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144 Cards in this Set
- Front
- Back
What are the 3 parasites that most commonly cause liver disease in large animals?
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1) *Fasciola hepatica
2) Fascioliodes magna 3) Dicrocoelium dendritium -usually normal flora in the liver and don't cause pathology, but if have them probably have hepatica too |
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Why is the liver so important in ruminants?
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***ruminants do not absorb glucose, need liver to make glucose
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Why do we worry about liver flukes in large animals?
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Flukes migrate and create an anaerobic environment---> clostridial infections
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Where is Fasciola hepatica distributed?
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South central US and Florida, Pacific NW
-depends on distribution of intermediate host |
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What is the intermediate host of fasciola hepatica?
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Snails
-where fasciola hepatica does a lot of asexual reproduction |
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What type of weather do snails, the intermediate host of fasciola hepatica, live in?
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-Small temporary water habitats
-Prefer habitats wet for > 6 months / year |
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True or false. Fasciola can be introduced to a new area in livestock and infect local species of snails.
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True, and infected snails can introduce fasciola to new areas
-so if snails brought in on truck can infect pasture |
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Why is the transmission of F. hepatica different in the wet northwest and the wet southeast?
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Because important part of life cycle of snail is that it depends on the number of days above 50 degrees
-need like 14 or 21 days above 50 degrees, 24 hours a day |
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How is the seasonality of F. hepatica different in tropical regions?
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They're always present, bc it's above 50 degrees year round and wet
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**How long does it take for F. hepatic to reach the liver after the metacercarie are ingested on the vegetation?
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Takes 6-7 weeks to see liver flukes
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How long does it take F. hepatica to reach sexual maturity once inside the liver?
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2-4 weeks*****
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How long does it take after ingestion of metacercariae on vegetation before you can diagnose F. hepatica?
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6-7 weeks + 2-4 weeks= 8-11 weeks before can diagnose
-unless do a liver biopsy then can diagnose after 6-7 weeks |
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What are the 3 ways clinical disease of F. hepatica can present?
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1) Subclinical disease and production loss
2) Anemia, ill thrift and hepatic dysfunction due to fluke migration and feeding 3) Acute illness and sudden death from Cl. novyi and Cl. haemolyticum |
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Why can F. hepatic result in production loss?
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Because the liver is there to make glucose, so results in production loss
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How can you tell an animal is ill-thrift? (i.e. what are some clinical signs of an ill-thrift animal?)
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Skinny, poor haircoat
-in beef cattle see the rate of daily gain decrease -Dairy cows have decreased milk production -might se abortion or issues w/ reproduction if not enough glucose |
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How do animals present with black disease? Red water?
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Black disease: Dead- black on ventrum from bruising and hemolysis from hemorrhage
Red water: dead w/ hematuria |
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What kills an animal with a clostridium infection? Is it the bacteremic shower or acute toxemia?
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it's the acute toxemia that kills the animal, not the bacteria
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Can you diagnose C. haemolyticum (Bacillary hemoglobinuria) with a urinalysis?
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NO, toxin is present in urine, not the organism
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F. hepatica commonly causes subclinical infection, what are the only clinical signs?
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Reduced weight and feed efficiency
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In cattle, economic loss occurs with > or equal to ______ flukes/ animal.
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40
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Clinical disease occurs in cattle with > or equal to ______ flukes/ animal.
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200
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What are the clinical signs of subclinical disease due to F. hepatica? (3)
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Poor condition, reduced lactation and slower return to estrus in breeding cattle
-can look at how much food they're given : how much they're growing |
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What are 6 differential diagnosis for cattle with poor condition, reduced lactation and slower return to estrus in breeding cattle, especially in the SE USA?
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1) F. hepatica
2) BVDV 3) IBR (Bovine herpesvirus-1) 4) Leptospirosis* 5) Neospora* 6) Fescue toxicity** -estrogen like toxin |
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What cattle will first show clinical signs of F. hepatica?
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Those with the heaviest burden
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What are the clinical signs of F. hepatica (like those cattle w/ heaviest burdens)?
