Mixed Block Notes 6 Flashcards
Soft Exudate
Grayish-white, cotton wool - due to microinfarct
Hard Exudate
Clear margins - due to leakage of protein
Absolute vs Relative Erythrocytosis
Red Cell Mass increased in Absoluate
Ureters lie antermedial to what structures in true pelvis
Internal Iliac
Death due to TCA toxicity
Cardiac Fast Na channel block –> Arrhythmia, Cardiogenic Shock
TCA’s also block
mAChR, alpha1, Cardiac Fast Na, H1; NE and 5-HT reuptake
Common precursor of Beta-Endorphin and ACTH
POMC (also yields MSH)
Gastroeneteritis with intestinal invasion
Salmonella, Shigella, EIEC, Campylobacter, Entamoeba histolytica
Stacked-brick intestinal adhesion
EAEC
Characteristic histologic findings in GERD
Basal zone hyperplasia, Elongation of lamina propria, Inflammatory cells (eo’s, Pmn’s, lymph’s)
First gen anti-histamines
Dim First Gen History Professors Dip Cope - Dimenhydrinate, Hydroxyzine, Promethazine, Diphenhydramine, Chlorpheniramine
Second gen anti-histamines
Second Gen History Certainly want tadine - Cetirizine, -adine
Bisphosphonates should be used carefully in patients with
Renal failure - Excreted unchanged
Common robertsonian translocations
14;21 and 21;22
Most susceptible parts of kidney to hypoxia
PCT, Thick Ascending Limb
Prophylaxis of cerebral vascular spasm following SAH
Nimodipine
Two types of pneumococcus vaccine
(23) Polysaccharide = B cell response = Less effective; (17) Polysaccharide conjugated to diph toxin = T cell response = better
Killed Vaccines
RIP Always = Rabies, Influenza, Polio, Hep A
3 adverse effects of all Protease Inhibitors
(1) Lipodystrophy; (2) Hyperglycemia; (3) P450 inhibition
What to use instead of rifampin for patients with mycobacterial infection in patients on protease inhibitors
Rifabutin
3 important mitochondrial syndromes
(1) Leber Hereditary Optic Neuropathy; (2) Myoclonic Epilepsy w/ Ragged-Red Fibers; (3) MELAS
Aortic Arch Derivatives
3 = Common/Internal Carotid; 4 = Aortic Arch, R Subclavian; 6 = Pulmonary Arters, Ductus Arteriosis
5 Dehydrogenase Cofactors
B1, B2 (FAD), B3 (NAD), B5 (CoA), Lipoid Acid
Prevention of neonatal tetanus
Vaccinate mom –> Placental transfer of IgG
Conversion of Pyruvate to PEP requires what 2 enzymes
Pyruvate Carboxylase, PEPCK
How can mitochondrial OAA be transported to cytosol
(1) Conversion to PEP; (2) Transamination to Aspartate; (3) Reduction to Malate
What step of CAC is GTP produced in?
Succinyl CoA to Succinate
Anti-arrhythmic specific for ischemic myocardium
Ischemic = Depolarized –> Lidocaine
What has currently replaced lidocaine for ventricular tachycardia
Amiodarone
Procainamide is more specific for arrhythmias arising from
Centers of normal automaticity
Prolonged administration of Verapamil pts with V Tach can
Lead to V fib and death –> Distinguish between Supraventricular and Ventricular Tach
Adenosine is used for
Acute treatment of Paroxysmal Supraventricular Tachycardia
Gene in PAH
BMPR2
Hypophosphorylated Rb prevents
G1 –> S (Hypophosphorylated = Active)
Colloid Cyst
Benign formation in third ventricle –> Lethal obstruction
Reticulin deposits and chronic inflammatory infiltrates in brain tumor
Xanthoastrocytoma
Activated Protein C inhibits
Factors Va and VIIIa
Aside from gas gangrene, C perf can cause
Late-onset food poisoining –> Transient watery diarrhea
X linked recessive disorders
Bruton, Wiskott, Fabry, G6PD, Ocular Albinism, Lesch-Nyhan, DMD, Hunter Syndrome, Hemphophilia, OTC Def
Autosomal Dominant disorders
HHT, Fam Hyperchol, FAP, MEN, NF1/2, Marfans, Her Spher, Achondroplasia, Huntingtons, Li-Fraumeni, BRCA1/2, Polycystic, Tuberous Sclerosis, vHL
HIV gene that is glycosylated and cleaved
ENV –> Gp140 –> Gp120 and Gp41
How does blood from Bronchial Arteries return
Majority to left heart in deoxy form via pulmonary veins (admixture); Some to right heart via azygous, acessory hemiazygous, or intercostal veins
Afferent fibers from Carotid and Aortic baroreceptors terminate in
Solitary nucleus of medulla
Histology of Psoriasis
Hyperparakeratosis, Acanthosis, Elongation of Rete Ridges, Mitotic activity above epidermal basal layer, Reduced or absent stratum granulosum
Munro microabscesses
PMNs form spongiotic clusters in superficial dermis and parakeratotic stratum corneum in Psoriasis
Advantage of proline in collagen
Kink the polypeptide chain and enhance rigidity b/c of their ring configuration
What happens to procollage once secreted
Cleaved C and N terminals –> Solubility decreases –> Collage fibrils –> Lysil Oxidase crosslinking
