Retrospective Study Open Access
Copyright ©The Author(s) 2024. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Gastrointest Surg. Jul 27, 2024; 16(7): 2054-2064
Published online Jul 27, 2024. doi: 10.4240/wjgs.v16.i7.2054
Spleen volume is associated with overt hepatic encephalopathy after transjugular intrahepatic portosystemic shunt in patients with portal hypertension
Chun-Juan Zhao, Chao Ren, Guo-Hui Bai, Jin-Hui Li, Hui Zhang, College of Medical Imaging, Shanxi Medical University, Taiyuan 030001, Shanxi Province, China
Chun-Juan Zhao, Hui Zhang, Department of Radiology, The First Hospital of Shanxi Medical University, Taiyuan 030001, Shanxi Province, China
Zhen Yuan, Department of Occupational Health, School of Public Health, Shanxi Key Laboratory of Environmental Health Impairment and Prevention, NHC Key Laboratory of Pneumoconiosis, MOE Key Laboratory of Coal Environmental Pathogenicity and Prevention, Shanxi Medical University, Taiyuan 030001, Shanxi Province, China
Jin-Yu Li, Long Gao, Dui-Ping Feng, Department of Oncological and Vascular Intervention, The First Hospital of Shanxi Medical University, Taiyuan 030001, Shanxi Province, China
Jin-Yu Li, Long Gao, Dui-Ping Feng, Shanxi Provincial Clinical Research Center for Interventional Medicine, The First Hospital of Shanxi Medical University, Taiyuan 030001, Shanxi Province, China
Ze-Qi Duan, First Clinical Medical College, Shanxi Medical University, Taiyuan 030001, Shanxi Province, China
Hui Zhang, Shanxi Key Laboratory of Intelligent Imaging and Nanomedicine, The First Hospital of Shanxi Medical University, Taiyuan 030001, Shanxi Province, China
Hui Zhang, Intelligent Imaging Big Data and Functional Nano-imaging Engineering Research Center of Shanxi Province, The First Hospital of Shanxi Medical University, Taiyuan 030001, Shanxi Province, China
ORCID number: Chun-Juan Zhao (0000-0002-6626-0118); Chao Ren (0009-0007-4810-4086); Jin-Yu Li (0000-0003-2563-5937); Long Gao (0000-0002-2803-3416); Dui-Ping Feng (0000-0003-4516-3797); Hui Zhang (0000-0002-8777-4206).
Co-corresponding authors: Dui-Ping Feng and Hui Zhang.
Author contributions: Zhao CJ, Gao L, Feng DP, and Zhang H contributed to study conception and design; Zhao CJ, Bai GH, Li JY, and Duan ZQ contributed to data acquisition; Ren C, Yuan Z, Li JH, and Feng DP contributed to data analysis and interpretation; Zhao CJ, Ren C, Feng DP, and Zhang H contributed to manuscript writing, critical revision of the manuscript, and statistical analysis; and all authors vouched for the veracity and completeness of the data and analyses presented, and reviewed and approved the final version of the manuscript. Zhang H and Feng DP contributed equally to the work and should be regarded as co-corresponding authors.
Supported by National Natural Science Foundation of China (General Program), No. 82200650; the Key Research and Development Projects of Shanxi Province, No. 202102130501014; and the Natural Science Foundation of Shanxi Province, No. 202203021211021, No. 202203021212046, and No. 20210302123258.
Institutional review board statement: The Institutional Review Board of First Hospital of Shanxi Medical University approved this study (Approval No. K-K231).
Informed consent statement: All study participants, or their legal guardian, provided informed written consent prior to study enrollment.
Conflict-of-interest statement: All the authors report no relevant conflicts of interest for this article.
Data sharing statement: Data can be acquired from the corresponding author.
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: https://creativecommons.org/Licenses/by-nc/4.0/
Corresponding author: Hui Zhang, PhD, Professor, College of Medical Imaging, Shanxi Medical University, No. 56 Xinjian South Road, Yingze District, Taiyuan 030001, Shanxi Province, China. zhang_hui@sxmu.edu.cn
Received: February 26, 2024
Revised: May 6, 2024
Accepted: May 27, 2024
Published online: July 27, 2024
Processing time: 147 Days and 3.8 Hours

Abstract
BACKGROUND

Portal shunt and immune status related to the spleen are related to the occurrence of hepatic encephalopathy (HE). It is unknown whether spleen volume before transjugular intrahepatic portosystemic shunt (TIPS) is related to postoperative HE.

