A clinical guide to using intravenous proton-pump inhibitors in reflux and peptic ulcers

Proton Pump Inhibitor Therapy Increases the Risk of Spontaneous Bacterial Peritonitis in Patients with HBV-Related Acute-on-Chronic Liver Failure

INTRODUCTION

Spontaneous bacterial peritonitis (SBP) is a common infection in patients with hepatitis B virus (HBV)-related acute-on-chronic liver failure (ACLF). SBP significantly increases the mortality rate and medical costs. The association between proton pump inhibitor (PPI) use and SBP remains unclear. We conducted a retrospective study to investigate the association between PPI use and SBP in patients with HBV-related ACLF and to explore the risk factors for SBP.

METHODS

We compared the SBP incidence between the PPI and non-PPI groups before and after propensity score matching and explored the association between the duration and type of PPI and SBP occurrence. Risk factors for SBP occurrence were determined by univariate and multivariate logistic regression analysis.

RESULTS

The SBP incidence was higher in the PPI group than in the non-PPI group before and after propensity score matching. The SBP incidence increased for elevated MELD scores in PPI users. There was a similar SBP incidence in both different types and durations of PPI users. MELD score, old age, male sex, and high WBC count were significant independent risk factors for SBP in PPI users with HBV-related ACLF in the hospital.

CONCLUSIONS

PPI therapy increases the risk of SBP development in patients with HBV-related ACLF. MELD score, old age, male sex, and high WBC count could serve as predictors of SBP in PPI users. Caution should be taken regarding PPI use, especially for patients with MELD scores > 30.

Interplay of potassium channel, gastric parietal cell and proton pump in gastrointestinal physiology, pathology and pharmacology

Gastric acid secretion plays a pivotal role in the physiology of gastrointestinal tract. The functioning of the system encompasses a P2 ATPase pump (which shuttles electroneutral function at low pH) along with different voltage sensitive/neutral ion channels, cytosolic proteins, acid sensor receptors as well hormonal regulators. The increased acid secretion is a pathological marker of several diseases like peptic ulcer, gastroesophageal reflux disease (GERD), chronic gastritis, and the bug Helicobacter pylori (H. pylori) has also a critical role, which altogether affects the patient's quality of life. This review comprehensively describes about the nature of potassium ion channel and its mediators, the different clinical strategy to control acid rebound, and some basic experimental observations performed to study the interplay of ion channels, pumps, as well as mediators during acid secretion. Different aspects of regulation of gastric acid secretion have been focused either in terms of physiology of secretion or molecular interactions. The importance of H pylori infection and its treatment have also been discussed. Furthermore, the relevance of calcium signaling during acid secretion has been reviewed. The entire theme will make anyone to understand in details about the gastric secretion machinery in general.

The Pattern of Intravenous Proton-Pump Inhibitor Utilization at an Academic Medical Center in Riyadh, Saudi Arabia

Objective:

This study was designed to evaluate the extent of inappropriate utilization of intravenous proton-pump inhibitors (IV-PPIs) and its financial burden in a Middle Eastern tertiary care university hospital.

Methods:

This was an observational, retrospective, cross-sectional study carried out in King Saud University Medical City, Riyadh, Saudi Arabia. During a study period of 6 consecutive weeks, all hospitalized adult patients (age ≥18) who received IV-PPI selected and mapped with their indications. The patient indications analyzed in comparison with the appropriate indications developed based on the evidence from published literature and guidelines.

Findings:

A total of 347 patients were identified, with a mean age of 51.5 years, of which 51.9% were male. Of all the patients who received IV-PPIs, 251 (72.3%), 66 (19%), and 30 (8.7%) received for stress ulcer prophylaxis (SUP), peptic ulcer disease (PUD) or gastroesophageal reflux diseases (GERDs), and upper gastrointestinal bleeding, respectively. Overall, only 110 (31.7%) of the 347 patients received IV-PPIs appropriately. The patients with SUP showed the highest percentage of inappropriate use of IV-PPI (80.59%) compared to PUD/GERD (19%). The total cost of inappropriate prescription of IV-PPI was 585,167 Saudi Riyal (SAR) (156,044 USD).

Conclusion:

There is a high tendency of IV-PPI's inappropriate prescription in our hospital setting. This large-scale inappropriate prescription of IV-PPI in the hospital setting not only may lead to increased financial burden but also expose patients to number of undesired effects.

Gastroduodenal Ulceration in Small Animals: Part 2. Proton Pump Inhibitors and Histamine-2 Receptor Antagonists

In the first part of this review, we discussed the pathophysiology and epidemiology of gastric acid secretion and the epidemiology of gastroduodenal ulceration in dogs and cats. In this section, we discuss the pharmacology and evidence-based clinical use of histamine-2 receptor antagonists and proton pump inhibitors.

Audit of IV pantoprazole: pattern of administration and compliance with guideline in a teaching hospital

BACKGROUND

Drug use evaluation is a performance improvement method that evaluates medication-use processes. Medication studies are especially important for drugs with narrow therapeutic index, specific indication, high costs as well as for drugs with widespread use. Intravenous pantoprazole always ranked among the top 5 costly drugs in Amir-al-Momenin Hospital. Considering the fact that widespread and inappropriate use of this drug is considered as a concern in hospitals all over the world rather than being a regional problem, we decided to establish a guideline for intravenous (IV) pantoprazole in our hospital and evaluated the pattern of its administration both before and after establishing the guideline.

