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Pathophysiology > Exam 2 > Flashcards

Exam 2 Flashcards

1
Q

Urinary Tract Obstructions

A

An interference with the flow of urine at any site along the urinary tract. Obstructions can be anatomical or functional.

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2
Q

Causes of upper urinary tract obstruction

A
  • Stricture or congenital compression of a calyx or junctions of the ureters
  • Compression from a tumor
  • Stones
  • Compression from abdominal inflammation and scarring
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3
Q

Obstructive uropathy

A

Anatomic changes in the urinary system caused by obstruction. Severity based on:

  • Location
  • Involvement of one or both sides
  • Completeness of the blockage (still some function?)
  • Duration
  • Cause
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4
Q

Effects of upper urinary tract obstruction

A

-Early response: Dialation (of the ureter, renal pelvis, calyces, and renal parenchyma)=smooth muscle hypertrophy and accumulation of urine above level of blockage.

  • If blockage nor relieved, dialation leads to enlargement
  • Glomerular/kidney damage. Thinning of renal cortex.
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5
Q

Hydroureter

A

Dilation of the ureter. Accumulation of urine in the ureter.

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6
Q

Hydronephrosis

A

Dilation of the renal pelvis and calyces proximal to a blockage-Enlargement of the renal pelvis and calyces.

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7
Q

How the body is able to partially counteract the negative consequences of unilateral obstruction

A
  • Compensatory hypertrophy
  • Hyperfunction

Causes the unobstructed kidney to increase the size of individual glomeruli and tubules, but not total number of functioning nepherons.

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8
Q

Postobstructive diuresis

A

Marked polyuria after relief of obstruction. Can cause dehydration and fluid/electrolyte imbalances.

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9
Q

Risk factors for postobstructive diuresis

A
  • Chronic, bilateral obstruction
  • Impairment of one or both kidneys to concentrate urine or reabsorb sodium
  • Hypertension
  • Edema
  • Congestive heart failure
  • Uremic encephalopathy
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10
Q

Kidney Stone

A

Masses of crystals, protein, or other substances that form within and may obstruct the urinary tract. Classified according to the minerals that make up the stone.

Can be located in kidneys, urterers, and bladder

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11
Q

Causes of lower urinary tract obstruction

A
  • Neurogenic bladder (Detrusor hyper-reflexia, Detruson areflex-inderactive)
  • Tumors
  • Prostate enlargement
  • Pelvic organ prolapse
  • Urethral stricture
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12
Q

Effects of lower urinary tract obstruction

A
  • Incontenance (Stress, urge, overflow, mixed, functional)
  • Frequent voiding
  • Nocturia
  • Poor force of stream
  • Intermittent stream
  • Feelings of incomplete bladder emptying
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13
Q

Pathophysiology of kidney stones

A
  • Supersaturation of one or more salts
  • Precipitation of a salt from liquid to solid state
  • Growth into a stone via crystallization or aggregation
  • Lack of crystal growth inhibitors
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14
Q

Types of stones

A
  • Calcium oxalate/phosphate
  • Struvite
  • Uric acid stones
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15
Q

Manifestations of kidney stones

A
  • Renal colic (moderate to severe flank pain that can radiate to the groin. Rhythmic contraction. )
  • Urgency
  • Frequent voiding
  • Nausea and vomiting (sometimes)
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16
Q

Calcium oxalate stones

A

Formed in alkaline urine. Most common

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17
Q

Struvite stones

A

Formed in alkaline urine. Contain Magnesium, ammonium, varying levels of matrix, and phosphate. Form staghorn configuration.

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18
Q

Uric acid stones

A

Form in people who excrete excessive uric acid in the urine, such as people with gouty arthritis.

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19
Q

Neurogenic bladder

A

General term for bladder dysfunction caused by neuro disorders. Lead to dyssynergia.

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20
Q

Dyssynergia

A

Loss of coordinated neural muscle contraction.

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21
Q

Types of neurogenic bladder

A
  • Detrusor hyperflexia

- Detrusor areflex

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22
Q

Detrusor hyperflexia

A

Overactive bladder syndrome. Bladder contracts before bladder is full.

Causes frequency, urgency, and nocturia

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23
Q

Detrusor areflex

A

Underactive bladder syndrome and may have symptoms of stress and overflow incontinence. Muscle not letting brain know it is full.