AIM

To investigate the relationship between spleen volume and the occurrence of HE.

METHODS

This study included 135 patients with liver cirrhosis who underwent TIPS, and liver and spleen volumes were elevated upon computed tomography imaging. The Kaplan-Meier curve was used to compare the difference in the incidence rate of HE among patients with different spleen volumes. Univariate and multivariate Cox regression analyses were performed to identify the factors affecting overt HE (OHE). Restricted cubic spline was used to examine the shapes of the dose-response association between spleen volumes and OHE risk.

RESULTS

The results showed that 37 (27.2%) of 135 patients experienced OHE during a 1-year follow-up period. Compared with preoperative spleen volume (901.30 ± 471.90 cm3), there was a significant decrease in spleen volume after TIPS (697.60 ± 281.0 cm3) in OHE patients. As the severity of OHE increased, the spleen volume significantly decreased (P < 0.05). Compared with patients with a spleen volume ≥ 782.4 cm3, those with a spleen volume < 782.4 cm3 had a higher incidence of HE (P < 0.05). Cox regression analysis showed that spleen volume was an independent risk factor for post-TIPS OHE (hazard ratio = 0.494, P < 0.05). Restricted cubic spline model showed that with an increasing spleen volume, OHE risk showed an initial increase and then decrease (P < 0.05).

CONCLUSION

Spleen volume is related to the occurrence of OHE after TIPS. Preoperative spleen volume is an independent risk factor for post-TIPS OHE.

Key Words: Hepatic encephalopathy, Transjugular intrahepatic portosystemic shunt, Spleen volume, Portal hypertension, Cirrhosis

Core Tip: This study included 135 patients with liver cirrhosis who underwent transjugular intrahepatic portosystemic shunt (TIPS), and spleen volumes were elevated by computed tomography-scan imaging. The results showed that there was a significant decrease in spleen volume after TIPS in overt hepatic encephalopathy (OHE) patients. The patients with a smaller spleen volume had a higher incidence of HE. Preoperative spleen volume was an independent risk factor for postoperative OHE in TIPS. In conclusion, spleen volume is closely related to the occurrence of OHE after TIPS. Preoperative spleen volume is an independent risk factor for post-TIPS OHE.



INTRODUCTION

Cirrhotic portal hypertension is a clinical syndrome characterized by esophageal and gastric variceal bleeding and ascites[1,2]. Transjugular intrahepatic portosystemic shunt (TIPS) is an effective treatment method for cirrhotic portal hypertension by reducing the gradient of portal venous pressure[3-7]. Hepatic encephalopathy (HE) is a common complication after TIPS[8,9]. The incidence rate of overt HE (OHE) after TIPS ranges from 15% to 48%[10]. OHE patients exhibit symptoms such as cognitive impairment, unclear language, drowsiness, and even coma[10,11]. It seriously hinders the quality of life of patients and is also the main reason for their readmission. Therefore, finding important factors affecting OHE after TIPS will help to screen high-risk groups, reduce the incidence rate of OHE after TIPS, and improve the survival prognosis of patients.

The occurrence of HE after TIPS is related to the shunt components and shunt flow rate[12,13]. The spleen, as an immune organ that interacts with the liver, participates in the progression of liver diseases[14,15]. The hemodynamic changes caused by TIPS affect the speed of splenic venous return into the liver, and components of the spleen entering the liver are also be affected. Previously, it was reported that peripheral interleukin (IL)-6 levels were associated with postoperative OHE after TIPS, and the total amount of venous return to the liver was a certain amount[16]. An increase in splenic venous return implies a decrease in various metabolites in superior mesenteric venous shunt, theoretically leading to a decrease in the incidence of HE. Therefore, abnormalities in the spleen may be one of the reasons affecting OHE after TIPS.

In recent years, with the development of imaging in the treatment of liver diseases, noninvasive assessment of spleen volume and stiffness based on ultrasound and computed tomography (CT) has been widely used in cirrhotic patients with portal hypertension[17-19]. However, there are few reports on whether noninvasive liver and spleen assessment based on imaging data can predict postoperative OHE. Therefore, the purpose of this study was to determine whether preoperative spleen size is related to the incidence of OHE after TIPS, and to stratify the risk of OHE in TIPS patients.

