Incorrects Uworld Flashcards
Hematuria 3 days after a flu like illness (frequently)- Condition?
IgA Nephropathy (most common cause glomerulonephritis)
Histological finding of Abetapoproteinemia?
foam/clear cytoplasm at tip of jejunal villi
Cause and presentation of Pityriasis versicolor?
Hypopigment/hyperpigmented or erythematus macules/patches on upper body. Caused by Malasseiza species.
Number one lung cancer in nonsmokers and women
Adenocarcinoma
What happens to complement in SLE?
Goes down (eg c3 and c4) because it is being used
What causes triglyceride accumulation in hepatitic steatosis?
Decreased free fatty acid oxidation
What has antibodies to PLA2R?
Membranous nephropathy (these are found in podocytes)
Erythrocyte apperance in gray hepatiziation vs red hepatidization of lobar pneumonia?
Gray; broken down RBC, Red; alive rbc
What makes elastase in the lung? What can too much activity of it cause?
macrophages/neutrophils; emphysema (Too much protease activity aka elastase)
Painful thyroid; dx and histologic apperance?
Subacute granulomatus thyroiditis; mixed, cellular infiltration with occasional multinucleated giant cells
What can cause IgE independent mast cell degranulation (and anaphylaxis)?
Opoiods (including morphine), radiocontrast, some abx (eg vancomycin)
What do small cell lung cancers stain for?
Neuroendocrine markers (Neural Cell Adhesion molecule NCAM aka CD56, enolase, chromogranin, synaptophysin), also sometimes neurofilaments
Inheritance pattern of G6PD?
X linked recessive
Two vasculitises with Granulomas?
Giant Cell, Takaysu
Giant kidneys on CT in old man; method of inheritance?
autosomal dominant (polycystic kidney disease)
Most common complication of levothyroxine (or at least why you want to reduce dose if they are doing well)
Afib
Antibodies in Polymyositis?
Anti-jo (anti t-rna synthase)
Symptoms of Myotonic Dystrophy and inheritance?
autosomal dominant-increased trinucleotide repeats on myotonia-protein kinase gene. Sustained muscle contraction, weakness, atrophy, CATARACTS, BALDING, GONADAL ATROPHY
Sympathetic receptor that: increases insulin? Decreases insuilin?
Increases: Beta 2
decrease: alpha 2
How does ARDS work in sepsis?
Cytokines frmo infection-> activate pulm epithelium-> Cap damage/leakage-> Excess fluid in alveolar space.
Tx for psoriasis?
Calcipotrene (or other topical vit D analogs calcitrol, talcictol): bind to Vit D, less keratinocyte prolif, more keratinocyte differentiate
What enzyme inactivates the drug 6MP? What activates it?
Xanthine Oxidase. Activated by HGPRT
PAINFUL rash on face, groin, extremeties plus type 1 DM- what is diagnosis?
Glucagonoma (with necrolytic migratory erythema)
Cytogenic defect of APML? What gene is active?
t(15;17): activate retinoic acid receptor, PML/RARA fusion gene inhibits differention of myoblasts-> APML
Potential reaction to transmural necrosis/necrotic segment of myocardium 2-4 days after MI? Tx?
Pericardial inflammation to overlying necrotic segment of myocardium (Periciditis). Tx with aspirin therapy (leaves in 1-3 days)
Tyrosine kinase active in some breast cancer- what is it? Tx?
HER2 oncogene (increases prolif, less apop). Tx with Trastuzumab (antibody against HER2)
Why do you give people with SCID irridated RBCS in transfusion?
to prevent a reaction down the road (of the donor T cells against the host)
Someone is severely hypoglycemic; what do you give them?
glucagon
What symptoms do you get in a pineal gland tumor/Parinaud syndrome?
upward gaze palsy, absent pupillary light reflex, impaired convergence
What is McArdle Disease a defect in? (process and enzyme)
Glycogenolysis, Glycogen Phosphorylase
What ion is increased extracellurly in ischemia? Intracellularly?
extracell: K+
Intra: Na, Ca, HCO3
(increased intra ca is marker of ischemic injury)
Buttock mass that has scallopping on histology vs no scalloping?
