Does the pediatric end-stage liver disease score or hepatic artery resistance index predict outcome after liver transplantation for biliary atresia?

Perioperative Complications After Pediatric Liver Transplantation-A Retrospective Analysis of 421 Cases

BACKGROUND

Due to the low incidence of pediatric liver transplantations, short- and long-term data regarding their outcome, details on early postoperative complications and their risk factors are under-represented in the literature.

METHODS

We retrospectively reviewed 1645 LTx performed at Hannover Medical School between January 2005 and December 2021. Of these, 421 transplantations were performed in 405 pediatric recipients. Univariate and multivariate binary logistic regressions were performed to identify independent risk factors for the onset of selected perioperative complications requiring intervention within the first 30 days following transplantation and their influence on graft and patient survival.

RESULTS

Pleural effusions represent the most common postoperative complication observed in 49.4% (n = 208) of cases, followed by vascular complications in 22.6% (n = 95) and biliary complications in 20.0% (n = 84) of cases. Donor age (OR: 1.019; p = 0.010) and recipient age between 3 and 12 years (OR: 1.849; p = 0.008) were identified as independent risk factors for the onset of pleural effusions. Retransplantations within the first year after LTx were necessary in 11.4% of all cases (n = 48). Twenty (4.8%) patients died within the first year after LTx.

CONCLUSION

Pleural effusions requiring postoperative intervention were observed in approximately half of the pediatric recipients. Therefore, the preemptive intraoperative placement of a chest drain under sterile conditions and general anesthesia should be considered. Our data further indicate that a two-stage procedure for biliary reconstruction may be the preferred procedure in patients at risk of early bile duct complications and retransplantation within the first year.

Shear wave elastography for evaluation of the urgency of liver transplantation in pediatric patients with biliary atresia

BACKGROUND

To investigate the role of two-dimensional shear wave elastography (2D-SWE) in the preoperative evaluation of pediatric patients with biliary atresia awaiting liver transplantation.

METHODS

Among a total of 152 pediatric patients enrolled in this single-institution prospective study between March 2018 and August 2019, 143 patients (age range, 4-97 months; median age, 7 months; 84 males, 59 females) who underwent successful routine ultrasound examination, SWE examination, and blood test before liver transplantation were included in the final analysis. The values of liver stiffness measured by SWE were compared with ultrasound and blood test parameters by Spearman's correlation analysis.

RESULTS

The overall median liver stiffness with 2D-SWE was 29.0 ± 10.9 kPa, with a range of 9.0-53.3 kPa. The success rate of 2D-SWE measurements was 98.0% (149/152). Liver stiffness measurement (LSMs) had no significant correlation with gender, age, weight, and height of the pediatric recipients. LSMs were correlated with ultrasound parameters including portal vein (PV) maximum velocity, PV direction, hepatic artery resistance index (HARI), spleen diameter, ascites, and blood test parameters (albumin level, platelet count level, and international normalized ratio). In the pediatric recipients with hepatofugal PV flow, high HARI (HARI ≧ 0.90), and ascites, or without Kasai operation, LSMs were significantly higher (P < .05).

CONCLUSIONS

SWE is feasible and valuable for assessing liver damage in children with biliary atresia awaiting liver transplantation and might be used as selection criteria for children in need of priority access to liver transplantation.

Preoperative hepatic hemodynamics in the prediction of early portal vein thrombosis after liver transplantation in pediatric patients with biliary atresia

BACKGROUND

Portal vein thrombosis (PVT) is one of the main vascular complications after liver transplantation (LT), especially in pediatric patients with biliary atresia (BA). This study aimed to assess the preoperative hepatic hemodynamics in pediatric patients with BA using Doppler ultrasound and determine whether ultrasonographic parameters may predict early PVT after LT.

METHODS

One hundred and twenty-eight pediatric patients with BA younger than 3 years of age underwent Doppler ultrasound within seven days before LT, between October 2006 and June 2013. The preoperative hepatic hemodynamic parameters were then compared between patients with early PVT (within 1 month following LT) and those without PVT. Receiver operating characteristic analysis was performed to determine the optimal cutoff value for predicting early PVT.

RESULTS

Of the 128 transplant recipients, 41 (32.03%) had a hypoplastic portal vein (PV), 52 (40.63%) had hepatofugal PV flow and 40 (31.25%) had a high hepatic artery resistance index (HARI) of ≥1. Nine cases (7.03%) experienced early PVT. A PV diameter ≤4 mm (sensitivity 88.89%, specificity 72.27%), and a hepatofugal PV flow (sensitivity 77.78%, specificity 62.18%) with a high HARI ≥1 (sensitivity 77.78%, specificity 72.27%) were hepatic hemodynamic risk factors for early PVT.

CONCLUSIONS

Hepatic hemodynamic disturbances in pediatric recipients with BA were more common. Small PV diameter (≤4 mm) and hepatofugal PV flow combined with high HARI (≥1) are strong warning signs of early PVT after LT in pediatric patients with BA. Intense monitoring of vascular patency and prophylactic thrombolytic therapy should be considered in pediatric patients undergoing LT for BA.

