The Endocrine System Image from: mages-system/endocrine-system-01.gif.
The Endocrine System
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Transcript of The Endocrine System
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The Endocrine System
• Consists of glands and other structures that produce hormones which are released into the circulatory system
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The Endocrine System
• Consists of glands and other structures that produce hormones which are released into the circulatory system
• Regulation is established through hormones affecting target tissue
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Regulation
• Homeostatsis is achieved through feedback mechanisms
• Negative feedback – negates change to bring levels back to normal
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Pituitary Gland
• Regulates other endocrine glands as well as other body activities
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Different hormones, different signals
Anteriorpituitary
Thyroidgland
TSHThyroidhormones
Negative feedback -
+
Hypo-thalamus
Waterabsorption
ADHosmolality
Negative feedback -
+
Pancreas
Liver, fat& muscle
InsulinGlucose
Negative feedback -
+
Para-thyroids
Bone, GIT& Kidney
PTHcalcium
Negative feedback -
+
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Growth Hormone
• Non-endocrine related disorders can also cause growth delay:– Intrauterine growth retardation, chromosomal
defects, abnormal growth of cartilage or bone, poor nutrition, variety of systemic diseases
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Growth Hormone
• Deficiency of endogenous growth hormone causes growth retardation
• Growth delay may be caused by– Family growth patterns, genetic disorders,
malnutrition, systemic or chronic illness, psychosocial stress, or a combination of these
– Endocrine deficiency, or problems with thyroxine, cortisol, insulin, or GH
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Growth Hormone
• Release of GH is stimulated by the release of GHRF secreted by the hypothalamus
• GH is inhibited by – Glucocorticoids– Obesity– Depression– Progesterone– Hypokalemia– Altered thyroid function
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Synthetic Human Growth Hormones
• somatrem (Protropin)• somatropin (Humatrope)
Drug List
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Growth Hormone
• The younger the patient at time of treatment the greater the height that may be achieved
• Little response is seen after age 15-16 in boys and 14-15 in girls
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Thyroid Gland
• Produces hormones (T3 and T4) that stimulate metabolic activity of body tissues
• Hypothalamus and pituitary glands work together to release TSH
• TSH stimulates T3 and T4 release
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Thyroid Hormone Feedback Loop
• Thyroid hormones build up in the blood• Signals are sent to the hypothalamic-
pituitary axis that adequate levels have been met
• TSH levels decrease
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Feedback
Anteriorpituitary
Thyroidgland
TSHThyroidhormones
Negative feedback -
+
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Hypothyroidism
• Production of thyroid hormones is below normal
• Cretinism occurs in children at birth due to inadequate maternal iodine intake– Can cause mental retardation, thick tongue,
lethargy, lack of response, short stature – can be corrected if treated
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Primary and secondary disorders
PrimaryThyroiddisease
SecondaryThyroiddisease
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Hypothyroidism Symptoms
• Apathy• Constipation• Decreased heart rate• Depression• Dry skin, nails, and
scalp• Easy fatiguing• Enlarged thyroid
• Lowered voice pitch• Myxedema• Puffy face• Reduced mental acuity• Swelling of eyelids• Tongue enlarged and
thickened• Weight gain
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Causes of Hypothyroidism
• Autoimmune destruction of the gland
• Radioactive iodine therapy
• Surgical removal of the gland
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Treatment for Hypothyroidism
• Thyroid replacement therapy– Should not be used to treat obesity
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Agents for Hypothyroidism
• levothyroxine, T4 (Levothroid, Levoxyl, Synthroid)
• liothyronine, T3 (Cytomel)• liotrix (Thyrolar)• thyroid (Armour Thyroid)
Drug List
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levothyroxine, T4 (Levothroid, Levoxyl, Synthroid)
• Used for chronic therapy
• Can be cardiotoxic
• Alters protein binding of other drugs
• Should not switch brands once stabilized
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levothyroxine Dispensing Issues
• Can be cardiotoxic; report any of the following:– Chest pain, increased pulse, palpitations, heat
intolerance, excessive sweating
Warning!
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levothyroxine Dispensing Issues
• Look-alike and Sound-alike Drugs:– levothyroxine (thyroid replacement)– levofloxacin (antibiotic)
Warning!
