final exam Flashcards
different pancreatic cell types: alpha cell
stimulate release of glucagon and glycogen stores and promote gluconeogenesis
different pancreatic cell types: beta cell
stimulate release of insulin and lower blood glucose level
different pancreatic cell types: delta cell
inhibit glucagon and insulin secretion
acute pancreatitis
pathogenesis
causes
inflammation and hemorrhage of pancreas (premature activation of trypsin –> pancreatic enzymes autodigest pancreatic parenchyma
alcohol, gallstones, trauma
pancreatic pseudocysts (liquefactive necrosis), pancreatic abscess (E. coli)
chronic pancreatitis
pathogenesis
causes
symptoms
signs
risks
fibrosis of pancreatic parenchyma secondary to recurrent acute pancreatitis
alcohol, CF, idiopathic
epigastric pain radiating to back, pancreatic insufficiency
dystrophic calcification on xray (“chain of lakes” pattern)
may inc. risk of pancreatic carcinoma
T1D
pathogenesis
classification
risks
symptoms
treatment
insulin deficiency (hyperglycemia) due to autoimmune destruction of beta cells by T lymphocytes, inflammation of islets
HLA-DR3 and DR4, autoantibodies against insulin
untreated –> ketosis and diabetic ketoacidosis
weight loss, polydipsia, polyphagia, weakness
need lifelong insulin
T2D
pathogenesis
side effects
diagnosis (levels)
non-insulin dependent, insulin resistance and inadequate insulin secretion, resistance linked with inc. levels of free fatty acids and pro-inflammatory cytokines
lipotoxicity (toxic effects of excess free fatty acids), unregulated secretion on cytokines
amyloid deposits
dx: (normal 70-120 ug/dL) random > 200, fasting > 126, gestational > 200
T1D emergency: diabetic ketoacidosis
pathogenesis
symptoms
treatment
bodys change to fat metabolism and build up of ketones (acidosis)
hyperglycemia (>300), hypercalcemia, Keussmaul respirations, dehydration, fruity breath
tx with fluids, insulin, electrolytes
T2D emergency: hyperglycemic hyperosmolar non-ketotic coma (HHNC)
pathogenesis
sign
treatment
(>500 mg/dL) —> diuresis with hypotension and coma
absent ketones due to dec. insulin, hyperglycemia
tx with fluids and insulin
hypoglycemia: insulin shock
levels
treatment
< 60 mg/dL, medical emergency
tx with oral glucose (if awake and able, 15-30 gram or food/drink, slower activation), IV glucose (dextrose 50% D50 for adult, D25 for children, D10 for infants)
pituitary tumors
sizing
pathogenesis
macro > 1 cm or micro < 1 cm adenoma
lesion causing compression of optic chiasm or basal portion of brain
pituitary tumors: prolactinoma
pathogenesis, male/female
commonality
treatment
inc. prolactin, female: galactorrhoea and amenorrhea, male: dec libido and headache
most common type of pituitary adenoma
tx with dopamine antagonists or sx
pituitary tumors: GH cell adenoma
levels
symptoms
treatment
inc. GH
gigantism if before epiphyseal closure (F: 12-16, M: 14-19)
acromegaly if after epiphyseal closure (jaw, hands, feet, face)
treat with GH receptor agonist
pituitary tumors: ACTH
causes…
Cushing’s Sydnrome
hypopituitarism
definition
cause
deficient secretion of only one or a few pituitary hormones
caused by tumor
panhypopituitarism
definition
total failure of pituitary function
Sheehan syndrome
definition
pathogenesis
cause
cause of symptoms
pregnancy related infarct of pituitary gland
2x in size but blood supply does not inc.
