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Pathology - GERD, or gastroesophageal reflux disease
Pathophysiology
Acid reflux disease (GERD) is a prevalent illness affecting adults that causes stomach acid to reflux into the esophagus. The degree of discomfort and the degree of damage to the esophagus mucosa vary greatly in severity. The lower esophageal sphincter's smooth muscle malfunction is the pathophysiologic mechanism of gastroesophageal reflux disease (GERD). The majority of the time, incorrect, momentary relaxations happen, but persistently low sphincter pressure (<15 mm Hg) is linked to severe GERD. Sphincter relaxation is made worse by some foods, including as chocolate, alcohol, caffeine, and peppermint. Large meals, acidic drinks, and lying down just after eating all contribute to the occurrence, which is also higher in smokers and people who are overweight.
PPIs are nearly usually effective in treating uncomplicated GERD, as this patient's did.
Constant acid reflux raises the risk of esophageal ulcers, strictures, and cancer in addition to causing esophagitis. Chronic GERD leads to Barrett's esophagus, which is characterized by a metaplastic alteration of the normal stratified squamous epithelial lining of the esophagus, the development of a columnar epithelium, and an elevated risk of future cancer.
Pathophysiology
Acid reflux disease (GERD) is a prevalent illness affecting adults that causes stomach acid to reflux into the esophagus. The degree of discomfort and the degree of damage to the esophagus mucosa vary greatly in severity. The lower esophageal sphincter's smooth muscle malfunction is the pathophysiologic mechanism of gastroesophageal reflux disease (GERD). The majority of the time, incorrect, momentary relaxations happen, but persistently low sphincter pressure (<15 mm Hg) is linked to severe GERD. Sphincter relaxation is made worse by some foods, including as chocolate, alcohol, caffeine, and peppermint. Large meals, acidic drinks, and lying down just after eating all contribute to the occurrence, which is also higher in smokers and people who are overweight.
PPIs are nearly usually effective in treating uncomplicated GERD, as this patient's did.
Constant acid reflux raises the risk of esophageal ulcers, strictures, and cancer in addition to causing esophagitis. Chronic GERD leads to Barrett's esophagus, which is characterized by a metaplastic alteration of the normal stratified squamous epithelial lining of the esophagus, the development of a columnar epithelium, and an elevated risk of future cancer.
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Pathology - Gastroparesis
Pathophysiology
Although it can also be idiopathic, diabetes and surgery are the most prevalent causes of gastroparesis. Normal stomach motility requires the sympathetic and parasympathetic (vagal) neural systems to work in concert with the enteric nervous system. Neuronal or GI smooth muscle loss of function is possible. Although the exact process relating to diabetes is unknown, it is consistent with other signs of advanced diabetic disease, such as nephropathy (see the patient's elevated serum creatinine level) and neuropathy (notice the patient's sensory loss). In this instance, nutritional anemia, brittle hair and skin, and fat loss are signs of malnutrition brought on by gastroparesis. There is dehydration, as evidenced by tachycardia and low blood pressure. Hypokalemia and metabolic alkalosis have been caused by prolonged vomiting. The use of a feeding tube or prokinetic medication may be part of the therapy. Based on the broad intestinal gas shown on the radiograph, this patient may also have weak intestinal motility.
Pathophysiology
Although it can also be idiopathic, diabetes and surgery are the most prevalent causes of gastroparesis. Normal stomach motility requires the sympathetic and parasympathetic (vagal) neural systems to work in concert with the enteric nervous system. Neuronal or GI smooth muscle loss of function is possible. Although the exact process relating to diabetes is unknown, it is consistent with other signs of advanced diabetic disease, such as nephropathy (see the patient's elevated serum creatinine level) and neuropathy (notice the patient's sensory loss). In this instance, nutritional anemia, brittle hair and skin, and fat loss are signs of malnutrition brought on by gastroparesis. There is dehydration, as evidenced by tachycardia and low blood pressure. Hypokalemia and metabolic alkalosis have been caused by prolonged vomiting. The use of a feeding tube or prokinetic medication may be part of the therapy. Based on the broad intestinal gas shown on the radiograph, this patient may also have weak intestinal motility.
