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Questions and Answers
Match the following causes of vagal indigestion with their descriptions:
Match the following causes of vagal indigestion with their descriptions:
Extension from oral & esophageal infections = Infection spread leading to reticulum penetration Grain overload = Increased carbohydrate leading to ruminal lactic acidosis Sudden change to high CHO diet = Rapid dietary transition causing bacterial overgrowth Overgrowth of gram + bacteria = Excessive bacteria altering ruminal pH
Match the sequelae of grain overload with their outcomes:
Match the sequelae of grain overload with their outcomes:
Bacterial rumenitis = Inflammation caused by Fusobacterium necrophorum Liver abscesses = Potential rupture into vena cava resulting in embolism Mycotic rumenitis = Infarcts leading to systemic issues Ulcers on the rumen pillars = Damage resulting from grain overload complications
Match the conditions with their associated symptoms:
Match the conditions with their associated symptoms:
Acute gastric dilation = Functional obstruction of cardia and pylorus Volvulus = Rotation on its mesenteric axis causing gas accumulation Abomasal displacement = Common GI disorder requiring surgical intervention Right abomasal displacement = Occurs in cows and calves, less common than left
Match the types of abomasal displacement with their characteristics:
Match the types of abomasal displacement with their characteristics:
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Match the following gastric conditions with their primary causes:
Match the following gastric conditions with their primary causes:
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Match the following symptoms with the related gastric condition:
Match the following symptoms with the related gastric condition:
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Match the causes of gastric ulcers with their descriptions:
Match the causes of gastric ulcers with their descriptions:
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Match the following gastric conditions with their descriptions:
Match the following gastric conditions with their descriptions:
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Match the following species with their gastric conditions:
Match the following species with their gastric conditions:
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Match the part of the forestomach with its description:
Match the part of the forestomach with its description:
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Match the type of bloat with its characteristics:
Match the type of bloat with its characteristics:
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Match the cause of bloat with its description:
Match the cause of bloat with its description:
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Match the condition related to foreign bodies with its consequence:
Match the condition related to foreign bodies with its consequence:
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Match the symptom of bloat with its description:
Match the symptom of bloat with its description:
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Match the digestive movement with its function:
Match the digestive movement with its function:
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Match the type of ruminal content with its characteristic:
Match the type of ruminal content with its characteristic:
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Match the condition related to bloat with its type:
Match the condition related to bloat with its type:
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Match the intestinal conditions with their definitions:
Match the intestinal conditions with their definitions:
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Match the types of enteritis with their specific areas affected:
Match the types of enteritis with their specific areas affected:
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Match the types of diarrhea with their descriptions:
Match the types of diarrhea with their descriptions:
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Match the sequealae with their effects:
Match the sequealae with their effects:
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Match the types of hernias with their descriptions:
Match the types of hernias with their descriptions:
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Match the types of intestinal inflammation with their causes:
Match the types of intestinal inflammation with their causes:
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Match the pathogenesis of diarrhea with their descriptions:
Match the pathogenesis of diarrhea with their descriptions:
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Match the inflammation types with the corresponding locations:
Match the inflammation types with the corresponding locations:
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Study Notes
Forestomachs
- The rumen, reticulum, and omasum make up the forestomachs
- They are lined by stratified squamous epithelium
- Examination of plant contents in the rumen can reveal toxicities
Ruminal Tympany (Bloat)
- Over-distension of the rumen and reticulum with fermentation gases
-
Primary Bloat (Frothy Bloat):
- Gases trapped in bubbles within the rumen
- Caused by:
- Plants with high soluble proteins (e.g., white clover, alfalfa, red clover) which trap bubbles
- High grain diets which decrease salivation (saliva has anti-foam properties)
-
Secondary Bloat (Free Gas Bloat):
- Blockage in the eructation mechanism
- Obstruction in the esophagus
- Vagal indigestion: ruminal motility inhibited due to vagal nerve damage
-
Why do animals with bloat die?
- Pressure from expanding rumen compresses the thorax
- Compression of the vena cava leads to poor venous return and cardiac arrest.
