[Living donor liver transplantation of the right liver lobe between adults]

Liver volume measurement: reason of the difference between in vivo CT-volumetry and intraoperative ex vivo determination and how to cope it

Purpose

Volumetric assessment of the liver regularly yields discrepant results between pre- and intraoperatively determined volumes. Nevertheless, the main factor responsible for this discrepancy remains still unclear. The aim of this study was to systematically determine the difference between in vivo CT-volumetry and ex vivo volumetry in a pig animal model.

Material and Methods

Eleven pigs were studied. Liver density assessment, CT-volumetry and water displacement volumetry was performed after surgical removal of the complete liver. Known possible errors of volume determination like resection or segmentation borders were eliminated in this model. Regression analysis was performed and differences between CT-volumetry and water displacement determined.

Results

Median liver density was 1.07 g/ml. Regression analysis showed a high correlation of r² = 0.985 between CT-volumetry and water displacement. CTvolumetry was found to be 13% higher than water displacement volumetry (p < 0.0001).

Conclusion

In this study the only relevant factor leading to the difference between in vivo CT-volumetry and ex vivo water displacement volumetry seems to be blood perfusion of the liver. The systematic difference of 13 percent has to be taken in account when dealing with those measures.

Living Donor Right Liver Lobes: Preoperative CT Volumetric Measurement for Calculation of Intraoperative Weight and Volume

PURPOSE

To prospectively develop equations for the calculation of expected intraoperative weight and volume of a living donor's right liver lobe by using preoperative computed tomography (CT) for volumetric measurement.

MATERIALS AND METHODS

After medical ethics committee and state medical board approval, informed consent was obtained from eight female and eight male living donors (age range, 18-63 years) for participation in preoperative CT volumetric measurement of the right liver lobes by using the summation-of-area method. Intraoperatively, the graft was weighed, and the volume of the graft was determined by means of water displacement. Distributions of pre- and intraoperative data were depicted as Tukey box-and-whisker diagrams. Then, linear regressions were calculated, and the results were depicted as scatterplots. On the basis of intraoperative data, physical density of the parenchyma was calculated by dividing weight by volume of the graft.

RESULTS

Preoperative measurement of grafts resulted in a mean volume of 929 mL +/- 176 (standard deviation); intraoperative mean weight and volume of the grafts were 774 g +/- 138 and 697 mL +/- 139, respectively. All corresponding pre- and intraoperative data correlated significantly (P < .001) with each other. Intraoperatively expected volume (V(intraop)) in millilliters and weight (W(intraop)) in grams can be calculated with the equations V(intra)(op) = (0.656 . V(preop)) + 87.629 mL and W(intra)(op) = (0.678 g/mL . V(preop)) + 143.704 g, respectively, where preoperative volume is V(preop) in milliliters. Physical density of transplanted liver lobes was 1.1172 g/mL +/- 0.1015.

CONCLUSION

By using two equations developed from the data obtained in this study, expected intraoperative weight and volume can properly be determined from CT volumetric measurements.

[Living donor liver transplantation from the perspective of the donor: results of a psychosomatic investigation]

OBJECTIVES

Living donor liver transplantation (LDLT) has been gaining importance in the treatment of endstage liver disease in adults. Thus far, only few empirical studies have been published on the psychosocial situation of donors who are faced with the risk of medical complications after resection of the right hepatic lobe. The aims were to describe the clinical problems before and after transplantation and to contribute to the discussion of ethical issues based on empirical findings.

METHODS

In the present overview, the pre-/post-transplant and follow-up periods are characterized from a psychosocial point of view using actual psychosocial and medical findings in living donors of the right hepatic lobe.

RESULTS

Before LDLT, 11 % of potential donors were not recommended for the transplantation due to marked ambivalence about the operation. After donation 26 % of donors showed high values for anxious depression and physical complaints despite low rates of surgical complications.

CONCLUSIONS

For clinical psychosomatic evaluations of potential donors it is important to provide donors an opportunity to report any misgivings and anxieties as openly as possible. The psychosocial impairment and physical complaints of some donors after transplantation are yet not clearly understood. More psychosocial studies in this field will be necessary to investigate ethical questions and to develop criteria for an evidence-based medical care of living donors.

Extended left hepatectomy--modified operation planning based on three-dimensional visualization of liver anatomy

BACKGROUND

Based on the patient history of a 62-year-old man with a centrally located hepatocellular carcinoma we describe the potential influence of three-dimensional computed tomography (3D CT) on operation planning in extended left hepatectomy.

