Risk Factors for Death in Patients with Severe Acute Pancreatitis in Guizhou Province, China

Li, Jun; Gao, Jingyan; Huang, Min; Fu, Xiaoyun; Fu, Bao

doi:https://doi.org/10.1155/2024/8236616

Gastroenterology Research and Practice

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Abstract Introduction Methods Results Discussion Abbreviations Data Availability Ethical Approval Conflicts of Interest Authors’ Contributions Acknowledgments References Copyright Related Articles

Research Article | Open Access

Volume 2024 | Article ID 8236616 | https://doi.org/10.1155/2024/8236616

Risk Factors for Death in Patients with Severe Acute Pancreatitis in Guizhou Province, China

Jun Li,^1,2,3Jingyan Gao,^1,2Min Huang,^1,2Xiaoyun Fu ,^1,2and Bao Fu^1,2

Academic Editor: Chiara Ricci

Received09 Jan 2024

Revised11 Mar 2024

Accepted16 Mar 2024

Published01 Apr 2024

Abstract

Aim. To compare the clinical characteristics of survival and nonsurvival patients with severe acute pancreatitis (SAP) and explore the risk of mortality in SAP patients. Methods. This was a single-center retrospective study performed in a severe acute pancreatitis diagnosis and treatment center. According to the outcome, SAP patients were divided into survival group and nonsurvival group. One-way ANOVA or independent -test was used to compare the clinical characteristics of two groups of patients. Multivariate retrospective analysis was used to identify risk factors for mortality in SAP patients. Results. A total of 486 SAP patients were included in the study, and the 90-day mortality for SAP patients was 13.58%. The common etiologies of SAP are biliary tract diseases (69.75%) and hyperlipidemia (17.28%). The most common complications caused by SAP were organ failure (55.14%), ARDS (50.62%), AKI (30.45%), sepsis (27.16%), and abdominal fluid collection (27.57%). There were differences in age, complications, and medical intervention between the nonsurvival group and the survival group. The main causes of death were infection (46.97%), abdominal bleeding (28.79%), and organ failure (9.09%). The binary logistic regression analysis showed that there were significant differences in age, AKI, sepsis, abdominal hemorrhage, organ failure, laparotomy, creatinine, and APTT between the nonsurvival group and the survival group. Conclusion. Age, AKI, sepsis, abdominal hemorrhage, and organ failure are risk factors for mortality in SAP patients. SAP patients with high creatinine and prolonged APTT upon admission require doctors to be vigilant. The main cause of death in SAP patients is pancreatitis-related organ failure and secondary infection.

1. Introduction

Acute pancreatitis (AP) is one of the common acute abdominal diseases that requires hospitalization in clinical practice. Despite all efforts to make early diagnosis and timely treatment of AP, the mortality remains high, ranging from 2% to 9% [1–3]. The severity of AP varies from mild to severe and fatal. The mortality of severe acute pancreatitis (SAP) can reach up to 30% and needs to be managed in ICU [4, 5]. A previous study showed that the mortality at hospital discharge was different among various etiologies of SAP [6]. There was a significant correlation between early enteral nutrition (EN) and reduced in-hospital mortality in biliary pancreatitis, while age and mechanical ventilation requirements were associated with increased mortality [6]. A recent study [7] found that respiratory failure was the most common cause of death in patients with alcoholic pancreatitis. Another study has shown that AKI is independently associated with higher mortality rates in AP [8]. Therefore, there are differences in the risk factors for SAP mortality among various studies.

This study was conducted at a diagnosis and treatment center for severe acute pancreatitis in Western China, located in a plateau region with Castro landforms and underdeveloped economy. People in this area prefer high-fat and spicy diets, with a high morbidity of AP. The exploration of the clinical characteristics and risk factors for mortality of SAP patients in this region will help clinicians understand the clinical characteristics of SAP in Western China.

2. Patients and Methods

The study was conducted in the Department of Critical Care Medicine at the Affiliated Hospital of Zunyi Medical University. The department is the diagnosis and treatment center for severe acute pancreatitis in Guizhou Province. SAP patients admitted to the center from January 2018 to December 2022 were included in the study. Any data that may reveal the identity of the patient was concealed.