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Pathology - Duodenal Ulcer
Pathophysiology
An imbalance between protective and aggressive elements might lead to mucosal abnormalities in the small intestine or stomach. The surface mucous barrier, surface cell bicarbonate secretion, and increased mucosal blood flow are significant protective benefits that are bolstered by local prostaglandin synthesis. The most frequent aggressive variables are NSAID use and H. pylori infection.
Another risk factor is smoking. Life-threatening GI bleeding, such as bleeding from a posterior ulceration into the gastroduodenal artery or peritonitis from a GI wall perforation, are examples of complications. This patient most likely has a duodenal ulcer, which, unlike gastric ulcers, is more common in younger people and is frequently eased by eating. Due to its ability to cause chronic mucosal inflammation, H. pylori infection is a major pathogenic factor in up to 90% of duodenal ulcers. Microcytic erythrocytes and blood in the stool are signs of chronic gastrointestinal bleeding in this patient, who also has iron-deficiency anemia. The goal of treatment is to get rid of aggravating factors (such H. pylori and stop taking NSAIDs) and utilize PPIs or H2 blockers to lessen acidity. The best way to diagnose and assess the severity of an ulcer, as well as to treat severe ulcers and perforations with sclerotherapy, is by endoscopy. Unlike stomach ulcers, which have a 5% to 10% chance of being malignant, duodenal ulcers never need to be biopsyed.
Pathophysiology
An imbalance between protective and aggressive elements might lead to mucosal abnormalities in the small intestine or stomach. The surface mucous barrier, surface cell bicarbonate secretion, and increased mucosal blood flow are significant protective benefits that are bolstered by local prostaglandin synthesis. The most frequent aggressive variables are NSAID use and H. pylori infection.
Another risk factor is smoking. Life-threatening GI bleeding, such as bleeding from a posterior ulceration into the gastroduodenal artery or peritonitis from a GI wall perforation, are examples of complications. This patient most likely has a duodenal ulcer, which, unlike gastric ulcers, is more common in younger people and is frequently eased by eating. Due to its ability to cause chronic mucosal inflammation, H. pylori infection is a major pathogenic factor in up to 90% of duodenal ulcers. Microcytic erythrocytes and blood in the stool are signs of chronic gastrointestinal bleeding in this patient, who also has iron-deficiency anemia. The goal of treatment is to get rid of aggravating factors (such H. pylori and stop taking NSAIDs) and utilize PPIs or H2 blockers to lessen acidity. The best way to diagnose and assess the severity of an ulcer, as well as to treat severe ulcers and perforations with sclerotherapy, is by endoscopy. Unlike stomach ulcers, which have a 5% to 10% chance of being malignant, duodenal ulcers never need to be biopsyed.
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Pathology - Zollinger-Ellison Syndrome
Pathophysiology
Acid secretion is stimulated and gastric parietal cells proliferate due to hypersecretion of the peptide hormone gastrin from a non-B-cell islet cell endocrine tumor. Gastrin mainly causes the enterochromaffin (ECL) cells of the stomach mucosa to release histamine, which in turn encourages the parietal cells to secrete acid. When the stomach pH falls below 3.0, it is generally released by enteroendocrine (G-) cells in the stomach antrum. Uncontrolled secretion of gastrin occurs when a gastrinoma other than the stomach is present, usually in the pancreas. In the small intestine, excessive acidity deactivates pancreatic enzymes and results in maldigestion, which in this instance leads to malnutrition, diarrhea, and steatorrhea. Tachycardia and low blood pressure are indicative of severe gastrointestinal bleeding. A tumor may be detected by MRI, although nuclear scintigraphy is frequently necessary.
If discrete tumors are discovered, surgical resection is the best course of action. Although ZES is an uncommon cause of peptic ulcer disease, half of cases have malignant metastases to the liver and lymph nodes. ZES sufferers that also have multiple endocrine neoplasia syndrome type 1 (MEN 1) account for thirty percent of cases.
Pathophysiology
Acid secretion is stimulated and gastric parietal cells proliferate due to hypersecretion of the peptide hormone gastrin from a non-B-cell islet cell endocrine tumor. Gastrin mainly causes the enterochromaffin (ECL) cells of the stomach mucosa to release histamine, which in turn encourages the parietal cells to secrete acid. When the stomach pH falls below 3.0, it is generally released by enteroendocrine (G-) cells in the stomach antrum. Uncontrolled secretion of gastrin occurs when a gastrinoma other than the stomach is present, usually in the pancreas. In the small intestine, excessive acidity deactivates pancreatic enzymes and results in maldigestion, which in this instance leads to malnutrition, diarrhea, and steatorrhea. Tachycardia and low blood pressure are indicative of severe gastrointestinal bleeding. A tumor may be detected by MRI, although nuclear scintigraphy is frequently necessary.