METHODS

This is an experimental study (clinical trial) performed at the Amir-al-Momenin Hospital, on 400 randomly selected patients receiving IV pantoprazole (bolus or infusion) during a 6-month period (3 months before and 3 months after establishing guideline). We used predesigned data collection forms to collect related information. We used SPSS Ver. 18 for statistical analysis.

RESULTS

Our results showed that the established guideline could significantly reduce the rate (P = 0.00) and cost (301,289,000 Rials or 8608 USD in 3 months study period after establishing guideline) of IV pantoprazole administration, but failed to rectify indications and dosage of its administration at the same rate. Stress ulcer prophylaxis was the most frequent approved indication for IV pantoprazole administration in our study population. We also observed that the rate of commitment to the guideline decreased by the time passed from its establishment.

CONCLUSION

We concluded that although establishing guideline was successful in reducing the overall rate of IV pantoprazole administration and its related costs, different contributing factors halted its effect on correcting the prescribed dosage and indications, especially as the time gaps from guideline establishment. This fact magnifies the importance of continuous educations of prescribers about the importance of evidence based practice and need for and implementing a powerful executive supervisory in our hospital.

Portal hypertensive gastropathy: A systematic review of the pathophysiology, clinical presentation, natural history and therapy

AIM

To describe the pathophysiology, clinical presentation, natural history, and therapy of portal hypertensive gastropathy (PHG) based on a systematic literature review.

METHODS

Computerized search of the literature was performed via PubMed using the following medical subject headings or keywords: "portal" and "gastropathy"; or "portal" and "hypertensive"; or "congestive" and "gastropathy"; or "congestive" and "gastroenteropathy". The following criteria were applied for study inclusion: Publication in peer-reviewed journals, and publication since 1980. Articles were independently evaluated by each author and selected for inclusion by consensus after discussion based on the following criteria: Well-designed, prospective trials; recent studies; large study populations; and study emphasis on PHG.

RESULTS

PHG is diagnosed by characteristic endoscopic findings of small polygonal areas of variable erythema surrounded by a pale, reticular border in a mosaic pattern in the gastric fundus/body in a patient with cirrhotic or non-cirrhotic portal hypertension. Histologic findings include capillary and venule dilatation, congestion, and tortuosity, without vascular fibrin thrombi or inflammatory cells in gastric submucosa. PHG is differentiated from gastric antral vascular ectasia by a different endoscopic appearance. The etiology of PHG is inadequately understood. Portal hypertension is necessary but insufficient to develop PHG because many patients have portal hypertension without PHG. PHG increases in frequency with more severe portal hypertension, advanced liver disease, longer liver disease duration, presence of esophageal varices, and endoscopic variceal obliteration. PHG pathogenesis is related to a hyperdynamic circulation, induced by portal hypertension, characterized by increased intrahepatic resistance to flow, increased splanchnic flow, increased total gastric flow, and most likely decreased gastric mucosal flow. Gastric mucosa in PHG shows increased susceptibility to gastrotoxic chemicals and poor wound healing. Nitrous oxide, free radicals, tumor necrosis factor-alpha, and glucagon may contribute to PHG development. Acute and chronic gastrointestinal bleeding are the only clinical complications. Bleeding is typically mild-to-moderate. Endoscopic therapy is rarely useful because the bleeding is typically diffuse. Acute bleeding is primarily treated with octreotide, often with concomitant proton pump inhibitor therapy, or secondarily treated with vasopressin or terlipressin. Nonselective β-adrenergic receptor antagonists, particularly propranolol, are used to prevent bleeding after an acute episode or for chronic bleeding. Iron deficiency anemia from chronic bleeding may require iron replacement therapy. Transjugular-intrahepatic-portosystemic-shunt and liver transplantation are highly successful ultimate therapies because they reduce the underlying portal hypertension.

CONCLUSION

PHG is important to recognize in patients with cirrhotic or non-cirrhotic portal hypertension because it can cause acute or chronic GI bleeding that often requires pharmacologic therapy.

Pharmacotherapy of Zollinger-Ellison syndrome

INTRODUCTION

The role of pharmacotherapy in the management of patients with Zollinger-Ellison syndrome (ZES) is often equated with the medical management of acid hypersecretion. However, pharmacotherapy is also increasingly involved in the other management areas of these patients.

AREAS COVERED

This paper reviews the role of pharmacotherapy in all aspects of the management of patients with ZES. Newer aspects are emphasized. This includes the difficulty of diagnosing ZES in patients taking proton pump inhibitors. Also covered is the role of pharmacotherapy in controlling acid hypersecretion and other hormonal hypersecretory states these patients may develop, including hyperparathyroidism in patients with multiple endocrine neoplasia type 1 and ZES; tumor localization; and the treatment of advanced metastatic disease. The last includes chemotherapy, liver-directed therapies, biotherapy (somatostatin/interferon), peptide radio-receptor therapy and molecular-targeted therapies including the use of mTor inhibitors (everolimus) and tyrosine kinase inhibitors (sunitinib).

EXPERT OPINION

Pharmacotherapy is now involved in all aspects of the management of patients with ZES, with the result that ZES has progressed from being considered an entirely surgical disease initially to the present where medical treatment plays a major role in almost all aspects of the management of these patients.