2850 Pathophysiology Exam Three Flashcards
What is the leading cause of lung cancer?
Cigarette smoking
What are additional causes of lung cancer?
Genetics
Asbesto exposure
What naturally occurring radioactive material causes 12% of all lung cancers?
Radon
How do smoke and environmental toxins damage the respiratory tract?
They paralyze the cilia, leading to carcinogen accumulation
Describe the disease process progression that happens when a respiratory tract lesion occurs
The lesion changes from hyperplasia to dysplasia (precancerous) to an invasive neoplasia (cancerous mass)
Why do lung cancer cells multiply rapidly and extensively?
Oncogene activation
Deactivation of tumor suppressor genes
Lack of cellular apoptosis
What are the two major categories of lung cancer?
Non small cell lung cancer and small cell lung cancer
What are the most common sites of metastasis of small cell lung cancer?
Hilar and mediastinal lymph nodes
How are lung cancers staged?
Stage 0-4
Stage 0 lung cancer
Small localized tumor (“in situ” tumor)
Stage one lung cancer
Large tumor
Stages 2-3 lung cancer
Tumor spread to lymph nodes
Stage 4 lung cancer
Metastasis has occurred
What are major presenting complaints in lung cancer?
Cough Hemoptysis Wheeze Strider Chest pain Dyspnea
What is a common paraneoplastic syndrome involving a lung tumor?
Tumor secretion of ACTH, which resembles melanocyte stimulating hormone, causing melanin release which makes the patient look very tan
What are the three ways that lymphomas are staged?
By grade, stage, and letter
Grade of lymphoma
Rate of growth, where a high grade is worse
Describe a high grade lymphoma
Rapid growth, very aggressive, much less curable and requires immediate intensive treatment
What does stage of lymphoma refer to?
Regions involved
What does letter of lymphoma refer to?
Symptoms and spread
Describe a stage IV lymphoma
Spread outside of lymph nodes and spleen to the organs (bone marrow, CNS)
What is often the first sign of lymphoma?
Painless enlarged lymph nodes (often in neck, under arm, or in the groin)
What are some other signs and symptoms of lymphoma?
Enlarged spleen or liver Night sweats Fever Chills Weight loss Pain/swelling from enlarged lymph nodes pressing on other things
What is the etiology of non-Hodgkins lymphoma?
Genetic influence (chromosomal translocations)
What cells are involved in non-Hodgkins lymphoma?
Lymphocytes (usually B cells)
What determines a tumor’s aggressiveness?
Pattern of growth and cell size
What infections may predispose a person to NHL?
EBV
HIV
hep C
H. Pylori (gastric ulcers)
What are some common causes of Hodgkin’s lymphoma?
EBV/other viruses
Carcinogens
genetic/immune mechanisms
What cell mutation is unique to Hodgkin’s lymphoma?
Reed-Sternberg cells
Describe Reed-Sternberg cells common to HL
Large malignant B cells with 2 nuclei
What are some common signs and symptoms of Hodgkin’s lymphoma?
Sore throat
Fever
Painless enlargement of lymph tissues/modes
What is Waldeyer’s ring?
Circular arrangement of lymphoid tissue in pharynx that is unique to Hodgkin’s lymphoma
What are the leading causes of chronic renal failure?
diabetes
Hypertension
Glomerulonephritis
Polycystic kidney disease
What is the normal GFR?
90-120 mL/min
Why are patients with stage 1 and 2 kidney disease usually asymptomatic?
Because functioning nephrons compensate for the damaged ones (we can function normally on 50% of our nephrons)
What alterations in lab values will be seen in patients with stage 3 kidney disease?
Decreased GFR
Increased BUN and creatinine
Decreased creatinine clearance
What characterizes stage 4 kidney disease?
GFR at 20% of normal
Nephrons are overwhelmed
Protein should be restricted
What characterizes stage 5/end stage kidney disease?
GFR at 5% of normal
Widespread uremia
Loss of ability to maintain BP and acid/base balance
What causes the systemic symptoms seen in CKD?
Accumulation of nitrogenous wastes
What do patients with CKD develop thrombocytopenia and anemia?
Platelets and RBCs lyse in a high nitrogen environment
What are the dangers of hypercalcemia in CKD?
Cardiac dysrhythmias and extreme muscle weakness
What happens when the kidneys cannot activate vitamin D?