If discrete tumors are discovered, surgical resection is the best course of action. Although ZES is an uncommon cause of peptic ulcer disease, half of cases have malignant metastases to the liver and lymph nodes. ZES sufferers that also have multiple endocrine neoplasia syndrome type 1 (MEN 1) account for thirty percent of cases.
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Pathology - Small Bowel Obstruction (SBO)
Pathophysiology
In 75% of cases, the cause is either hernias or, in this instance, adhesions from prior abdominal surgery.
Because the obstruction opposes peristaltic waves, obstruction-related pain is frequently paroxysmal. Peristalstic waves have the potential to cause loud bowel sounds, or borerygmi, which will occur simultaneously with the pain. Edema of the intestinal wall and gas and fluid buildup in the gut close to the obstruction are the causes of distention of the abdomen. In an upright abdominal film, air-fluid levels can be detected proximal to the blockage as progressive black-white horizontal interfaces within the intestine; the absence of colonic gas is pathognomonic of SBO and suggests a total obstruction.
Following many hours of blockage, fluid moves into the intestinal lumen, resulting in hypovolemia, which is shown as tachycardia and low blood pressure.
Vomiting due to visceral discomfort occurs in hypovolemia and hypokalemia. In the intestine, high intraluminal pressure reduces blood flow, which results in ischemia and damage to the intestinal wall. In this instance, a fever and leukocytosis indicate a possible breach of the intestinal barrier and peritonitis.
Pathophysiology
In 75% of cases, the cause is either hernias or, in this instance, adhesions from prior abdominal surgery.
Because the obstruction opposes peristaltic waves, obstruction-related pain is frequently paroxysmal. Peristalstic waves have the potential to cause loud bowel sounds, or borerygmi, which will occur simultaneously with the pain. Edema of the intestinal wall and gas and fluid buildup in the gut close to the obstruction are the causes of distention of the abdomen. In an upright abdominal film, air-fluid levels can be detected proximal to the blockage as progressive black-white horizontal interfaces within the intestine; the absence of colonic gas is pathognomonic of SBO and suggests a total obstruction.
Following many hours of blockage, fluid moves into the intestinal lumen, resulting in hypovolemia, which is shown as tachycardia and low blood pressure.
Vomiting due to visceral discomfort occurs in hypovolemia and hypokalemia. In the intestine, high intraluminal pressure reduces blood flow, which results in ischemia and damage to the intestinal wall. In this instance, a fever and leukocytosis indicate a possible breach of the intestinal barrier and peritonitis.
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Pathology - Celiac Disease
Pathophysiology
Another name for it is celiac sprue. Autoantibodies to gluten are the source of an autoimmune disorder, which can manifest in early childhood or early adulthood. A protein called gluten can be found in grains like barley, rye, and oats. According to the patient's laboratory results, the disease's physical signs are caused by the flattening of villous processes in the small intestine, which destroys the natural architecture of villous cells and severely impairs the body's ability to absorb iron, lipids, and vitamin B12. Since the distal ileum is typically where vitamin B12 is absorbed and the duodenum is where iron is primarily absorbed, the presence of malabsorption of both chemicals suggests broad small bowel involvement. Dermatitis herpetiformis, which typically manifests on extensor surfaces, is closely linked to celiac disease.
Symptoms will improve if gluten-containing goods are avoided.
Pathophysiology
Another name for it is celiac sprue. Autoantibodies to gluten are the source of an autoimmune disorder, which can manifest in early childhood or early adulthood. A protein called gluten can be found in grains like barley, rye, and oats. According to the patient's laboratory results, the disease's physical signs are caused by the flattening of villous processes in the small intestine, which destroys the natural architecture of villous cells and severely impairs the body's ability to absorb iron, lipids, and vitamin B12. Since the distal ileum is typically where vitamin B12 is absorbed and the duodenum is where iron is primarily absorbed, the presence of malabsorption of both chemicals suggests broad small bowel involvement. Dermatitis herpetiformis, which typically manifests on extensor surfaces, is closely linked to celiac disease.
