Uworld Added 1 Flashcards
Histology of GBM
Necrosis, Hemorrhage, Pallisading pattern
Histology of Meningioma
Psammoma bodies (also papillary thyroid carcinoma, serous papillary ovarian adenocarcinoma)
Histology of Oligodendroglioma
Fried egg appearance
PCNSL Histology
Uniform atypical lymphocytes
Lingual Thyroid
Thyroid tissue fails to migrate –> Removal cause hypothyroid
dx of asthma after Methacholine challenge
Decr in FEV1 of >20%
Cutaneous Neurofibromas –>
NF1 –> Autosomal Dominant (Chr 17)
Widened QRS converts to narrow during tachyarrhythmia in WPW b/c
accessory pathway no longer pre-excites but instead forms re-entrant circuit
EKG Triad for WPW
Shortened PR, Delta wave, Wide QRS
Linear deposits of Ig along glomerular basement membrane
Anti-GBM disease (Goodpasture) = Type 1 RPGN = Crescents on LM
Basement membrane splitting in kidney bx
Alport and MPGN Type 1
Uniform, diffuse wall thickening in kidney bx
Membranous Glomerulopathy
B6 is an essential cofactor for
Transamination and Decarboxylation of Aas, Gluconeogenesis
OAA + Glutamate –>
Aspartate and a-KG
Transamination reactions
AA and a-keto acid –> Amine transferred to a-keto acid, which becomes AA
Most common form of Galactosemia
Galactose-1-P uridyl transferase deficiency
What to check before initiating metformin therapy?
Serum Creatinine –> Lactic Acid accumulation (also contraindicated in hepatic dysfunction, CHF, alcoholism, sepsis)
Bloom syndrome is characterized by
General chromosomal instability
Ataxia Telangiectasia is characterized by
DNA hypersensitivity to ionizing radiation
Cardiac Output equation
- SV x HR; 2. (O2 consumption) / (AV O2 difference)
TCA cause what heart manifestation
Quinidine-like effect: QRS and QT prolongation by inhibiting fast Na channels
Treatment for cardiac TCA overdose
Hypertonic NaHCO3: Corrects QRS prolongation, Reverses hypotension, Treats ventricular dysrhythmias
What accounts for awakening from barbiturate anesthesia
Redistribution (not elmination)
MOA of Oxybutynin
M3 antagonist –> Decr IP3 –> Decr Ca (urge incontinence)
Common causes of myopathy with elevated CK
Hypothyroid, Muscular Dystrophy, Inflammatory Muscle Disease, HMG-CoA Reductase inhibitor
Fatiguability, Weight gain, and Myoedema –>
Hypothyroid
CK levels in Steroid-induced myopathy
Normal
Ciprofloxacin is NOT effective for
Anaerobic infections
Ceftriaxone has poor activity against
Anaerobes
Azithromycin is used for
Chlamydia, Mycoplasma, H flu, Moraxella
Permissive effects of cortisol
Incr vascular and bronchial smooth muscle reactivity to catecholamines
Valproate causes what birth defect
Neural Tube defects
PYR positive
GAS
What molecule is upregulated to mediate Transmigration
PECAM-1
Caspofungin is most active against
Candida and Aspergillus (not against Mucor or Rhizopus)
Selective Proteinuria
Albumin loss with minimal loss of more bulky proteins (IgG, Macroglobulin)
Most selective derminant for size in glomerulus
GBM and slit diaphragm (4nm)
Barrier to albumin loss in urine
charge selectivity
Tubular proteinuria
Presence of low molecular weight proteins in urine that should have been reabsorbed
Overload pronteinuria
Normally reabsorbed, smaller proteins exceed reabsorption capacity
Functional proteinuira
change in blood flow through glomerulus
Histologic features of Acute Viral Hepatitis
Ballooning degeneration, Mononuclear infiltrates, Councilman bodies
Anorexia, nausea, and low grade fever followed by bilirubinuria and R upper quadrant tenderness
Acute Hepatitis - most commonly caused by HAV in young adults
Pulmonary Vascular Resistance is lowest when
At Functional Residual Capacity (after casual exhalation)
Require cholesterol for growth in acellular media
Mycoplasma
MacConkey agar contains ___ to inhibit growth of contaminant