The general information and treatment data of the patients were extracted from the electronic medical record system. The diagnosis of AP and SAP refers to the Atlanta classification criteria revised in 2012 [9]. The diagnostic criteria for AP are as follows: (1) persistent abdominal pain; (2) serum amylase and/or lipase levels that are three times higher than the normal upper limit; and (3) typical characteristic manifestations of abdominal imaging. SAP is defined as the occurrence of sustained single or multiple organ failure greater than 48 hours on an AP basis, or a Marshall score greater than 2. According to the etiology, SAP patients were divided into 6 groups, including biliary tract disease, hyperlipidemia, alcohol, trauma, mixed factors, and idiopathic. The diagnosis of biliary pancreatitis is mainly based on abdominal ultrasound, CT scan, magnetic resonance imaging, or endoscopic retrograde cholangiopancreatography (ERCP) [10]. Alcoholic pancreatitis is defined as drinking more than 50 grams of alcohol per day for more than 5 years, or the patient drinking excessively shortly before the onset of the disease, with other possible causes excluded [10]. If gallstones and/or excessive alcohol consumption are excluded and serum triglycerides are above 1000 mg/dL, she/he will be considered as hyperlipidemic pancreatitis. Mixed causes are considered to be compatible with at least two causes simultaneously. Idiopathic acute pancreatitis refers to pancreatitis whose etiology has not been determined after comprehensive screening.

All patients underwent chest and abdominal computed tomography scans 48 hours after admission, and the laboratory examinations were completed within 24 hours of admission. This study did not limit the age of the patients. Patients with incomplete clinical data or patients transferred to another hospital for treatment were excluded. The patient’s data collection, etiology, and disease severity assessment were performed by two senior critical care physicians.

Continuous variables were shown as medians with interquartile ranges (IQR) or mean (standard deviation (SD)). Categorical variables were presented as percentages and compared using the chi-square test or Fisher’s exact test. For quantitative variables, we used the Student’s -test or the Mann–Whitney test. Multivariate retrospective analysis was used to assess risk factors for mortality in SAP patients, and was considered statistically significant. Statistical analyses were performed using SPSS software (version 18.0, IBM Corp, Armonk, NY, USA.) and GraphPad Prism 5 (Dotmatics, Bishop’s Stortford, UK).

3. Results

3.1. Comparison of Clinical Characteristics between Patients in the Survival Group and the Nonsurvival Group

A total of 486 SAP patients were included in the study, of which 420 survived and 66 (13.58%) died. There are 281 male, accounting for 57.82%. The proportion of males with alcoholic pancreatitis or hyperlipidemic pancreatitis is relatively high (Figure 1(a)). There was no significant difference in sex ratio between the survival group and the nonsurvival group (Table 1). The median age of all patients was 49 years old, and the median age of the patients in the nonsurvival group was greater than that in the survival group (56 vs. 46 years old, ). SAP patients were mainly distributed between the ages of 40-49 (18%), 40-59(26%), 60-69 (21%), and ≥70 years old (23%, Figure 1(b)). The common etiologies of SAP are biliary tract diseases (69.75%) and hyperlipidemia (17.28%). There was no significant difference in the etiology between the nonsurvival group and the survival group. The common comorbidities of SAP patients were hypertension and diabetes, and the morbidity of diabetes in the nonsurvival group was higher than that in the survival group (30.30% vs. 19.05, , Table 1). There was no difference in unhealthy lifestyle habits between the two groups of patients.

(a)

(b)

(c)

(d)

The most common complications caused by SAP were ARDS (50.62%), AKI (30.45%), sepsis (27.16%), and abdominal fluid collection (27.57%). The incidence of ARDS, AKI, sepsis, septic shock, organ perforation, intra-abdominal hemorrhage, fluid collection, and ACS in the nonsurvival group was higher than that in the survival group (Table 1).

The incidence of organ failure (50.00% vs. 87.88%, ) and infected pancreatic necrosis (23.10% vs. 43.94%, ) in the nonsurvival group was higher than that in the survival group (Table 1). Patients in the nonsurvival group required more medical interventions, including mechanical ventilation, vasopressin use, percutaneous puncture drainage, laparotomy, and blood product infusion.

3.2. Comparison of Laboratory Examinations between Patients in the Survival Group and the Nonsurvival Group

The leukocyte, neutrophil, and platelet counts in the nonsurvival group were lower than those in the survival group ( vs. , ; vs. , ; 116.50 (85.00, 190.00) vs. 163.00 (122.00, 217.00), ). The serum ALT and total bilirubin levels of patients in the nonsurvival group were higher than those in the survival group (40.00 (20.00, 148.00) vs. 23.00 (14.00, 50.00), ; 24.80 (16.90, 64.65) vs. 19.50 (13.70, 30.10), , Table 2). The serum creatinine and LDH of patients in the nonsurvival group were higher than those in the survival group (162.00 (78.50, 259.00) vs. 68.00 (52.00, 99.00), ; 635.50 (333.50, 1419.75) vs. 374.00 (245.00, 539.00), ). In terms of coagulation function, APTT was higher in the nonsurvival group than that in the survival group (48.10 (36.90, 69.55) vs. 36.25 (30.20, 44.00), ), while PTA was lower in the survival group (77.10 (49.40, 96.90) vs. 97.00 (80.88, 111.50), ). The Ranson score of patients in the nonsurvival group was higher than that in the survival group ( vs. , , Table 2).

