uWorld 18 Flashcards
the vertebral venous plexus communicates with many things what connections allow for spread of prostate, breast, and lung cancers to the thoracic spine
prostate- prostatic venous plexus
lung and breast- Azygous Vein
what are lumacaftor and ivacaftor
CFTR-modulating medications that can potentially help pts with CF by restoring CFTR proteins to the membrane and also by enhancing protein function (chloride transport) at the membrane, respectively
has been shown to improve predicted FEV and decrease rates of pulmonary exacerbations
what parts of the pleura does the phrenic nerve innervate
DIAPHRAGMATIC and MEDIASTINAL PELURA
costal and cervical are innervated by intercostal nerves and are felt more locally
as the airways move distally what is the last thing to disappear as the epithelium changes along the respiratory tube
cilia (not found in alveolar ducts or alveoli themselves but everywhere else)
what part of the G-protein coupled receptor has 20 amino acids consisting mainly of valine, alanine, and isoleusine
TRANSMEMBRANE DOMAIN (anchors to the cell membrane) has many non polar, hydrophobic amino acids (Ala, Val, Leu, Ile, Phe, Trp, Met, Pro, Gly arranged in ALPHA HELIX and project hydrophobic R groups outward, ANCHORING the transmembrane region of the protein to the hydrophobic core of the PHOSPHOLIPID BILAYER
hormone sensitive lipase is activated and inhibited by what
activated by stress hormones (catecholamines, glucagon, ACTH) via Gs receptors on adipocytes inc cAMP and PLA and PKA phosphorylating and activating HSL- stimulating lipolysis
inhibited by INSULIN
what does hormone sensitive lipase do
enzyme found in adipose tissue that catalyzes the mobilization of stood TBs into FREE FATTY ACIDS (FFAs) and GLYCEROL
the FFAs can be oxidized by the liver to acetyl-coA, which can be further metabolized into KETONE BODIES or shunted into TCA to generate energy for gluconeoenesis
glycerol used primarily as carbon source for GLUCONEOGENESIS
what does glycogen phosphorylase do
rate-limiting step of GLYCOGENOLYSIS- process that frees glucose-1-phosphate from stored glycogen chains
increases blood glucose levels during first several hours of fasting (no effect on FA oxidation)
what does mitochondria HMG-CoA Synthase do
plays a role in keynote production
what does testosterone influence the development of
internal male genetalia
spermatogenesis
male sexual differentiation at poverty (muscle mass, libido)
what does DHT influence the development of
external male genitalia
growth of prostate
male-pattern hair growth
amplifies the effects of testosterone due to high affinity for testosterone receptor
prenatal cocaine abuse increases the risk of what
preeclampsia
spontaneous abortion
fetal demise
placental abruption
what is gestation diabetes associated with
mascrosomia caudal regression syndrome hypoglycemia hypocalcemia hypertrophic cardiomyopathy
what happens if leydig cells are functional but Sertoli cells are not in a fetus that is 46XY w/ testes
both female and male internal genitalia
male external genitalia
w/o MIF from sertoli cells the mullerian ducts will form female internal genitalia (fallopian tubes, uterus)
what is testes determining factor (TDF) and where is it found
responsible for gonadal differentiation into testes
found on STY gene no the Y chromosome
what tumor has characteristic waxing and waning of lymph nodes
FOLLICULAR t(14,18) blc-2overexpression
ALL is the most common leukemia in children, how does it present
lymphadenopathy hepatosplenomegaly fever bleeding bone pain
who does diffuse b-cell lymphoma typically present
rapidly enlarging nodal (neck, abdomen, mediastinum) or extranodal symptomatic mass
Waldeyer’s ring (oropharyngeal lymphoid tissue) and GI tract are often involved
B-symtposm (fever, weight loss, drenching night sweats) can also be seen
how does hairy cell leukemia present
splenomegaly and pancytopenia in older men
tartrate-resistant acid phosphatase (TRAP) positive cells with hairlike cytoplasmic projections
how does mycosis fungicides present
cutaneous T-cel lyphonoma
proliferating CD4+ infiltrate dermis and epidermis, forming POUTRIER MICROABCESSES
manifests with PLAQUES (often on trunk or buttocks)
that may be confused with eczema or psoriasis
granulized erythema and scaling of the skin (erythroderma) may result
what nerve is found in the lateral compartment of the leg
superficial peroneal nere
blood drained by peroneal veins
ACS can produce- loss of sensation in the lower leg and dorsal of the food as well as foot drop
what nerve is found in the deep posterior compartment of the leg
tibial nerve
posterior tibial nerve and veins
peritoneal artery and veins
ACS of this compartment- decreased sensation of plantar surface, decreased toe flexion, and pain with passive toe expression
what nerve is found in the anterior compartment of the leg
deep peroneal (fibular) nerve anterior tibial artery and veins
most common site of compartment syndrome- foot extensors fucked (foot drop, decreased sensation b/w 1st and 2nd toes)
what is the course of the great (long) saphenous vein
dorsum of food and runs along medial leg and anterior thigh b4 merging with he common femoral vein in the femoral triangle
what are two complications of hereditary spherocytosis (AD)
PIGMENTED GALLSTONES (any hemolytic anemia has this) aplastic crisis from parvovirus B19 infection
pigmented gallstones are a complication of any what
hemolytic anemia
increased bilirubin from lysed RBCs precipitates as calcium bilirubinate, forming pigmented stones in the gallbladder
femoral avascular necrosis is seen in what RBC issue
SICKLE CELL
in a patient with both tonic-clonic seizure and absence seizures, what medication is the drug of choice
VALPROATE (treats both absence seizures and generalized tonic-clonic)
ethosuximide only treats absence seizures but will not be effective against generalized tonic-clonic
carbamazepine is the drug of choice for what type of seizures
complex (loss of consciousness) partial seizures but is also effective in generalized tonic-clonic
feared ADR of agranulocytosis or aplastic anemia
what are the classic 3D’s of C botulism
DIPLOPIA
DYSPHAGIA
DYSTONIA
develop within 12-36 hours of consumption
what is the toxin found in pufferfish and what does it do
tetrodotoxin leads to inhibition of sodium influx into nerve endings manifests as: weakness paresthesias (face, extremities) loss f reflexes sometimes severe hypotension patients commonly remain conscious although paralyzed
what is seen on peripheral blood smear of P falciparum
multiple small rings- TROPHOZOITES
banns-shaped gametocytes