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-Weight loss, emaciation, depression, anorexia, rough coat
-anemia, hypoproteinemia, 'bottle jaw' -rarely mild icterus |
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Why do you get hypoproteinemia w/ liver flukes?
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Because damaging the liver= major production organ of proteins in the body
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What are 5 differential diagnoses for a young cow with low protein and submandibular edema?
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1) Ostertagia ostertagia
2) BVD* -protein losing enteropathy 3) Salmonella -diarrhea 4) Coronavirus -winter dysentery 5) Iatrogenic: too much fluids *not Johne's= cows 2-3 years old *E. coli= calves < 5 days old |
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Why do we rarely see bilirubinuria or therefore icterus in cattle?
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Rumen microbes use up all the bilirubin
-don't even usually see icterus w/ high bilirubin |
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Are sheep and goats more or less susceptible than cattle to F. hepatica?
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More susceptible
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Why can flukes be fatal in sheep & goats?
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Fluke entry to bile ducts can be fatal
-ascites, hemoabdomen, pallor and icterus if heavy burden of 1000-5000 |
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What type of disease is more common in small ruminants with F. hepatica? What are the clinical signs?
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Chronic disease
-burdens > 200 flukes -edema, ascites, emaciation (can get right sided heart failure) -extensive fibrosis occurs as liver heals |
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Why do small ruminants get higher fluke burdens of F. hepatica than cattle?
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Don't develop immunity like cattle do
-also why they tend to get chronic disease |
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What are 4 ways that disease results from F. hepatic results from maturation of the flukes in bile ducts?
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1) Hyperplastic cholangitis
2) Plasma protein loss 3) Blood loss 4) Flukes produce proline which creates depression anemia and biliary hyperplasia |
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How long does it take cattle to mount an immune response to F. hepatica infection?
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5-6 months post infection
-****few flukes survive > 12 months -after 12 months worry about secondary healing of liver |
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What are 3 reasons that fluke maturation in bile ducts results in blood loss?
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1) Lack of clotting factors
2) Blood cells get sheared in liver 3) Hemolysis **blood loss from hemolysis and hemorrhage |
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What are 4 components of diagnosing F. hepatica?
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1) History and geographic area
2) Clinical signs 3) CBC and chemistry 4) Fecal sediment examination for ova *not fecal float |
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What do you see on CBC and chemistry of an animal with F. hepatica infections?
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-anemia, hypoproteinemia
-mild eosinophilia -elevated heaptic enzymes: **GGT (parasites crawling through bile ducts), next look at SDH Secondary: AST, ALP |
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True or false. Fecal floats diagnosis trematodes not nematodes.
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False, Does not find trematodes, but does find nematodes
-hence fecal floats do not work to diagnose F. hepatica |
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When performing a fecal sedimentation F. hepatica must be distinguished from What? Why?
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Paramphistomum is smaller, rounded and nonpathogenic rumen fluke
-these 2 are often transmitted together bc same climate and intermediate host, so presence of paramphistomum may indicate presence of F. hepatica |
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Why do you have to treat animals with F. hepatica at least twice?
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Because flukecides do not kill the larvae, so must kill the adults, then wait and retreat
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What are the 2 antiparasitics used to kill F. hepatica flukes?
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Albendazole and clorsulon
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What is the optimal timing for using albendazole or clorsulon to treat F. hepatica flukes?
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Time treatment to ensure susceptibility (flukes >12 weeks after transmission season) but remove while < 6 m old and less pathogenic
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***What is the only flukecide for F. hepatica that can be used in lactating animal?
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Albndazole****
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What determines if cattle need twice a year treatment for F. hepatica?
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Burden load and hence the year (climate)
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How can you prevent F. hepatica?
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Single treatment in fall or early winter after transmission season kills adults before winter stress
-prevents egg shedding and snail infection next season 2) Fence off or drain snail habitat 3) pasture rotation 4) Molluscides (toxic to fish & wildlife) 5) public fluke monitoring -talk to neighbors |
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What an you do differently to prevent F. hepatica on high risk properties or in high risk years?
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-spring treatment on high risk properties or in high risk years to remove flukes acquired during late extended transmission on irrigated pastures or wet coastal regions
-check 10 random animals |
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How do the tunnels of coagulative necrosis from F. hepatica appear on necropsy?