Bile
Virulence factor of E coli in neonatal meningitis
K1 capsular antigen
Virulence factor of E coli in non-bloody gastroenteritis
Heat stable/labile
Virulence factor of E coli in UTI’s
P (pyelonephritis) Fimbriae
Na channel binding strength among Class I Anti-arrhythmics
1C > 1A > 1B (correlates to use dependence)
MOA of BNP
Incr cGMP via GC
Slow acetylation affects which drugs
INH, Dapsone, Hydralazine, Procainamide
MOA of Rifampin
DNA-dependent RNA synthesis inhibition
Rifampin vs Isoniazid
Rifampin is not specific for mycobacteria
99mmTc-pertechnetate scan detects
presence of gastric mucosa
Digestive effects after sub-total pancreatectomy
Deficient in all digestive enzymes normally secreted by pancrease into duodenum
D-xylose absorption
Monosaccharide that can be absorbed direct w/out pancreatic enzymes
oral administration of fixed dose D-xylose
Differentiate b/t malabsorption of pancreatic vs GI mucosal etiology
Langhans Cells
Multinucleated giant cell with role in Granulomatous inflammation
Raquet-shaped intracytoplasmic granule
Birbeck granule in Langerhans cells
Merkel Cells
Basal layer neuroendocrine cells with role in touch
Portal triad runs in
Hepatoduodenal ligament
Which part of heart injured in stab wound to left 4th intercostal space
Right Ventricle
Two important steps in workup of metabolic alkalosis
Volume Status, Urine Chloride
Treatment of Vomiting/NG suction Metabolic Alkalosis
Isotonic saline for volume and Cl repletion
What leads to metabolic alkalosis that is saline unresponsive
Hyperaldosteronism or Hypercortisolism
Low blood-gas partition coefficient means
Poor solubility –> Blood saturates quickly –> Fast rise in partial pressure –> Faster brain saturation –> Faster onset time
High blood-gas partition coefficient means
High solubility –> Blood saturates slowly –> Delayed rise in partial pressure –> Slow brain saturation –> Slow onset time
Function of BRCA1/2
Double strand DNA break repair
Heritability of BRCA mutations
Autosomal dominant
Dysfunction in Alkaptonuria
Homogentisate Oxidase - Tyrosine to Fumarate
What in urine in Alkaptonuria imparts black color if oxidized
Homogentisic Acid
Ochronosis
Blue-black pigmentation in Alkaptonuria
Tx for combined absence and tonic clonic
Valproate
Tx for Absence Seizures
Valproate, Ethosuximide
Ethosuximide is not effective for
Tonic Clonic
Chronic effects of Obstructive Sleep Apnea
Reflexive systemic and pulmonary vasoconstriction and sympathetic cardiac stimulation –> Pulmonary HTN and Right Heart Failure
Hepatic Angiosarcoma is associated with
Arsenic, Thorotrast, Polyvinyl Chloride
CD31
PECAM1 –> Leukocyte migration thru endothium
IF microscopy in PSGN
Granular deposits of IgG, IgM, C3 = Starry Sky
EM in PSGN
Subepithelial humps = Antigen-antibody complexes
Longer menstrual cycles and irregular bleeding in adolescent
Anovulatory cycles due to immature HP-Ovarian axis
Transports ammonia from peripheral tissues to kidneys
Glutamine –> Glutamate + Free Ammonia Ion
Function of N-acetylglutatmate
Active Carbamoyl Phosphate Synthetase I in urea cycle
Nitrogen atoms in urea cycle are derived from
NH3 and Aspartate
Rate limiting enzyme in urea cycle
Carbamoyl Phosphate Synthetase I (activated by N-acetylglutamate)
Causes of HIV esophagitis
Candida, HSV1, CMV - Clinically indistinguishable, need endoscope
Endoscopic findings in Candidal Esophagitis
Patches of adherent gray-white pseudomembranes
Endoscopic findings in HSV-1 Esophagitis
Small vesicles that evolve into typical “punched out” ulcers
Endoscopic findings in CMV Esophagitis
Linear ulceration
Isospora belli
Profuse, watery diarrhea in HIV patients
Fever, Generalized LAD, Facial Edema, and Diffuse Morbilliform skin rash 2-8 weeks after drug exposure
DRESS!!!