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24
Q

Causes of resistance to urine flow

A
  • Urethral stricture
  • Prostate enlargement (creates pockets where urine and bacteria sits/festers)
  • Pelvic organ prolapse (Uterine prolapse–bladder falls due to no support)
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25
Q

Signs of urinary obstruction

A
  • Frequent daytime voiding
  • Nocturia
  • Poor force of stream
  • Intermittency of stream
  • Urgency and hesitancy
  • Feeling of incomplete bladder emptying
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26
Q

Renal Tumors

A
  • Renal adenomas

- Renal cell carcinoma

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27
Q

Bladder tumors

A

-Transitional cell carcinoma: most common bladder malignancy. Most common in 60+ yr old men.

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28
Q

Renal adenomas

A

Benign. Encapsulated and located near the cortex of the kidney.

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29
Q

Renal cell carcinoma

A

50-60 year old man. Most common renal neoplasm.

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30
Q

Manifestations of renal tumors

A
  • Hematuria
  • Dull, aching flank pain
  • Palpable flank mass
  • Weight loss
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31
Q

Manifestations of Transitional cell carcinoma

A

-Gross painless hematuria

Metastisizes to lymph, liver, bones, and lungs.

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32
Q

Urinary tract infection

A

Inflammation of the urinary epithelium caused by bacteria

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33
Q

Types of UTI

A
  • Acute cystitis
  • Acute/Chronic pyelonephritis
  • Painful bladder syndrome/Interstitial cystitis
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34
Q

Acute cystitis

Cause and manifestations

A

Inflammation of the bladder due to E Coli and Staph. Most common in women.

  • Frequency
  • Dysuria (painful peeing)
  • Urgency
  • Lower abdominal and or puprapubic pain

Urine can back travel to kidneys.

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35
Q

Pyelonephritis

Risks

A

Infection of one or both upper urinary tracts

Most common risks: Urinary obstruction and reflux of urine from the bladder

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36
Q

Acute pyelonephritis

Pathophysiology, evaluation, and Manifestations

A

Acute Infection of both tracts spread by microorganisms along the ureters. Evaluation done by urine culture and urinalysis.

Manifestations include:

  • fever/chills
  • Flank/groin pain
  • Characteristic UTI symptoms: frequency, dysuria, and costovertebral tenderness may precede systemic symptoms
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37
Q

Chronic pyelonephritis

Pathophysiology, evaluation, and Manifestations

A

Persistent or recurrent infection of the kidney leading to scarring of one or both kidneys. Risk increases in people with renal infections and some type of obstructive pathogenic condition. Urinalysis and ultrasound used in evaluation.

Manifestations include:

  • Hypertension
  • Frequency
  • Dysuria
  • Flank Pain
  • Progression leads to kidney failure
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38
Q

Glomerularnephritis

A

Inflammation of the golmerulus caused by:

  • Primary glomerular injury (immunologic responses)
  • Secondary glomerular injury (Systemic disease)
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39
Q

Primary glomerular injury

A

Includes immunologic responses, ischemia, free radicals, drugs, toxins, vascular disorders, and infection

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40
Q

Secondary glomerular injury

A

Consequence of systemic diseases including diabetes mellitus, lupus, congestive heart failure, and HIV related kidney diseases

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41
Q

Glomerulonephritis mechanisms of injury

A

Activation of biochemical mediators of inflammation:

  • Deposition of immune complexes into the glomerulus
  • Antigens reacting in situ against planted antigens within the glomerulus

-Non-immune injury is related to ischemia, toxin exposure, drugs, vasular disorders, and infection

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42
Q

Glomerulonephritis manifestations

A

Onset may be sudden or insidious. Symptoms may be silent, mild, moderate, or severe.
Severe:
-hematuria
-proteinuria

  • oliguria (decreased output)
  • hypertension
  • edema
  • nephrotic sediment
  • nephritic sediment
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43
Q

Nephrotic sediment

A

Urine containing massive amounts of protein and lipids and either a microscopic amount of blood or no blood.

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44
Q

Nephritic sediment

A

Urine with the presence of blood with red cell casts, white cell casts, and varying degrees of protein (not severe)

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45
Q

Glomerular structure damages from Glomerulonephritis

A

Injury to the filtration membrane increaseing membrane permeability and reduces glomerular membrane surface area. GFR decreases.