Scallop: Liposarcoma
No Scallop: Lipoma
What process is absent in lactose deficiency?
Gene processing (and thus lactase deficiency)
What is Cyclosporines mechanism of action?
Inhibits calcineurin, decrease IL2 transcription in T lymphocytes
What causes tardive dyskinesia?
Upreguilation of dopamine receptors in response to long term dopamine blockade
Why would a woman display a X linked recessive trait when she is heterozygous?
skewed x linked inactivation
Spasming person, presence of eosinophilic round cytoplasmic inclusions in neurons-dx?
Rabies
Renal perfusion pressure falls; what goes up?
Filtration Fraction (GFR and RBF both go down, but GFR does down less due to autoregulation)
What receptor fires to maintain BP when going from sit-> stand?
Alpha 1 adrenergic
Old woman refuses to leave her house for whatever reason, gets a rash that is dry, cracked yellow, dx and tx?
Xerosis (water itch), apply moisturezer after bathing
Why would you give probenecid with penicillin?
Inhibit renal tubular secretion of penicillin
Findings in 17 alpha hydroxylase deficiency?
Mineralcorticoid excess, loss of cortisol and sex hormones. Hypertension, hypokalemia, amennorhea/lack of sex chararacs/feminization in men
Why would a coughing fit make you pass out?
Increased intrathoracic pressure decreases venous return to heart, decrease CO, decrease cererbral perfusion
Lymphoma associated with overexpression of Bcl-2 and translocation?
Follicular lymphoma, t(14;18)
What does high estrogen in cirrhotic patients cause?
spider angiomata, palmar erythema, gynecomastia, testiclar atrophy, Dupuyrten’s contractures, decreased body hair
What type of hypersensitivity is Hemolytic disease of the newborn, What can be done ot test for it?
Type II hypersensitivity (cytotoxic, IgG mediated), do Indirect coombs (looking for presence of circulating IgG anti-Rh
What would you look at in a partenity case?
allotype (amino acids genetically inherited)
What type of hypsensitivity is tested on a PPD?
Type IV, Looking at TH1+macrophages (CD4, CCD14 on macrophages, IFngamma)
What is the most common cause of SCID? other cuases?
Most commonly loss of IL2 gamma chain. Can also be adenosine deaminase, decrase MHCII
What controls the response to toxoplasmosis?
TH1 (its an intracell organism)
What causes HyperIgM?
no CD40L on T cells; so can’t bind B cells, no class switching
What infections are seen in CGD; why?
Repeat Aspergillus, Staph, Candida (all catalse positive), loss of NADPH oxidase mutaiton so they not kijlled by free radicals (can’t make myeloperoxidase)
What is the method of inheritance of CGD? What tests can you do for it (and what are their results)?
X Linked (at least usually), Nitro blue dx–is NEGATIVE (so will remain clear because no NADPH oxidase) OR DHR Flow Cytometry (will be less green, less DHR produced)
What type of hypersensitivity reaction is rheumatic fever?
Type II Hypsesnsitivity (it is molecular mimicry)
Main things for neutrophil chemotaxis
C5a, IL8
What might you see in IgA deficiency
Recurrent URIs and GI infection (bcause of weka mucosal surfaces), maybe increased IgE (more ectopic allergy)
What is the apperance of IgA?
dimeric immunoglobulin
What is the only interleukin that turns down immune response, what makes it
IL10 (made by TH2, turns down TH1)
What does the spleen reticuloendothelial system do?
Clears opsonized capsulated bacteria (via macrophages)
What can opsonize?
IgG and C3b( most important, classical complment pathway), CRP, mannose binding lectipthin
Wht is the main initial response to a capsule bacteria, what clears the infeciton?
Neutrophils; IgG and the opsonization pathway clear completely
What is Serum Sickness?
A type III hypersensitivity antigen-antibody mediated immune reaction; complxes lodge in kidney and lung-> (complements activate, lyse, call neutrophils like any type III rxn)
What causes serum sickness?
decreased c3 and C4 (often due to drugs: suilfonamdies, allopurinol, penicllin, cephalosporin, antivenin (Rattlesnake antivenom)
Name the markers on B cells
CD19, CD20, CD21, CD40
What infections will occur in a C5-C9 defiicency?
increased nesisseria infections (no MAC)
What immune repsonse is this descriping: cell surface bound antibody bridging by antigen
Type 1 hypersensitivity
What is a tx for severe allergic asthma when steroids aren’t getting it done (with SABA)?
