAU) - Young Academic Urologists (YAU) Kidney Transplant Working Group

INTRODUCTION

In the last 20 years, robotic assisted procedures were evaluated in the field of kidney transplantation to provide a mini-invasive approach for this particularly fragile population. As a relatively new issue, few studies compared open kidney transplantation (OKT) and robotic-assisted kidney transplantation (RAKT), mostly in small cohorts. To improve current knowledge, we wanted here to gather comparative data of OKT vs RAKT in a systematic review.

METHODS

A systematic review was performed according to preferred reporting items for systematic reviews and meta-analyses. Medline, Embase, and Cochrane databases were searched to identify all studies reporting post-operative outcomes of RAKT versus OKT.

RESULTS

A total of 2136 patients in 13 studies were included. Median recipient age was 42.6 years (OKT: 43.5 years and RAKT: 40.3 years). Median preemptive kidney transplantation rate was 27.1 % (OKT: 23.3 % and RAKT: 33.2 %). Median total operative time and rewarming were respectively: 235 and 49 min in OKT population; 250 and 60 min in RAKT population. Post-operative complications rates were: 26.2 % in OKT population and 17.8 % in RAKT population. Delayed graft function rates were: 4.9 % in OKT population and 2.3 in RAKT population. Mid-term functional outcomes, patient and graft survival were similar in OKT and RAKT population.

CONCLUSION

This systematic review showed that RAKT may be associated with a lower incidence of delayed graft function and post-operative surgical complications and similar mid-term functional outcomes, patient and graft survival, compared to OKT for end-stage renal disease patients.