infarct caused by blood loss and shock during childbirth
symptoms due to loss of gonadatropins, then TSH and ACTH
empty sella syndrome
pathogenesis
disturbance
thin, flat pit. gland secondary to congenital defect or absented diaphragma sella, CSF pressure into sella
minor endocrine disturbance
diseases of posterior pituitary: syndrome of inappropriate ADH (SIADH) secretion
definition
symptom
treatment
ectopic production of ADH by various tumor
water retention with hyponatremia
treat with water restriction
diseases of posterior pituitary: ADH deficiency
results in
symptoms
treatment
results in diabetes insipidus
dehydration, insatiable thirst
treat with ADH analog
Marfan syndrome
connective tissue
thyroid hormone: hypo-
levels
symptoms
dec free T4 inc TSH
cretinism (iodine deficiency), mental retardation, growth impairment, large tongue, big abdomen
thyroid hormone: hypo- … myxedema
who does it affect
symptoms
women
weight gain (dec BMR), lower voice, constipation, physical/mental slowness, puffy, dry skin, brittle hair, hair loss, inc. relaxation stage of deep tendon reflexes
thyroid hormone: hypo- … hashimoto’s
classification
main symptom
HLA-DR5, anti-thyroglobulin and anti-microsomal antibodies
chronic inflammation
thyroid hormone: hyper- … grave’s disease
pathogenesis
who does it affect, classification
symptom
treatment
autoantibody (IgG) that stimulates TSH receptor (type II hypersensitivity); TSI reacts with TSH receptors = glandular hyperplasia and enlargement, stimulates thyroid hormones production
women, inc. in HLA-DR3
exophthalmos
treat with anti-thyroid drugs, thyroidectomy, radioactive iodine
thyroid hormone: hyper- … plummer’s disease
less severe symptoms than graves and never develop exophthalmos
thyroid hormone: goiter
thyroid enlargement
thyroid hormone: goiter - simple (nontoxic)
without thyroid hormone dysfunction
thyroid hormone: goiter - toxic
hyperthyroidism
thyroid hormone: goiter - endemic
high frequency in iodine-deficient geographic area
thyroid hormone: goiter - sporadic
non-iodine deficient area
thyroid hormone: goiter - nodular
irregular thyroid enlargement = nodule formation
thyroid hormone: goiter - nodular colloid
late stage simple goiter, looks nodular
thyroid cancer: papillary carcinoma
definition
malignancy
incidence
survival
papillae lined by cuboidal cells with clear nuclei
low grade malignancy
incidence 70%
survival 85% @ 20 years
thyroid cancer: follicular carcinoma
cells affected
who is affected
incidence
thyroid follicular cells
women, aggressive
incidence 20%
thyroid cancer: medullary carcinoma
definition
survival
incidence
amyloid deposits in tumor and inc. calcification
aggressive
survival 50% @ 5 years
incidence 5%
thyroid cancer: anaplastic carcinoma
malignancy
survival
incidence
highly malignant, rapid growth
most patients die within 1 year
incidence 1%
parathyroid diseases: hyper-
Ca2+ inc.
parathyroid diseases: hypo-
levels
causes
symptoms
treatment
Ca2+ dec.
accidental surgical excision, DiGeorge
hypocalcemia, neuromuscular excitability and tetany
treat with high Ca2+ diet and vitamin D supplement
parathyroid diseases: primary hyperparathyroidism
pathogenesis
treatment
associated disease
excess PTH, parathyroid adenoma (> 80% causes)
treat with sx
von Recklinghausen disease
parathyroid diseases: secondary hyperparathyroidism
definition
levels
compensatory parathyroid hyperplasia in response to hypocalcemia due to chronic renal disease
inc. PTH
parathyroid diseases: pseudohypo-
levels
pathogenesis
dec. Ca2+, inc. phosphate, inc. PTH
multihormone resistance (PTH, LSH, LH, FSH)
adrenal cortex: hyper- … Cushing’s
signs
causes
dx
symptoms
treatment
inc. glucocorticoids
exogenous corticosteroid medication, hyperproduction of ACTH, adrenal cortical adenoma or adrenal carcinoma, ectopic production of ACTH by non-pit. carcinomas
dx with 24 hour inc. cortisol (blood or urine)
moon face, buffalo hump
treat with cortisol inhibition and sx
adrenal cortex: hyper- … Conn’s
inc. aldosterone, secreting adenoma
adrenal cortex: hyper- … congenital adrenal hyperplasia
definition
treatment
absent sex steroid with hyperplasia of both adrenal glands
treat with HRT
adrenal cortex: hypo - … Addison’s
cause
sign
treatment
due to idiopathic adrenal atrophy, autoimmune, TB
hyperpigmentation (inc. ACTH)
treat with corticosteroids
tumors of the adrenal medulla: neuroblastoma
definition
cell signs
treatment
