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Volume: 18 Issue: 1 January 2020 - Supplement - 1

FULL TEXT

Technical Challenges and Innovations in Kidney Transplantation: Experience With Over 5000 Cases

Kidney transplant has been the standard-of-care treatment for patients with end-stage renal disease for many years. To expand the acceptance and care of complicated situations in patients with end-stage renal disease, transplant teams should be ready to find innovative solutions to prevent and manage pretransplant, intraoperative, and posttransplant problems. In this report, we present our approach for the following scenarios: transplant in patients with urinary diversion and augmentation, polycystic disease in recipients, tumors in transplanted kidney and native kidneys, and the roles of laparoscopy and mini-laparoscopy in kidney transplant.


Key words : Cystoplasty, Laparoscopic donor nephrectomy, Renal transplant, Ureteric stenting, Urinary diversion

Introduction

Kidney transplant is the treatment of choice for management of end-stage renal disease (ESRD). During the past 5 decades, indications for kidney transplant have been extended to more difficult and complicated cases. Today, recipients with different congenital and acquired diseases leading to ESRD are accepted to be included on wait lists for transplant.

Kidney transplant was started in 1984 in our department; since then, 5110 kidney transplant procedures have been performed. Deceased-donor transplant was started in 2000, when the law for deceased-donor transplant was passed in the parliament. At present, 60% of the kidney transplant procedures are from deceased donors, with 40% from living donors. We have performed 2081 cases of open donor nephrectomy (ODN), which is no longer performed in our department. We performed the first randomized clinical trial (RCT)1 comparing laparoscopic donor nephrectomy (LDN) with ODN. The RCT showed that LDN has less morbidity with graft outcomes similar to ODN. After completion of this RCT, LDN became routine in our center thereafter for the last 2309 cases. There have been 2801 cases of ODN, which is no longer preferred, and 2309 cases of LDN.

All cases of kidney transplant are registered in the “Collaborative Transplant Study” in Heidelberg, Germany. Rates of 1-year and 5-year graft survival are 95% and 90% for living-donor transplant and 93% and 83% for deceased-donor transplant, respectively (Figure 1).

During the past 34 years, our department has made several modifications and has accepted increasingly more challenging cases, resulting in overall gained experience (center effect). This report discusses some of these challenging cases.

Nonoperative Stent Removal in Kidney Transplant
We use the Lich Gregoir technique for uretero-vesical transplant with double J stenting. Since 2013, our center connects the double J stent to the tip of the Foley catheter, and the stent is removed within 1 week by removing the Foley catheter.2,3 Therefore, cystoscopy is avoided by removal of the stent, making the procedure more comfortable and less costly.

One-Suture, One-Knot Technique
Since 2006, arterial and venous anastomoses are performed with 1 suture, with only 1 knot used at the end of suturing, with artery and vein filled with blood to prevent purse-string effect (Figure 2). With this technique, the kidney remains in a stable position and is not touched or manipulated during the procedure. A fast and wide anastomosis can be achieved.4

Inverted Kidney Transplant for Right Donor Kidney
An innovative technique to transplant a right kidney with a short vein is done by clipping the vein during right LDN. So far, we have performed this new technique in 32 donors and their recipients. The right renal vein is ligated by Hem-o-Lok clips, which results in a short vein (< 1.5 cm). When the kidney is positioned inverted in the recipient, the renal vein is placed posteriorly and therefore adjacent to the external iliac vein, making a safe and simple venous anastomosis possible.5,6

Mini-Laparoscopic Donor Nephrectomy
Our center presented results of 100 donor nephrec­tomies performed by our group using mini-LDN.7 For this procedure, the instrument is introduced through 3.5-mm trocars. As shown in Figure 3, trocar sites are not visible and are barely visible in the visible area of the abdomen. The kidney is then delivered through a Pfannenstiel incision, which will be covered in the future by hair growth.