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Hyperthyroidism
• Excessive thyroid hormone• Most common cause is Grave’s disease• Other causes:
– Excessive exogenous iodine– Thyroid nodules– Tumor in the pituitary causing overproduction
of TSH
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Symptoms of Hypterthyroidism• Decreased menses• Diarrhea• Exophthalmos• Flushing of the skin• Heat intolerance• Nervousness• Perspiration• Tachycardia• Weight loss
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Agents for Hyperthyroidism
• methimazole (Tapazole)• propylthiouracil, PTU • radioactive iodine, 131I
Drug List
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Discussion
What are the treatment options for hyperthyroidism?
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Discussion
What are the treatment options for hyperthyroidism?
Answer: in children: surgery and hormone replacement; adults: surgery or medications
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Diabetes/Hypoglycemic Agents
• In the islets of Langerhans, in the pancreas, there are two primary specialized cells
• Alpha Cells
• Beta Cells
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Hypoglycemic Agents
• In the islets of Langerhans, in the pancreas, there are two primary specialized cells
• Alpha Cells– Produce glucagon and raise blood glucose levels
• Beta Cells
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Hypoglycemic Agents
• In the islets of Langerhans, in the pancreas, there are two primary specialized cells
• Alpha Cells– Produce glucagon and raise blood glucose levels
• Beta Cells– Produce insulin and lower blood glucose levels
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Insulin
• Helps cells burn glucose for energy• Works with receptors for glucose uptake• Enhances transport and incorporation of
amino acids into protein• Increases ion transport into tissues• Inhibits fat breakdown
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Diabetes
• Caused by inadequate secretion or utilization of insulin
• Leads to excessive blood glucose levels• Normal: 100 mg/dL
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Type I Diabetes
• Occurs most commonly in children and young adults
• Average age of diagnosis is 11 or 12• Patients are insulin dependent and have no
ability to produce insulin on their own• May be due to an autoimmune response• Type I accounts for 5-10% of diabetic
population
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Type II Diabetes
• Affect 80-90% of diabetics• Most patients are over 40 and more women
than men are affected• Could be caused by insulin deficiency or
insulin receptor resistance• Many of these patients are overweight and
can treat their diabetes with weight loss
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Gestational Diabetes
• Occurs during pregnancy• Increases risk of fetal morbidity and death• Onset is during the 2nd and 3rd trimesters• Can be treated with diet, exercise, and
insulin• 30-40% of women with gestational diabetes
will develop type II in 5-10 years
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Secondary Diabetes
• Caused by medications– Oral contraceptives– Beta blockers– Diuretics– Calcium channel blockers– Glucocorticoids– phenytoin
• May return to normal when drug is stopped
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Symptoms of Diabetes• Frequent infections• Glycosuria• Hunger• Increased urination and nocturia• Numbness and tingling• Slow wound healing• Thirst• Visual changes• Vomiting• Weight loss, easy fatigability, irritability, ketoacidosis
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Complications of Diabetes
• Retinopathy leading to blindness• Neuropathy • Vascular problems can lead to inadequate
healing which could lead to amputation • Dermatologic involvement• Nephropathy is the primary cause of end-
stage renal disease
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Lack of Insulin Activity
• Diabetics cannot use glucose therefore their bodies metabolize fat
• Gluconeogenesis is the formation of glucose from protein and fatty acids
• Fatty acid is oxidized into ketones
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Ketones
• Strong acids• Cause the body pH to drop• Excreted in the urine or eliminated through
respiration• Causes a fruity acetone smell on the breath
that can be mistaken for alcohol
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Treating Diabetes
• Treatment consists of diet, exercise, and medications
• Blood glucose monitoring must be done regularly throughout the day
• Type II diabetics may be able to control the disease through diet and exercise alone
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Treatment for Type II
1. Lifestyle changes2. Oral monotherapy3. Combination oral therapy4. Oral drug plus insulin5. Insulin only
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General Treatment Guidelines
• Attention to diet• Blood pressure control• Compliance with
medications• Control of
hyperlipidemia• Daily foot inspections• Increased physical
activity
• Recognizing hypoglycemia
• Blood glucose testing• Monitoring in the Dr’s
office• Patient education• Prompt treatment of
infections• Setting goals
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Drug for Lower Extremity Diabetic Ulcers
• becaplermin gel (Regranex)
Drug List
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Insulin
• Administered subcutaneously due to degradation in the GI tract
• Different types of insulin have different onset of action times and duration of action times
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Insulin Duration of Action
Type Duration of Action
Humalog, Novolog
1 hr (works in 15 mins and gone in about an hour)
Regular 5-6 hours (onset – 30 mins)
NPH 10-16 hours
Lente 12-18 hours
Lantus 24 hours
mixed Quick onset, longer duration
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Insulin Dispensing Issues
• It is very easy to grab the wrong insulin in the refrigerator
• Always double-check yourself• They look exactly alike
Warning!