MATERIALS AND METHODS
Patient selection

This study retrospectively analyzed 135 patients with liver cirrhosis who underwent TIPS treatment evaluated by interventional radiologists at the First Affiliated Hospital of Shanxi Medical University. We conducted a 1-year follow-up of these patients. The inclusion criteria were: (1) Meeting the indications for TIPS in liver cirrhosis; (2) TIPS treatment performed according to the guidelines between July 1, 2019 and May 31, 2022; and (3) Age > 18 years. The exclusion criteria (Figure 1) were: (1) Malignant tumors and hematological diseases; (2) Severe infection; (3) TIPS failure; (4) Previous history of splenectomy; and (5) Missing data.

Figure 1
Figure 1 Flow diagram of patient inclusion. TIPS: Transjugular intrahepatic portosystemic shunt.
Data collection

The data involved in this study included: (1) Demographic data [age, gender, and body mass index (BMI)]; (2) Etiology [viral, alcohol, biliary, autoimmune hepatitis (AIH), and others]; (3) Laboratory examinations [white blood cell (WBC) count; platelet (PLT) count; international normalized ratio (INR); alanine aminotransferase (ALT); aspartate aminotransferase (AST); albumin (ALB); total bilirubin (TBIL); urea; and creatinine (CRE)]; (4) Liver cirrhosis scores [Child-Pugh[20] and model for end-stage liver disease (MELD)[21]]; (5) Imaging examinations [spleen volume, spleen length, liver volume, liver spleen volume ratio, portal vein blood flow velocity (PVV), portal vein diameter (PVD), spleen sound touch quantification (SSTQ), and spleen shear wave elastography (SSWE)]; (6) Hemodynamic examination [preoperative portal pressure gradient (PPG), postoperative PPG, PPG decrease value, and PPG decrease percentage]; and (7) Follow-up information: Presence or absence of HE, time of occurrence, and grade.

TIPS procedure

TIPS procedure was conducted as described previously[16]. All patients were implanted with an 8-mm-diameter poly-tetrafluoroethylene-covered stent (GORE VIATOOR).

Statistical analysis

The statistical analyses were performed using IBM SPSS (version 26.0) and GraphPad Prism (version 9.0). Continuous variables are expressed as the mean ± SD or median (interquartile range), and categorical variables as frequencies (proportions). The comparison between two groups was conducted using the two independent sample t-test, paired sample t-test, or Mann-Whitney U test. The χ2 test or Fisher’s exact test was used to compare categorical variables. The cumulative incidence of OHE after TIPS was compared using the Kaplan-Meier curve and the log-rank test. Cox regression model was used to evaluate the risk factors for OHE after TIPS. A restricted cubic spline model was utilized to evaluate the dose-response relationship. In all cases, two-sided P < 0.05 was considered statistically significant.

RESULTS
Baseline characteristics

This study included 135 patients with liver cirrhosis who underwent TIPS, with a mean age of 57.8 years. Of the 135 participants, 96 (59.6%) were male. Hepatitis B virus cirrhosis (32.2%) and alcohol-associated cirrhosis (14.9%) were the two most common etiologies of liver cirrhosis. At the time of TIPS, nearly 60% (57.1%) of the enrolled patients had Child-Pugh B liver function.

During the 1-year follow-up period, 37 (27.2%) enrolled patients experienced OHE after TIPS. Based on the severity of OHE, most of the patients were categorized to have West-Haven grade 2 (19 patients, 13.2%), followed by 8 patients (5.9%) with grade 3, and 11 (8.1%) with grade 4. The baseline demographic characteristics and clinical data are detailed in Table 1.

Table 1 Baseline characteristics of patients.
Parameter
All patients (n = 135)
Demographic characteristics
Age, yr57.8 ± 24.4
Gender, male96 (59.6)
BMI23.4 ± 9.4
Etiology
Viral (HAV/HBV/HCV)3/52/9 (1.8/32.2/5.5)
Alcohol24 (14.9)
Biliary15 (9.3)
AIH7 (4.3)
Others51 (31.7)
Scores
Child-Pugh stage (A/B/C)39/92/30 (24.2/57.1/18.6)
Child-Pugh score7.9 ± 1.8
MELD score13.6 ± 5.0
Imaging parameters
Spleen length, mm147.3 ± 29.1
Spleen volume, cm3853.0 ± 486.5
Liver volume, cm31125.0 ± 406.1
Liver/spleen volume2.0 ± 2.8
OHE during follow-up
OHE during follow-up37 (27.2)
OHE grade (2/3/4)18/8/11 (13.2/5.9/8.1)
Median months3
Laboratory parameters
WBC, 109/L3.8 ± 3.1
PLT, 109/L78.0 ± 66.0
INR2.0 ± 5.3
ALT, U/L29.1 ± 41.1
AST, U/L41.3 ± 71.7
ALB, g/L34.3 ± 23.9
TBIL, μmol/L35.2 ± 34.7
Urea, mmol/L7.3 ± 10.7
CRE, μmol/L81.4 ± 104.4
Relationship between spleen volume and post-TIPS OHE

