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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.
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Pathology - Choledocholithiasis
Pathophysiology
Acute hepatic dysfunction is the result of gallstones becoming stuck in the CBD. The majority of the time, stones move from the gallbladder (cholesterol stones), but any illness that causes biliary stasis, such as hemolytic anemia (pigment stones), can also cause stones to form in the bile duct from scratch. This patient's laboratory tests show insufficient bilirubin excretion. The results show a significant increase in both alkaline phosphatase and direct bilirubin, which is indicative of biliary tract obstruction. Merely slight elevations in AST and ALT suggest a minimal level of hepatocellular involvement. Choledocholithiasis is more common in people over 40; risk factors include obesity, cholelithiasis, exposure to estrogen, and pancreatitis. An additional worry that can point to an infection is the patient's elevated neutrophil fraction. Fever, jaundice, and discomfort in the right upper quadrant are the hallmarks of chol-angitis, an infection of the bile ducts that can develop as a consequence of choledocholithiasis (Charcot's triangle).
Pathophysiology
Acute hepatic dysfunction is the result of gallstones becoming stuck in the CBD. The majority of the time, stones move from the gallbladder (cholesterol stones), but any illness that causes biliary stasis, such as hemolytic anemia (pigment stones), can also cause stones to form in the bile duct from scratch. This patient's laboratory tests show insufficient bilirubin excretion. The results show a significant increase in both alkaline phosphatase and direct bilirubin, which is indicative of biliary tract obstruction. Merely slight elevations in AST and ALT suggest a minimal level of hepatocellular involvement. Choledocholithiasis is more common in people over 40; risk factors include obesity, cholelithiasis, exposure to estrogen, and pancreatitis. An additional worry that can point to an infection is the patient's elevated neutrophil fraction. Fever, jaundice, and discomfort in the right upper quadrant are the hallmarks of chol-angitis, an infection of the bile ducts that can develop as a consequence of choledocholithiasis (Charcot's triangle).
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Pathology - Liver Cirrhosis and Ascites
In this long-term illness, which is frequently brought on by alcoholism or hepatitis C, damage to the liver cells results in inflammation, necrosis, and eventually cirrhotic fibrosis and scarring.
The normal architecture and vascular components of the liver are destroyed by fibrosis, which gradually reduces liver function and blood supply. Low albumin production by the sick liver causes ascites, which is characterized by a drop in intravascular fluid osmotic pressure. Chronically low effective circulation volume causes the kidneys to retain fluid, which aggravates the development of edema. Other potential side effects include encephalopathy brought on by toxin accumulation (ammonia and other chemicals), coagulopathy linked to a decrease in vitamin K synthesis, and portal hypertension and consequent GI bleeding. Patients run the risk of developing hepatocellular carcinoma in the future. Ascitic fluid must be removed for patient comfort, appropriate thoracic expansion, and to lower the risk of peritonitis.
In this long-term illness, which is frequently brought on by alcoholism or hepatitis C, damage to the liver cells results in inflammation, necrosis, and eventually cirrhotic fibrosis and scarring.
The normal architecture and vascular components of the liver are destroyed by fibrosis, which gradually reduces liver function and blood supply. Low albumin production by the sick liver causes ascites, which is characterized by a drop in intravascular fluid osmotic pressure. Chronically low effective circulation volume causes the kidneys to retain fluid, which aggravates the development of edema. Other potential side effects include encephalopathy brought on by toxin accumulation (ammonia and other chemicals), coagulopathy linked to a decrease in vitamin K synthesis, and portal hypertension and consequent GI bleeding. Patients run the risk of developing hepatocellular carcinoma in the future. Ascitic fluid must be removed for patient comfort, appropriate thoracic expansion, and to lower the risk of peritonitis.
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Pathology - Acute Hepatitis
Pathophysiology
Acute bacterial or viral infections as well as drug or toxin intake are potential causes of this illness. The patient's elevated bilirubin level, which is the outcome of acute hepatocyte injury and malfunction, is consistent with the physical signs of icterus. Palpable excruciating tenderness against the liver capsule is the outcome of hepatic enlargement.
When splenomegaly is absent, portal congestion is also absent.
Laboratory investigations reveal aberrant hepatocyte function (higher AST/ALT) in the absence of biliary blockage (very slightly raised alkaline phosphatase). Normal levels of prothrombin and albumin show that the liver's synthetic processes are unhampered. An acute infection is further supported by an elevated leukocyte count.
Pathophysiology
Acute bacterial or viral infections as well as drug or toxin intake are potential causes of this illness. The patient's elevated bilirubin level, which is the outcome of acute hepatocyte injury and malfunction, is consistent with the physical signs of icterus. Palpable excruciating tenderness against the liver capsule is the outcome of hepatic enlargement.
When splenomegaly is absent, portal congestion is also absent.
