AP is a disease that causes acute inflammation of the pancreas due to the activation of pancreatic enzymes by multiple triggers, which can lead to local damage and systemic inflammatory reactions. Gallstones and heavy alcohol consumption are the two most common causes [14]. According to the severity, AP patients can be divided into three types: mild acute pancreatitis (MAP), moderate severe acute pancreatitis (MASP) and SAP [15]. SAP accounts for a small proportion of AP, but it is often combined with MODS, leading to severe illness and high fatality rate. A retrospective multiple center study found that MAP, MSAP and SAP accounted for 73.4%, 13.5% and 13.1%, but the case fatality rate was 0.3%, 3.1% and 14.3%, respectively [16]. A national multiple center investigation in China found that the overall case fatality rate of acute pancreatitis was up to 4.6%, with 73.9% of deaths occurring within two weeks after admission. In 1743 patients (28.0%) diagnosed with SAP, the in-hospital fatality rate was 15.6% [17]. Although mortality rates have gradually decreased as intensive care has improved, SAP still has a high mortality rate [18, 19]. Seeking more effective treatment plan and promoting the rapid recovery of organ injury can shorten the course of disease and hospital stay, but also can reduce the pain of patients and family economic burden.
SV is a highly specific HNEI that acts by inhibiting neutrophil elastase (NE) activity and has beneficial effects on a variety of conditions caused by acute inflammation. It is currently the only drug approved worldwide for the treatment of ALI/ARDS [20–22]. Recent studies have found that the powerful anti-inflammatory ability of SV may also have a better inhibitory effect on the inflammatory response in other organs[23–26].
Blood NE activity was significantly increased in SAP patients, especially those with respiratory failure [27]. Necropsy of patients with acute necrotizing pancreatitis complicated with multiple organ failure showed increased neutrophil infiltration and significantly increased NE expression in necrotic pancreatic tissue [28]. These results suggest that SV as a NE inhibitor may be a potentially effective drug for the treatment of SAP. However, there is a lack of study results on large samples.
We retrospectively analyzed 71 patients with SAP, 29 of whom received SV in addition to conventional treatment, and the remaining 42 patients received conventional symptomatic supportive treatment. Previous studies have found that IL-6, IL-10 and TNF-α are important biomarkers in the progression of SAP and correlated with disease severity [29–33]. Therefore, these indicators were included in our study to reflect the disease progression of SAP. The results showed that there were no statistically significant differences in heart rates, breath rates, oxygenation index, body temperature, IL-6, IL-8, TNF-α, WBC, PCT, the rate of CRRT and ventilator utilization the two groups after one week of treatment, which were all improved compared with admission. In addition, there was no difference in the mean length of hospital stays and mortality between the two groups. SV showed no significant advantage in the treatment of SAP and SIRS.
The ratio of AKI recovery in SV group was higher than that in control group after one week of treatment, which may be related to the improvement of AKI kidney inflammation by SV. Li et al. found that SV could reduce the iNOS overexpression in the kidney of sepsis rats, inhibit the activation of Akt signaling pathway, and reduce inflammation, thus reducing the AKI caused by sepsis [5]. SV also significantly reduced Scr and urine KIM-1 levels in extracorporeal shock wave lithotripsy (ESWL) treated rats, and inhibited renal tissue inflammation and interstitial damage [34]. These results suggested that SV may play a role in the recovery of kidney injury.
Previous studies have shown that SV could significantly reduce pathological abnormalities of lung and pancreas as well as biochemical abnormalities in rat models with taurochate-induced acute pancreatitis [7, 35]. Our results found that although there was no difference in the proportion of patients using ventilator between the two groups, the SV group had shorter ventilator use and reduced patient suffering.
In addition, we found that bowel sounds seemed to recover better in the SV group after one week treatment. SV might improve intestinal motility in SAP patients. This may attribute to that SV can improve the intestinal microbial and metabolic disorders caused by sepsis [36]. However, this phenomenon is influenced by subjective factors and there is no relevant study at present. The validity of the results needs more data to verify.
Limitation
Our study preliminarily observed the safety and efficacy of SV in SAP combined with SIRS. Due to the small sample size and retrospective analysis, our study had some limitations, which may affect the determination of results. In addition, there are few studies related to SV in AP treatment, and our study lacks sufficient theoretical basis, and a larger sample size randomized controlled study is needed to verify it.