firecracker feb 12 Flashcards
erythema multiforme infectious causes
HSV
Mycoplasma pneumoniae
what is erythema multiforme
acute cutaneous hypersensitivity condition
immune mediated
target like lesions
erythema multiforme most common among
males
20-40
erythema multiforme other findings besides target lesions
malaise, mylagias
macules
plaques, vesicles
erythema multiforme lesions
red center
pale inner ring
red outer ring
meds linked to erythema multiforme
penicillins
erythema multiforme diagnosis
skin biopsy
increased lymphocytes
necrotic keratinocytes
erythema multiforme treatment
stop offending agent
corticosteroid
analgesics
how does membranous nephropathy present
edema
dyspnea
risk factors for autoimmune hepatitis
caucasian/northern europe
female
acute hep a and b infections
DR3,4
membranous nephropathy treatment
corticosteroids, cytotoxic agents, statins, ACEI
lab findings in membranous nephropathy
hyperlipidemia
hypoalbuminemia
proteinuria
What is the role of anticoagulation in the management of membranous nephropathy?
increase in coagulopathies
severe proteinura >5g/day
autoimmune hepatitis serological
Anti smooth muscle
anti live rkidney microsomal
autoimmune hepatitis treatment
prednisone
azathioprine
membranous nephropathy - immunoflourescnce
granular deposits of IgG and C3
What is found on electron microscopy in patients with membranous nephropathy?
sub-epithelial immune complex deposits
secondary membranous nephropathy
hep b, c
autoimmune - lupus
drugs - gold, penicillaine
malignancies
autoimmune hepatitis
circulating antibodies
hepatocellular inflamm
fibrosis
follicular carcinoma %
15%
what is the first and second step in working up someone with a thyroid nodule?
- ultrasound (FNA)
- radionucleotide scan if suspicious
- biopsy
What percentage of thyroid CA’s are from a medullary carcinoma?
5%
medullary carcinoma - cells
parafollicular/C cells
produce calcitonin
How does follicular thyroid CA commonly spread?
hematogenous spread –> present with mets
thyroid CA treatment
surgical removal
radioactive iodine ablation
lobectomy if less than 1cm
total thyroidectomy if greater than 1 cm
What medication is started post-operatively for patients who have undergone surgery for thyroid cancer?
levothyroxine
What is the most common sub-type of thyroid CA?
papillary
What is a common history in patients who develop papillary thyroid CA? How does it spread?
exposure to ionizing radiation
spreads thru lymphatics
prolactinoma signs & symptoms
F: galactorrhea, amenorrhea
M: loss of libido, erectile dysfxn, gyecomastia
prolactinoma =
hyperfunctioning adenoma of anterior pituitary
hormones secreted from anterior pituitary
My FLAT PiG
MSH, FSH, LH, ACTH, TSH, Prolactin, GH
prolactinoma treatment
bromocriptine or cabergoline —> dopamine agonists
dopamine inhibits prolactin release
other causes of hyperprolactinemia
pregnancy
drugs
hypothyroid/hypothalamic damage
causes of central DI
idiopathic
trauma
tumors
anorexia
diabetes insipidus
can’t retain water
water normally retained by reabsorbing it from urine
DI symptoms
polyuria, polydipsia, new onset nocturia
First Step Of workup for DI
urinarlysis
dilute urine, urine osm less than serum osm (290)
urine specific grav less than 1.06
causes of nephrogenic DI
hereidtary renal diseases
lithitum toxicity
hypokalemia
hypercalcemia
second step of DI workup
water deprivation test
no change in urine osm after water deprivation
DDAVP test
increased urine osm in central
no change in nephrogenic (renal resistance to ADH)
central DI treatment
desmopressin
nephrogenic DI treatment
underlying disorder
symptoms with hctz, indomethacin, amiloride
secondary adrenal insufficiency most commonly caused by
glucocorticoids
What infective infiltrative disorders may affect the adrenal glands?
TB
Histo
HIV
secondary adrenal insufficiency
failure of HPAxis
decreased ACTH
What pituitary neoplasms commonly suppress ACTH production?
pituitary adenoma
What are some causes of adrenal insufficiency?
- autoimmune destruction
- Tb, Hiv
- infarction of adrenal gland
- Waterhouse-Friderichsen
- DIC
what is low in adrenal insuffieiency
low morning cortisol, less than 5
What is a common cause of adrenal insufficiency in patients in a hypercoagulable state or in sepsis?
hemorrhagic adrenal infarction
What hormones are secreted by the adrenal cortex?
aldosterone
cortisol
androgen
What is “stress dosing” of steroids and when is it indicated in adrenal insufficiency?
increased doses given in cases of stress like infection or surgery
What may precipitate adrenal crisis?
stress - surgery, sepsis
look for hypotension, hyponatremia, hyperkalemia
What replacement therapy is needed in patients with primary adrenal failure in addition to prednisone?
aldosterone with fludrocortisone
What is the cosyntropin test and what would be considered an abnormal result?
differentiate 1 vs 2 ACTH def
ACTH analog
cortisol > 20 normal result
lower indicates non response, primary adrenal failure
What is a common life-threatening complication of adrenal insufficiency?
shock (adrenal crisis)
treatment for adrenal crisis
IV glucose and corticosteroids
What test is used to confirm acromegaly if IGF-1 are found to be elevated?