Symptoms will improve if gluten-containing goods are avoided.
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Pathology - Irritable Bowel Syndrome (IBS)
Pathophysiology
Among the top 10 reasons patients see a primary care physician is IBS, the most prevalent functional bowel illness.
Women make about 70% of the patient population, and most receive their diagnosis between the ages of 20 and 40. IBS frequently coexists with psychological issues such anxiety disorders, depression, or a history of sexual or physical abuse. Normal motility is disrupted during pathogenesis at the level of the GI tract's neuroendocrine regulation. Additionally, there is visceral hypersensitivity that is CNS and peripherally mediated. The condition must meet two requirements in order to be diagnosed: the recurrent stomach pain must be chronic (lasting longer than three months) and its beginning must be linked to changes in the frequency or type of feces. There are various types of IBS, characterized by alternating episodes of diarrhea or constipation. It is necessary to rule out other common illnesses that share similar symptoms, such as lactose intolerance, inflammatory bowel disease (IBD), celiac disease, and bacterial overgrowth in the small intestine. The limited treatment options for IBS include high-fiber diets, psychotherapy, antidepressant therapy, and medicines to relieve constipation or diarrhea.
Pathophysiology
Among the top 10 reasons patients see a primary care physician is IBS, the most prevalent functional bowel illness.
Women make about 70% of the patient population, and most receive their diagnosis between the ages of 20 and 40. IBS frequently coexists with psychological issues such anxiety disorders, depression, or a history of sexual or physical abuse. Normal motility is disrupted during pathogenesis at the level of the GI tract's neuroendocrine regulation. Additionally, there is visceral hypersensitivity that is CNS and peripherally mediated. The condition must meet two requirements in order to be diagnosed: the recurrent stomach pain must be chronic (lasting longer than three months) and its beginning must be linked to changes in the frequency or type of feces. There are various types of IBS, characterized by alternating episodes of diarrhea or constipation. It is necessary to rule out other common illnesses that share similar symptoms, such as lactose intolerance, inflammatory bowel disease (IBD), celiac disease, and bacterial overgrowth in the small intestine. The limited treatment options for IBS include high-fiber diets, psychotherapy, antidepressant therapy, and medicines to relieve constipation or diarrhea.
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Pathology-Chronic Mesenteric Ischemia (Ischemic Colitis)
Pathophysiology
When at least two of the three main arteries leading to the gastrointestinal tract—the celiac, superior, and inferior mesenteric arteries—have atherosclerotic constriction, it results in chronic mesenteric ischemia. The traditional trio of symptoms—weight loss, abdominal bruit, and postprandial pain (abdominal angina)—are all present in this case. To confirm the diagnosis, angiogram is required to look at significant vascular stenosis. The SNS's activity as a result of extreme pain is reflected in the vital signs. Due to fixed vascular stenosis, which reduces blood supply to the stomach and small intestinal mucosa, the pain is brought on by bowel ischemia. Normal postprandial enteric blood flow rises in response to the demands of digestion on metabolism. Vasodilation is typically mediated by local metabolites, VIP-ergic enteric neurons, and vagus nerve stimulation; however, significant vascular stenosis prevents this from working. Bowel infarction is unlikely in this instance since collateral circulations have gradually developed. On the other hand, acute mesenteric ischemia brought on by unexpected vascular blockage is a serious medical emergency with a high death rate.
Pathophysiology
When at least two of the three main arteries leading to the gastrointestinal tract—the celiac, superior, and inferior mesenteric arteries—have atherosclerotic constriction, it results in chronic mesenteric ischemia. The traditional trio of symptoms—weight loss, abdominal bruit, and postprandial pain (abdominal angina)—are all present in this case. To confirm the diagnosis, angiogram is required to look at significant vascular stenosis. The SNS's activity as a result of extreme pain is reflected in the vital signs. Due to fixed vascular stenosis, which reduces blood supply to the stomach and small intestinal mucosa, the pain is brought on by bowel ischemia. Normal postprandial enteric blood flow rises in response to the demands of digestion on metabolism. Vasodilation is typically mediated by local metabolites, VIP-ergic enteric neurons, and vagus nerve stimulation; however, significant vascular stenosis prevents this from working. Bowel infarction is unlikely in this instance since collateral circulations have gradually developed. On the other hand, acute mesenteric ischemia brought on by unexpected vascular blockage is a serious medical emergency with a high death rate.