Based on the median splenic volume, we divided the patients into two groups: High splenic volume group (≥ 784.2 cm3) and low splenic volume group (< 784.2 cm3). As shown in Table 2, compared with the high spleen volume group, more patients in the low spleen volume group had OHE (40.3% vs 22.1%, P < 0.05). The results of Kaplan-Meier curve analysis suggested that the incidence rate of OHE was higher in patients with low spleen volume (P < 0.05; Figure 2). In addition, there were statistical differences in BMI, WBC count, and PLT count between the two groups, while there were no statistical differences in indicators such as age, gender, etiology of liver cirrhosis, Child-Pugh class, MELD score, INR, ALT, AST, ALB, TBIL, urea, or CRE between the two groups.

Figure 2
Figure 2 Kaplan-Meier curves for cumulative incidence of overt hepatic encephalopathy in patients with cirrhosis after transjugular intrahepatic portosystemic shunt stratified by spleen volume. The patients was divided into two groups based on the median splenic volume (784.2 cm3). Log-rank test was used to compare the cumulative incidence of overt hepatic encephalopathy between the two groups. OHE: Overt hepatic encephalopathy.
Table 2 Comparison of population characteristics stratified by spleen volume.

Spleen volume ≥ 784.2 cm3 (n = 68)
Spleen volume < 784.2 cm3 (n = 67)
P value
Demographic characteristics
Age, yr61.52 ± 0.4257.07 ± 23.510.3427
Gender, male43 (31.9)36 (26.7)0.2625
BMI21.87 ± 4.3223.51 ± 3.49< 0.05
Etiology0.3532
Viral26 (38.2)25 (37.3)
Alcohol10 (14.7)10 (14.9)
Biliary7 (10.3)8 (11.9)
AIH3 (4.4)2 (3.0)
Others22 (32.4)23 (34.3)
Scores
Child-Pugh stage0.8530
A17 (25.0)16 (23.9)
B36 (53.9)38 (56.7)
C15 (22.1)13 (19.4)
Child-Pugh score8.07 ± 1.827.88 ± 1.820.5090
MELD score13.39 ± 4.3613.93 ± 5.570.5920
OHE during follow-up
OHE grade< 0.05
0/153 (77.9)40 (59.7)
27 (10.3)11 (16.4)
31 (1.5)9 (13.4)
47 (10.3)7 (10.4)
Laboratory parameters
WBC, 109/L3.11 ± 2.634.18 ± 2.99< 0.05
PLT, 109/L60.38 ± 57.9791.77 ± 67.64< 0.01
INR2.63 ± 8.051.56 ± 1.490.2941
ALT, U/L29.55 ± 36.8529.31 ± 51.220.9755
AST, U/L34.09 ± 33.1149.22 ± 105.000.2698
ALB, g/L37.69 ± 36.2431.80 ± 5.210.2000
TBIL, μmol/L30.53 ± 17.1341.71 ± 48.500.0845
Urea, mmol/L5.61 ± 2.949.42 ± 15.950.0734
CRE, μmol/L79.27 ± 82.3578.97 ± 106.400.9861

According to the West-Haven criteria, the severity of OHE was graded. We then compared the laboratory examination indicators and spleen measurement data between patients with different grades of OHE (Table 3 and Figure 3). The results showed that compared to non-OHE patients, those with high stage OHE (grades 3 + 4) had a smaller spleen volume (696.60 vs 901.30, P < 0.05). Compared with the preoperative value, spleen volume significantly decreased when OHE occurred after TIPS (Figure 4). The above results suggest that there is a close relationship between spleen volume and the incidence of OHE after TIPS, and preoperative low spleen volume is more likely to lead to post-TIPS OHE.

Figure 3
Figure 3 Comparison of spleen volumes among patients with different overt hepatic encephalopathy grades. The patients were divided in three groups based on overt hepatic encephalopathy (OHE) grade: Non-OHE (n = 99), OHE 2 (n = 18), and OHE 3/4 (n = 19). Quantitative data are presented as median (interquartile range). Mann-Whitney U test, aP < 0.05. OHE: Overt hepatic encephalopathy.
Figure 4
Figure 4 Comparison of spleen volumes pre- and post-transjugular intrahepatic portosystemic shunt. Paired t-test, aP < 0.05. TIPS: Transjugular intrahepatic portosystemic shunt.
Table 3 Comparison of laboratory data and imaging parameters by overt hepatic encephalopathy stage.