Omalizumab; recombinant IgG antibody
What is the defect in Chediak-Higsahi? Inheritance? What might you see on light microscopy?
Defect in neutrophil phagosome lysosome fusion; AR’ see giant lysosomal inclusions
What infections will you get in Chediak Higashi–other signs?
Recurrent staph/strep infections—albinism (abnormal melanin storage), nystagmus, peripheral and cranial neuropathies
Describe Wiskott-Aldrich
Classic triade of thrombocytopenia, reduced B and T cells and eczema (so get petechaie, purpura, hematemesis, epistaxis fomr lack of platlets). Platlets are SMALL AND DEFORMED
What infecitons are people with Wiskott-Alrich vulnerable to? Mechanism of inheritance? when does it get worse
Opportunistic (PCP, etc from lack of T cells), Capsules (no b cells, no humoral immnuity), X linekd male, worse at 6 months (lose mom antibodies)
See some circles on a lymph node biopsy; what are they; what do they hold; what goes on there
Probably germinal centers; B cells do isotype switching (interacts with CD40L on T cells)
arise from follicle I Reckon
What disease will germinal centers not form in?
Bruton X linked Agammaglobulinemia
What do regular cells secrete to halt viral protein syntehsis; why does it not affect humans?
Secrete type 1 inferferons alpha and beta; only affects double stranded RNA
What is loaded onto the surface of APCs before T cell interactions
MHC class II
What would be the consequence if the lysosome wasn’t acidified? Where does htis occur too
No MHC II loading; so endosome-lysosome fusion fails. Fucks up immune response. Occurs in rough er.
What prevents superficial candida infection? What prevents systemic candida infection?
Superficial: T cells
Systemic: Neutrophils
What is the difference between an inactivated and a live attenuated vaccine (and an example)
Inactivated: Humoral only
Live attenuated: Cell mediated and humoral
EG Strep Pneumo (in kids do live attenuated, old people inactivated so IgM only)
What is the advantage of the oral polio vaccine?
get an IgA duodenual lumen immunity
What do PD1 cell receptors do? What are htey expressed in abnormally?
They baiscally bind to PDL1 and prevent immune response. Tumors and cancer do this to avoid death. So now it is a treatment.
What do Ubiquitin proteasesomes do?
Break down a cell/virus-> couple to MHC1 in ER, put on cel surface for CD8 cells
What does IL2 do?
made y T helper, increaes B and CD4 and CD8 T cells, activates NK and monocytes
What immune cells try to contain metastatic renal cell cancer and melanoma (I think)?
NK and T cells
What is the mechanism of peripheral tolerance for T cells?
Anergy; T cells need a costimulatory signal from CD28-B7 to activate; without it they will not work. EVEN IF THEY GET A SECOND SIGNAL-still do not work
What is central tolerance
thymic selection process (negaitve selection) to prevent self attack
What is wrong in Hyper IgE/Jobs syndrome?
T helpers can’t make IFN gamma; failed neutrophil chemotaxis. Get staph abscesses, pruritic eczema, eosinophilia, increased IgE. ALSO Th17 fails to make IL17; get “leather face (thick skin”) and extra rows of teeth
What is Hapten?
Hapten doesn’t do anytihng alone but whne it binsd to protein you get a immune response.
How can penicillin act like happen/ hypersensitivity type
Penicillin induced hemolytic anemia (type II); basically acts like hapten and binds to RBC-> antibodies recognize an dkill-> anemia
What is the biggest marker of leukocyte adhesion deficiency?
CD18 is absent (lack integrin), get neutropenia (make them, just can’t respond)
What viral infeciton are NK cells particualrly important in?
herpesviridae infecitons
What is Chornic Mucucutaneous candididas?
basically a t lymphocyte issue specific to candida
Describe Ataxia-Telangiectasea
Chromo11q22-23 DNA repair issue. Often get ITA deficiency with spider angiomata, cerebellar ataxia, xray hypersensitivity, ocular and cutaneous teleganectias, more cancer, more isnpulm infections
Describe Langerhans Cell Histiocytosis
“Tennis Racket” guy; get oral ulcers, rashes, LYTIC xray lesions, conjunctival pallor, raised tender spots
What are langerhans cells?
basically dendritic cells; bring immune repsonse to T cells
What does Daclizumab do
Binds to IL2 receptor; reduces T cell response
Alpha, beta chains in MHCII vs MHCI?