ORAL glucose tolerance test
What are two important metabolic complications of acromegaly?
DM
HLD
What can be used to treat persistent elevations in insulin growth factor 1 after transphenoidal resection of the growth hormone secreting pituitary adenoma?
radiation therapy
What constitutes an abnormal oral glucose tolerance test in patients with acromegaly?
GH remains greater than 2 within two hours after ingestion of 75g glucose
Patients who have been diagnosed with acromegaly based on elevated IGF-1 levels and positive glucose tolerance test require what further testing?
MRI of brain
What is the cause of obstructive sleep apnea in acromegaly?
GH causing macroglossia
acromegaly rx
somatostatin and dopamine analogues such as ocretotide and bromocriptine
CNS symptoms of acromegaly
bitemporal hemianopsia
headaches
body parts affected by acromegaly
hands, skull, jaw
cause of primary hyperPTH
single benign adenoma
hyperplasia of parathyroid glands
triad of primary hyper PTH
hypercalcemia
elevated PTH
elevated 24 hr urinary calcium
secondary hyperPTH
parathyroid glands chronically stimulated by hypocalcemia to release PTH
how does primary hyperPTH present
hypercalcemia
bones, stones, moans, groans, polyuria
causes of secondary hyperPTH
CKD
Malabsorption
Rickets
PseudohyperPTH
indications for surgical intervention in primary hyperPTH
elevated cr
hypercalcemia
kidney stones
osteoporosis
secondary hyperPTH labs
low calcium, high phosphorus
high PTH
cortisol production
hypothalamus produces CRH
pituitary produces ACTH
ZF of adrenal gland produces cortisol
what test to determine ACTH-independent vs ACTH-dependent cushing’s
plasma ACTH
what causes glucose intolerance in Cushing’s?
cortisol-stimulated gluconeogenesis
obesity-induced peripehral insulin resistance
How does a low-dose dexamethasone suppression test help diagnose Cushing’s syndrome?
normal morning cortisol following dexa should be s
Complications of cushing’s
diabetes
CVD
opportunistic infections
imaging in cushings
look for source
infections in Cushing’s syndrome
Nocardia
PCP
fungal
skin in Cushing’s
thinning
bruising
striae
hyperpigmentation
acne in Cushings?
imablance in adnrogens, estogren, GnRH
osteoporosis in Cushings?
reduced calcium absorption in intestines and kidneys
lab abnormalities in Cushings
hypokalemia
hypercalciuria
metabolic alkalosis
Cushings work up
24 urinary free cortisol test (3x)
low dose dexamethasone suppresion test
Cardiogenic Shock
decrease CO
increase SVR
increase PCWP
Hypovolemic Shock
decrease CO
increase SVR
decrease PCWP
Neurogenic Shock
decrease CO
decrease SVR
decrease PCWP
Septic Shock
increase CO
decrease SVR
decrease PCWP
Pharmacologic Agents in Cardiogenic Shock
Dopamine - vasopressor
Dobutamine - inotrope
Shock =
circulatory collapse
inadequate blood delivery resulting in hypoperfusion of tissues
How is anaphylactic shock managed?
airway maintenace
epinephrine
diphenhydramine
IV fluids
cardiogenic shock defined as
hypotension below 80-90 or 30mmhg below baseline
urine output less than 20 ml/hr
causes of cardiogenic shock
acute mi arrhythmias tension PTX cardiac tamponade massive PE
neurogenic shock =
SNS failure causing widespread peripheral vasodilation and bradycardia
anaphylactic shock =
type I hypersenisitivty rxn
etiology of neurogenic shock
CNS or spinal cord injury
cardiogenic shock =
heart fails to generate sufficient CO to perfuse tissues
causes of hypovolemic shock
hemorrhage
excess fluid loss
cause of anaphylactic shock
massive degranulation of mast cells and basophils in response to allergic rxn
management of neurogenic shock
IV fluids, vasoconstrictors to treat vasodilation
atropine for braycardia
management of hypovolemic shock
IV fluids or transfusions
surgery
dressing if due to burns
hemodynamic effects of cardiogenic shock
decrease in SV
increase in EDP and ESV
cardiogenic shock - PE findings
JVD, pulm edma
AMS
cool, clammy skin
weak thready pulse
management of shock related to MI
revascularization
use of aspirin and heparin
clinical features of neurogenic shock
warm, well perfused skin
low-normal urine output
symptoms of ARDS - focus on breath sounds
wheezing
rales
rhonchi
ARDS
acute lung inury
complement activation –> lung damage
refractory hypoxemia
PaO2/FiO2 ratio for ARDS
<200
ARDS lab findings
resp alkalosis
decrease o2
decrease co2
causes of ARDS, A
aspiration
acute pancreatitis
air or amniotic embolism
causes of ARDS, R
radiation
causes of ARDS, D
drug over dose
DIC
drowning
causes of ARDS, s
shock
sepsis
smoke inhalation
CXR for ARDS
bilateral pulmonary edema with infiltrates
BCC risk factors
p53, HPV
BCC
most common
sun exposed areas
BCC lesion
pearly, waxy apperance
telangiectases throughout lesion
BCC diagnosis
skin biopsy