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Diabetes Mellitus
Presented by…Rajeev MishraL-2015-V-38-MVeterinary MedicineGADVASU, Ludhiana
Diabetes Mellitus
Disease in which the body doesn’t produce or properly use insulin, leading to hyperglycemia.
Diabetes is a life-long disease marked by high levels of glucose in the blood
It can be caused by too little insulin, resistance to insulin, or both
Pancreas
The pancreas functions as both an exocrine and an endocrine gland
Exocrine function is associated with the digestive system because it produces and secretes digestive enzymes
Endocrine Function: produces two important hormones in Islets of Langerhans, insulin and glucagon
Pancreatic Hormones
Insulin (beta cells) stimulates the uptake of glucose by body cells thereby
decreasing blood levels of glucose
Glucagon (alpha cells)
stimulates the breakdown of glycogen and the release of glucose, thereby increasing blood levels of glucose
Glucagon and insulin work together to
regulate & maintain blood sugar levels
Action of Insulin on the Cell Metabolism
Functions of insulin
Enables glucose to be transported into cells for energy for the body
Converts glucose to glycogen to be stored in muscles and the liver
Facilitates conversion of excess glucose to fat
Prevents the breakdown of body protein for energy
What goes wrong in diabetes?
Multitude of mechanisms Insulin
Regulation Secretion Uptake or breakdown
Beta cells damage
Frequency
Dogs: 1:100 reaching 12 yrs will develop DM
Cats: 1:50-1:500 Prevalence increasing over time: aging
population, obesity, physical inactivity
Signalment
Dogs: female : male 2-3:1 7-9 yrs of age Rare form of congenital lack of β cells
Cats: >95% >5 yrs of age 70-80% male Majority are overweight, few underweight
Genetic Predisposition
German Shepherd Dogs Schnauzers Beagles Poodles Golden retrievers & Keeshonds: more prone
to juvenile diabetes Cats: Burmese??
Etiology: Dogs
Risk factors: genetic, environmental, insulin antagonistic rx (GC’s and megestrol acetate), & diseases (e.g. pancreatitis)
Immune-mediated destruction of islets occurs leading to B-islet cell dysfunction relative or absolute deficiency of insulin
Etiology: Dogs
Progression is slow; likely >90% of islets are lost before DM occurs
Is the most common disorder of the endocrine pancreas
Etiology: Cats
Most Type II Multifactorial:
Obesity: 4 X more likely to develop DM Pancreatitis Genetics? Drugs: GC’s, progestins Amyloidosis of the pancreatic cells
Etiology: Cats
Factors lead to impaired insulin action in liver, muscle and adipose tissue and β–cell failure hyperglycemia
If some β–cell function exists, diabetes may be transient
Diabetes Mellitus
There are two major types of diabetes: Type 1 Diabetes Type 2 Diabetes
Aetiology of DiabetesAetiology of Diabetes
Type One Diabetes results when the body’s immune system
destroys its own beta cells in the pancreas. No insulin production is then possible.
Type Two Diabetesresults from either
Insulin resistance (overweight patients) Inadequate insulin production (lean
patients) A combination of both
Type I Diabetes Cell
Type II Diabetes
Insulin levels may be normal, elevated or depressed Characterized by insulin resistance, Diminished tissue sensitivity to insulin, Impaired beta cell function (delayed or
inadequate insulin release)Risk factors: family history, sedentary lifestyle,
obesity and aging
What is Insulin Resistance?