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46
Q

Membranous nephropathy

A

Acute Glomerulonephritis. One of the most common causes of Glomerulonephritis. Caused by antibodies that cause inflammatory response.

Results in increased membrane permeability, thickening of glomerular membrane, and ultimately glomerular sclerosis.

Manifestations are proteinuria and nephrotic syndrome.

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47
Q

Chronic glomerulonephritis

A

Encompasses several glomerular diseases with a progressive course leading to chronic kidney failure. Diabetes mellitus and lupus are examples of secondary causes of chronic glomerular injury.

Manifestations include:

  • hypercholestremia
  • Proteinuria
  • tubular injury
  • Kidneys appear small with granular external surface
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48
Q

Nephrotic syndrome

A

The excretion of 3.5g or more of protein in the urine per day and is characteristic of glomerular injury. Often glomerular injury is permanent.

  • Massive proteinuria
  • Hypoalbuminemia
  • Edema
  • Hyperlipidemia (in blood) and hyperlipiduria (in urine)
  • Frothy urine

Chronic and requires lifetime of medication and dialysis.

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49
Q

Nephritic syndrome

A

Hematuria (usually microscopic) is present and red blood cell casts are present in the urine in addition to non-severe protein uria. Occurs due to inflammation of the glomeruli or glomerular membrane. Is reversible with control of inflammation.

  • Dark, cola-colored urine
  • Hematuria
  • Oliguria (low output of urine)
  • Azotemia
  • Hypertension
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50
Q

Oliguria

A

Low output of urine

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51
Q

Dysuria

A

Painful urination

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52
Q

Acute Kidney Injury

A

A sudden decline in kidney function with a decrease in glomerular filtration rate (GFR) and increase of Blood Uria Nitrogen (BUN) and createnine. BUN and createnine proportionate and rise together. GFR inverse.

Vlassified as prerenal, intrarenal, and postrenal

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53
Q

Anuria

A

No urine output

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54
Q

Renal insufficiency

A

25% of normal GFR

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55
Q

Renal failure

A

Significant loss of renal function that requires dialysis

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56
Q

End-stage renal failure

A

Renal function of less than 10% requiring dialysis or transplant

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57
Q

Prerenal AKI

A

Most common reason for Acute Renal Failure and is caused by impaired renal blood flow (hemorrhage/trauma). “Interruption of blood flow before the kidneys.”

GFR declines because of the decrease in filtration pressure. Sudden/severe drop in pressure to kidney (trauma, blood loss, hypotension, hypovolemia)

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58
Q

Intrarenal AKI

A

Problem is inside the kidney. Direct damage to kidney by infection, reduced blood supply in kidney, inflammation, toxins, drugs. “Structural change inside the kidney causes problem even if there’s enough blood flow”

Most common cause: Acute tubular necrosis.

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59
Q

Acute tubular necrosis

A

Most common cause of Intrarenal AKI. Lack of O2 to tissues in kidney(ischemia)/nephrotoxic drugs. Damage to tubules.

Causes oliguria.

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60
Q

Postrenal AKI

A

Caused by urinary obstructions that affect the kidneys. “After kidneys”

  • Stones
  • Tumors
  • Edema
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61
Q

Phases manifestations of AKI

A

Always 3 phases:

  • Initiation phase
  • Maintenance phase
  • Recovery phase
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62
Q

Initiation phase of AKI

A

Kidney injury is evolving. Prevention of injury is possible (onset of trauma). Is reversible.

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63
Q

Maintenance phase of AKI

A

Established kidney injury and dysfunction.
-BUN/createnine increased and GFR decreased
-Low urine output
Lasts weeks/months

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64
Q

Recovery phase of AKI

A

Kidneys now functioning and injury is repaired. GFR rises and BUN/Createnine is decreasing.

  • Normal output
  • Can last 1-2 years depending on severity of injury
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65
Q

Chronic Kidney Disease

A

Progressive loss of renal function that affects nearly every organ in the body.