Alkaptonuria is a defect in what pathway
Tyrosine to Fumarate
What causes nipple inversion with breast cancer
Invades central region
What causes skin retraction in breast cancer
Infiltration of Cooper ligaments
Alternative to SSRI when sexual side effects occur
Bupropion
Xanthoma vs Xanthelasma
Xanthoma is surrounded by inflammatory cells and fibrotic stroma, Xanthelasma not
Ergonavine MOA
Constricts SM by stimulating both alpha adrenergic and 5-HT receptors
Phentolamine MOA
a1 and a2 blocker
In what part of bone is hematogenous osteomyelitis most likely
Diaphysis
Hyper IgM syndrome results from
Absence of CD40L on t cells or Genetic deficiency in isotype switching enzyme
Hyper IgM manifestations
Recurrent sinopulmonary infections; Lymphoic hyperplasia
IgA class switching is induced by
TGF-beta
Specific marker of mast cell activation
Tryptase (released in degranulation)
Antimicrobials that block ENaChannels
Trimethoprim, Pentamadine
Why is serum Na normal in Mineralocorticoid Excess
Aldosterone Escape via ANP –> Prevents edema and Na increase
Contraction alkalosis
Reabsorption of HCO3-
Where does uric acid precipitate in tubules
Low pH of Distal Tubules and Collecting Ducts
Penicillinase-stable penicillins
Nafcillin, Oxacillin, Methicillin
Prognosis of Capillary Hemangioma
Initially progress, eventually regress
Histology in De Quervain’s Thyroiditis
Mixed, cellular infiltrate with multinucleated giant cells
Opsoclonus-Myoclonus syndrome
Neuroblastoma
Why not use TCA with BPH?
Anti-Cholinergic –> retention
Why not use TCA with Orthostatic Hypotension?
Antagonizes alpha 1 peripherally
Causes of Hypercalciuria
Mainly Idiopathic; Also Hyperoxaluria, Hyperuricosuira, Low urinary volume, Hypocitratruria
Causes of Hyperoxalouria
Diet (chocolate, nuts, spinach; Low calcium diet (more oxalate absorbed)
Main radiographic finding in Mesothelioma
Nodular or smooth pleural thickening
Gold standard for Mesothelioma diagnosis
EM = Numerous long, slender microvilli with abundant tonofilaments (adenocarcinoma has short, plump microvilli)
Bronchioalveolar carcinoma has a characteristic
Distribution along alveolar septa w/out vascular or lymphatic spread
Gemcitabine vs Cytarabine
Both pyrimidine analogs, but Gemcitabine is not S phase specific, likely due to additional cytotoxic functions (eg inhibition of ribonucleotide reductase)
Methotrexate vs 5-FU
Both inhibit thymidalate formation, but only MTX overcome by Folinic Acid supplementation
Gottron papules and heliotrope rash
Dermatomyositis
Antidote for Cyanide (nitroprusside) toxicity
Sulfur (Sodium Thiosulfate) = Donates sulfur to liver rhodanase to enhance conversion of cyanide to thiocyanate
Microangiopathic hemolytic anemia
Small vessels = DIC, TTP, HUS
Triggers of G6PD
Bactrim, Dapsone, Antimalarials, Nitrofurantoin, Fava Beans
What is low in G6PD deficiency
NADPH
Cause of Lipofuscin
Free radical injury and lipid peroxidation
Most common location of supine aspiration
Right Lower Lobe
What underlies most cases of Hereditary Hypothalamic Diabetes Insipidus
Neurophysin II mutations
SPINK1
Trypsin inhibitor secreated by pancreatic acinar cells
Germ tubes when incubated at 37 degrees
Candida –> True Hyphae
Hep B replication
dsDNA –> Template +RNA –> dsDNA
Fate of tRNA that is mischarged
Will incorporate wrong AA into polypeptide chain (not corrected when charged by AA-tRNA synthetase proofreading)
MOA of mushroom toxins
Inhibit DNA-dependent RNA polymerase Type II = mRNA
RNA polymerase I vs II vs III
I = rRNA; II = mRNA; III = tRNA
MOA of Ricin
Cleaves rRNA component of 60S subunit
Resistance to Ethambutol
Increase production of Arabinosyl Transferase
Resistance to Streptomycin
Modification of 30S protein structure
Resistance to Pyrazinamide
Modify Pyrazinamidase, which must activate Pyrazinamide
MOA of Bosentan
Endothelin-receptor antagonist
Neutrophil Alk Phos
Elevated in Leukemoid reaction, Decr in CML
Acute Leukemia blast percentage
Greater than 20%
Eyelid manifestation of Primary Biliary Cirrhosis
Xanthelasma
Primary acceptor of amino groups during breakdown of other Amino Acids
Glutamate
Glycine + Methylene Group
Serine
What type of colonic adenoma can secrete mucus
Villous
Perfusion defect anatomically matched by ventilation defect
Collapsed lung
First test for PE
CT angiography
First line treatment for open angle glaucoma
Prostaglandins
Muscle responsible for accomodation? control?
Ciliary muscle - solely under cholinergic (m3) control