Condition in which the body does not utilise insulin efficiently
Insulin resistance is the decreased response of the liver and peripheral tissues (muscle, fat) to insulin
Insulin resistance is a primary defect in the majority of patients with Type 2 diabetes
Type II Diabetes
Characteristics of DiabetesType 1 Type 2
Rapid onset Normal or underweight Little or no insulin Ketosis common Autoimmune plus
environmental factors Low familial factor Treated with insulin, diet
and exercise
Gradual onset 80% are overweight Most have insulin resistance Ketosis rare Part of metabolic insulin resistance
syndrome Strongly hereditary Diet & exercise, progressing to
tablets, then insulin
Clinical manifestations
Clinical Signs : Dogs
pU/pD due to hyperglycemia and 2° osmotic diuresis
Polyphagia and weight loss Dehydration Cataracts in dogs; rare (?) in cats Fatigue, nausea, vomiting
Clinical Signs: Cats
Icterus common with DKA Plantigrade stance ~10%
Ketoacidosis
In addition to high glucose levels, acutely ill type 1 diabetics have high levels of ketones. As cells cannot get glucose, they burn fats as an alternate
energy source Ketones are produced by the breakdown of fat and muscle, and
are toxic at high levels Ketones in the blood cause a condition called "acidosis” or
“ketoacidosis" (low blood pH) Urine testing detects ketones in the urine Blood glucose levels are also high.
Cataract
Develop frequently in dogs Related to unique sorbitol pathway
by which glucose is metabolized in the lens
Edema of lens
Disruption of normal light transmission
DIAGNOSIS
Fasting BG >200 mg/dl & glucosuria
Fructosamine: supports sustained hyperglycemia
Urine dipsticks for home use if stress hyperglycemia suspected
DIFFERENTIALS
Hyperthyroidism GI lymphoma Hepatic disease Renal disease Pancreatitis Hyperadrenocorticism
DIFFERENTIALS for Hyperglycemia
Dextrose-containing fluids Parenteral nutrition Diestrus, pheochromocytoma (dogs) Acromegaly (Cats) Head trauma Exocrine Pancreatic Neoplasia
CLINICAL PATHOLOGY
CBC: +/- normal, anemia, stress leukogram
Profile: hyperglycemia, ↑ ALT/SAP, ↑ cholesterol, ↑ bilirubin (cats)
UA: proteinuria, pyuria
CLINICAL PATHOLOGY
UA: renal threshold for glucose: Dogs:180-220 mg/dl Cats: 240-300 mg/ld Culture!!: Up to 40% will have a UTI w/o an
active sediment
Blood Pressure
TREATMENT(for the non-ketotic diabetic)
Work to establish Euglycemia over time
Insulin types: Short acting (Regular) Intermediate acting (NPH, Glargine, PZI,
ProZinc) Long acting (Ultralente-no longer available)
NPH/Lente
Dogs and cats BID dosing needed with 2 meals of equal
calories
DOGS: 0.25-0.5 units/kg BID CATS: 1-3 units BID
Protamine Zinc InsulinProZinc
U-40 concentration, app’d for cats BID dosing most common Start @ 1U/cat BID Dogs: not rec’d d/t unpredictable onset &
duration of action Glargine insulin: in newly diagnosed cats
ORAL HYPOGLYCEMIC AGENTS
Sulfonylureas Glipizide @ 2.5mg,bid Cats Glimepiride @2mg sid Meglitinides Biguanides Thiazolidinediones Alpha-Glucosidase inhibitors acarbose
in cats @12.5-25mg,bid-tid in congunction with diet
Oral Hypoglycemic agents
Only work if functional B cells are present
Acarbose: delays absorption of glucose from SI, delays digestion of complex carbs thus decreasing PP hyperglycemia
BUT: side effects=diarrhea and weight loss
Cornerstones of Diabetes Management
Healthy eating/ nutrition Exercise Monitoring Medication/Insulin
Medical Nutrition Therapy
Primary Goal – improve metabolic control
Blood glucose Lipid (cholesterol) levels CATS: low carbohydrate, high protein,
mod-high fiber DOGS: low fat, high fiber
Medical Nutrition Therapy
Increase fiber >12% slowly fermentable , insoluble fiber or >8% moderately fermentable fiber
Maintain short and long term body weight
Prevent or treat complications Improve and maintain nutritional
status
EXERCISE
To encourage weight loss To decrease insulin resistance induced
by obesity
Thank You