MHC II: 1 alpha, 1 beta
MHC 1: 3 alpha, 1 beta
What is the treatment for Bruton Agammaglobulinemia?
IV Immunglobin (bone marrow WONT DO SHIT–T cells are fine)
If you give someone antibody to toxin, what type of immunity is that?
passive immunity
What is the main treatment for diptheria?
give them antitoxin (also do other shit like vaccine and antibodies), basically passive immunity
Where do you see c-ANCA?
in neutrophils of Granulopolyangitis (Wegners)
How would an asplenic crisis cause sepsis?
So get abdominal trauma or sickle cell-> can’t clear capsule organisms-> sepsis
What makes sputum green?
myeloperoxidase
What would cause an intrapulmonary shunt?
Adequate perfusion, NOT ventilation
What is transformation?
Direct uptake of extracellular dna by a virus (so a killed virus+live for example)
What is transduction?
Need a phage for bacterial gene change
What is conjugation
Pilus mediated DNA exchange between viruses; transfer DNA via F factor (Fertility factor)
How do transposons act in viral DNA exchange
basically are mobile gnetic elemetns and can do like anything (move within a gene, transfer gene to gene gene to plasmid whatever)
What do you need to watch for in viral myocarditis
Decompensated heart falure
What happens to ventricular compliance in diastolic heart failure
Goes down
What would be the big problem with a fib in aortic stenosis
Well its a sudden loss of preload (doesnt contract), also emboli issue
Why would someone with SLE have cushings and what would happen to the adrenals?
Exogenous glucocorticoids traet SLE; so adrenals atrophy because of lack of use
What viruses can do reassorment? Recombination?
Reassortment is SEGMENTED viruses
Recombination is more nonsegmented I guess probably both
What is the toxoplasmosis TX
Pyramiethaine, Sulfadiazine
What is the big side effect for Amphotericin B?
Nephrotoxic due to its effect on cell membranes (so could lead to hypokalemia and arrhythmias)
What is the function of NFkB?
It is a transcription factor in infection; normally it is in the cyotosl bound to IkB–when IkB gets destoryed (Via cell signaling) it actiavtes and ramps up immune response
What pulls clavicle in superior/posteiror direciton after fracture (at least the medial portion)?
SCM
What pulls a clavical fraction inferior/anterior
Pec Major (I guess if its further along it could be more lateral and deltoid)
What is Spongiosis?
Seen in contact dermatitis; edema fluid in epidermis
What are risks of hereditary spherocyotsis?
Hemolytic anemia, splenomegaly, jaundice, INCREASED pigmented gallstones (breakdown and shit), Aplastic crisis from Parvovirus B19
Risks of Sickle Cell?
I mean theres the finger issue, autoinfarct of spleen and avasc necrosis of femur as well, ACUTE CHEST syndrome (basically vasoocclusive issues), osteomyelitis from salmonella
how do you calcualte ejection fraction
SV/EDV (so can do ESV-EDV/EDV)
What are the symptoms of alcohol withdrawal
Insomnia, tremulosness, anxiety, autonomic hyperactivity (variable BP, tachycardia, diaphroesis)
How do oyu calculate half life
(0.7*Vd)/CL
What is made first in the tyrosine pathway- Norepi or Epi- what does this
Norepi; PNMT dependent
What causes painless bleeidng in old people out the ass?
Diverticulosis; sigmoid bleeding, NOT ITIS
What causes wound contracture/scarring?
myofibroblasts
How can pseudomonas cause black gangrene?
Has ADP ribosylating factor E2
What is the telltale sign of Sturge Weber syndrome?
PORT WINE STAIN (baby with the red shit on the face), also leukocornia (NO RED REFLEX), increased risk of glaucoma, ID, seizure, phenocromocytomia, leptomeningeial angiomatas