Simultaneous Unilateral Nephrectomy of Massively Enlarged Polycystic Kidney in Recipient During Kidney Transplant
Since 1987, instead of performing pretransplant bilateral nephrectomies in recipients with polycystic kidney disease, we only perform unilateral neph­rectomy from the same incision where the kidney transplant will be performed (Figure 4). This will make the procedure less invasive. This procedure is done only when necessary (that is, if there is not enough area for the kidney allograft). With unilateral nephrectomy, it is possible to save the contralateral polycystic kidney, which could assist with function of the new kidney.8,9

Management of Renal Mass in Native Kidney in Transplant Patients
As shown in Figure 5, we performed a simultaneous transperitoneal bilateral radical nephrectomy in a woman with body mass index of 36 kg/m2 (obese level); the procedure occurred 7 years after successful kidney transplant. We have also performed this procedure in a 34-year-old man with renal tumor in the right native kidney, which was discovered 22 years after successful transplant. Therefore, we recommend laparoscopic nephrectomy in recipients who develop tumors in their native kidneys instead of ODN, which is an invasive procedure for these patients and requires immunosuppression. Laparoscopic nephrectomy results in less pain, better cosmesis, and less hospitalization.

Zero-Ischemia Partial Nephrectomy for Treatment of Multifocal Renal Cell Carcinoma
Traditionally, if renal cell carcinoma is discovered in the transplanted kidney, radical nephrectomy is recommended, especially if there is more than 1 tumor. As shown in Figure 6, we were able to spare a transplanted kidney with 2 tumors (1 in the upper pole and 1 in the lower pole). This was possible with use of the enucleating technique on the tumor (without invading the tumor capsule) instead of the popular partial nephrectomy. We did not clamp the renal vessels, thus avoiding induced ischemia in the transplanted kidney.10

Management of Neurogenic Bladder in Kidney Transplant
We previously compared bladder augmentation before and after kidney transplant.11 One of the important diseases leading to ESRD is significant bladder dysfunction. Among the different kinds of neurogenic bladders that cause ESRD, a hypertonic bladder with dyssynergic sphincter is the most common type. Bladder augmentation has grown in popularity as a treatment for neurogenic bladder in renal transplant patients. Presently, ileocystoplasty is the common procedure for augmentation enterocys­toplasty. If a recipient with ESRD has gross vesicoureteral reflux, usually there is no need to do augmentation enterocystoplasty before renal trans­plant because there is a pop-off mechanism (Figure 7). Augmentation cystoplasties in selected patients before or after transplant are both safe and yield accepted morbidity.

In our center, we follow these steps when a patient with neurogenic bladder and ESRD is referred to us. If the patient has gross vesicoureteral reflux, kidney transplant is performed without doing enterocystoplasty and the patient is followed closely. If the patient has chronic renal failure and is on dialysis, kidney transplant is performed and the patient is followed. If an indication such as hydronephrosis in the transplanted kidney is shown, augmentation cystoplasty is performed. However, if the patient already has an augmented bladder, we will transplant the kidney on the augmented bladder.

Conclusions

Over our 34-year experience with kidney transplant procedures, we have performed a number of different innovative techniques. These techniques have widened patient indications for kidney transplant and have allowed us to accept more complicated patients who are on wait lists for transplant.


References:

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  10. Simforoosh N, Nadjafi-Semnani M. Long-term outcome of zero-ischemia partial nephrectomy for the treatment of multifocal renal cell carcinoma in renal transplant allograft: a case report. Exp Clin Transplant. 2019;17(Suppl 1):145-147.
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Volume : 18
Issue : 1
Pages : 10 - 15
DOI : 10.6002/ect.TOND-TDTD2019.L19


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From the Department of Urology and Renal Transplantation, Shahid Labbafinejad Hospital, Urology Nephrology Research Center, Shahid Beheshti University of Medical Science, Tehran, IR Iran
Acknowledgements: The authors have no sources of funding for this study and have no conflicts of interest to declare.
Corresponding author: Nasser Simforoosh, Pasdaran Ave. Ninth Boostan St., Department of Urology and Renal Transplantation, Shahid Labbafinejad Hospital, Tehran, IR Iran
Phone: +98 2122588016
E-mail: simforoosh@iurtc.org.ir