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-Diffuse hepatic fibrosis, particularly ventral lobe
-can cause liver condemnation |
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What are 3 findings on necropsy that are due to mechanical damage and feeding and growth of F. hepatica flukes in the biliary tract?
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1) Proliferative cholangiohepatitis
2) Fibrosis and thickening of ducts w/ eventual calcification (in cattle) 3) Dark bile- excreted fluke products |
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What is the common name of Fascioloides magna?
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Large american liver fluke
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What animals are affected by F. magna?
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Sheep and cattle grazing common areas w/ natural hosts
-deer, elk and moose |
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F. magna and F. hepatica have similar life cycles, but how is F. magna different?
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Greater number of and variety of snail hosts
-broader geographic distribution since hosts tolerate a wider range of habitat and temperature |
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What type of host are cattle for F. magna?
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Dead end hosts
-rapidly encapsulate parasite |
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True or false. F. magna can be diagnosed in cattle via fecal sedimentation.
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False, cannot be diagnosed bc of a lack of fecal egg production
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What is the main significance of F. magna infection in cattle?
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Condemnation of liver and other organs
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Is F. magna a bigger issue in small ruminants or cattle?
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SHEEP AND GOATS
-parasite has unlimited migration -1-2 flukes can kill or cause severe hepatic insufficiency |
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What is the treatment for F. magna in sheep and goats?
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Albendazole
-avoid early in pregnancy |
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What is the common name for Dicrocoelium dendriticum?
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Lancet fluke
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Compare the disease of dicrocoelium dendriticum to that of fasciola flukes.
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Chroinc, less severe disease
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What is the relative size of dicrocoelium dendriticum?
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Small fluke (<1 cm)
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What is the intermediate host of Dicrocoelium dendriticum?
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Indirect life cycle w/ snail and ant hosts
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What type of host are goats, sheep and cattle for dicrocoelium dendriticum?
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Definitive hosts
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Where do adult Dicrocoelium dendriticum reside in the body?
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In bile ducts and shed eggs
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What is the life cycle of dicrocoelium dendriticum? (5)
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-eggs ingested by snails--> cercariae
-cercariae expelled & ingested by ants -infectious metacercariae develop in ants and cause paralysis -ants ingested by grazing livestock -Young flukes excyst in SI and enter the common bile duct to migrate to the liver |
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What is the prepatent period of Dicrocoelium dendriticum?
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8-12 weeks
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Dicrocoelium dendriticum are common in ______.
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North america
-prevalence as high as 45% in endemic areas |
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Dicrocoelium dendriticum are less pathogenic, but can be present in high numbers. So what kind of damage do they cause?
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Progressive inflammation of the biliary tree, cirrhosis and hepatic insufficiency
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What are the clinical signs of Dicrocoelium dendriticum? (5)
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Weight loss
Depression Anemia Hypoproteinemia Submandibular edema |
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How do you diagnose Dicrocoelium dendriticum?
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*Fecal sedimentation
-eggs are smaller, dark brown, operculated |
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What are the 4 differential diagnoses for Dicrocoelium dendriticum?
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1) Nematodes
2) Trematodes -F. hepatica -F. magna 3) Bacterial 4) Viral |
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When and what do we use to treat Dicrocoelium dendriticum?
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Albendazole, base treatment on using it on animals with highest worm burdens
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What are the 4 scenarios where large animals tend to get hepatic lipidosis?
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1)Fat cow syndrome of dairy cattle
2) protein energy malnutrition of beef cattle 3) pregnancy ketosis or 'twin lamb disease' of ewes and does 4) hyperlipidemia/ hyperlipemia of equids |
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What is the normal consequence of a negative energy balance in a large animal?
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-minor drop in blood glucose and drop in the insulin: glucagon ratio
-hormone sensitive lipases convert fat to FFA's and glycerol -mobilization of FFA to liver results in triglyceride storage in cells w/ eventual export as VLDL's |
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What goes wrong with normal pathophysiology that results in hepatic lipidosis?
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Lipidosis occurs when hepatic triglyceride formation exceeds FA oxidation and release of VLDLs
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Why do ruminants tend to get hepatic lipidosis?