METHOD AND RESULTS

By 3D reconstruction of the liver, not only variations of the intrahepatic vascular structure but also the number and extent of portal venous segments, as well as their relation to hepatic veins, can be visualized. Thus, areas at risk for either devascularization or venous congestion may be identified prior to liver resection. This is particularly important in extended hepatectomies with a small liver remnant, where already minor complications may have fatal consequences.

CONCLUSION

In these resections, operation planning may be improved substantially by pre-operative 3D reconstruction.

Determinants of hospital mortality of adult recipients of right lobe live donor liver transplantation

OBJECTIVE

To define the technical factors that might contribute to hospital mortality of recipients of right lobe live donor liver transplantation (LDLT) so as to perfect the design of the operation.

SUMMARY BACKGROUND DATA

Right lobe LDLT has been accepted as one of the treatments for patients with terminal hepatic failure, but the design and results of the reported series vary and the technical factors affecting hospital mortality have not been known.

METHODS

The data of 100 adult-to-adult right lobe LDLT performed between 1996 and 2002 were prospectively collected and retrospectively analyzed. All grafts except one contained the middle hepatic vein, which was anastomosed to the recipient middle/left hepatic vein in the first 84 recipients and directly into the inferior vena cava (with the right hepatic vein in form of venoplasty) in the subsequent 15 patients. Venovenous bypass was used routinely in the first 29 patients but not subsequently.

RESULTS

Eight patients died within the same hospital admission for liver transplantation. There was no hospital mortality in the last 53 recipients. Comparison of data of patients with or without hospital mortality showed that graft weight/body weight ratio, graft weight/estimated standard liver weight ratio, technical error resulting in occlusion/absence of the middle hepatic vein, use of venovenous bypass, the lowest body temperature recorded during surgery, the volume of intraoperative blood transfusion, fresh frozen plasma, and platelet infusion were significantly different between the two groups. However, the pretransplant intensive care unit status of the recipients, cold and warm ischemic time of the graft, and occurrence of biliary complications were not. By multivariate analysis, low body temperature recorded during operation, low graft weight/estimated standard liver weight ratio (</=0.35), and the middle hepatic vein occlusion were independent significant factors in determining hospital mortality.

CONCLUSIONS

To achieve a uniformly successful right lobe LDLT, the right lobe graft must contain a patent middle hepatic vein. With a completely patent middle hepatic vein, a graft size of >35% of the estimated standard graft weight may be sufficient for recipient survival. Hypothermia, which predisposes to coagulopathy and is enhanced by the use of venovenous bypass and massive blood, and blood product transfusion must be avoided.

Right living donor liver transplantation: an option for adult patients: single institution experience with 74 patients

OBJECTIVE

To present an institutional experience with the use of right liver grafts in adult patients and to assess the practicability and efficacy of this procedure by analyzing the results.

SUMMARY BACKGROUND DATA

Living donor liver transplantation (LDLT) for the pediatric population has gained worldwide acceptance. In the past few years, LDLT has also become feasible for adult patients due to technical evolution in hepatobiliary surgery and increased experience with reduced-size and split-liver transplants. Nevertheless, some graft losses remain unexplained and are possibly due to unrecognized venous outflow problems.

METHODS

From April 1998 to September 2002, we performed 74 right LDLTs (segments 5-8). The 74 donors were selected from 474 candidates according to standard protocol. The median age of the donors was 35 years (range 18-58 years) and 51 years (range 18-64 years) in recipients. Standard and extended indications for transplantation were considered. Over the period reported, technical modifications in the bile duct anastomosis (duct-to-duct, end-to-end, or end-to-side) and a new graft implantation technique that provides maximized venous outflow, leading to outcome improvement, were developed.

RESULTS

64.9% of patients had liver cirrhosis and 35.1% had malignancy. While 44 donors (59.5%) presented an uneventful postoperative course, 27% minor (pleural effusion, pneumonia, venous thrombosis, wound infection, incisional hernia) and 13.5% major (biliary leakage, death of a donor due to unrecognized hereditary liver disease, and consecutive liver insufficiency) complications were documented. In recipients, 23% biliary complications and 6.8% hepatic artery thrombosis occurred. The overall patient and graft survival rate after 1 year was 79.4% and 75.3%, respectively. In cases with extended indication, the patient survival rate was 74% and the graft survival rate 68% at 12 months. Using technical modifications in the last 10 recipients, including 2 critically decompensated cirrhotics, the survival rate was 100% at a median follow-up of 3.5 months.

CONCLUSIONS

In our transplant program, living donor liver transplantation has become a standard option in the adult patient population. The critical issue of this procedure is donor morbidity. Technical improvements in the harvesting and implantation of right grafts can also offer hope to patients with challenging forms of end-stage liver disease or malignant liver tumors.