1. Introduction
Acute variceal bleeding (AVB) represents a major complication of portal hypertension and a leading cause of upper gastrointestinal bleeding (UGIB). Mortality is estimated at approximately 15–20% [
1,
2] and is often correlated with the severity of the disease, most frequently assessed based on Child–Pugh and MELD scores [
3]. Treatment of AVB includes band variceal ligation for esophageal variceal and type I gastroesophageal varices (GOV) bleeding and obliteration with cyanoacrylate for type II GOV and isolated gastric varices, together with vasoactive treatment (preferably initiated before endoscopy) and prophylactic antibiotherapy [
4,
5,
6]. A Sengstaken–Blakemore tube can be of temporary utility in cases of endoscopic failure. Salvage TIPS (Transjugular Intrahepatic Porto-systemic Shunt) or stent placement may be used in refractory AVB, and current guidelines recommend early TIPS in patients with Child scores B or C and active variceal bleeding at the time of endoscopy [
3]. Despite these recommendations, access to TIPS varies across different countries.
Several prognostic scores have been proposed for predicting mortality, rebleeding, the need for intervention, and intensive care unit admissions [
7]. The Glasgow–Blatchford score (GBS) and Rockall scores (clinical and full) are the most widely used scores for non-variceal bleeding; a more effective score for cirrhotic patients with bleeding is the AIMS65, proposed by Saltzmann in 2011, because it includes items such as albumin level, INR, and altered consciousness [
8]. However, AVB prognosis is more often related to the severity of liver failure (reflected by the values of Child–Pugh–Turcotte or MELD score); the authors of the majority of studies have concluded that the accuracy of classical scores in variceal bleeding is inferior compared to that in non-variceal bleeding. A meta-analysis including 28 studies found that the Child–Turcotte–Pugh (CTP) score provides greater accuracy than classical prognostic scores (AIM65, GBS, and Rockall score) [
9], with the MELD score noted as superior to the CTP score in some studies [
10,
11,
12,
13]. Most classical scores (excluding AIM65) do not include parameters associated with liver failure, which may alter the accuracy of AVB assessment. Some variants of the CTP and MELD scores (such as creatinine-CTP, MELD-3, MELD-Na, and UKELD) can be used for risk assessment [
14]. A general prognostic score for assessing patients with UGIB is represented by the Charlson comorbidity index (CCI), which includes the presence of associated comorbidities and advanced age [
15]. A major limitation of prognostic scores in AVB is the fact that classical prognostic scores reflect only bleeding severity (excluding albumin level in AIMS65), whereas liver failure scores (CTP and MELD) are not correlated with bleeding severity. Several studies assessing the accuracy of prognostic scores are summarized in
Table S1.
The neutrophil-to-lymphocyte ratio (NLR) reflects an altered ratio between neutrophils (which stimulate inflammation via several cytokines) and lymphocytes (which correlate with immunoregulatory mechanisms) [
16,
17,
18]. The authors of several published studies and meta-analyses have evaluated the importance of NLR in the outcome prediction of patients with acute pancreatitis, severe burns, ischemic and hemorrhagic stroke, myocardial infarction, venous thromboembolism, sepsis, COVID-19 pneumonia, and cancer [
16,
19,
20,
21,
22,
23,
24,
25,
26,
27,
28,
29,
30,
31], in addition to the risk of metabolic syndrome and MAFLD [
32,
33], cardiac surgery complications [
34], encephalopathy [
35], TIPS and virus C-cirrhosis complications [
36,
37]. Most studies regarding NLR and bleeding focus on intracerebral hemorrhage; in the acute phase, an increase in total leucocyte, monocyte, and granulocyte counts is recorded, combined with a reduction in lymphocyte count, and negative regulatory T cell levels decrease in the early phase of intracerebral bleeding, suggesting impaired control of inflammation by the immune system. High NLR levels are associated with gastrointestinal bleeding risk in patients with basal ganglia hemorrhage [
22]. In patients with an unfavorable prognosis, CD3+ and CD3+CD4+ T lymphocyte counts are lower at an early stage following intracerebral hemorrhage [
23]. Gastrointestinal bleeding can cause an inflammatory response, and peripheral blood inflammation may be associated with disease outcome [
18]. Persistent lymphopenia appears more frequently in acute-onset diseases and may be induced by progressive inflammation; in comparison, increased neutrophil counts may be noted in acute bleeding and SIRS [
16,
17]. NLR levels can be increased through the use of corticosteroids (which increase neutrophil levels and may decrease lymphocyte counts); in comparison, dehydration can decrease both neutrophil function and lymphocyte counts. Thus far, only a few research groups have assessed the predictive role of NLR in mortality and rebleeding in acute gastrointestinal bleeding [
17,
18,
24,
38,
39], with higher NLRs associated with mortality risk [
17,
18] and rebleeding risk [
24].