3.3. Binary Logistic Regression Analysis of Differential Indicators between the Two Groups of Patients

We further conducted binary logistic regression analysis on the indicators with differences between the two groups, and the results showed significant differences in age (OR 1.060, 95% CI 1.032-1.088, ), sepsis (OR 0.147, 95% CI 0.067-0.324, ), intra-abdominal hemorrhage (OR 0.263, 95% CI 0.096-0.720, ), laparotomy (OR 6.311, 95% CI 1.793-22.207, ), organ failure (OR 0.124, 95% CI 0.052-0.297, ), creatinine (OR 1.003, 95% CI 1.001-1.006, ), and APTT (OR 0.018, 95% CI 1.004-1.032, ), as shown in Table 3. Multivariate analysis of other variables showed . The forest map of the relationship between various variables and 90-day mortality was shown in Figure 1(c).

3.4. The Receiver Operating Characteristic Curve Comparisons of Different Parameters in Predicting 90-Day Mortality

We further evaluated the role of these parameters in predicting the 90-day mortality of SAP patients. These variables in this study were used to predict the mortality of SAP patients, and the AUC were all less than 0.8 (Figure 1(d) and Table 4).

3.5. Analysis of Death Causes of SAP Patients

A total of 66 patients died in this study. The specific causes of death were as follows: infection in 31 cases (46.97%), abdominal bleeding in 19 cases (28.79%), cerebrovascular accident in 4 cases (6.06%), heart disease in 2 cases (3.03%), gastrointestinal perforation in 2 cases (3.03%), mesenteric artery embolism in 2 cases (3.03%), and organ failure in 6 cases (9.09%) (Figure 2).

4. Discussion

The study investigated the etiology, severity, and mortality of 486 patients with SAP in Western China. Previous reports have shown that gallstones and alcohol are the most common causes of AP in China [11–13]. In the study, gallstones remained the primary cause of AP, which is consistent with the previous reports [10, 14]. However, the second leading cause of AP in our study was not alcohol, but hyperlipidemia. This result is inconsistent with the reports from other regions in China [11, 13]. We speculate that this difference may be related to the dietary habits of Guizhou Province. Guizhou Province is located in Western China, with a humid and rainy climate. Local people enjoy high-fat and spicy diets. A study in 2017 also showed that the incidence of hyperlipidemic pancreatitis in China has increased year by year [10]. This phenomenon requires the vigilance of clinical doctors and strengthening health education. In the study, there was no significant difference in the etiology between the survival group and the nonsurvival group. Previous studies also have not found a correlation between the etiology and outcome of AP [15, 16].

In the study, SAP patients were mainly distributed in the population over 40 years old. This result may be related to the fact that all patients included in this study were SAP patients. Furthermore, previous studies showed that the incidence rate of biliary pancreatitis usually increased with age [17–19]. In addition, elderly patients may be more likely to progress to SAP [10]. Our study also showed that patients in the nonsurvival group were older than those in the survival group, and multivariate analysis suggested that age is a risk factor for mortality. When suffered from the same level of stress, elderly people are more prone to organ failure and difficult to recover. There was no significant difference in the sex ratio between the nonsurvival group and the survival group. Therefore, gender may not be a risk factor for the severity of SAP patients’ condition and mortality.

The 90-day mortality of SAP patients in this study was 13.58%, similar to a previous study (11.1%) [5]. The incidence of complications in patients in the nonsurvival group was significantly higher than that in the survival group, such as ARDS, AKI, sepsis, abdominal hemorrhage, fluid collection, and ACS. The mortality of AP patients with MODS increases more than 100 times [20]. This study also showed that the incidence of organ failure in the nonsurvival group was higher than that in the survival group. Further analysis showed that organ failure was an independent risk factor for death in SAP patients, which was consistent with the previous reports [21]. In addition, necrosis and infectious necrosis are significantly correlated with an increase in AP mortality rate [4, 21]. This study showed that the incidence of infectious pancreatic necrosis in the nonsurvival group was higher than that in the survival group. However, the multivariate analysis did not show that it was an independent risk factor for death in SAP patients, which is different from a previous report [21]. This difference may be related to the fact that all the patients we included were SAP and the number of dead patients was less.

Due to the higher incidence of complications in the nonsurvival group compared to the survival group, patients in the nonsurvival group received more medical interventions, such as mechanical ventilation, vasopressin, percutaneous drainage, laparotomy, and blood transfer products. Regression analysis showed that laparotomy was associated with death. The reason for this result is that SAP patients who need open surgery are more critically ill. There has been substantial evolution of strategies for interventions in recent years, from open surgery to minimally invasive surgical and endoscopic step-up approaches [22]. In clinical practice, there are still some patients who have to undergo open surgery because of their condition.

