Combank Assessment #2 P1 Flashcards
What is a confounding variable?
an extraneous variable that correlates positively or negatively with both the dependent and independent variables
What is Berkson bias?
A type of selection bias that is created by selecting hospitalized patients as a control group; this type of bias occurs when the control group does not represent the population being studied
What is the most common form of congenital hydroxylase deficiency?
21-hydroxylase deficiency
How does 21-hydroxylase deficiency affect the secretory products of the adrenal gland?
decreased glucocorticoids and minteralcorticoids; increased sex hormones
The reduction of minteralcorticoids caused by 21-hydroxylase deficiency causes the activation of what system?
renin-angiotensin system is activated due to hypotension from salt wasting; thus, angiotensin II levels are elevated
Name the murmur: crescendo-decrescendo, systolic ejection murmur, heard best at left upper sternal border 2nd intercostal space; increases in intensity with inspiration
pulmonic stenosis
Name the murmur: high-pitched holosystolic murmur, blowing quality, best heard over apex, radiates to axilla
mitral valve regurgitation
Hypertrophic obstructive cardiopmyopathy results in what type of murmur?
a systolic ejection murmur that has a crescendo-decrescendo quality; best heard along left sternal border
how does the systolic ejection murmur caused by hypertrophic obstructive cardiomyopathy change with preload and afterload?
murmur diminishes with increased preload (squatting or lay supine); murmur diminishes with increased afterload (hand grip)
How does preload affect the murmur caused by aortic stenosis?
murmur increases with increased preload (squatting); decreases with decreased preload (vaslsalva, handgrip)
What is a common cause of aortic stenosis in patients in the 6th decade of life?
congenital biscupid valve
right sided heart murmurs increase with?
inspiration
left sided heart murmurs increase with?
expiration
What is the MOA of sildenafil?
inhibit phosphodiesterase 5, causing increased cGMP, smooth muscle relaxation in the corpus cavernosum, increased blood flow and thus increased penile erection
Sildenafil also weakly inhibits PDE-6, what AE can this cause?
b/c it is required for the transformation of light into electrical signals inhibition of PDE-6 can cause cyanopsia or blue vision
What is the DOC for a UTI during pregnancy?
Amoxicillin
What class of anti-microbials does doxycycline belong in?
Tetracyclines
Why should fluoroquinolones and tetracyclines be avoided in pregnancy?
fluoroquinolones damage cartilage in growing fetus; tetracyclines damages growing bones
Osler-Weber-Rendu syndrome is also known as?
hereditary hemorrhagic telangiectasia
What is Osler-Weber-Rendu syndrome?
AD d/o; presents with recurrent, severe epitaxis, multiple telangiectasias, and AV malformations
What is Sturge Weber syndrome?
congenital d/o associated with port-wine stains, usually in V1 ophthalmic distribution and also ipsilateral arteriovenous malformations in the meninges
What characterizes neurofibromatosis type I d/o?
AD neurocutaneous d/o; presents with cafe-au-lait spots, lische nodules, neurofibromas, optic gliomas, and pheochromocytomas
What characterizes tuberous sclerosis?
AD d/o; may present with mental retardation and seizures in infancy, along with angiofibromas of the face, ash leaf lesions, hemartomatous lesions, and cardiac rhabdomyomas
In what way can squamous cell carcinoma cause hypercalcemia?
Squamous cell carcinomas of the lung can cause a paraneoplastic syndrome in which the tumor secretes PTH-related peptides; this increases calcium and decreases PTH secretion from the parathyroid glands via negative feedback
Hypertensive strokes tend to form what type of infarcts in the basal ganglia? what is the most commonly affected arterial supply?
lacunar infarcts; lenticulostriate branches of the middle cerebral artery
The ureters lie directly on what muscle as they course from the kidney on their way to the bladder?
psoas muscles
What is the major blood supply to the occipital lobe containing the primary visual cortex?
posterior cerebral artery
Occlusion of the PCA causes?
contralateral hemianopsia with macular sparing
Occlusions of what artery will cause contralateral hemianopsia without macular sparing as it results in ischemia to the optic radiations?