-
Gross findings:
- Abdominal distension
- Marked congestion of head and neck
- "Bloat line" on the esophagus at the thoracic inlet
Ruminal Contents & Foreign Bodies
- Layers of different substances develop within the rumen and are mixed by muscular movements
- Slurry contains bits of straw/hay mixed with liquid
- Solid/lighter bits are regurgitated for remastication
-
Foreign bodies:
- Trichobezoar (hair balls)
- Phytobezoars (plant balls)
- Lead substances (poisoning)
- Sharp metals
Fate of Sharp Metals
- Sharp metallic objects deposited directly into the reticulum
-
Consequences:
- Localized reticulitis
- Penetrated reticulum, diaphragm, and pericardial sac (Traumatic Reticulopericarditis)
- Penetrated reticulum damaging the vagus nerve (Vagal indigestion)
Inflammation of the Forestomach
-
Causes:
- Extension from oral and esophageal infections
- Grain overload (ruminal lactic acidosis)
-
Pathogenesis:
- Sudden change to high carbohydrate diet leads to overgrowth of gram-positive bacteria
- Increased lactic and dissociated fatty acids lower pH
- Ruminal atony and damage to mucosa
- Fluid moves from blood into the rumen
-
Outcome:
- Acute dehydration, acidosis, and endotoxemia
- Sudden death
Sequelae of Ruminal Inflammation
-
Bacterial rumenitis:
- Fusobacterium necrophorum
- Healed ulcers ("stellate scars")
-
Liver abscesses:
- Can rupture into vena cava leading to fatal septic embolism
-
Mycotic rumenitis:
- Well-demarcated, circular hemorrhagic infarcts
- Can become systemic, causing placentitis and abortion
Acute Gastric Dilation and Volvulus (GDV)
- Occurs predominantly in large dog breeds
-
Causes:
- Large meal (dry or highly fermentable)
- Failure of eructation and pyloric outflow
-
Pathogenesis:
- Gas accumulation leads to functional obstruction of cardia and pylorus
- Dilation occurs, followed by rotation on its mesenteric axis (volvulus)
-
Consequences:
- Compression of the diaphragm and vena cava leading to decreased venous return and cardiac output
Abomasal Displacement
-
Left abomasal displacement:
- Mostly in dairy cows, especially older, high producers
- Common postcalving period
- Usually requires surgery
-
Right abomasal displacement:
- Less frequent, but occurs in cows and calves
- Usually on the right side
Gastric/Abomasal Impaction
-
Causes:
- Low-quality roughage
- Low water intake
- Poor mastication
- Vagal nerve damage ("vagus indigestion")
- Pyloric stenosis
Gastric Dilation and Rupture
- Occurs in horses
-
Causes:
- Fermentable carbohydrates
- Secondary to intestinal obstruction
- Equine dysautonomia
-
Distinction:
- Ant-mortem rupture from post-mortem rupture
Gastric Ulcers
- Important but less common than in humans
-
Mechanism:
- Imbalance between acid secretion and mucosal protection
- Epithelial necrosis leads to erosion, ulceration, bleeding, and perforation
Causes of Gastric Ulcers
- Local mucosal injury
- High gastric acidity
- Local ischemia (stress ulcers)
- Steroids and NSAIDs (aspirin)
- Helicobacter (bacterial infection)
Signs of Gastric Ulcers
- Hematemesis (vomiting blood)
- Melena (dark, tarry stool)
- Anemia
- Abdominal pain
Gastritis
- Inflammation of the stomach
-
Ruminants:
- Clostridium septicum (Braxy or bradsot)
- Clostridium perfringens type A (Abomasitis with ulceration)
- Mycotic infections
-
Dogs and Cats:
- Uremia
- Chronic gastritis and Hypertrophy
- Helicobacter
Parasitic Diseases
-
Ruminants:
- Haemonchosis
- Ostertagiosis (lymphoid hyperplasia)
- Trichostrongylosis
-
Equine:
- Gastric bots
- Trichostrongylosis
- Draschia megastoma
- Habronema
Congenital Anomalies
-
Atresia:
- Absence of a normal opening
- Atresia ani: Absence of an anus
Intestinal Displacements and Malposition
-
Hernia: Protrusion of an organ through a natural or artificial opening
-
Internal:
- Diaphragmatic hernia (through diaphragm)
-
External:
- Ventral hernia
- Umbilical
- Scrotal
-
Internal:
-
Sequelae of hernias:
- Strangulation: Interference with blood flow
- Adynamic ileus: Lack of bowel movement
- Perforation
Torsion and Volvulus
- Torsion: Rotation of the organ around its long axis
- Volvulus: Twisting of the organ on its mesenteric axis
Intussusception
- Telescoping of one segment of bowel into another adjacent section
Enteritis
- Inflammation of the intestines
-
Types:
- Enteritis: Small intestine
- Typhlitis: Cecum
- Colitis: Large intestine
- Enterocolitis: All intestines
- Gastroenteritis: Stomach and small intestines
- Proctitis: Rectum
Diarrhea and Dysentery
- Diarrhea: Increase in stool mass, frequency, and/or fluidity
- Dysentery: Painful, bloody diarrhea
Pathogenesis of Diarrhea
- Malabsorption: Defective digestion/absorption
- Osmotic diarrhea: Exerted by luminal solutes
- Hypersecretion: Excessive intestinal fluid secretion induced by enterotoxins
- Exudation: Increased capillary or epithelial permeability
Types of Enteritis Based on Gross Appearance
- Catarrhal: Viral diseases
- Hemorrhagic: Bacterial diseases
- Fibrinous/fibrinonecrotic: Mycotic diseases
- Ulcerative: Protozoal diseases
- Proliferative/hyperplastic: Parasitic diseases
- Granulomatous: Noninfectious disease entities
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Description
Explore the anatomy of the forestomachs in ruminants, focusing on the rumen, reticulum, and omasum. Understand the causes and effects of ruminal tympany (bloat), including the differences between primary and secondary bloat. This quiz covers essential veterinary concepts related to ruminant physiology.