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Have poor ability to export VLDL's possibly due to inadequate production of apolipoprotein A
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What are 7 options for treating hepatic lipidosis?
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1) Eliminate negative energy balance and the factors creating it
2) IV glucose infusion (most common) 3) Insulin 4) Niacin (B3) 5) Corticosteroids 6) Vitamin E/ Se 7) Transfaunation |
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Why do we give IV glucose infusion to patients with hepatic lipidosis?
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-Give some nutritional support
-Can increase Insulin: glucose ratio to decrease hormone sensitive lipase mobilization of FFA's and may stimulation production of VLDL's= trying to stop fat mobilization |
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Why do we give insulin to patients with hepatic lipidosis?
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To alter the insulin: glucagon ratio directly
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Why can niacin (B3) be given to patients with hepatic lipidosis?
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May reduce tissue lipolysis and fat load presented to liver
-better preventative |
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Why do you give an animal with hepatic lipidosis corticosteroids?
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Increase appetite
Reduce milk production Induce gluconeogenesis |
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Why do we give vitamin E and selenium to animals with hepatic lipidosis?
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Free radical scavengers
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What's the purpose of transfaunation in an animal with hepatic lipidosis?
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Enhance forestomach digestion and absorption of VFA's for energy and glucose precursors
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What is fat cow syndrome?
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Multifactorial condition characterized by mobilization of fat to the liver of post parturient dairy cows
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Why do cows with Fat Cow Syndrome get fat in the first place?
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They have too long of a lactation, when get long into lactation they are still on lactating cow diets= too many calories in and not enough calories out bc not producing enough milk
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Why do cats with Fat Cow Syndrome mobilize fats?
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Because when long in lactation or long dry off and eating lots of food and not making much milk and then go into next lactation (freshen or calf= high stress time) so start milking and metabolic demand goes way up before appetite does = ketosis
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Why is it a problem when cows with Fat Cow Syndrome mobilizes fats?
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If overconditioned cow and start mobilizing fats then lipoproteins go into liver to be repackaged and used because not taking in enough food
-cows are really poor at making lipoproteins in liver so all the mobilization of fat gets stuck in the liver ***Doesn't happen in horses or cats |
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Fat Cow Syndrome is complicated by concurrent ________ disease that result in reduced feed intake and further increase energy demand.
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Peri-parturient diseases
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What is type I ketosis? What's the treatment?
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Primary (lots of milk not enough appetite), happens b/w 7-10 days after freshening
-just give glucose |
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What is type II ketosis?
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Ketosis due to some other reason- like liver not working because full of fat, low calcium, retained placenta (can cause displacement of abomasum then not eating at all and get mobilization of fat)
-happens 3-5 days after calving |
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You are examining 3 cows, with BAS scores of: 1.5, 3, and 4.5. If one of them has a peri-parturient disease, which one would you suspect has it?
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The 1.5, can see all the transverse processes
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What is the number range for BAS scoring of beef cattle?
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1-9 scale
Dairy cows= 1-5 |
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What are 5 components that will help diagnose Fat Cow Syndrome?
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1) Physical exam
2) Liver enzymes frequently normal 3) Possible hypoglycemia -but usually have stress response 4) *Ketonuria 5) Refractory to treatment 6) Liver biopsy -problematic |
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Why is a liver biopsy problematic when trying to diagnose Fat Cow Syndrome?
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-Lipidosis (15-30%) present in normal cows
-Liver fat values > 34% correlate to clinical signs -don't usually biopsy |
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What are the 3 ketones present in the urine?
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Acetate
Beta-hydroxybutyrate Acetoacetate (what's measured with strips) |
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What is the prognosis of Fat Cow Syndrome?
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Guarded- mortality 25%
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What is the treatment for Fat Cow Syndrome?
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Identify and treat any predisposing disease
-address negative energy balance and lipidosis |
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How do you prevent Fat Cow Syndrome?