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Insulin administration sites should be rotated
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Hypoglycemia
• Blood glucose levels of <70 mg/dL• Can be caused by
– Skipping meals– Too much exercise– Poor medication regimen– Certain drugs
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Signs & Symptoms of Hypoglycemia
• Confusion• Double vision• Headache• Hunger• Numbness and
tingling in mouth and lips
• Nervousness• Palpitations• Sweating• Thirst• Visual disturbances• Weakness
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Human Insulins
• NPH isophane insulin (Humulin N)• insulin aspart (NovoLog)• insulin glargine (Lantus)• insulin lispro (Humalog)• regular insulin (Humulin R)
Drug List
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insulin lispro (Humalog)
• Rapid-onset insulin• Can be injected immediately before or after
meals• May be used with a pump
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insulin aspart (NovoLog)
• Rapid-acting insulin analog• Each dose should be administered before
meals• May be used with a pump
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insulin glargine (Lantus)
• Synthetic long-acting insulin• Absorbed slowly and works over a 24-hour
time period• Works similarly to physiologic insulin
release
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Human InsulinsMixtures
• insulin aspart w/ protamine-insulin aspart (NovoLog Mix 70/30)
• insulin lispro w/ protamine-insulin lispro (Humalog Mix 75/25)
• insulin with zinc (lente) (Humulin L)• NPH-regular insulin (Humulin 70/30)
Drug List
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Oral Hypoglycemic Agents First- Generation
Sulfonylureas
• chlorpropamide (Diabinese)• tolbutamide
Drug List
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Oral Hypoglycemic AgentsSecond-Generation
Sulfonylureas
• glimepiride (Amaryl)• glipizide (Glucotrol, Glucotrol XL)• glyburide (DiaBeta, Glynase, Micronase)
Drug List
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glipizide (Glucotrol, Glucotrol XL)
• Taken with breakfast• Promotes insulin release from beta cells• Increases insulin sensitivity
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glipizide Dispensing Issues
• Look-Alike and Sound-Alike Drugs– Glucotrol – Glucotrol XL
Warning!
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glipizide Dispensing Issues
• Look-Alike and Sound-Alike Drugs– glipizide (Glucotrol, Glucotrol XL)– glyburide (DiaBeta, Glynase, Micronase)
Warning!
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Oral Hypoglycemic Agents
Enzyme inhibitors:• acarbose (Precose)• miglitol (Glyset)Biguanide:• metformin (Glucophage, Riomet)
Drug List
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metformin (Glucophage, Riomet)
• Decreases intestinal absorption of glucose and improves insulin sensitivity
• Has an effect on serum lipid levels• Best candidates are overweight diabetics
with high lipid profile
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Oral Hypoglycemic Agents Glitazones/Thiazolidinediones
• pioglitazone (Actos)• rosiglitazone (Avandia)
Drug List
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pioglitazone (Actos)
• Depends on the presence of insulin
• Liver enzymes should be carefully monitored
• May be taken without regard to food
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rosiglitazone (Avandia)
• Increases insulin sensitivity in muscle and adipose tissue
• Can be taken without regard to food
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Oral Hypoglycemic Agents
Meglitinides
• nateglinide (Starlix)• repaglinide (Prandin)
Drug List
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Oral Hypoglycemic Agents Combinations
• glipizide-metformin (Metaglip)• glyburide-metformin (Glucovance)• rosiglitazone-metformin (Avandamet)
Drug List
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Discussion
What does a diabetic have to be concerned with in relation to diet?
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Discussion
What does a diabetic have to be concerned with in relation to diet?
Answer: Eating at the same time everyday; to limit sugar intake by reading package labels