The objective of our study was to evaluate the prognostic role of NLR as compared to classical scores (GBS and modified GBS, CRS, FRS, AIMS65, Charlson comorbidity index, or CI), liver failure scores (CTP, CTP-creatinine, MELD, MELD-3, and UKELD), and several new scores (ALBi and PALBi) for assessing mortality and early rebleeding risk.
2. Materials and Methods
We performed a retrospective study including all patients with acute variceal bleeding and cirrhosis admitted to the Emergency Clinical Hospital Craiova between 1 January 2017, and 31 December 2021. We collected data from the hospital’s Hippocrate computerized system, and the analysis of medical records was subsequently performed to exclude patients with non-variceal or lower gastrointestinal bleeding. We searched all patients aged over 16 years admitted for hematemesis, melena, gastrointestinal bleeding, or esophageal varices with bleeding (ICD-10 codes K92.0, K92.1, K92.2, and I85.0) with concomitant liver cirrhosis or chronic liver failure (ICD-10 codes K70, K72, K74). The results of laboratory analyses completed upon admission were collected. Inclusion criteria comprised acute variceal bleeding confirmed by endoscopy in patients with cirrhosis, confirmed by typical clinical and laboratory data and ultrasound results. Patients aged younger than 16 years, with non-cirrhotic variceal bleeding, with BCLC stage D hepatocellular carcinoma or stage IV carcinomas in other locations (due to high non-bleeding related mortality), and those with missing data were excluded. All patients signed an informed consent form for the use of their personal data. The protocol was approved by the Local Ethics Committee (approval number 11977; 24 March 2020).
The standard therapy for AVB included Terlipressin treatment for 3–5 days, saline and glucose solutions, 80 mg/day proton pump inhibitors, prophylactic antibiotherapy, and correction of clotting disorders in selected cases; cases exhibiting hemodynamic instability were managed through the use of a Sengstaken-Blakemore tube before endoscopy. Blood transfusions were recommended with a target hemoglobin value of 8 g/dl. Endoscopy was performed during the first 24 h of admission; variceal band ligation was used for esophageal varices or GOV1 (gastroesophageal varices). Cases with immediate failure were treated with Sengstaken-Blakemore tube placement, with endoscopy repeated during the first 24 h. For large varices or those with red signs, no active bleeding, and no white nipple, variceal band ligation was also performed if no other lesions were found upon endoscopy. Following endoscopy, all patients were closely monitored for continued or early recurrent bleeding (new onset of hematemesis, hematochezia, or melena accompanied by hemodynamic instability or hemoglobin decline of more than 3 g/dl) [
5,
6]; a new endoscopic hemostatic procedure is indicated in cases of recurrent bleeding. In cases with persistent bleeding, the Sengstaken-Blakemore tube was used.
The main outcomes in patients with acute variceal bleeding were early mortality, 6-week mortality, and early rebleeding. Because some patients with variceal bleeding can develop extensive bleeding accompanied by early death, 48 h, 5-day, and in-hospital mortality were assessed in our study, combined with 6-week mortality and early rebleeding; classical prognostic scores (CRS, FRS, GBS, modified GBS, and AIMS65), CTP and MELD scores, new scores (ALBi and PALBi) and the NLR value were analyzed to assess their predictive value (
Tables S2–S7) [
10,
13,
40,
41]. For MELD, we used the formula MELD = 9.57 * ln (Serum Cr) + 3.78 * ln (Serum Bilirubin) + 11.20 * ln (INR) + 6.43, rounded to the nearest integer [
10,
13,
14,
40,
41].
Statistical analyses were performed using Microsoft Excel (Microsoft Corp., Redmond, WA, USA), with XLSTAT 2016 add-on for MS Excel (Addinsoft SARL, Paris, France) and IBM SPSS Statistics 20.0 (IBM Corporation, Armonk, NY, USA). Descriptive data were generated for the patients’ characteristics, including percentages for categorical variables and means with standard deviations for continuous variables. For continuous variables, the Mann–Whitney test was used to assess the differences between groups, while differences regarding proportions between groups were evaluated using the Chi-square test. We performed univariate and multivariate logistic analyses for factors associated with mortality, including, in the multivariate model, factors identified through univariate logistic regression analysis with p < 0.2.