This study showed that the white blood cell count, neutrophil count, and platelet count of patients in the nonsurvival group were lower than those in the survival group, while ALT, total bilirubin, creatinine, and LDH were higher than those in the survival group. In terms of coagulation function, APTT and TT were higher in the nonsurvival group than those in the survival group, while PTA was lower in the survival group. A multivariate retrospective analysis showed that only APTT and creatinine showed differences between the two groups. A recent retrospective study showed that in multivariate regression, APTT was also found to be a risk factor for death in AP patients [23]. In dogs with AP, serum μmol/L was associated significantly with poor prognosis [24]. Multivariate analysis of a previous study has determined that creatinine, glucose, and pleural fluid at admission are independent risk factors associated with postdischarge mortality in AP patients [25]. A multivariate logistic regression indicated that blood urea nitrogen and serum creatinine at 24 hours after hospitalization were independently associated with SAP [26]. Therefore, these results suggest that we should pay attention to the levels of APTT and serum creatinine at the time of admission in SAP patients. When these differential variables were used to predict the mortality of SAP patients, the AUC were all less than 0.8. This result indicates that a single variable does not perform well in predicting mortality in SAP patients. Imaging combined with other variables may perform better in predicting outcomes of SAP patients.

The three main causes of death in SAP patients in this study were infection, abdominal bleeding, and organ failure. Similarly, a previous study showed that the main causes of death in AP patients were organ failure and infectious diseases [27]. A recent study suggests that respiratory failure is the main cause of AP patient death [7]. Previous studies have shown that splenic artery, portal vein, spleen, and peripancreatic vessels are the most common sources of bleeding in AP, with associated mortality rates of 33.3%, 50.0%, 30%, and 28.5%, respectively [28]. Organ failure and infection can also increase the risk of bleeding. Therefore, the main cause of death in SAP patients is pancreatitis-related organ failure and secondary infection.

The limitations of this study are as follows: firstly, it is a single-center study, and the sample size of nonsurvival patients is small, which may lead to no statistical difference in some independent risk factors of death, such as infectious pancreatitis necrosis. Secondly, the laboratory examination results of this study were obtained at the time of patient admission and did not undergo continuous observation. Perhaps, the trend of changes in these variables is better than a single time point in predicting patient prognosis. Thirdly, as this study was a retrospective analysis, some infection indicators were not routinely checked, so important inflammatory indicators such as IL-6 and procalcitonin were missed. Finally, the patients included in this study are SAP patients admitted to ICU, which may lead to selection bias. In addition, our hospital is a referral center, and the SAP patients included are critically ill, which may also lead to selection bias. This selection bias may lead to the results of this study not applicable to all AP patients.

In conclusion, age, sepsis, abdominal hemorrhage, and organ failure are risk factors for death in SAP patients. Patients with SAP who underwent open surgery had a higher mortality rate. SAP patients with high creatinine and prolonged APTT upon admission require doctors to be vigilant. Age, sepsis, organ failure, abdominal hemorrhage, laparotomy, creatinine, and APTT did not perform well in predicting mortality in SAP patients.

Abbreviations

SAP:	Severe acute pancreatitis
AP:	Acute pancreatitis
ARDS:	Acute respiratory distress syndrome
AKI:	Acute kidney injury
ACS:	Abdominal compartment syndrome
CRRT:	Continuous renal replacement therapy
ALT:	Alanine aminotransferase
AST:	Aspartate transaminase
LDH:	Lactic dehydrogenase
APTT:	Activated partial thromboplastin time
TT:	Thrombin time
PTA:	Prothrombin activity prothrombin time activity
CRP:	C-reactive protein
ROC:	Receiver operating curve
AUC:	Area under curve.

Data Availability

All data generated or analysed during this study are included in this published article.

Ethical Approval

This study was approved by the Ethics Committee of the Affiliated Hospital of Zunyi Medical University (Protocol No. KLL-2021-002) and was conducted according to the principles of the Declaration of Helsinki. Due to the retrospective study design, written informed consent was waived (Ethics Committee of the Affiliated Hospital of Zunyi Medical University).

Conflicts of Interest

The authors have no conflict of interest to disclose.

Authors’ Contributions

BF and XYF designed the research, conducted the literature search and analyses, and wrote the first draft of the paper. MH conducted the literature screening. JYG checked the data extractions for accuracy. JL and JYG collected the data. BF takes responsibility for the integrity of the data and the accuracy of the data analysis. Jun Li and Jingyan Gao are the co-first authors.

Acknowledgments

This research was funded by the National Natural Science Foundation of China (No. 82360138). The authors would like to thank Professor Kunming Tian of Zunyi Medical University for his statistical assistance.

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Copyright © 2024 Jun Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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