MCA
A LBBB can present with what type of splitting?
Paradoxically split S2 – on inspiration, P2 closes later and moves closer to A2, thereby paradoxically eliminating the split
Hyperglycemia is a common cause of what type of electrolyte imbalance? how does it occur?
hypertonic hyponatremia; since glucose is osmotically active, it acts as a concentrated solute in the extracellular compartment and draws water from the intracellular compartment, this causes a drop in sodium
Diuretics, esp. thiazide diuretics is one of the principle causes of what type of electrolyte imbalance? how does it occur?
hypovolemic hypotonic hyponatremia; thiazide diuretics inhibit Na+ reabsorption in the DCT by blocking a sodium-chloride symporter – this leads to an increased excretion of Na+ and water
T/F cases of CMV are not required to be reported to CDC on a national level
T
Diseases that are reportable to the CDC on a national level
AIDS, TB, meningococcal meningitis, hepatitis A-C, gonorrhea, tetanus, lyme disease, syphilis, rabies, measles, salmonella, mumps, shigella, rubella, polio
Signs of hypocalcemia
tingling in lips, abdominal pain, Trousseau sign (occlussion of brachial artery with BP cuff causes carpal spasm), Chvostek sign (tapping of facial nerve causes contraction of facial muscles)
Function of PTH
increase serum calcium and decrease serum phosphate levels
What is the presentation of pseudohypoparathyroidism?
body tissues do not respond to PTH; serum calcium stays low and serum phosphate is high; low serum calcium leads to an elevated PTH level
What is trigger finger aka flexor tenosynovitis?
inflammation of the flexor tendon sheath of the finger; tendon may catch or lock at the metacarpophalangeal joint, causing the finger to lock in flexion
What test is used to dx de Quervain’s syndrome?
Finkelstein’s test
What is De Quervain’s tenosynovitis?
a tenosynovitis of the abductor pollicis longus and extensor pollicis brevis tendons that located at the styolid process of the radius
What are the symptoms of De Quervain’s tenosynovitis?
radial sided wrist and thumb pain, tenderness, and swelling, which may cause difficulty with grip
What causes herpetic whitlow and how does it present?
herpes simplex virus infection causing erythematous papules of the distal finger; it is a self-limiting condition
What is jersey finger?
rupture of the flexor digitorum profundus tendon at its point of attachment to the distal phalanx; injury often occurs in football when the tip of the finger is hyperextended at the distal interphalangeal joint
What is the cause of mallet finger?
results from a traumatic blow to the distal phalanx causing hyperflexion of the extensor digitorum tendon; patient is unable to actively exten the distal interphalangeal joint
What are first line agents for patients suffering from dysmenorrhea?
NSAIDs
What class of drugs is Losartan in? what is it used for?
angiotensin II receptor blocker; used to treat hypertension; blocks the vasoconstrictor and aldosterone secreting effects of angiotensin II
ARBs and ACE inhibitors have similar effects but what is one significant difference?
ARBs (“–sartans”) do not increase bradykinin so there is no resultant cough or angiodema
What is a common contraindication of losartan?
it is contraindicated in pregnancy because it may cause damage to the fetal kidney
What are the classic signs of carcinoid syndrome?
flushing, diarrhea, bronchospasm due to elevated 5-hydroxyindoleacetic acid (5-HIAA), serotonin and other vasoactive substances in systemic circulation
Carcinoid tumor does not necessarily lead to carcinoid syndrome, why?
If tumor is limited to the GI tract 5-HT undergoes first pass metabolism in the liver; if the tumor exists or metastasizes (usually to the liver) outside the GI system then carcinoid syndrome occurs
What is the most common tumor of the appendix?
carcinoid tumor
An increase in serum pH causes what change between calcium and albumin?
increases the binding of calcium to albumin
What protein produced in the liver is the body’s predominant serum-binding protein responsible for transporting various substances, such as bilirubin, fatty acids, metals, ions, hormones and exogenous drugs?