Associated with hypertension, diabetes, intrinsic kidney disease (chronic glomerularnephritis)

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66
Q

Chronic Kidney Disease requirement

A

3 months or more of less than 60ml/min GFR

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67
Q

Azotemia

A

Increased levels of waste in the body. Measured in part by BUN and createnine

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68
Q

Uremia

A

Systemic symptoms associated as a result of azotemia (buildup of waste and toxins)

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69
Q

Kidneys excrete too much sodium when GFR declines

A

Hyponatrimia in blood=neuro problems

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70
Q

When kidneys don’t excrete enough potassium (oliguria magnifies effects)

A

Hyperkalemia. Dysrhythmia/heart failure

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71
Q

Metabolic acidosis

A

Chronic kidney disease. Kidneys unable to balance out H+ elimination with bicarbonate resorption. Respiration system will try to compensate.

Risk when GFR less than 25ml/min

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72
Q

CKD patients and diet

A

Don’t have to moniter sodium, but must monitor Potassium

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73
Q

CKD affects vitamin D absorption

A

Hypocalcemia=fracture risks

Phosphate excretion lowers, so affects vit D synthesis.

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74
Q

CKD affects metabolism

A

Increases risk for heart disease.

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75
Q

CKD causes anemia

A

RBC production drops because eurethropoitin production drops. Fatigue, dizzy

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76
Q

CKD affects of cardiovascular system

A
  • dislipidemia promotes buildup of plaque (cholesterol)
  • hypertension result of imbalance of water/sodium
  • Heart failure/stroke rates increase
  • anemia increases workload on heart (heart pumps faster to get less O2 through body)
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77
Q

CKD affects of pulmonary system

A

-Fluid overload. Kidneys can’t get fluid out, so fluid gets dumped in your lungs.

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78
Q

CKD affects of hematologic system

A
  • Anemia. Inadequate production of erythropoietin decreases RBC production.
  • Uremia decreases RBC life span
  • Alterations in thrombin and other clotting factors contribute to hypercoagulability (control of coagulation is essential during dialysis)
  • Increased bleeding tendancies causes bruising
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79
Q

CKD affects of immune system

A
  • Suppressed immune system

- WBCs might not respond appropriately to infections

80
Q

CKD affects of neurological system

A
  • headaches
  • pain
  • hyponatremia causes seizure/coma/muscle twitching
81
Q

CKD affects of GI system

A
  • Uremic gastroenteritis causes bleeding ulcers and hemorrhage
  • anorexia
  • nausea/vomiting
  • constipation
  • diarrhea
  • Uremic fetor (bad breath. Wastes leaving body through your mouth)
  • Malnutrition
82
Q

CKD affects of endocrine/reproductive system

A
  • Decreased testosterone (decreased libido)
  • Infertility
  • Insulin resistance in uremia(become diabetic)
  • Half life of insulin increased
  • Alterations of thyroid hormone metabolism
83
Q

CKD affects of integumentary system

A
  • Pallor from anemia

- bruising

84
Q

Anemia commonalitles and general causes

A

Reduction of total # of erythrocytes (reduction in quality or quantity of hemoglobin)

  • Impared erythrocyte production
  • Acute or chronic blood loss
  • Increased erythrocyte destruction
  • Combination of above
85
Q

Classic anemia manifestations

A
  • Fatigue (less O2)
  • Weakness (less O2)
  • Dyspnea (shortness of breath–lungs trying to compensate)
  • Increased heart rate (heart trying to pump a little O2 through the body)
  • Pallor (pale skin)
86
Q

Hypoxemia

A

Reduced oxygen level in the blood, further contributes to cardiovascular dysfunction by causing dilation of arterioles, capillaries and venules, thus increasing flow through them.

87
Q

Pernicious anemia

A

Macrocytic-normochromic
Caused by a lack of intrinsic factor (required for B-12 absorption) from the gastric parietal cells. GI tract can’t absorb B-12. Vitamin b-12 deficiency.