Calcium absorption from the GI tract decreases, leading to hypocalcemia, which can cause neuromuscular irritability, tetany, and seizures
Define renal osteodystrophy
Excessive PTH release due to hypocalcemia leads to bone demineralization and breakdown
Normal fasting blood glucose
70-100 mg/dL
Hypoglycemia blood glucose level
Less than 70 mg/dL
What blood glucose level indicates diabetes?
Fasting greater than or equal to 126 mg/dL on three separate screenings
What does insulin do after carbs are ingested in a meal?
Insulin makes cells permeable to glucose, causing rapid uptake, storage, and use
What does insulin do when the quantity of glucose entering the liver cells is more than can be stored as glycogen?
Insulin promotes the conversion of glucose into fatty acids, which are stored as adipose tissue
Hyperinsulinism
Body cells becoming insulin resistant, so pancreas tries to compensate by increasing insulin secretion
What happens if the pancreas secretes excessive insulin but the cells are not insulin resistant?
Severely low blood glucose can result
What are some additional roles of insulin in the body?
Inhibits use of fat for energy
Inhibits lipase action
Inhibits body protein breakdown
Promotes muscle building, fat storage, and glycogen formation
Enhances cellular permeability to amino acids
Where is glucagon secreted from?
Alpha cells of pancreatic islets
What does glucagon do?
Increases bloodstream glucose concentration by breaking down stored glycogen in the liver
Describe the regulation of glucagon secretion
Increased blood glucose inhibits glucagon
Decreased blood glucose causes it to be secreted
Type 1 diabetes
Deficient insulin due to autoimmune destruction of insulin secreting cells in pancreas
What do type one diabetics have autoantibodies to?
Islet cells, insulin, and enzymes involved in insulin production
What major processes cause type 2 diabetes?
Insulin resistance and pancreatic insulin deficiency
What happens when the pancreas becomes exhausted and cannot secrete sufficient insulin?
Blood glucose levels continuously climb
What is a major contributing factor to the development of T2DM?
Obesity
Why does obesity contribute to T2DM?
Fat cells are insulin resistant, so the body is overall more insulin resistant
What are risk factors for the development of T2DM?
Age Obesity Lack of physical activity HTN Pregnancy Hyperlipidemia
What are classic presenting symptoms of type 1 diabetes?
Polyuria
Polyphagia
Polydipsia
Why does polyuria happen in type 1 diabetes?
Excess glucose ends up in the urine, which draws more water in and results in more urine
Additional clinical manifestations of type 1 diabetes
Visual disturbances Fatigue Inability to concentrate Malaise/fatigue Weakness
What is often the presenting sign in type 1 diabetes?
Chronic UTI caused by candida infection
Classic symptoms of T2DM?
Polyuria
Polyphagia
Polydipsia
Why is DKA not typically a presenting feature of T2DM?
Because some insulin is present still
Goiter
Enlargement of the thyroid gland, with or without signs of thyroid dysfunction
What causes a goiter?
Excessive release of TSH from the pituitary gland
Why is sufficient iodine intake important?
Iodine is necessary for TH synthesis
What is the most common cause of hypothyroidism?
Primary hypothyroidism: no production of T3 and T4
Hypothyroidism risk factors
Age over 50 Female Caucasian Postpartum Radiation to neck Certain drugs
What is the most common risk factor for hypothyroidism?
Hashimoto’s thyroiditis, which is an autoimmune disorder
What are skin changes seen in hypothyroidism?
Hypercarotinemia (yellow orange skin due to carotene buildup)
What causes a puffy face in hypothyroidism?
Accumulation of sodium and water
What voice changes could be seen in hypothyroidism?
Hoarse voice
What metabolic changes occur in hypothyroidism?
Decreased LDL receptors, causing increased cholesterol and triglycerides
Decreased hematopoiesis, causing anemia
Decreased kidney function, causing risk for med toxicity
What are constitutional symptoms of hypothyroidism?
Cold intolerance Weight gain Lethargy Fatigue Muscle cramps Constipation Decreased fertility Hair loss Brittle nails
Myxedema
Severe adult hypothyroidism
What are some signs and symptoms of hypothyroidism in the elderly?
Disorientation, depression, and pseudo dementia
Hyperthyroidism
Excessive secretion of T3 and T4