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Pathology - Diverticular Disease
Pathophysiology
The diverticular muscle layer (teniae coli) of the colon makes it prone to diverticula development. Diverticula may form as a result of the colonic wall deteriorating with age and the high intraluminal pressures brought on by segmenting (mixing) contractions. These conditions can also generate mucosal and submucosal herniations through the muscularis propria. The most frequent location is the sigmoid colon, which is in line with where the patient's pain is located. One risk factor is a diet deficient in fiber. Leukocytosis and fever indicate diverticulitis, an inflammatory condition brought on by the deterioration of the diverticular wall and potential fecal blockage.
To reduce the danger of bowel perforation, a CT scan should be utilized instead of an endoscopy once the diagnosis has been confirmed. Blood in the stool denotes no diverticular hemorrhage, and the absence of generalized abdominal discomfort or hemodynamic instability suggests no intestinal perforation or peritonitis. The majority of patients respond well to conservative medical treatment, which includes antibiotics and colonic rest.
Pathophysiology
The diverticular muscle layer (teniae coli) of the colon makes it prone to diverticula development. Diverticula may form as a result of the colonic wall deteriorating with age and the high intraluminal pressures brought on by segmenting (mixing) contractions. These conditions can also generate mucosal and submucosal herniations through the muscularis propria. The most frequent location is the sigmoid colon, which is in line with where the patient's pain is located. One risk factor is a diet deficient in fiber. Leukocytosis and fever indicate diverticulitis, an inflammatory condition brought on by the deterioration of the diverticular wall and potential fecal blockage.
To reduce the danger of bowel perforation, a CT scan should be utilized instead of an endoscopy once the diagnosis has been confirmed. Blood in the stool denotes no diverticular hemorrhage, and the absence of generalized abdominal discomfort or hemodynamic instability suggests no intestinal perforation or peritonitis. The majority of patients respond well to conservative medical treatment, which includes antibiotics and colonic rest.
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Pathology - Crohn's disease
Pathophysiology
There are two main kinds of these chronic inflammatory disorders: ulcerative colitis (UC) and Crohn's disease (CD).
An aberrant immune response to the normal gut flora is the outcome of a complex interplay of genetic, microbial, and immunologic variables that leads to the pathogenesis of inflammatory bowel disease (IBD). Leukocytosis, elevated C-reactive protein, and fecal leukocytes are examples of inflammatory markers present in this patient along with a favorable family history and chronicity. Clinical characteristics and immunologic profiles of CD and UC are different: In contrast to CD, which is a transmural illness characterized by the development of stenosis, fistulas, and gut obstruction sometimes accompanied by widely dispersed afflicted areas, UC is confined to the mucosal layer, begins in the rectum, and advances proximally in a confluent rather than dispersed way. Together with CT imaging, the patient's clinical symptoms point to isolated ileocecal illness that is more consistent with CD than UC. Fecal fat is a sign of small bowel involvement-related malabsorption. Tympany and distention suggest a possible bowel blockage.
Pathophysiology
There are two main kinds of these chronic inflammatory disorders: ulcerative colitis (UC) and Crohn's disease (CD).
An aberrant immune response to the normal gut flora is the outcome of a complex interplay of genetic, microbial, and immunologic variables that leads to the pathogenesis of inflammatory bowel disease (IBD). Leukocytosis, elevated C-reactive protein, and fecal leukocytes are examples of inflammatory markers present in this patient along with a favorable family history and chronicity. Clinical characteristics and immunologic profiles of CD and UC are different: In contrast to CD, which is a transmural illness characterized by the development of stenosis, fistulas, and gut obstruction sometimes accompanied by widely dispersed afflicted areas, UC is confined to the mucosal layer, begins in the rectum, and advances proximally in a confluent rather than dispersed way. Together with CT imaging, the patient's clinical symptoms point to isolated ileocecal illness that is more consistent with CD than UC. Fecal fat is a sign of small bowel involvement-related malabsorption. Tympany and distention suggest a possible bowel blockage.