Albumin!
Calcium exists in two forms, protein bound and free ionized form; what form does Calcium predominantly exist in?
majority of circulating calcium is bound to albumin in its inactive form; thus total calcium fluctuates with albumin concentration
The physiologically active free ionized form of calcium is regulated by what?
PTH; this form is independent of albumin levels
Brain natriuretic peptide (BNP) is secreted fro the ventricles in response to?
stretch
BNP has similar effects as ANP in that they both are …
diuretics, natriuretics and anti-hypertensives
Constriction of what will decrease renal plasma flow and increase GFR?
efferent arteriole
What is the MOA of cilostazol and what is it used for?
phosphodiesterase III inhibitor – increases cAMP in platelets to inhibit platelet aggregation, results in vasodilation; used for angina prophylaxis, intermittent claudication and coronary vasodilation
Naproxen is in what category of drug?
NSAID
What is placenta accreta?
placenta adheres to the myometrium of the uterus
Failure to deliver the placenta within 30 minutes of birth should lead to suspect what condition?
placenta accreta
What is Asherman’s syndrome?
a condition characterized by adhesions and/or fibrosis of the endometrium most often associated with dilation and curettage of the intrauterine cavity.
What is placenta previa?
occurs when the placenta is low lying and covers part of or all of the cervical os
What is placenta increta?
placental tissue invasion all the way through the myometrium; more severe than placenta accreta
What is placenta percreta?
placenta tissue invasion through the entire uterine wall
What is placenta abruptio?
placenta detaches prematurely from the uterine wall
What is the causative agent for Kaposi sarcoma? what condition is it associated with? how does it present?
caused by HHV-8; it is an AIDs-associated infection; manifests as painless red-violet lesions caused by endothelial proliferation
What is the blood supply to the lateral medulla?
posterior inferior cerebellar artery
What is Wallenberg’s syndrome?
an infarction of the lateral medulla of the brainstem; acute onset of vertigo and disequilibrium; PE reveals nystagmus, ipsilateral Horner’s syndrome, ipsilateral limb ataxia, sensory loss of pain and temperature on the ipsilateral face and contralateral trunk; hoarseness and dysphagia often present
What is subclavian steal syndrome?
flow reversal in the vertebral artery ipsilateral to the occlusion; subclavian artery stenosis proximal to the origin of the vertebral artery results in lower pressure in the distal subclavian artery – as a result blood flows from the contralateral vertebral artery to the basilar artery and then flows in a retrograde direction down the ipsilateral vertebral artery and away from the brainstem
What is amaurosis fugax?
acute and painless onset of monocular visual loss in the background of atherosclerosis; results in episodes of transient monocular blindness due to retinal ischemia
visual loss that is described as a dark curtain falling down over the eyes and that progresses toward the center of vision is most likely?
Amaurosis fugax
Reinke’s crystals are found in what type of testicular non-germ cell tumor?
Leydig cell tumors
Where are leydig cells found and what do they produce?
in the interstitium of the testis adjacent to the seminiferous tubules in the testicle; they produce testosterone in the presence of LH
How does choriocarcinoma, a testicular germ cell tumor present?
associated with the development of gynecomastia due to the secretion of beta hCG, which has similar properties as LH; patients also present with precocious puberty, gynecomastia, impotence or loss of libido
What is diffuse large B-cell lymphoma and what age group is most commonly affected?
a non-hodgkin lymphoma; occurs in patients 70-80 y.o.; presents with systemic symptoms of fever, night sweats, weight loss, fatigue; typically present with rapidly enlarging mass in the neck
What are sertoli cell tumors? most commonly affects what population?
testicular non-germ cell tumor; derived from cells located within the seminiferous tubules; can occur in both children and middle aged adults