Common drugs associated with DRESS
Anticonvulsants, Allopurinol, Sulfonamides
Drug-induced Anti-neutrophil cytoplasmic antibodies
Hyperthyroidism meds, Hydralazine
Mixed cryoglobulinemia is typically associated with
Chronic inflammatory states (SLE, HepC)
Purpose of squatting in Tetralogy of Fallot
Incr SVR/PVR ratio to prevent bypass of lungs
Synthesize dextrans from sucrose? Purpose?
Strep viridans –> Adherence to fibrin
Why does Strep viridans only bind to damaged endothelium
Adheres to fibrin, which is only deposited at sites of damage
Colistin kills
Gram negatives other than Neisseria
Reducing media
Used to culture organisms that reduce iron or sulfur
Result of incr in Hb saturation at lower oxygen mmHg
Erythrocytosis
Activated macrophages are necessary for
Delayed hypersensitivity reactions, Cytotoxicity against intracellular organisms
IL-12 receptor deficiency
Severe mycobacterial infections with inability to mount strong cell-mediated granulomatous immune response –> Tx with IFN-g
Infused citrate in packed RBCs can cause
Hypocalcemia (occurs with 5-6 liters of blood given over 24 hours)
6-MP and 6-TG are converted to active metabolites by
HGPRT
Degradation of activated 6-MP and 6-TG is done by
Xanthine Oxidase, Thiopurine Methyltransferase
Why give Allopurinol with 6-MP
Prevents inactivation by Xanthine Oxidase and greatly reduces needed dose
First line treatment for gestational diabetes
Diet then Insulin
Korsakoff syndrome is associated with damage to
Anterior and Dorsomedial Thalamic Nuclei –> Memory loss and Confabulation
Role of microglia in post-infarct repair
Move into area 3-5 days after onset of ischemia and phagocytize fragments of neurons, myelin, and necrotic debris
How does leptin regulate appetite, metabolism
Decr NPY in arcuate nucleus; Stimulates POMC/a-MSH in arcuate nucleus
EML4-ALK is seen in ___? Targeted therapy?
Non-Small Cell Lung Carcinoma (often nonsmokers with adenocarcinoma) –> Crizotinib
Sensorineural hearing loss, Tinnitus, Paralysis of facial muscles, Loss of corneal reflex –>
Vestibular Schwannoma affectiing V, VII, VIII –> Cerebellopontine angle
Specific symptoms of iron-deficiency anemia
Dysphagia, Koilonychia
Most common cause of Hydatid Cysts in humans
Echinococcus granulosus
beta adrenergic activity in coronaries
vasodilation
Oxygen content in Pulmonary Artery vs Coronary Sinus
Lower in coronary sinus because much more O2 used in myocardium than systemically
Prior strep infections are evidenced by
Anti-Streptolysin, Anti-DNaseB, Anti-Hyaluronidase
PYR Positive vs negative
GAS, Enterococci are PYR+; GBS, Bovis are PYR-
Etiologic agent of scrofula
Mycobacterium scrofulaceum
MOA of Nacetylcysteine
Glutathione substitute, Provides sulfhydryl groups to enhance non-toxic sulfation elimination of acetaminophen
Effect of glucocorticoids on liver protein synthesis
Incr Gluconeogenic and Glycolytic enzyme synthesis
Used to stimulate peristalsis in post-op ileus
Bethanechol, also to treat non-obstructive urinary retention
Effect of cholinergic agonist on glaucoma
Miosis causes iris to move further from cornea –> Widens anterior chamber and allows for better outflow of acqueous humor
Kidney histology in chronic transplant rejection
Vascular wall thickening, Luminal narrowing, Interstitial fibrosis, Parenchymal atrophy
What causes activation of RAS
GTP binding
NADPH is required as cofactor for
FA, Cholesterol, Steroid synthesis
MOA of Anastrozole
Aromatase inhibitor (+ Letrozole, Exemestane)
Bones associated with First Pharyngeal Arch
Maxilla, Zygoma, Mandible, Vomer, Palatine, Incus, Malleus
Bones associated with Second Pharyngeal Arch
Styloid, Lesser Horn of Hyoid, Stapes
Muscles associated with Second Pharyngeal Arch
Facial Expression, Stylohyoid, Stapedius, Posterior Digastric
Neonatal manifestations of Erythroblastosis Fetalis
Anemia, Jaundice, Edema, Nucleated RBCs, Extramedullary Hematopoiesis
Who gets oral thrush
Dentures, DM, Immunosuppressed, HIV
What causes problem with Fragile X expansion
Hypermethylation (not breakage)
What is unique to the duodenum
Brunner’s Glands - Located in SUBMUCOSA and secreted bicarb
3rd Aortic Arch Derivatives
Common Carotid, Prox internal carotid
4th Aortic Arch Derivatives
True Aortic Arch, Subclavian Arteries
6th Aortic Arch Derivatives
Pulmonary arteries, Ductus arteriosus
Effect of DKA on K
Incr excretion, Decr total stores, But increased extracellular
Homeless man with increased fatiguability and exertional dypnea, LE edema, decr sensation in periphery + cardiac dilation and incr CO
B1 deficiency (Beriberi)
Laryngeal edema and difficulty breathing after ACEi is due to
Kinin accumulation
Long acting benzodiazepines
Chlordiazepoxide, Chlorazepate, Diazepam, Flurazepam (Carefully Choose Due to Falls)
What are the dimorphic fungi?