3. Results
A total of 415 patients with AVB were included in the analysis; the median age was 58.2 ± 10.9 years, and nearly 2/3 were male. Esophageal varices caused 92.1% of AVB cases; thirty-two cases of bleeding gastric varices and one case of bleeding jejunal varices were noted. Most patients were classed as Child B (54.7%) and C (26.1%). Alcoholic etiology was the most frequent cause (77.8%). The most frequent complication was hepatic encephalopathy (20.7%); hepatocellular carcinoma and portal vein thrombosis were noted in 5.1% and 3.9% of patients, respectively. In-hospital mortality for all patients was noted as 15.7%, and 6-week mortality was noted as 23.1%; for Child C class patients, in-hospital and 6-week mortality were noted as 27.2% and 41.7%. The early rebleeding rate in our cohort was 8.1% (
Table 1).
The accuracy of prognostic scores was evaluated by constructing the area under the curve (AUC) and 95% confidence interval (95% CI) for mortality prediction (
Table 2 and
Table 3,
Figure 1A–H).
For 48 h mortality prediction, the most accurate scores were MELD-3 (AUC 0.808, 95% CI 0.694–0.922), MELD (AUC 0.807, 95% CI 0.697–0.916), MELD-Na (AUC 0.793, 0.676–0.910), and ALBi (AUC 0.792, 95% CI 0.680–0.903), followed by NLR (AUC 0.718, 95% CI 0.597–0.839), CTP-creatinine (AUC 0.693, 95% CI 0.558–0.828), PALBi (AUC 0.692, 95% CI 0.569–0.815), CTP (AUC 0.689, 95% CI 0.554–0.824), AIMS65 (AUC 0.673, 95% CI 0.546–0.800), and UKELD (AUC 0.671, 95% CI 0.541–0.801); all other classical prognostic scores, excluding AIMS65, exhibited low accuracy (AUC below 0.61 for GBS, mGBS, CRS, and FRS). For 5-day mortality, a similar classification of predictive value but with lower accuracy was noted; the most accurate scores were MELD (AUC 0.769, 95% CI 0.680–0.859), MELD-3 (AUC 0.762, 95% CI 0.667–0.857), ALBi (AUC 0.752, 95% CI 0.661–0.843), and MELD-Na (AUC 0.749, 95% CI 0.653–0.845), followed by CTP-creatinine (AUC 0.701, 95% CI 0.600–0.803), CTP (AUC 0.701, 95% CI 0.59–0.799), NLR (AUC 0.672, 95% CI 0.574–0.770), UKELD (AUC 0.671, 95% CI 0.569–0.773), AIMS65 (AUC 0.654, 95% CI 0.555–0.752), and PALBi (AUC 0.650, 95% CI 0.553–0.747). The same trend was noted for in-hospital and 6-week mortality; for in-hospital mortality, the most accurate scores were ALBi, MELD-Na, MELD-3, MELD, AIMS65, CTP-creatinine, CTP, NLR, and PALBi; in comparison, for 6-week mortality, the most accurate scores were ALBi (AUC 0.708, 95% CI 0.646–0.769) and MELD-Na (AUC 0.700, 95% CI 0.637–0.764), followed by MELD-3 (AUC 0.692, 95% CI 0.628–0.757), CTP-creatinine (AUC 0.682, 95% CI 0.617–0.747), UKELD (AUC 0.672, 95% CI 0.607–0.737), MELD (AUC 0.666, 95% CI 0.602–0.730), CTP (AUC 0.652, 95% CI 0.585–0.718), AIMS65 (AUC 0.643, 95% CI 0.578–0.708), and NLR (AUC 0.619, 95% CI 0.554–0.684); classical scores exhibited a lower accuracy (AUC below 0.61), although statistical significance was attained for the modified GBS, GBS, and FRS.
For NLR, the cutoff values, sensitivity, specificity, and accuracy were 5.875, 82.6%, 62.7%, and 63.8% for 48 h mortality, 4.574, 77%, 49.6%, and 53.6% for in-hospital mortality, and 4, 80.6%, 45.3%, and 54.1% for 6-week mortality. All scores demonstrated poor predictive value for early rebleeding, with none having an AUC above 0.6 (
Table 4,
Figure 2A,B).
We performed univariate and multivariate analyses of clinical and laboratory parameters associated with 48 h and 6-week mortality (
Table 5 and
Table 6), followed by logistic regression to obtain the most accurate model.