highly malignant catecholamine-producing tumor in early childhood
small round blue cells with rosette like structures
rarely causes hypertension
treat with sx and chemo
TORCH
definition
fetal symptoms
stands for
intrauterine infection from mom to fetus
microcephaly, CNS calcification, rash, hepatosplenomegaly, thrombocytopenia
Toxoplasma
Other
Rubella
Cytomegalo virus
Herpes simplex virus 1&2
neural tube defects
caused by
maternal folic acid deficiency
neural tube defects: spina bifida
failure to lose posterior vertebral arches
neural tube defects: spina bifida occulta
no apparent abnormalities, patch of hair over vertebral defect
neural tube defects: spina bifida cystica
herniation of meninges through a defect
meningocele: meninges only
meningomyelocele: protrusion of meninges and spinal cord
Tay-Sachs
who does it affect
symptoms
pathogenesis
Jewish kids
fixed gaze, distinctive cherry red spot
hexosaminidase A is a lysosomal enzyme involved in breakdown of gangliosides (type of phospholipid), accumulation of GM2 gangliosides
anencephaly
absence of fetal brain tissue and overlying skull, frog like looking
Down’s syndrome
cause
signs
dx
trisomy 21
gaping mouth, large tongue, heart and GI defects
dx with inc. alpha protein or inc. estriol in blood or amniotic fluid of mother
Arnold-Chiari malformation
definition
results in
causes…
downward displacement of cerebellar tonsils and medulla through foramen magnum
results in pressure atrophy of displaced brain tissue
causes hydrocephalus due to CSF outflow obstruction
dandy-walker malformation
pathogenesis
dx
prevention
failed development of cerebellar vermis, massively dilated 4th ventricle with absent cerebellum and hydrocephalus
dx with ultrasound or inc. acetylcholine esterase
prevent with supplementary folic acid over 1,000 ug/day
hydrocephalus
pathogenesis
inc. volume of CSF due to obstruction of CSF circulation by congenital malformation, inflammation, tumors, or dec. cerebral mass (ex: Alzheimer’s)
chronic traumatic encephalopathy (CTE)
cause
pathogenesis
when does it happen
symptoms
history of repeated TBI
progressive degeneration of brain tissue, buildup of protein tau
months to years after TBI
memory loss, confusion, impaired judgement, impulse control issues, aggression, depression, progressive dementia
bullet wounds to the head: high velocity vs low velocity
high: immediate inc. supratentorial pressure and clean thru to death, like a sniper
low: inc. pressure at gradual rate, hemorrhagic, edema, can do more internal damage
hemorrhages: epidural hematoma
flow
definition
urgency
arterial
laceration of branches of middle meningeal artery, skull fx
immediate emergency, lens shape lesion on CT
hemorrhages: subdural hematoma
flow
definition
when does it happen
venous
collection of blood under dura, crescent shape lesion on CT, inc. ICP
hours, days, weeks later
hemorrhages: subarachnoid hemorrhage
definition
cause
mortality
berry aneurysm of circle of Willis
by traumatic brain contusion or rupture of berry aneurysm
high mortality, blood in CSF
Cushing’s reflex for ICP
INC BP (dec with shock)
dec pulse
dec respiration
dec consciousness
trauma of CNS: coup
impact site = injury site
trauma of CNS: contrecoup
injury site opposite of impact site, head stops and brain collides into skull
diffuse axonal injury (DAI)
result from TBI, neuro deficit and coma, researched by military
coma scoring
13 or lower: mild BI
9-12: moderate BI
8 or lower: severe BI
spinal injury: anterior cord syndrome
definition
bony fragments put pressure on anterior cord = loss of motor movements and pain below injury
spinal injury: central cord syndrome
definition
hyperextension of c-spine = loss of motor movements in UE and disruption
spinal injury: brown-sequard syndrome
definition
cause
injury to one side of spinal cord = sensory and motor loss on same side, pain and temperature loss on the other side
penetrating injury is cause
stroke
definition
types
causes
cerebrovascular compromise
ischemia (85%), hemorrhage (15%)
cerebral thrombosis, cerebral embolus, cerebral hemorrhage, carotid artery ateriosclerosis
stroke: transient ischemic attack
definition
duration/damage
indicative of…
temporary disturbance of cerebral circulation, damage is not permanent, indicative of carotid artery disease, symptoms resolve in minutes
SHORT ANSWER
ISCHEMIC OR OCCLUSIVE STROKE PATHOGENESIS
Embolic Stroke
embolus from another location
caused by atrial fibrillation
