26 - World Journal of Gastroenterology

Table 2 Serological values in different groups
struction became globally accepted [13-18] . It is reasonable to
speculate that biliary complications after liver transplantation
might be more common in rats than that in human
beings. Unfortunately, few studies can be found to investigate
and report the incidence of biliary complications in
ROLT. In our study, we simulated the biliary processes of
ROLT in Group B, and found that the incidence of complications
were significantly higher in groups with hepatic
artery ligation than those without, which meant that hepatic
artery might play an important role in the occurrence
and development of biliary complications, but further
investigations are needed to verify the definite mechanism.
Bile duct reconstruction by stent has been well accepted
since Kamada introduced the “two-cuff ” technique
in ROLT [12-18] . But in view of our experience in over 600
cases of rat orthotopic liver transplantation, it seems that
biliary complications after orthotopic liver transplantation
are almost inevitable in the classical model. Several reasons
might be contributed to this: Firstly, the wall of bile duct
will become thicker as the rat grows up, constant inner
diameter of the stent will definitely make the bile duct relatively
narrow. Secondly, the stent would become a foreign
body in bile, which will make the eddy come into being at
the proximal stent and induce the sludge. So it is a great
challenge to seek a new approach to modify the ROLT
model. This new approach should reduce the incidence of
biliary complications, and be easier to achieve.
Choledochojejunostomy has been proved to be an effective
surgery to reconstruct the bile duct in clinical liver
transplantation, which does not increase the incidence
of biliary complications compared with the end-to-end
anastomosis [19-22] . In our study, we simulated the method
and designed the duct-duodenum reconstruction model.
Unfortunately, this method did not show ideal results, the
incidence of biliary complications was significantly higher
in A2 (duct-duodenum reconstruction) than that in A2
(duct-duct reconstruction) due to the following reasons: in
ROLT, the stent is directly driven into the upper part of
the duodenum, which makes the stent easily obstructed by
chime and then more likely to have biliary complications.
Based on our study, although choledochojejunostomy has
been widely used in liver transplantation, duct-duodenum
reconstruction is obviously not an ideal choice in ROLT.
In conclusion, biliary complications are almost in-
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Li GL et al . Biliary complications in rat liver transplantation
n AST (U/L) ALT (U/L) TBIL (μ mol/L) DBIL (μ mol/L) GGT (U/L) ALP (U/L)
A1 30 452.2 ± 296.9 223.7 ± 194.7 17.1 ± 26.0 14.8 ± 24.1 10.5 ± 6.2 366.5 ± 173.0
A2 30 534.2 ± 373.3 272.8 ± 274.7 11.6 ± 21.8 10.2 ± 20.2 8.0 ± 7.3 282.8 ± 154.9
B1 10 146.6 ± 43.6 75 ± 17.7 0.79 ± 1.59 0.54 ± 1.26 4.6 ± 3.8 208.6 ± 76.4
B2 10 108.7 ± 26.4 70.0 ± 6.6 0.33 ± 0.25 0.09 ± 0.12 2.5 ± 0.97 190.2 ± 44.2
B3 10 359.3 ± 452.4 126.6 ± 131.9 15.1 ± 31.3 11.5 ± 24.1 7.3 ± 5.1 240 ± 152.0
B4 10 271.2 ± 275.2 119.3 ± 138.2 9.7 ± 27.3 7.42 ± 21.5 5.7 ± 2.8 236.3 ± 158.3
Group C 5 81.7 ± 13.2 60.7 ± 4.5 0.13 ± 0.15 0 ± 0 2.7 ± 0.58 281.7 ± 139.3
ALT: Alanine aminotransferase; ALP: Alkaline phosphatase; AST: Aspartate aminotransferase; TBIL: Total bilirubin; DBIL: Direct bilirubin; GGT: Gummaglutamyl
transpeptidase.
evitable using the classical “two-cuff ” technique. More
attention should be paid to the occurrence of biliary
complications in ROLT model. The established mode
of hepatic artery and biliary reconstruction should be
modified.
COMMENTS
Background
Biliary complication is the second most common cause of graft dysfunction in
liver transplantation with an incidence rate of as high as 64%. Unfortunately,
few researches could be found to report the incidence of biliary complications in
rat liver transplantation. In this study, the authors investigated the biliary complications
after rat orthotopic liver transplantation, trying to find a better way to
perform biliary reconstruction and reduce the incidence of biliary complications
after transplantation
Research frontiers
Classical rat liver transplantation model using the “two-cuff” technique introduced
by Kamada has been well accepted since 1983, but the incidence of biliary
complications remains extremely high, there is an urgent need to improve
the technology for biliary reconstruction.
Innovations and breakthroughs
Most previous studies used the “two-cuff” technique to establish rat liver transplant
models, but few focused on the high incidence of biliary complications. In
view of the experience in over 600 cases of rat orthotopic liver transplantation
in this study, biliary complications are almost inevitable by using the classical
“two-cuff” technique.
Applications
More attention should be paid to the occurrence of biliary complications in
ROLT model. The established mode of hepatic artery and biliary reconstruction
should be modified.
Terminology
Biliary complications: often include hilar abscess, intrahepatic and extrahepatic
biliary dilatation, biliary sludge. “Two-cuff” technique: A classical method used
in rat liver transplantation, which was first introduced by Kamada et al. The key
steps are: Portal vein and infrahepatic inferior vena cava are induced through
the cuffs and the distal end of the vein is completely reversed and fixed onto the
cuff with a 5-0 silk ligation.
Peer review
The paper is well designed and the experience is valuable to be published.
REFERENCES
1 Inomata Y, Uemoto S, Asonuma K, Egawa H. Right lobe
graft in living donor liver transplantation. Transplantation
2000; 69: 258-264
2 Marcos A, Ham JM, Fisher RA, Olzinski AT, Posner MP.
Single-center analysis of the first 40 adult-to-adult living donor
liver transplants using the right lobe. Liver Transpl 2000; 6:
296-301
3143 July 14, 2011|Volume 17|Issue 26|