Non-OHE (n = 99)
OHE/2 (n = 18)
OHE/3+4 (n = 19)
P value
WBC, 109/L4.05 ± 3.442.51 ± 1.764.01 ± 2.440.1056
PLT, 109/L78.61 ± 68.2975.53 ± 75.3774.96 ± 50.930.9579
INR1.54 ± 1.391.38 ± 0.161.45 ± 0.230.8172
ALT, U/L27.16 ± 29.8417.29 ± 9.2245.81 ± 78.55< 0.05
AST, U/L35.91 ± 30.4226.66 ± 19.0774.35 ± 161.60< 0.05
ALB, g/L35.21 ± 29.0333.20 ± 4.8732.03 ± 5.720.8144
TBIL, μmol/L35.50 ± 39.8228.60 ± 23.4541.71 ± 31.000.4455
Urea, mmol/L7.10 ± 9.179.78 ± 21.026.00 ± 3.300.4998
CRE, μmol/L90.79 ± 127.2066.29 ± 17.3460.07 ± 16.120.3309
Spleen length, mm150.90 ± 27.74141.10 ± 35.44143.00 ± 27.090.2619
Spleen volume, cm3901.30 ± 471.90882.30 ± 704.60697.60 ± 281.00< 0.05
Liver volume, cm31120.00 ± 360.801070.00 ± 456.001153.00 ± 534.600.1891
Liver/spleen volume2.14 ± 3.072.59 ± 2.411.66 ± 1.080.5066
Spleen volume as an independent risk factor for post-TIPS OHE

To further determine that spleen volume is an important factor affecting the occurrence of OHE, we used a Cox regression model to evaluate whether spleen volume is an independent risk factor affecting the occurrence of OHE in Table 4. Univariate Cox regression analysis demonstrated that higher age [hazard ratio (HR) = 1.762 (1.043-3.230), P < 0.05] and lower spleen volume [HR = 0.537 (0.283-0.986), P < 0.05] of patients predicted the incidence of OHE. Multivariate Cox regression analysis suggested that lower spleen volume could be an independent risk factor for OHE after excluding other factors [HR = 0.494 (0.234-0.929), P < 0.05]. Next, we used a restricted cubic spline model to further confirm the correlation between spleen volume and increased OHE risk by assessing the dose-response relationship (Figure 5). The results showed that with increasing spleen volume, the curve of post-TIPS OHE risk followed a first rising and then decreasing trend (P < 0.05).

Figure 5
Figure 5 Correlation between spleen volume and post-transjugular intrahepatic portosystemic shunt overt hepatic encephalopathy. A restricted cubic spline model was used to evaluate the dose-response relationship. S_VOL: Spleen volume.
Table 4 Univariable and multivariable Cox regression analyses of risk factors for post-transjugular intrahepatic portosystemic shunt overt hepatic encephalopathy.
Univariable Cox
Multivariable Cox
HR (95%CI)
P value
HR (95%CI)
P value
Age (≥ 60 yr)1.762 (1.043-3.230)0.0491.473 (0.834-3.929)0.118
Gender0.854 (0.449-1.575)0.618
BMI (≥ 24.0)0.689 (0.331-1.329)0.288
Etiology (HBV)1.799 (0.945-3.321)0.065
Child-Pugh score1.259 (0.587-2.470)0.525
MELD score1.279 (0.682-2.482)0.451
Spleen volume0.537 (0.283-0.986)0.0490.494 (0.234-0.929)0.042
WBC, 109/L1.129 (0.616-2.095)0.696
PLT, 109/L0.936 (0.512-1.707)0.828
DISCUSSION

To the best of our knowledge, we for the first time found a significant correlation between spleen volume and OHE risk after TIPS. Patients with a smaller preoperative spleen volume have a higher risk of OHE post-TIPS, which is different from the report of OHE in cirrhosis[22]. Patel et al[22] reported that compared with the normal liver group, the spleen volume of patients with liver cirrhosis significantly increased, but there was no correlation between spleen size and HE. We speculate that the pathogenesis of OHE after TIPS may not be the same as that of OHE in cirrhosis.