clots form in heart and go to the brain
SHORT ANSWER
ISCHEMIC OR OCCLUSIVE STROKE PATHOGENESIS
Thrombolytic stroke
thrombus developed at clogged part of vessel
happens at nighttime
SHORT ANSWER
ISCHEMIC OR OCCLUSIVE STROKE PATHOGENESIS
Lacunar (cryptogenic) stroke
blockage of cerebral artery
brain cells in a small area are damaged or killed by lack of O2, causes significant disability
hypertension and plaque in carotid arteries are contributing factors
stroke: hemorrhagic stroke
definition
location
bleeding interferes with brain function
can be within brain or between brain and skull
stroke: hemorrhagic stroke - intracerebral bleeding
causes
due to berry aneurysm or hypertension
stroke: hemorrhagic stroke - subarachnoid hemorrhage
pathogenesis
cause
damaged blood vessels = blood accumulates at brain surface, blood into CSF, inc. pressure = immediate headache, artery spasms
leaking sacular aneurysm or arteriovenous malformation (AVM)
stroke symptoms
facial drooping, difficulty speaking, headache, weakness/paralysis on one side, numbness, incontinence
HYPOGLYCEMIC PATIENTS MIMIC STROKE SYMPTOMS
stroke symptoms: FAST
Face
Arm
Speech
Time
stroke dx
CT
MIR
depends on location and size
stroke treatment: ischemic stroke
TPA within 3 hours, try not to damage penumbra
within 6-7 hours = endovascular thrombolectomy
stroke treatment: hemorrhagic stroke
catheter with coil endovascular removal
meningitis
inflammation of leptomeninges (pia and arachnoid mater)
pyogenic meningitis
causes
signs
tx
group B strep, e. coli, listeria monocytogenes (infant), neisseria meningitis (children, teenager), strep pneumoniae (children, teenagers) , H. influenza (non vaxxed infants)
purulent exudate, dilated meningeal vessels, cloudy CSF with neutrophils, inc. protein and dec. CSF glucose
tx with antibiotic and steroid
viral meningitis
causes
sign
tx
HBV, coxsackievirus (children, oral-fecal), echovirus; low incidence
lymphocytes with normal CSF glucose
tx with antiviral
fungal meningitis
sign
tx
rare
lymphocytes with dec. CSF glucose
tx with antifungal and steroid
meningitis symptoms
triad
bacterial complications
triad: headache, neck stiffness, fever
photophobia, vomiting, altered mental status,
complications with bacterial: death, herniation, hydrocephalus, seizures, hearing loss
Crutzfeld-Jacob disease (mad cow)
cause
transmission
sign
treat
caused by small protein “bad prion” (PrPsc)
transmission by exposure to prion-containing animal tissue (usually brain)
find spongiform encephalopathy with small cysts in CNS gray matter
inactivate with 1M NaOH for 1 hour
SHORT ANSWER: pathogenesis of MS
- demyelination of white matter of CNS, shows gray appearing plaque in white matter; helper CD4+ and cytotoxic CD8+ T lymphocytes and macrophages infiltrate plaques
- women 2x as likely as men
- HLA-DR2
- depletion of myelin-producing oligodendrocytes
multiple sclerosis
definition
Charcot’s triad
symptoms
dx
relapsing neuro deficits with periods of remission
Charcot’s triad: nystagmus, scanning speech, tremor
loss of sensitization of touch, muscle weakness, dysfunction of bowel, bladder, sexual (autonomic NS)
dx: MRI reveals plaque, spinal tap shows inc. lymphocytes, immunoglobulin, and myelin basic protein
SHORT ANSWER: pathogenesis of Alzheimer’s disease
- brain appears atrophic, narrowing of gyri, widening of sulci
- neuritic plaque: cluster AB amyloid derived from amyloid precursor protein (APP) coded on chromosome 21. APP undergoes alpha and beta cleavage, resulting in AB amyloid, which may deposit around vessels, inc. risk of hemorrhage
- neurofibrillary tangles: Tau proteins (defective)
Alzheimer’s disease
definition
physiological sign
risk factors
dx
tx
most important cause of dementia
atrophy of cortical parts of frontal and temporal lobes
70+ years old, become mute and bedridden, infection is common cause of death
ApoE4 inc. risk, ApoE2 dec. risk
dx with PET, MRI
tx with acetylcholinerase inhibitors to slow progression, no cure
Pick disease
what does it cause
who does it affect
signs
tx
cause dementia
affect more women
cortical atrophy and accumulation of Pick bodies
tx behavioral and language symptoms, no cure
Parkinson’s disease
causes
symptoms
tx
tremor at rest that goes away with movement, rigidity, ankinesia/bradykinesia
tx with LDOPA, dopamine agonist, deep brain stimulation
causes: idiopathic, trauma, dopamine antagonists, contaminated street drugs