Laboratory investigations reveal aberrant hepatocyte function (higher AST/ALT) in the absence of biliary blockage (very slightly raised alkaline phosphatase). Normal levels of prothrombin and albumin show that the liver's synthetic processes are unhampered. An acute infection is further supported by an elevated leukocyte count.
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Pathology - Hereditary Hemochromatosis
Pathophysiology
Patients with inherited hemochromatosis (HH) have iron excess symptoms. Red blood cells (RBCs) contain the majority of the body's iron, which is used in hemoglobin formation. A restricted quantity of iron linked to ferritin is stored in liver cells. Transferrin is a protein that is linked to serum iron.
As there are no systems in place to eliminate excess iron, maintaining iron homeostasis in the duodenum necessitates controlling dietary absorption. When the liver's iron reserves are depleted, it releases the hormone hepcidin, which tells the duodenum to stop absorbing iron. It is believed that the HFE gene, which is a component of the hepatic ironsensing mechanism, is mutated in almost 90% of instances of HH. The HFE mutation leads to an increase of dietary iron absorption and a decrease in hepcidin secretion. End-organ damage from iron deposition often starts in the liver but can also affect other organs. Pancreatic islet damage is a common cause of diabetes mellitus; joint involvement and skin coloring (commonly known as "bronzing") are possible side effects. In Caucasian populations, there is a 10% to 15% carrier frequency for HH, an autosomal recessive condition. Expression of phenotypic variability is great. The majority of people are diagnosed without symptoms after being found through test screening.
Testing for genetics validates the diagnosis.
Pathophysiology
Patients with inherited hemochromatosis (HH) have iron excess symptoms. Red blood cells (RBCs) contain the majority of the body's iron, which is used in hemoglobin formation. A restricted quantity of iron linked to ferritin is stored in liver cells. Transferrin is a protein that is linked to serum iron.
As there are no systems in place to eliminate excess iron, maintaining iron homeostasis in the duodenum necessitates controlling dietary absorption. When the liver's iron reserves are depleted, it releases the hormone hepcidin, which tells the duodenum to stop absorbing iron. It is believed that the HFE gene, which is a component of the hepatic ironsensing mechanism, is mutated in almost 90% of instances of HH. The HFE mutation leads to an increase of dietary iron absorption and a decrease in hepcidin secretion. End-organ damage from iron deposition often starts in the liver but can also affect other organs. Pancreatic islet damage is a common cause of diabetes mellitus; joint involvement and skin coloring (commonly known as "bronzing") are possible side effects. In Caucasian populations, there is a 10% to 15% carrier frequency for HH, an autosomal recessive condition. Expression of phenotypic variability is great. The majority of people are diagnosed without symptoms after being found through test screening.
Testing for genetics validates the diagnosis.
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Pathology - Esophageal Variceal Hemorrhage
Pathophysiology
The patient can exhibit blood in their vomit as a result of severe bleeding from esophageal varices. Patients with liver cirrhosis-related portal hypertension frequently have this consequence. An increase in both portal blood flow and intrahepatic vascular resistance occurs simultaneously, leading to portal hypertension. As portal venous pressure rises, the lower esophageal veins, which are the location of portal systemic anastomosis, widen.
Because there are circulating vasodilator chemicals in advanced liver disease, there is a decrease in systemic vascular resistance. Increases in portal blood flow, portal venous pressure, and esophageal venous pressure result from this hyperdynamic circulation. Because nonspecific betablockers reduce cardiac output and subsequently portal blood flow, they can occasionally be used as a preventative measure. This patient experienced considerable bleeding as well as varices rupturing. Plasma may be used during resuscitation to counteract coagulopathy brought on by liver illness. Somatostatin reduces bleeding immediately and is an efficient splanchnic vasoconstrictor.
Additionally, an esophagogastroduodenoscopy will be done to bandage or sclerose the bleeding varices.
Pathophysiology
The patient can exhibit blood in their vomit as a result of severe bleeding from esophageal varices. Patients with liver cirrhosis-related portal hypertension frequently have this consequence. An increase in both portal blood flow and intrahepatic vascular resistance occurs simultaneously, leading to portal hypertension. As portal venous pressure rises, the lower esophageal veins, which are the location of portal systemic anastomosis, widen.
Because there are circulating vasodilator chemicals in advanced liver disease, there is a decrease in systemic vascular resistance. Increases in portal blood flow, portal venous pressure, and esophageal venous pressure result from this hyperdynamic circulation. Because nonspecific betablockers reduce cardiac output and subsequently portal blood flow, they can occasionally be used as a preventative measure. This patient experienced considerable bleeding as well as varices rupturing. Plasma may be used during resuscitation to counteract coagulopathy brought on by liver illness. Somatostatin reduces bleeding immediately and is an efficient splanchnic vasoconstrictor.
Additionally, an esophagogastroduodenoscopy will be done to bandage or sclerose the bleeding varices.