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-Dietary management of stock during late lactation and dry period
-Prompt treatment of peri-parturient diseases -adequate protein is critical in the dry period |
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What will pathologies will you find in a liver of a cow that suffered fat cow syndrome on necropsy? (3)
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1) Enlarged yellow and swollen liver
2) Floats in formalin 3) Fatty infiltration of hepatocytes *Search carefully for other diseases |
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How do you diagnose ketonuria in a cow with Fat Cow Syndrome?
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Ketone strips
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Why can't you use prednisolone in ruminants?
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Don't use oral corticosteroids bc of the rumen
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How do you prevent Fat Cow Syndrome?
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-Dietary management of stock during late lactation and dry period
-Prompt treatment of peri-parturient diseases -adequate protein is critical in the dry period |
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How can you make sure to prevent obesity in late lactation?
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-12-13 month calving interval
-match requirements to milk production in late lactation -make changes before the dry period |
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What will pathologies will you find in a liver of a cow that suffered fat cow syndrome on necropsy? (3)
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1) Enlarged yellow and swollen liver
2) Floats in formalin 3) Fatty infiltration of hepatocytes *Search carefully for other diseases |
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How do you diagnose ketonuria in a cow with Fat Cow Syndrome?
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Ketone strips
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Why can't you use prednisolone in ruminants?
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Don't use oral corticosteroids bc of the rumen
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How can you make sure to prevent obesity in late lactation?
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-12-13 month calving interval
-match requirements to milk production in late lactation -make changes before the dry period |
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How do you make sure to provide adequate protein during the period in order to prevent Fat Cow Syndrome?
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-Good quality roughage
-Additional grain 2-4 weeks prior to calving to allow adjustment to the expected post calving ration |
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What animals get protein- energy malnutrition?
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Disease of pregnant beef cows on marginal diets
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When do the signs of protein-energy malnutrition arise?
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In winter
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What are 3 reasons that protein-energy malnutrition arises in winter?
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1) Increased energy demands from inclement weather and developing fetus
2) Heifers predisposed (growth demands) 3) Primary diseases, snow cover, unpalatable feed |
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What are the clinical signs of protein-energy malnutrition?
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Syndrome of weight loss, weakness and depression
-animals often thin w/ a long hair coat -Die in 7-14 days of becoming recumbent |
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What are 4 components of diagnosing protein-energy malnutrition?
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1) Rule out other possible causes
-keep open mind 2) Demonstrate inadequate caloric intake -take feed samples, pictures, look at whole property 3) Ketonuria unusual -bc no energy drain 4) Look for metabolic bone disease -Cows with huge heads- not enough calcium and too much phosphorus--> bony proliferation |
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Is treatment of protein-energy malnutrition very successful?
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No, usually difficult and unrewarding
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What are 3 components of treating protein-energy malnutrition?
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1) Force feeding alfalfa slurry
2) Propylene glycol -glucose precursor 3) Address concurrent disease (s) -micronutrient deficiencies |
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What are 3 findings on necropsy of an animal with protein-energy malnutrition?
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1) Atrophy of fat
2) Pathologic fractures 3) Poor rumen development |
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What are 4 ways to prevent protein-energy malnutrition in beef cattle?
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1) Appropriately address energy requirements of 3rd trimester and in cold weather
2) Provide good quality forage in adequate amounts 3) Maintain good BC scores (5-7) in cows entering third trimester 4) Look at your cattle |
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When does pregnancy toxemia occur in ewes and does?
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Final 2-4 weeks gestation
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What is the pathophysiology of pregnancy toxemia?
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Inability to meet energy demands w/ rapid fetal growth and inadequate caloric intake
-nutritional and physiological stress increase the incidence |
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What ewes usually get pregnancy toxemia?
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Ewes with >1 fetus
-affected ewes often in very good body condition |
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When does pregnancy toxemia occur in ewes and does?
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Final 2-4 weeks gestation
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What are the clinical signs of pregnancy toxemia?
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-Anorexia, weakness, and depression
-Separation from the herd -Apparent blindness -Tremors, star gazing, ataxia, circling and bruxism |
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What is the pathophysiology of pregnancy toxemia?
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Inability to meet energy demands w/ rapid fetal growth and inadequate caloric intake
-nutritional and physiological stress increase the incidence |
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What are the differential diagnoses for a blind small ruminant that is walking around that is not pregnant?