Next, we constructed new models for predicting 48-h and 6-week mortality based on the variables with
p < 0.2 in univariate logistic regression models, including the NLR and categorical and numerical parameters, but excluding scores such as MELD, CTP, ALBi, or PALBI. A final model for mortality prediction was subsequently obtained for 6-week mortality, with sufficient accuracy and specificity and lower sensitivity, but fewer factors, and fairly good correctness; for 48-h mortality, the sensitivity was good; however, the specificity was poor (
Table 7,
Table 8,
Table 9 and
Table 10).
4. Discussion
NLR is associated with the severity of inflammation and may identify cirrhotic patients at increased risk of mortality and readmissions for hepatic encephalopathy [
35]. It has also been shown to have a positive correlation with CTP score and be of independent predictive value for survival [
35,
37]. Because NLR is correlated with the level of inflammation, it may increase in parallel with the severity of encephalopathy symptoms by increasing the neurotoxicity induced by ammonia through the blood–brain barrier [
35]. Both higher neutrophil count and lower lymphocyte count were noted in decompensated cirrhotic patients compared to those with compensated disease [
35]. The NLR can increase in patients with gastrointestinal bleeding because of associated inflammation and high neutrophil counts [
17,
18]. NLR values may be influenced by age, the etiology of cirrhosis, and the presence of diabetes [
37], thus complicating the search for an ideal cutoff [
37]. In our study, the NLR demonstrated fairly good prognostic value for 48 h mortality; however, the simplified model primarily predicted 48 h survival. The NLR predictive value decreased from short-term to medium-term survival (AUC 0.718, 95% CI 0.597–0.839 for 48 h mortality, 0.672, 95% CI 0.574–0.770 for 5-day mortality, 0.631, 95% CI 0.551–0.711 for in-hospital mortality, and 0.619, 95% CI 0.554–0.684 for 6-week mortality). The accuracy of NLR was superior to that of classical prognostic factors (GBS, mGBS, CRS, and FRS) and similar to AIMS65, with the AUC for NLR slightly superior to AIMS65 for both 48 h and 5-day mortality but marginally inferior for in-hospital and 6-week mortality. In a study on patients with both non-variceal and AVB, the AUC for in-hospital mortality was 0.640 for NLR, 0.662 for GBS, 0.747 for FRS, 0.687 for NLR-GBS, and 0.763 for NLR-FRS [
18].
In our study, the accuracy of classical prognostic scores (clinical and full Rockall scores, GBS, and modified GBS) was poor for all analyzed outcomes (in-hospital and 6-week mortality and early rebleeding), with no significant differences between scores; in all of these cases, the AUC was below 0.6. The accuracy of classical prognostic scores in predicting mortality and other clinical outcomes in AVB is considered inferior compared to non-variceal UGIB [
10,
14,
40,
42,
43] because the mortality rate in AVB is more closely related to the severity of liver failure than the severity of bleeding [
44]. In several studies comparing classical scores and those evaluating liver failure, the AUC for the Rockall score ranged from 0.533 and 0.834, with values below 0.7 in [
40,
42,
43,
45,
46,
47], values between 0.7 and 0.8 in [
10,
44,
45,
48,
49], and values above 0.8 in [
50,
51]. In the literature, AUC values for the Glasgow–Blatchford score between 0.56 and 0.781 have been recorded. Values below 0.7 have been noted in some studies [
40,
42,
43,
44,
45,
47]; in comparison, the authors of other studies have reported AUC values between 0.7 and 0.8 [
46,
48,
50,
52,
53], and no study authors have reported an AUC above 0.8. For the AIMS65, the prognostic value in our study was slightly better than GBS, mGBS, CRS, and FRS, with AUC values of 0.673, 0.672, and 0.643 for 48 h, in-hospital, and 6-week mortality. In the literature, values between 0.525 and 0.97 have been reported in several studies, with values below 0.7 in [
14,
40,
42,
43,
45], values between 0.7 and 0.8 in [
47,
50], and values above 0.8 in [
10,
13,
46,
48,
49,
53,
54,
55]. In most studies, AIMS65 (which incorporates albumin level and an indicator of liver failure) appears to be superior to the Rockall score or GBS [
10,
43,
45,
46,
47,
48,
49,
53]; few studies have demonstrated the superiority of both RS and GBS, however [
42,
50].