Blasto, Histo, Paracoccidiodies, Coccidiodes, Sporothrix - Body Heat Purportedly Changes Shape
Removal of apical ectodermal ridge from newly formed limb bud
Shortened length, Abnormal ventral dorsal
Which aortic arch becomes Ductus Arteriosus
Sixth
Refsum’s disease
Myelin synthesis due to FA oxidation/synthesis disorder
Findings in Sarcoidosis
GRAIN - Globulinemia, RA, elevated ACE, Interstitial fibrosis, Noncaseating granulomas
pregnant woman hypotensive when supine
IVC compression –> lay on left side at night
Especially effective CT agent for Hodgkin
Vincristine
Location of the CTZ
Area postrema of the medulla
CV manifestations of Turner’s
Bicuspid Aortic Valve, Preductal Coarction of Aorta
Where is stratified squamous epithelium found in respiratory tract?
Oropharynx, Laryngopharynx, Anterior epiglottis, Upper half of posterior epiglottis, True vocal cords
MOA of Alpha-Glucosidase inhibitors
Prevent disaccharide breakdown in intestine, thus absorption
Role of adiponectin in T2DM
Low, increased by TZDs
Annular pancrease is caused by
Abnormal migration (not apoptosis) of ventral pancreatic bud
Bilateral lens subluxation, Massive stroke, Old renal infarcts
Homocysteinuria
Most patients with Homocysteinuria respond dramatically to
B6 supplementation
Fluoxetine overdose
Tachycardia, Drowsiness, Tremor, Vomitting, Nausea
Physical exam finding in AV fistula
Pulsative mass with thrill on palpation, Auscultation reveals bruit over site
SST decreases
Secretin, CCK, Glucagon, Insulin, Gastrin
AA’s that are metabolized to Propionyl CoA
Isoleucine, Valine, Threonine, Methionine
L-asparaginase
Antineoplastic by lowering circulating asparagine levels (leukemic cells collect asparagine from serum)
Symptoms, Signs of congenital hypothyroidism
Poor feeding, Prolongued jaundice, Constipation, Hypotonia, Hoarse Cry, Macroglossia, Myxedema, Umblical hernia
Which diuretic is used to decrease urine calcium
Thiazides
Most common cause of SVC syndrome
Bronchogenic Carcinomas
Most important HLA association with RA
HLA-DR4
HLA associated with SLE
HLA-DR2/3
HLA-A3 associated with
Primary Hemochromatosis
Lambert Eaton vs MG
LE doesn not improve with AChEi’s, Strength improves with repeated testing, Enhanced neurotransmission with repetitive stimulation
Limited vs Systemic Sclerosis Ab’s
Limited associated with Anti-centromere; Systemic with Anti-Topo 1
Kernicterus is most likely to affect which parts of CNS
Basal ganglia, Thalamus, Cerebellum, Cerebral gray matter, Spinal cord
Which hepatitis type is associated with PAN
Hep B (Hep C associated with Mixed Cryoglobulinemia)
Symptoms of Acute Intermittent Porphyria
Abdominal pain, N/V, Peripheral neuropathy, Paralysis, Psychiatric
Anti-mitochondrial Ab is a marker for
Primary Biliary Cirrhosis
Treatment of Lithium-induced DI
Amiloride - Blocks channel that lithium uses to enter principal cell
SLE on prednisone long term - what vitamin to supplement?