Causes:

  • atrophic gastritis
  • alcoholism

Manifestations:

  • Classic symptoms
  • NEURAL manifestations (nerve demylination)
  • –Gait issues, pins and needles feeling in toes and fingers, beefy red tounge, lemon-yellow skin
88
Q

Folate deficiency anemia

A

Macrocytic-Normochromic
Causes:
-Pregnancy
-Alcoholism (dietary)

Manifestations:
-Classic symptoms
(NO neural symptoms)
-Cheilosis
-Stomatitis 
-Mouth ulcers
89
Q

Microcytic-hypochromic anemias

A

RBC that are abnormally small and contain reduced amounts of hemoglobin

90
Q

Macrocytic-normochromic

A

RBC that are abnormally large and contain normal amounts of hemoglobin

91
Q

Iron deficiency anemia

A

Most common anemia. (Frequently associated with women of childbearing age due to periods)

Causes:
-Nutritional iron deficiency

Manifestations:
-Fatigue
-Weakness
-Shortness of breath
-pale ear lobes, palms, conjunctiva
Progression:
-Brittle, thin, coarsly ridged and spoon shaped nails
-A red, sore, and painful tongue
-Dry, sore corners of the mouth
92
Q

Sideroblastic anemia

A

Functional problem with the iron. Iron is present, but not functioning correctly.

Manifestations:

  • Common symptoms
  • Iron overload (enlarged liver and spleen)
  • Bronze colored skin
93
Q

Normocytic-normochromic

A

Not sufficient number of RBC

94
Q

Aplastic anemia

A

Pancytopenia. Reduction in all RBC, WBC, and platelets.

Manifestations:

  • Classic anemia symptoms
  • Reduced clotting
  • Reduced immune function
95
Q

Posthemorrhagic anemia

A

Acute blood loss. Lowers blood pressure. No symptoms are getting enough oxygen

96
Q

Hemolytic anemia

A

RBCs getting destroyed. Many causes.

Manifestations

  • Enlarged spleen
  • Jaudice
  • Hemolytic crisis
  • CV and respiratory anemia manifestations
97
Q

Relative Polycythemia

A

Overabundance of RBCs due to oversaturation because of dehydration (loss of fluid)

98
Q

Absolute polycythemia (primary)

A

True overproduction of RBC. Abnormality of stem cells in the bone marrow (polycythemia vera)

99
Q

Absolute polycythemia (secondary)

A

True overproduction of RBC. Increase in erythropoietin as a normal response to chronic hypoxia or in an inappropriate response to erythropoiten

100
Q

Polycythemia

A

Overproduction of RBC

101
Q

Manifestations of polycythemia

A

Manifestations due to increased blood volume which increases viscosity (blood becomes thicker) and leads to hypercoagubility.

  • Headaches
  • Increased blood pressure because of increased volume
  • Chest pain
  • Angina–myocardial infarctions (signs of clots)
  • Intense painful itchiness
102
Q

Neutrophilia

A

More neutrophils (evident in the first stages of an infection-left shift) Immature neutrophils are released into blood. Immature cells not able to do as much as a mature cell

103
Q

Neutropenia

A

Reduced neutrophils, mature or immature.

Causes:

  • Prolonged severe infection
  • decreased neutrophil production
  • Reduced survival
  • Abnormal neutrophil distribution and sequestrian
104
Q

Infectious monocucleosis

A

Infection of B lymphocytes. Commonly caused by Epstein-Barr virus.

Manifestations start mildly and progress:

  • Fever
  • Sore throat
  • Swollen cervical lymph nodes
  • Fatigue (can take several months to get over)
105
Q

Leukemia

A

Malignant disorder of the blood and blood forming organs.

Excessive accumulation of leukemic cells. Pancytopenia of cells crowd bone marrow because leukemic cells take all the room.

106
Q

Acute leukemia

A

Presence of undifferentialted or immature cells

107
Q

Chronic leukemia

A

Predominant cell is mature but doesn’t function normally

108
Q

85% of childhood leukemia

A

ALL

109
Q

Causes/risks of leukemia

A
  • Associated with other genetic disorders
  • Genetic translocations
  • Cigarette smokine, exposure to benzene, ionizing radiation
  • Infections with HIV or hep C
  • Drugs that cause bone marrow depression (cancer treatment)
110
Q

Manifestations of leukemia

A

*Remember: reduction of all blood cells, so manifestations are a hodgepodge of results from decreased RBC, WBC, and platelets.