In our study, MELD, MELD-3, and MELD-Na demonstrated superior accuracy compared with CTP and CTP-creatinine scores in predicting short- and medium-term mortality. Both MELD and CTP scores were superior to classical prognostic scores and AIMS65. In most studies, CTP and MELD appear to be superior to classical scores in assessing mortality risk [
10,
14,
40,
45,
52,
56]; similar levels of accuracy have been reported in other studies [
50]. In comparison, in two other studies, AIMS65 was superior to CTP and MELD in predicting both in-hospital and 6-week mortality [
46,
54] but demonstrated no differences in terms of performance compared to MELD-Na [
46]. In the literature, the values of AUC for CTP score have been estimated to be between 0.668 and 0.9, with values below 0.7 reported in one study [
57], values between 0.7 and 0.8 reported in some studies [
9,
12,
45,
46,
49,
58,
59,
60], and values above 0.8 reported in others [
14,
40,
43,
48,
50,
52,
54,
56,
61,
62,
63,
64,
65,
66]. For MELD score and variants, the AUC was estimated between 0.688 and 0.88, with values below 0.7 in [
14,
43,
57], between 0.7 and 0.8 in [
9,
40,
45,
46,
58,
59,
62,
63,
64,
65,
66,
67,
68], or above 0.8 in [
10,
11,
12,
13,
48,
52,
54,
55,
56,
60,
61]. Direct comparison between CTP and MELD has shown conflicting results; in some studies, CTP was superior [
14,
40,
43,
51,
65] or exhibited similar results [
9,
45,
46,
48,
49,
50,
52,
54,
56,
57,
58,
59,
61,
62,
63,
64,
65,
69]; in comparison, in other studies, CTP was proven inferior to MELD [
10,
11,
12,
13]. In a systematic review and meta-analysis, the AUC for predicting in-hospital mortality was 0.824 for CTP, 0.9793 for AIMS65, 0.788 for MELD, 0.75 for the full Rockall score, and 0.683 for GBS, with CTP having the highest sensitivity and AIMS having the highest specificity; for follow-up mortality, MELD appears to be superior to CTP, with an AUC of 0.798 for MELD, 0.77 for AIMS65, and 0.746 for CTP; in comparison, the values for full Rockall score and GBS were below 0.7 (because they did not include an assessment of liver failure) [
1]. Some new proposed scores, such as ALBi (albumin–bilirubin), PALBi (platelet–albumin–bilirubin), or CAGIB (diabetes, hepatocellular carcinoma, albumin, bilirubin, and creatinine), have also been proposed in some studies [
13,
57,
62,
63,
64,
65,
66,
67,
68,
69,
70]; in our study, ALBi, but not PALBi, demonstrated good prognostic value, close to the MELD variants.
The value of all scores in predicting early rebleeding was poor in our study, with the highest value for NLR. In one published study, NLR and PLR increased in AVB patients who suffered rebleeding; the AUC for rebleeding was 0.7037 for NLR and 0.7468 for PLR [
39]. Although we did not find good predictive value for NLR in early rebleeding, the fact that NLR had the highest score for the prediction of early rebleeding seems encouraging and warrants further analysis in future studies.
In our study, the accuracy of all scores decreased for medium-term prognosis, with high AUC values of 0.700 and 0.708 for MELD-Na and ALBi only. Classical scores (Rockall and GB scores) do not include an assessment of the degree of liver failure; in comparison, CTP and MELD scores are focused only on the severity of liver failure and not the severity of bleeding. Our simplified model (NLR, age, creatinine, bilirubin, albumin, INR, platelet count, HCC presence, and etiology) can be of utility in predicting 6-week mortality, with excellent survival prediction accuracy (94.14%) but only weak mortality prediction accuracy (41.41%). In-hospital mortality prediction accuracy was poor, however, because only the survival prediction was accurate (99.46%), whereas the mortality prediction was highly inaccurate (9.09%). In the literature, some nomograms for MELD or CTP have been proposed to improve the accuracy of prognostic scores [
71,
72,
73,
74,
75,
76,
77,
78,
79,
80]; however, challenges may be encountered in clinical applications because of complicated formulas.
Several limitations of the current study should be noted. The small number of patients, combined with the monocentric and retrospective nature of the study, significantly limits the generalizability of our findings; larger or multicenter studies will be necessary for external validation and improved data accuracy. All scores had mild specificity, while sensitivity was high in most scores. No score was found to be highly accurate for the analyzed outcomes (excluding MELD in 48 h mortality analysis); the prediction of early rebleeding was particularly inaccurate. Early or salvage TIPS is not available at our center, which may have impacted both mortality and rebleeding. Subgroup analysis related to esophageal or gastric variceal bleeding was not possible because of the small number of gastric varices cases. Future studies analyzing the role of NLR and other simple hematological parameters for the prognosis of variceal and non-variceal bleeding, possibly in combination with other factors, may help to accurately predict both mortality and rebleeding and also more effectively manage patients with severe bleeding and hemodynamic instability.