GI

The Pharmacology of Emetics and Antiemetics: A Comprehensive Neurobiological and Clinical Analysis

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The pharmacological management of the emetic reflex represents one of the most significant intersections between neurological signal processing and clinical therapeutics. Emesis, defined as the forceful expulsion of gastrointestinal contents through the oral cavity, is a highly coordinated physiological response governed by a complex hierarchy of brainstem nuclei and peripheral sensors.[1, 2] While evolutionarily designed … Read more

Pharmacotherapy of Peptic Ulcer

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peptic ulcer disease

Scope: Pathophysiology, Drug Classifications, Mechanisms of Action, Clinical Pharmacology, and Therapeutic Guidelines. I. Introduction and Pathophysiology Peptic ulcer disease (PUD) is a chronic, relapsing inflammatory disorder characterized by a breach in the mucosa of the stomach (gastric ulcer) or the proximal duodenum (duodenal ulcer) extending through the muscularis mucosae. The pathophysiology of PUD is best … Read more

Pharmacotherapy of Peptic Ulcer Disease (PUD)

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peptic ulcer disease (PUD)

Introduction Peptic ulcer disease (PUD) encompasses the formation of ulcers in the stomach (gastric ulcer) or duodenum (duodenal ulcer), primarily caused by gastric acid hypersecretion and/or compromised defense of the gastric and duodenal mucosa. While Helicobacter pylori (H. pylori) infection remains a principal etiology for many cases, other contributing factors include the use of nonsteroidal anti-inflammatory drugs (NSAIDs), stress-related mucosal injury, and Zollinger-Ellison syndrome (gastrinoma). Clinically, patients may present … Read more

Inflammatory Bowel Disease (IBD)

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inflammatory bowel disease

Introduction Inflammatory Bowel Disease (IBD) is a chronic, relapsing-remitting inflammatory disorder of the gastrointestinal tract that primarily includes Crohn’s disease (CD) and ulcerative colitis (UC). Both conditions can produce significant morbidity, including abdominal pain, diarrhea (often with blood), weight loss, and systemic manifestations such as anemia. Thought to arise via an intricate interplay of genetic … Read more

Irritable Bowel Syndrome (IBS)

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irritable bowel syndrome

Introduction Irritable Bowel Syndrome (IBS) is a chronic functional gastrointestinal disorder characterized by abdominal pain and altered bowel habits in the absence of any identifiable structural or biochemical abnormalities. IBS affects an estimated 5-15% of the global population, placing a considerable burden on healthcare systems and patients’ quality of life. Despite ongoing research, IBS remains … Read more

Gastroesophageal Reflux Disease (GERD)

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GERD

I. Introduction Gastroesophageal reflux disease (GERD) is a chronic disorder characterized by the reflux of gastric contents into the esophagus, which leads to troublesome symptoms, mucosal injury, and, in some cases, serious complications such as strictures or Barrett’s esophagus. GERD is one of the most prevalent GI disorders globally, affecting up to 20% of adults in … Read more

Peptic Ulcer Disease (PUD) – A brief note

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peptic ulcer disease - PUD

Introduction Peptic Ulcer Disease (PUD) is a gastrointestinal disorder characterized by sores or lesions in the lining of the stomach or duodenum. It is a significant health concern worldwide, affecting a broad demographic. Pathophysiology Peptic ulcers result from an imbalance between mucosal defensive factors (like mucus and bicarbonate secretion) and aggressive factors (such as gastric … Read more

Helicobacter pylori Infection and Treatment

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helicobacter_pylori

Introduction Helicobacter pylori (H. pylori) is a spiral-shaped, gram-negative bacterium that colonizes the human stomach and duodenum. First identified in the early 1980s, this organism quickly garnered attention due to its critical role in the pathogenesis of peptic ulcer disease, chronic gastritis, and certain types of gastric malignancies, notably gastric adenocarcinoma and mucosa-associated lymphoid tissue (MALT) … Read more

Zollinger-Ellison Syndrome (ZES)

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ZE syndrome

I. Definition, Historical Perspective & Epidemiology Zollinger–Ellison Syndrome (ZES) is a rare disorder characterized by gastrin-secreting tumors (“gastrinomas”) of the pancreas or duodenum. These tumors lead to excessive gastric acid secretion, resulting in recurrent, treatment-resistant peptic ulcers, severe gastroesophageal reflux, and diarrhea.​ II. Pathophysiology 1. Gastrinoma Biology 2. Mechanism—Gastrin Overproduction 3. Resultant Clinical Effects III. Clinical … Read more

The Vomiting Centre and the Chemoreceptor Trigger Zone (CTZ)

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CTZ role in nausea and vomiting

1 · Introduction Vomiting (emesis) is an evolutionarily conserved defence reflex that forcefully expels gastric—and at times intestinal—contents through the mouth. Although the motor act seems singular, it is orchestrated by a distributed brain-stem network that integrates sensory danger signals from the gut, the bloodstream, the vestibular system and higher cortical areas. Two functional loci dominate … Read more