To investigate the pathogenesis of OHE after TIPS, we included multiple potential influencing factors such as age, gender, BMI, and spleen volume in the univariate and multivariate Cox regression analyses. The results showed that age and spleen volume had statistical significance in univariate Cox regression analysis. In multivariate Cox regression analysis, spleen volume was identified to be the main influencing factor of OHE after TIPS. Previous studies on the relationship between the spleen and postoperative HE after TIPS have not been extensive. Liu et al[23] found that the combination of Child-Pugh score and quantitative CT spleen volume can predict postoperative OHE in TIPS. Chen et al[24] used three-dimensional models based on liver and spleen indicators to predict the risk of OHE after TIPS, providing guidance for patients undergoing TIPS. Thus, spleen volume may serve as an independent risk factor for postoperative OHE after TIPS.

To explore the reasons why changes in spleen volume can affect postoperative OHE in TIPS, we investigated the differences in portal vein components before and after TIPS, as well as among individuals with different spleen volumes. First, we analyzed the changes in the components based on laboratory testing. Comparing the relevant indicators of the same patient before and after TIPS, it was found that spleen volume significantly decreased after TIPS, which is consistent with literature reports[23]. This indicates that TIPS leads to a decrease in portal vein pressure, which in turn leads to a decrease in spleen pressure and changes in liver hemodynamics. The spleen, as an immune organ, may undergo changes in its inflammatory microenvironment due to changes in spleen volume and hardness[25]. In addition, some inflammation-related factors, such as IL-6[16], are closely related to HE after TIPS. Therefore, the impact of TIPS on the inflammatory microenvironment of the spleen may be one of the reasons for the occurrence of HE after TIPS. However, in our study, WBC count, PLT count, and other indicators related to immune inflammation did not show significant changes in OHE after TIPS surgery (Supplementary Table 1). This may indicate that changes in portal vein components due to changes in spleen volume are not the main cause of OHE after TIPS.

In addition to portal vein components, we also analyzed the changes in portal vein flow velocity[26,27] and spleen hardness[28,29]. We compared the PVV, PVD, SSTQ, and SSWE before and after surgery in patients with OHE after TIPS. The results showed that the PPV of the small-volume spleen group was significantly reduced, while PVD, SSTQ, and SSWE did not show significant changes (Supplementary Figure 1). Therefore, changes in portal vein flow velocity due to changes in spleen volume may be the main cause of OHE after TIPS. Based on this, unlike the traditional definitions of type B and type C OHE, we believe that postoperative OHE in TIPS tends to be a combination of type B and type C.

In addition, this study investigated the differences in spleen size and laboratory indicators among patients with OHE of different etiologies and severities of liver cirrhosis. The study found that there was no significant change in spleen volume among different etiologies (Supplementary Table 2) and severities of liver cirrhosis (Supplementary Tables 3 and 4). In addition to spleen volume, we also compared laboratory indicators. The results showed significant statistical differences in WBC count and PLT count among different etiologies, with a significant increase in AIH type. Compared with Child-Pugh A and B groups, Child-Pugh C group had the highest WBC count and TBIL (Supplementary Table 3). In the MELD grading, the cutoff value was 12, and the comparison results showed that there was no statistically significant difference in the indicators between patients with different MELD grades (Supplementary Table 4). The above results indicate that changes in spleen volume are not affected by the etiology and severity of liver cirrhosis, and there are differences in some laboratory indicators. There is no direct correlation between spleen volume and some indicators. It should be noted that some of the results are different from previous studies[30,31], perhaps mainly due to the inclusion of patients with portal hypertension who met the indications for TIPS.

The advantage of our research was that each case had complete preoperative clinical, laboratory, and imaging data. We also acknowledged the limitations of our research. First, this was a single center retrospective study without validation from a multicenter prospective cohort study. Second, some cases lacked immediate CT and laboratory examinations during the onset of HE after TIPS. Nevertheless, we believe that our research findings have clinical implications for post-TIPS OHE in patients with liver cirrhosis.

CONCLUSION

In conclusion, in a well-characterised patient population, we showed that spleen volume correlates significantly with post-TIPS OHE. Spleen volume can serve as an independent non-invasive predictor of OHE after TIPS.

Footnotes

Provenance and peer review: Unsolicited article; Externally peer reviewed.

Peer-review model: Single blind

Specialty type: Gastroenterology and hepatology

Country of origin: China

Peer-review report’s classification

Scientific Quality: Grade B

Novelty: Grade B

Creativity or Innovation: Grade B

Scientific Significance: Grade B

P-Reviewer: Popovic DD, Serbia S-Editor: Wang JJ L-Editor: Wang TQ P-Editor: Zhang L

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