  • Anemia
  • bleeding
  • Purpura-big spots
  • Petechiae-small pinpoint spots
  • Ecchymosis-decreased platelets
  • Hemorrhage-decreased platelets
  • DIC-Decreased platelets
  • Infection-Reduced WBC
  • Weight loss
  • Bone pain
  • Elevated uric acid
  • Liver, spleen, and lymph node enlargement

Chronic anemia more slowly and stealthily (insidious)

111
Q

Malignant lymphoma

A

Malignant transformation of a lymphocyte and proliferation of lymphocytes, histiocytes, their precursors, and derivitaves in lymphoid tissues
Two categories:
-Hodgkin
-Non-hodgkin

112
Q

Hodgkin lymphoma

A

Characterized by presence of Reed-Sternberg cells in lymph nodes. Spreads in an orderly fashion-from the neck down
Manifestations:
-Enlarged spleen
-Cervical, axillary, inguinal retroperitoneal nodes enlarged
-**Intermittant fever, weight loss, night sweats, pruritus(itchiness)

113
Q

Non-hodgkin lymphoma

A

Generic term for a diverse group of lymphomas. Doesn’t spread in an orderly fashion. Cancers of B, T, or NK cells. Includes multiple myloma.

114
Q

Multiple myeloma

A

Malignant proliferation of plasma cells-B cells

Infiltrate bone marrow and aggregate into tumor masses in skeletal system.
Manifestations:
-Hypercalcemia
-Renal failure secondary to hypercalcemia
-Proteinuria
-Bone leisions and bone pain

115
Q

Normal platelet count

A

<150,000/mm^3

116
Q

Platelet count that would cause hemorrhage from minor trauma

A

<50,000/mm^3

117
Q

Platelet count that would cause spontaneous bleeding

A

<15,000/mm^3

118
Q

Platelet count that would cause severe bleeding situations

A

<10,000/mm^3

119
Q

Causes of thrombocytopenia

A

Results from decreased platelet production, increased consumption, or both.

  • Hypersplenism
  • Autoimune diesease
  • Viral or bacterial infections that cause disseminated intravascular coagulation (DIC)
120
Q

Thrombosis

A

Blood clot in deep vein

121
Q

Characterizations and manifestations of alterations of platelet function

A

Increased bleeding time in the presence of a normal platelet count

Manifestations:

  • petechiae
  • purpura
  • Bleeding from GI tract
122
Q

Types of alterations of coagulation

A
  • Vitamin K deficiency
  • Liver disease

Impairs homeostasis-inability to promote coagulation and the developement of a stable fibrin clot

123
Q

Vitamin K deficiency

A

Necessary for synthesis and regulation of anticoagulants. Causes liver disfunction

124
Q

Liver disease

A

Causes a broad range of homeostatic dosorders

  • Defects in coagulation
  • Fibrinolysis
  • Platelet number and function
125
Q

Disseminated Intravascular Coagulation (DIC)

A

Clots and bleeding. Widespread activation of coagulation, resulting in formation of clots in medium/small vessels throughout the body. Clotting may cause consumption of platelets and clotting factors leading to severe bleeding.

Clotting factors and platelets all being used to form clots.

Manifestations:

  • Hemorrhage
  • Bleeding from venipuncture sites/arterial lines
  • Purpura, petechiae, and hematomas
  • Cyanosis of fingers and toes (blue tint)
126
Q

Thrombus

A

Clot

127
Q

Embolus

A

Clot that has broken free and is moving in the bloodstream

128
Q

Virchow triad

A

The risk for developing spontaneous thrombi. 3 factors:

  • Injury to the blood vessel endothelium
  • Abnormalities to blood flow
  • hypercoagulabiltiy of the blood
129
Q

Examples of injury to blood vessel endothelium in relation to Virchow triad

A
  • Atherosclerosis
  • Smoking
  • Endotoxins
  • Hypertension
130
Q

Examples of abnormalities to blood flow in relation to Virchow triad

A
  • Atherosclerosis
  • Bedrest
  • Malignancy
  • Surgery
  • Sickle cell anemia
  • Myocardial infraction
131
Q

Examples of hypercoagulability of blood in relation to Virchow triad

A

-Polycythemia

132
Q

Symbiosis between humans and microorganisms

A

Benefits only the human; no harm to microorganism

133
Q

Mutualism between humans and microorganisms

A

Benefits the human and the microorganism

134
Q

Commensalism between humans and microorganisms

A

Benefits only the microorganism; no harm to the human

135
Q

Pathogenicity between humans and microorganisms

A

Benefits the microorganism; harms the human

136
Q

Oppoortunism between humans and microorganisms

A

Situation that occurs when benign organisms become pathogenic because of decreased human host resistance