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-Thiaminase
-Sulfur toxicity -Listeria -lead toxicity -salt toxicity |
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What ewes usually get pregnancy toxemia?
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Ewes with >1 fetus
-affected ewes often in very good body condition |
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What are the clinical signs of pregnancy toxemia?
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-Anorexia, weakness, and depression
-Separation from the herd -Apparent blindness -Tremors, star gazing, ataxia, circling and bruxism |
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What are the differential diagnoses for a blind small ruminant that is walking around that is not pregnant?
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-Thiaminase
-Sulfur toxicity -Listeria -lead toxicity -salt toxicity |
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What do you find on physical exam and lab findings of an animal with pregnancy toxemia?
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-Ketonuria
-acidosis w/ low serum K+ and calcium -elevated FFA and BHB -Does may develop marked neutrophilia (stress?) |
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What do you find on necropsy of an animal with pregnancy toxemia?
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Friable and fatty liver
|
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What is the mortality of pregnancy toxemia?
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High without aggressive therapy
-economic question of mom or fetus |
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What is the treatment of pregnancy toxemia?
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1) C-section or induce parturition
-Dexamethason in ewes 2) Continuous infusion of glucose 3) Adjunct therapies -B vitamins for gluconeogenesis, transfaunation -Glucose precursors: propylene glycol, calcium propionate |
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What are 3 components of preventing pregnancy toxemia in does and ewes?
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1) Predisposed if they enter 3rd trimester over or under-conditioned
2) Provide excellent quality forage 3) Serial measurement of plasma BHB to assess nutritional adequacy |
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What large animals most commonly get hyperlipemia/ hyperlipidemia?
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Ponies, donkeys and miniature horses
|
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What is hyperlipemia/ hyperlipidemia associated with? What animals are predisposed?
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A sudden drop in dietary carbohydrates
-sudden starvation or anorexia -Lactating animals predisposed -fat mobilization w/ hepatic accumulation |
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What causes hyperlipemia/ hyperlipidemia?
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Production of an abnormal VLDL
|
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Why are horses predisposed to hyperlipidemia/ hyperlipemia?
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Make huge lipoproteins (package into giant fat molecules) and they get stuck in capillaries like in the feet, liver and kidney
|
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What is hyperlipidemia?
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Mild metabolic dysfunction with mild elevation of triglycerides
<500 mg/dL and plasma is clear -no evidence of hepatic dysfunction |
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What is the treatment for hyperlipidemia?
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Usually readily reversible if caloric intake increased
|
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Why does hyperlipidemia often occur when animals are azotemic?
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Prevents lipid removal from the blood by inhibiting LPL
|
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What is hyperlipemia?
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More severe dysfunction
Triglycerides>>>500 mg/dL |
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What are the clinical signs of hyperlipemia? (3)
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1) Anorexia, depression, weakness, incoordination and diarhea
2) White coating of tongue and concurrent myopathy common 3) Insulin resistant hyperglycemia |
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What is the mortality of hyperlipidemia?
|
often high
|
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*Why is laminitis a frequent complication of hyperlipemia/ hyperlipidemia?
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Giant fat molecules can get stuck in the feet --> laminitis
|
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What are 4 sequela to hyperlipemia/ hyperlipidemia syndromes?
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1) Severe metabolic dysfunction and death
2) Liver rupture -hemoabdomen and sudden death 3) Laminitis a frequent complication 4) Lipid can accumulate in liver, kidney, heart and skeletal muscle and cause signs associated with dysfunction of these organs |
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What are 6 components to diagnosing hyperlipemia/ hyperlipidemia?
|
1) History
2) Triglycerides 3) White or yellow opalescence of plasma 4) elevated bilirubin and FFA's 5) Metabolic acidosis in severe cases 6) Ultrasound -hepatomegaly -increased echogenicity -some loss of normal hepatic architecture |
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What are 3 components to treating hyperlipemia/ hyperlipidemia?
|
1) Correct primary disease to alleviate anorexia
-teeth? 2) Correct negative energy balance -IV dextrose infusions -force feeding alfalfa slurry and/ or complete diets -intravenous nutrition 3) Insulin reduces fat mobilization |