An important metric of liver transplantation outcome is not readily available: acceptance of organ offers. A recent study (E Mitchell et al. Liver Transplantation 2018; 24: 803-809) showed a great deal of variability among pediatric liver transplantation centers in this metric.
The authors examined data from 2007-2015 with 4088 unique patients and 27,094 match runs. The range in organ acceptance rates was 5.1% to 14.6% with a median of 8.9%.
- “Center-level acceptance rates were associated with wait-list mortality, with a >10% increase in the risk of wait-list mortality for every 1% decrease in a centers adjusted liver offer acceptance rate (odds ratio, 1.10, CI 1.01-1.19)
As noted in a previous post, Pediatric Liver Transplantation -Past Time to Split, larger centers generally have higher acceptance rates.
My take: This study adds to the literature regarding the inequities that some patients unknowingly face when listed in some centers.
Related article: HPJ van der Doef et al. Liver Transplantation 2018; 24: 810-9. This article describes the wait-list mortality of young patients with biliary atresia. Those listed before age 6 months and with higher MELD scores (>20) were at increased risk. Recognition of these factors may help improve allocation.
Related blog posts:
Hate it when this happens!
A recent retrospective cross-sectional cohort study (N Marcus et al. J Pediatr 2018; 196: 154-60, editorial page 10) identified 273 transplant recipients with a median followup of 3.6 years. This cohort included 111 liver transplant recipients, 103 heart transplant recipients, 52 kidney transplant recipients, and 7 multivisceral transplant recipients.
- 92 (34%) developed allergy or autoimmunity after transplantation.
- Allergic problems included eczema (n=44), food allergy (n=22), eosinophilic gastrointestinal disease (n=11), and asthma (n=28)
- Autoimmunity problems developed in 6.6% (18) including autoimmune cytopenias (n=10). Two patients died due to autoimmune hemolytic anemia and hemophagocytic lymphohistiocytosis.
- Allergic problems typically developed during the first year after transplantation and rarely after 5 years following transplantation.
- ~20% required a change in immunosuppression
- ~50% improved with time
In the editorial, the Dr. Helen Evans notes that the increasing reporting of atopic/allergic disorders could be due to recognition but could also be due, in part, to the widespread adoption of tacrolimus instead of cyclosporine for immunosuppression.
My take: Many have said that organ transplantation, which is life-saving, substitutes one problem for another. This is an example of an additional burden, often related to immunosuppression, that patients and families have to manage afterwards.
Chattahoochee River, Island Ford
As noted in a blog last year (More on its Past Time to Split), increased use of split livers can reduce liver transplantation waitlist mortality in children. Further justification for this approach is evident from a new study (DB Mogul et al. J Pediatr 2018; 196: 148-53, editorial pg 12) indicated that outcomes following split liver organs are equivalent to whole organ liver organs.
The authors examined two time periods: 2002-2009 and 2010-2015 using the Scientific Registry of Transplant Recipients. n=5715
- 1-year survival from split liver transplant (SLT) improved during the later period compared to the initial period: 95% versus 89%. n=1626 (28.5% of all transplants)
- 1-year survival from living donor liver transplant (LDLT) improved during the later period compared to the initial period: 98% versus 93%. n=661 (11.6% of all transplants)
- 1-year survival from whole liver transplant (WLT) was essentially unchanged during the later period compared to the initial period: 95% versus 94%. n=3428 (60% of all transplants)
These data show that survival after transplant is no longer worsened by SLT and may be higher for LDLT than WLT.
The editorial by Dr. Bae Kim and Dr. Vakili note that there have been several proposals to encourage more use of SLTs. One that was developed “would prioritize children <2 years old before local/regional adults except for those who were status 1 or who had a MELD score above 30.” At this point, these efforts to favor SLT allocation have not been adopted by UNOS Board of Directors.
My take (borrowed from editorial): “The question should no longer be ‘To split or not to split?’ but rather ‘Why should we let children die when we can now split livers safely?'”
Related blog posts:
Briefly noted: A recent study (L Ee et al. JPGN 2018; 66: 797-801) provides some good news for children who have had liver transplantation (LTx).
Among 42 patients (64% with biliary atresia) who had undergone LTx at a median age of 2.2 years and were long-term survivors (median time since LTx 10.1 yrs), mean bone mineral density (BMD) were normal. Lumbar BMD z-score -0.15 and total body BMD -0.76. Pathologic fractures were noted in 2 patients; these occurred within 18 months of transplantation.
My take: this study indicates that over time, most patients are not likely to have very low bone density.
D Wendel et al. JPGN 2018; 66: 212-7. This single center retrospective review examined patients who received home TPN prior to liver transplantation. These 18 patients, which represented 41% of their entire transplant cohort of 44 between 2010-2015, all had biliary atresia. Key findings:
- Malnutrition improved or resolved in all but one patient
- 8 catheter-related infections were noted (3.8/1000 catheter days)
- There were no deaths in patients receiving TPN
My take: While there is an increased burden of care with TPN, improved nutrition may improve long-term outcomes.
Related blog posts:
Amber Cove, Dominican Republic
If you think that teaching more self-management to adolescents will lead to better outcomes, you might be wrong. A recent study (RA Annunziato et al. J Pediatr 2018; 193: 128-33) shows that adolescents who reported greater self-management, following liver transplantation, had worse outcomes.
In this study of 9-17 year olds and their parents (213 dyads), the key finding was based on a score derived from the REFILS survey. REFILS is an acronym for “Responsibility and Familiarity with Illness Survey.” This survey was curtailed from 22 items to the following 13 items:
- Understands key aspects of liver disease
- Discusses management plan with team
- Self-manages liver regimen
- Knows names/dose of medications
- Keeps track of medications
- Correctly takes medications
- Calls pharmacy for refills
- Knows different types of providers
- Knows date of next appointment
- Makes appointments
- Know insurance details
- Understands insurance plan
- Keeps healthcare records
- “Negative outcomes were more likely to occur if patients reported that they are ‘in charge.’ A higher [REFILS] score, which denotes a higher level of (self-reported) management, was significantly and consistently correlated with worse adherence and organ rejection.”
The implication is that the transition of responsibilities from the parent/caregiver to the adolescent “may in fact not always be indicated or advisable…education about self-care might actually be harming patients…It is probably prudent to discourage rather than encourage adolescents from assuming self-care in some cases.”
My take: While adolescents and young adults are capable in many aspects, there are hardly any that I would trust to care for our dog (see below) for any protracted period. Thus, in my view, without close parental supervision, entrusting the life of a liver transplant recipient to an adolescent is risky.
Related blog posts:
A recent guideline update (ZM Younossi. Liver Transplantation 2018; 24: 166-70) provides some useful information about nonalcoholic fatty liver disease (NAFLD), nonalcoholic steatohepatitis (NASH), and liver transplantation (LT).
- “Despite metabolic comorbidities, posttransplant outcomes of NASH patients are generally good. In fact, 1-, 3-, and 5-year patient and graft survival rates are …similar to other liver diseases.”
- NASH/NAFLD can recur following LT…”NASH with significant fibrosis (stage ≥2) occurs in approximately 5% of recipients by 5 years after transplantation.”
- Additional issues to manage after LT, include weight management, and metabolic conditions including diabetes, hypertension, dyslipidemia, and hypertension. All of these conditions can be affected by specific immunosuppressants. For example, calcineurin inhibitors and corticosteroids can exacerbate type 2 diabetes mellitus.
My take: This article indicates better LT outcomes than I expected in patients with NASH/NAFLD.
Related blog posts:
Bright Angel Trail