137
Q

Communicability

A

Ability to spread from one individual to others and cause disease-for example, measles and pertussis spread very easily. HIV is of lower communicability

138
Q

Immunogenicity

A

Ability of pathogens to induce an immune response

139
Q

Infectivity

A

Ability of the pathogen to invade and multiply in the host

140
Q

Mechanism of action

A

Manner in which the microorganisms damages tissues

141
Q

Pathogenicity

A

Ability of an agent to produce disease—success depends on communicability, infectivity, extent of tissue damage, and virulence

142
Q

Portal of entry

A

Route by which a pathogenic microorganism infects the host

143
Q

Toxigenicity

A

Ability to produce soluble toxins or endotoxins, factors that greatly influence the pathogen’s degree of virulence

144
Q

Virulence

A

Severity of affect—for example, measles virus is of low virulence; rabies virus is highly virulent

145
Q

Endotoxins

A

Released during destruction of bacteria. Contained in cell wall of some bacteria. Breaks down>enters blood stream

Bacteria that produce endotoxins cause fever from inflammatory process

146
Q

Exotoxins

A

Released during bacterial growth. Enzymes with specific target cells.

Immunogenic and elicit production of antibodies

147
Q

Bacteremia

A

Presence of bacteria in the blood

148
Q

Septicemia

A

Growth of bacteria in the blood. Results from breakdown of body’s defense mechanisms

149
Q

6 Phases of viral replication

A
  1. Adsorption-Virion adds itself to cell membrane
  2. Penetration-enzymes break through membrane
  3. Uncoating-virus exposed
  4. Replication
  5. Assembly and maturation of replicas
  6. Release-spreads to other host cells
150
Q

Clinical manifestations of infection

A

Begins with nonspecific symptoms

  • FEVER
  • fatigue
  • malaise
  • weakness
  • loss of concentration
151
Q

Predictable stages of infection

A
  • infection
  • incubation
  • symptom stage
  • shedding of microorganism
152
Q

Vaccines

A

Preparation of weakened or dead pathogens

153
Q

Types of vaccines

A
  • Attenuated (live virus)
  • Killed (inactivated virus)
  • Toxoids (purified toxins that are used against the disease toxins)
154
Q

Primary (congenital) immune deficiency

A

Caused by a sporadic genetic defect. Most manifest in childhood.

155
Q

Secondary (aquired) immune deficiency

A

Caused by cancer, infection, or normal changes (aging)

Usually doesn’t greatly increase infection (HIV exception)

156
Q

Typical routes of transmission for HIV

A

Blood borne pathogen.

  • blood/blood products
  • IV drug abuse
  • sexual activity
  • maternal-child transmission
157
Q

HIV/AIDS manifestations

A
  • At first, symptoms mimic flu like symptoms

- Susceptible to opportunistic infections (fungal, bacterial, viral, neoplasms)

158
Q

Treatment and prevention of HIV

A
  • HAART medications (antiretrovirals)
  • Safe sex
  • No drugs
159
Q

Allergy

A

Hypersensitivity to environmental antigens

160
Q

Hypersensitivity

A

Altered immunologic reactions to an antigen that results in disease or damage to the individual

161
Q

Autoimmunity

A

Disturbance in the immunologic tolerance of self-antigens

162
Q

Alloimmunity

A

Individual produces reactions against tissues of another (blood transfusions/fetus during pregnancy/transplant)

163
Q

Type I hypersensitivity reactions

A

Allergies. Mast cell products: histamine

164
Q

Type II hypersensitivity reactions

A

Tissue specific reactions. Symptoms determined by what tissue is being attacked.

165
Q

Type III hypersensitivity reactions

A

Immune complex reactions. Antibodies formed in circulation cause damaging inflammation. Systemic affects all over. (serum sickness)

166
Q

Type IV hypersensitivity reactions

A

Cell mediated reactions. Mediated by T lymphocytes and don’t involve antibodies.