VITAMIN D
Toxicity of Nitrosureas
Carmustine –> pulmonary fibrosis
Accumulated intermediate in Acute Intermittent Porphyria vs Prophyria Cutanea Tarda
AIP = Porphobilinogen, PCT = Uroporphyrinogen
MOA of Bacitracin
Inhibits transfer of mucopeptides to growing cell wall
When do Red Neurons appear after cerebral ischemia?
12-24 hours
When does liquefactive necrosis appear after cerebral ischemia?
1-2 weeks
What can minors consent to when pregnant?
Prenatal care, Dx and Tx of STD’s, Drug and Alcohol Rehab; NOT abortions (or elective non-emergency procedures)
Acute transplant rejection is mediated by
T cell response against HLA/MHC antigens
Symptoms of Systemic Mastocytosis are induced by
Histamine releas
What is pulsus paradoxis
Decr systemic blood pressure during inspiration (incr venous return deviates IV septum toward left and blocks outflow)
When does Pulsus Paradoxis occur
Acute cardiac tamponade, Constrictive pericarditis, Severe obstructive lung dz, Restrictive CM
Most significant factor in Shigellosis
Mucosal invasion, not toxin
Confusion, Fever, Nausea, Elevated LFT’s four days after anesthesia
Massive hepatic necrosis from Halothane
Hepatic Granulomatosis is associated with
Methyldopa, Hydralazine, Quinidine
MOA and use of Primidone
First line for benign essential tremor; MOA unknown but metabolizes to phenobarbital
Activation of Intrinsic vs Extrinsic pathway
Intrinsic by damaged vessel (XII), Extrinsice by tissue damage (TF, VII)
Defect and major manifestations of Type 1 Dyslipidemia
LPL, ApoC –> Chylomicrons –> Acute pancreatitis, Xanthomas, HSM
Defect and major manifestations of Type 2a Dyslipidemia
LDL, ApoB-100 –> LDL –> CAD, Corneal Arcus, Tendon Xanthomas
Defect and major manifestations of Type 3 Dyslipidemia
ApoE –> Chylomicron, VLDL remnants –> CAD, PVD, Xanthomas
Defect and major manifestations of Type 4 Dyslipidemia
ApoA-V –> VLDL –> Pancreatitis, Obesity, Insulin resistance
Purine Antimetabolites
6-MP, 6-GP, Fludarabine, Cladribine
Use of Cladribine
Hairy Cell Leukemia - Resistant to Adenosine Deaminase
Bupropion is contraindicated with
Anything that can lower seizure threshold (eg electrolyte disorders from bulemia)
Good samaritan law
Standard of care must be met (meant to protect people, including off duty medical professionals, who help in accidents/emergencies)
Laplace’s Law
P=2T/r
Uptake of unconjugated bililrubin occurs via
Organic Anion Transporting Polypeptide (OATP) - passive
Conjugated bilirubin is secreted from hepatocytes via __? This is blocked in __?
MRP2 (active organic anion transporter) - Criggler-Najjar, Rotor
Concentration of Bicarb along Proximal Tubule
Actively reabsorbed due to Carbonic Anhydrase –> Acetazolamide causes excretion
How to differentiate MAC from MTB in HIV patient
MAC has anemia, HSM, incr ALP/LAD due to widespread involvement of RES; Also grows well at 41degC
Prophylaxis and treatment of MAC
Proph with Azithromycin; Tx with Azith + Ethambutol or Rifampin
Absence of ganglion cells in colonic wall causes
affected segment to narrow (can’t relax)
Which parts of GI tract are always involved in Hirschprung
Since NCC’s migrate caudally, rectum always involved
How does metabolism of drug relate to drug-induced lupus?
Slow acetylators more likely (hydralazine, procainamide)
Most liver hydrolysis involve what enzymes
Amidase, Esterase
When is Exenatide used?
(GLP-1) Suboptimal glucose control in patients already on Metformin and Sulfonylureas
Ventricular response to AF is dependent on
Transmission through AV node
What types of viral genomic material can be individually infective?
Positive Linear ssRNA
Interstitial pneumonia in transplant patient
CMV
Treatment of C. diphtheria
Antitoxin –> Penicillin or Erythromycin –> DPT vaccine
Most common cause of death from C diph
Cardiomyopathy
Features of Cutaneous Neurofibromas
Rubbery, Buttonholing
Features of Wiskott-Aldrich
Thrombocytopenic Purpura, Eczema, Recurrent infections
Acute Narrow Angle Glaucoma is often precipitated by
Anticholinergics –> Anterior chamber narrows, obstructing trabecular meshwork
Confirmatory test for calculus cholecystitis
HIDA scan (not ultrasound)
Stool osmotic gap? What increase?