A comparison of two validated scores for estimating risk of mortality of children with intestinal failure associated liver disease and those with liver disease awaiting transplantation

BACKGROUND AND AIMS

To evaluate risk of mortality in children with intestinal failure associated liver disease (IFALD) compared with other liver disease using two validated scores.

METHODS

Sixty-seven children listed for transplant were studied: cholestatic liver disease (CLDn23); liver disease secondary to other processes (LDsec n11); (IFALDn22), acute liver failure (ALFn11). Paediatric Hepatology Score (PHD) score and Pediatric end-stage liver disease score (PELD) were evaluated by Receiver Operating Curves (ROC), proportional hazards regression.

RESULTS

The highest PHD and PELD scores were found in ALF; the lowest in LDsec. Both scores correlated well in identifying waiting list (WL) mortality in patients with CLD and ALF, but not in those with IFALD where PELD scores were lower. Cox proportional hazard regression of time spent on the waiting list prior to death or transplant/delisting showed significant associations with PHD (P=0.006) and PELD (P=0.008). WL mortality was strongly predicted by disease group (6/8 deaths in IFALD). ROC analysis of all data showed that a PHD score greater than 15.5 had sensitivity of 87.5% and specificity of 81% for waiting list mortality (P<0.001); PELD greater than 8 had a sensitivity of 87.5% and specificity of 40%. Neither PHD nor PELD scores correlated with post-transplant mortality.

CONCLUSION

PHD and PELD scores had the same sensitivity for identifying risk of WL mortality in all patients, but PELD failed to identify the sickest children with IFALD, lowering its specificity. The PHD score has the added advantage for European centres of being in SI units, not requiring a computer application to calculate and was simpler to use at bedside.

Mortality of biliary atresia in children not undergoing liver transplantation in the Netherlands

In order to further improve the outcome of BA, we characterized the mortality of BA patients who did not undergo OLT in the Netherlands, and compared our results with international data. For this purpose, we analyzed the causes of mortality of non-transplanted BA patients before the age of five yr, using the NeSBAR database. To evaluate trends in mortality, we compared the cohort 1987-1996 (n=99) with 1997-2008 (n=111). We compared clinical condition at OLT assessment with available international data, using the PELD-score. Mortality of non-transplanted BA children was 26% (26/99) in 1987-1996 and 16% (18/111) in 1997-2008 (p=0.09). Sepsis was the prevailing direct cause of death (30%; 13/44). PELD-scores at the time of assessment were higher in non-transplanted BA patients (median 20.5; range 13-40) compared with international data (mean/median between 11.7 and 13.3). Based on our national data, we conclude that pretransplant mortality of BA patients is still considerable, and that sepsis is a predominant contributor. Our results strongly indicate that the prognosis of patients with BA in the Netherlands can be improved by earlier listing of patients for OLT and by improving pretransplant care.

Timing of liver transplantation in biliary atresia-results in 71 children managed by a multidisciplinary team

BACKGROUND

Kasai portoenterostomy (KP) remains the initial surgical therapy for biliary atresia (BA). Liver transplantation (LTx) is offered after a failed KP or if KP is not feasible. The timing of LTx in these children is not well established. We attempted to define factors that may help choose the optimal timing for LTx in children with BA managed by a multidisciplinary team including a pediatric surgeon, hepatologist, and liver transplant surgeon.

METHODS

Records of children who underwent LTx for BA at our institution between January 1998 and December 2006 were reviewed. Clinical data such as pre-LTx pediatric end-stage liver disease (PELD) score, location of KP, and outcome were evaluated.

RESULTS

Seventy one children underwent 77 liver transplants for BA at an average age of 25 months (range, 3-216 months). Sixty-one had a previous KP, 30 at our institution. Ten had LTx without KP. The overall patient survival was 94.4% and overall graft survival was 87% at median follow-up of 58 months (range, 6-111 months). Four patients died, 1 because of vascular thrombosis despite repeat LTx, 1 because of fungal infection after LTx, and 2 because of causes unrelated to LTx. Six children required retransplantation. Living donor liver transplantation was performed in 32 of these children with 91% patient and graft survival. Fifty-three children had a PELD score of 10 or higher with patient and graft survivals of 92% and 86%, respectively. Eighteen children had a PELD score of less than 10 with patient and graft survivals of 100%. For the 30 children who underwent KP at our institution, the median age at LTx was 9 months (range, 3-168 months), and patient and graft survival were both 93%.

CONCLUSIONS

Outcome of LTx for BA is excellent. Children with higher PELD scores (>/=10) at LTx may have worse outcome. Children with a PELD score of less than 10 survived with their original grafts. In children with BA, the PELD score should be monitored and may help stratify patients for eventual LTx. When a child with BA is deemed a candidate for LTx, the PELD score should be determined. A PELD score that approaches 10 should trigger discussion of LTx and living donor liver transplantation with the family.

Outcomes following liver transplantation

As the field of Liver Transplantation has matured, survival alone is no longer an acceptable single metric of success. This chapter explores the impact of the PELD system for donor organ allocation, surgical modification of donor organs, living donation, and long-term transplant-related complications on overall quality of life and outcome. Strategies to improve survival, overall outcome, and health-related quality of life in long-term recipients are outlined.