167
Q

Hyperacute rejection reactions

A
  • Immediate and rare
  • usually happen due to preexisting antibody toward grafted tissue (occurs when circulation reestablished to graft site)
  • Type 2 hypersensitivity reaction
168
Q

Acute rejection reaction

A
  • Cell mediated
  • Happens days to months after transplant
  • Body develops an immune response against unmatched HLA antigens
169
Q

Chronic rejection reactions

A
  • Slow progressive organ failure
  • Months to years after transplant
  • Type 4 hypersensitivity reaction
170
Q

Cancer

A

Refers to malignant tumors

171
Q

Tumor/Neoplasm

A

New growth

172
Q

Benign

A

Not cancer. Well differentiated cells and encased in stoma. Do not spread

173
Q

Malignant

A

Tumors with more rapid growth rates and specific microscopic alterations. Lack of organization

174
Q

Metastasis

A

Spread of cancer cells to distant tissues & organs of the body

175
Q

Carcinoma in situ

A

Early stage growths, may:

  • Remain stable
  • Progress to metastatic cancer
  • regress and disappear

Common in cervix

176
Q

Anaplasia

A

Loss of differentiation in malignant neoplasms

177
Q

Pleomorphia

A

Variety of sizes and shapes of cancer cells in malignant neoplasms

178
Q

Tumor markers

A

Produced by both benign and malignant tumors. Present in or on tumor cells. May be found in blood, spinal fluid, or urine. Helps healthcare workers screen and ID people at high risk and diagnose specific cancers.

  • Hormones
  • enzymes
  • genes
  • antigens
  • antibodies
179
Q

Characteristics of cancer cells in the lab

A
  • Transformed cells (created from normal cells.)
  • Contact inhibition (crowd and grow on each other)
  • Anchorage independent (Continue to divide when suspended)
  • Immortality (evade apoptosis)
180
Q

Changes in genes occurring in cancer

A
  • Point mutations (small scale changes in DNA)
  • Translocations & duplication (large scale changes in chromosomal structure.)
  • Gene amplification (Epigenetic changes. Activates oncogenes and results in increased expression of oncogene)
181
Q

Oncogene

A

Mutant gene which accelerate proliferation

182
Q

Tumor-suppressor genes

A

Put the brakes on cell proliferation

183
Q

Epigenetic silencing

A

Chemical modifications that alter expression of genes

184
Q

Loss of heterozygosity

A

Loss of one copy of a chromosome region in a tumor-unmasks mutations

185
Q

Apoptosis

A

Self-destruction of cells

186
Q

Telomeres

A

Protective ends of each chromosome

187
Q

Cancer metabolism

A
  • Cancer cells divide rapidly
  • Most often grow in hypoxic and acidic environments
  • Cancer loves glucose
  • Cancers are parasites
188
Q

Chronic inflammation and cancer

A
  • Active immune response in chronic inflammation predisposes to cancer
  • Inflammation and cancer have a lot in common
  • Combating inflammation leads to cancer eventually
189
Q

Bacterial causes of cancer

A
  • H. Pylori infection
  • Gastric carcinoma
  • Peptic ulcer disease
190
Q

Viral causes of cancer

A
  • Hep B/Hep C
  • Ebstein-Barr virus
  • Herpes
  • HPV
191
Q

Paraneoplastic syndromes

A

Symptom complexes triggered by cancer but not caused by direct local effects of the tumor mass.
Caused by biologic substances released due to the tumor.

(examples: crushing syndrome, hypoglycemia, hypercalcemia)

192
Q

Stages of cancer

A

1: confines to the organ of origin
2: Cancer that is locally invasive
3: cancer that has spread to regional structures such as lymph nodes
4: Cancer that has spread to distant sites, such as liver cancer which has spread to the lungs

193
Q

Manifestations of cancer

A
  • Pain *most feared
  • Fatigue
  • Cachexia
  • Anemia
  • Low platelets and blood count
  • Infection (most sig cause of death and disease)
  • GI problems
  • Hair and skin problems
194
Q

Cancer treatment options

A
  • Chemo
  • Radiation therapy
  • Surgery
195
Q

Carcinogens

A

Cancer causing substances.

  • Chemical
  • Radiation
  • Sexual practices
  • Dietary
  • Air pollution
  • Obesity
  • Electromagnetic radiation
  • Smoking

Pathophysiology (6 decks)

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