The effects of venovenous bypass use in liver transplantation with piggyback technique: a propensity score-weighted analysis

Venovenous bypass (VVB) use during liver transplantation (LT) is notably variable among the centres and it is actually restricted to surgically complex cases, severely unstable recipients or grafts from high-risk donors. Historically, VVB was associated with the classical LT with caval cross clamping, while not much is known about the safety of this technique applied to piggyback LT. This retrospective observational study evaluated the effects of VVB applied to piggyback LT on mortality, hospital outcomes, postoperative graft and other organ dysfunction. We retrospectively collected data about recipient status, surgical complexity and graft quality of all the piggyback LTs performed at the Transplant Unit of IRCCS Azienda Ospedaliero-Universitaria di Bologna, Italy, from January 2012 to December 2022. A propensity score (PS) was built taking into account the variables possibly associated with either VVB choice and the investigated outcomes with the average treatment overlap method. PS-weighted general linear models (GLMs) were developed to investigate the adjusted effect of VVB use on the selected outcomes. The final analysis included 874 LT cases, of whom 74 (8.5%) underwent VVB. The effective sample sizes after PS-weighting were 280.2 and 64.3 patients in the no-VVB and VVB groups, respectively. PS-weighted GLMs did not show any differences regarding hospital and graft-related outcomes. However, significantly higher odds ratios for serum creatinine > 2 mg/dL and AKIN stage 2 or 3 during the first 24 h after ICU admission together with a higher renal replacement therapy need during ICU stay were reported for VVB exposure in the weighted analyses. This study suggests similar mortality and length of stay but a higher risk for postoperative acute kidney injury in patients undergoing piggyback LT with VVB.

One-shot side-to-side anastomosis (OSSSA) with stapler for cavo-cavostomy in liver transplantation: the first step towards a fully mechanized liver transplant?

BACKGROUND

In literature, a variety of caval reconstruction techniques for liver transplantation have been reported. The piggyback technique preserves the recipient's caval vein which is directly anastomosed to donor's inferior vena cava (IVC) allowing for the reduction of hemodynamic compromise during liver transplantation.

METHODS

Herein, we present our standardized step-by-step technique for the realization of a caval one-shot side-to-side anastomosis (OSSSA) using a linear stapler. A Satinsky vascular clamp is placed in a top down direction to realize a longitudinal partial clamping of the recipient IVC. A 1-cm venotomy is then performed on the anterior wall of the recipient IVC to permit the easy introduction of the vascular stapler arm in order to perform the mechanical anastomosis. Portal vein, hepatic artery, and biliary anastomosis are then completed in standard fashion.

CONCLUSIONS

Compared to the manual one, this mechanical anastomosis permits to reduce operative time, caval and portal vein clamping, warm ischemia time, and visceral congestion.

RESULTS

In our opinion, this is a rapid, easy, safe, and reproducible technique to perform the side-to-side cavocaval anastomosis during liver transplantation in selected patients when a manual anastomosis may be technically challenging.

Off-Label Use of Phakic Intraocular Lens with a "Piggyback" Technique

Purpose

We report a case of a highly myopic pseudophakic patient who received off-label placement of a phakic intraocular lens (pIOL) via a “piggyback” technique, allowing the placement of an intraocular lens (IOL) in his fellow eye, resulting in improved visual acuity and emmetropia.

Case Report

A 66-year-old, highly myopic, pseudophakic male with an IOL implant in his left eye was referred for second opinion for surgical options for his phakic right eye. Given the severe myopic status of both eyes, he received off-label placement of a posterior chamber pIOL with a piggyback technique for the pseudophakic left eye followed by standard cataract surgery and intraocular lens implantation in the right eye. For the left eye, uncorrected best visual acuity improved from 20/70 to 20/25.

Conclusion

This case demonstrates the successful off-label use of a phakic IOL in a pseudophakic, highly myopic patient with a piggyback technique, resulting in improved visual acuity and ultimately allowing IOL placement in the fellow eye for emmetropia. This off-label use of pIOL can offer ophthalmologists an alternative option for pseudophakic patents with severe refractive error.

Technical Aspects of Orthotopic Liver Transplantation for Hepatocellular Carcinoma

Hepatocellular carcinoma (HCC) remains a significant malignancy and is the second leading cause of cancer death worldwide. Multiple therapeutic strategies exist for patients with HCC including locoregional therapy, liver resection, and liver transplantation. In many instances locoregional therapy is used to decrease tumor burden and "bridge" patients to liver transplant. Surgical technique during liver transplantation may need to be altered in light of these preoperative therapies used for treating HCC. In this review we discuss the technical aspects of liver transplantation and how they are impacted in patients with HCC.

Caval reconstruction techniques in orthotopic liver transplantation

There are several caval reconstruction techniques currently in use for orthotopic liver transplantation. These include caval replacement or the conventional technique, performed with or without venovenous bypass, piggyback technique with anastomosis with two or three hepatic veins with or without cavotomy and modifications of the piggyback technique including end-to-side and side-to-side cavocaval anastomosis. There are few randomized controlled trials comparing the use of these techniques and our knowledge of their comparability is based on a few multi- and many single-center retrospective and prospective reviews. Although there are advantages and disadvantages for each technique, it is advisable that the surgeon perform the technique with which they have the most the experience and at which they are the most skilled as excellent outcomes can be obtained with any of the caval reconstruction options discussed.

Side-to-side caval anastomosis in a patient receiving a liver graft from a marginal donor with situs inversus totalis

INTRODUCTION

The donor situs inversus totalis status was considered an absolute contraindication to liver transplantation due to the technical difficulties involved. Only in recent years has a very young deceased donor with situs inversus totalis been considered as a potential donor.

PRESENTATION OF CASE

We herein report a single case of 57-year-old male patient with hepatocellular carcinoma who received a liver transplantation from a 73-year-old woman with situs inversus totalis. Liver was implanted using a 1992-Belghiti piggyback technique positioning the larger hemiliver in the left upper quadrant and the left in the liver fossa. We assisted a good graft reperfusion without surgical or anesthetic problems. His hospital stay was relatively uneventful and he was discharged from hospital on postoperative day 7. At 8 months of follow-up the patient is alive and in good clinical condition.

DISCUSSION

The donor situs inversus totalis does not require any modification of transplant procedure if the donor-recipient size match permits a comfortable placement of the graft in a standard anatomical position. To the best of our knowledge, this is the first case of liver transplantation with a graft from a "marginal" donor with situs inversus totalis using a 1992-Belghiti piggyback technique.

CONCLUSION

The donor situs inversus totalis status should not be considered a contraindication for LT and the piggyback technique should be considered the surgery of choice.