Colonic fermentation products –> Increased when poorly absorbable substances present (lactose)
Nonpolar Aliphatic Hydrophobic AA
VIP GAL - Valine, Isoleucine, Proline, Glycine, Alanine, Leucine
Aromatic Hydrophobic AA
Try Trippin w/ Phenytoin - Tyrosine, Tryptophan, Phenilalanine
Basic/Positive AA’s
Shallow HAL is positive - Hystidine, Arginine, Lysine
Acidic/Negative AA’s
Glutamate, Aspartate
Hydrophilic uncharged AA’s
Come, Take My GAS! - Cysteine, Threonine, Methionine, Glutamine, Asparaine, Serine
When is Arginine essential?
During + nitrogen balance
Non-lactose fermenting, Oxidase negative organism in Sickle Cell Osteomyelitis
Salmonella
Oxidase Positive bugs
Vibrio, Pseudomonas, Campylobacter, Helicobacter, Neisseria, Moraxella, Legionella
Main virulence factor of S aureus in osteomyelitis
Adhesion to collagen
Apo E4 predisposes to
Late-onset familial Alzheimer’s
Hypertrophic CM trait
AD - Beta myosin heavy chain
MOA and use of Dezrazoxane
Iron chelating agent to prevent cardiotoxicity from Anthracyclines
Location of 5-HT3 receptors implicated in chemo n/v
Peripherally in presynaptic nerve terminals of vagus in GI, Centrally in CTZ and Solitary nucleus/tract
Loop diuretics stimulate release of
Prostaglandins –> incr renal BF
Most common benign tumor of breast
Fibroadenoma (<35, often bilateral, cyclinc)
Fibroadenoma histology
Cellular, often myxoid stroma that encircles and sometimes compresses epithelium-lined glandular and cystic spaces
Function of vWF
Platelet adhesion by crosslining GpIb with exposed collagen underneath damaged endothelium
Secondary role of vWF
Carrier protein for factor VIII
Proteins C and S act to inactivate
V and VIII
Thrombin is produced from Prothrombin by
Activated Factor X
Growth Hormone binds to a __ receptor
JAK-STAT
Lecithin-Sphingomyeline Ratio is a marker for
Lung maturity (>1.9 = mature)
Mechanism of methicillin resistance
Alterations in PBP2a (also affects cephalosporins)
Immunity to reinfection by influenza is mediated by
Circulating antibodies against Hemagluttinin
Tumor originating from collecting duct cells
Renal Oncocytoma
Transitional cell tumors of pelvis are often what morphology
Papillary
Niacin-induced flushing is mediated by
Prostaglandins
___ reduces pain by decreasing level of substance p in PNS
Capsaicin
Clinical uses of Valproate
Anticonvulsant (absence, myoclonic, grand mal) AND mood stabilizer (acute mania, bipolar)
Anticonvulsants used as mood stabilizers in bipolar
Valproate, Carbamazepine, Lamotrigene
Carbamazepine indications
Trigeminal Neuralgia, Manic episodes, Partial and generalized seizures
MOA and use of Olanzapine
second gen antipsychotic
QT interval reflects
Myocyte AP duration
Two congenital syndromes that cause QT prolongation
- Jervell Lange-Nielson (AR, neurosensory deafness); 2. Romano-Ward (AD, no deafness)
Mutations affecting cardiac cell cytoskeletal proteins or mitochondrial enzymes of ox phos are though to cause
Genetic Dilated CM’s
Mutations of calcium-binding SR protein might underly
Arrhythmogenic RV Cardiomyopathy –> Progressive fibrofatty replacement of RV
Extramedullary hematopoesis is most frequently associated with
Chronic Hemolytic Anemias (eg beta thal)
Pentazocine
Opioid narcotic designed to produce analgesia with little to no abuse potential (weak antagonist at mu)
Short-acting benzos
ATOM - Alprazolam, Triazolam, Oxazepam, Midazolam
Long-acting benzos
Choose Carefully Due to Falls - Chlordiazepoxide, Chlorazepate, Diazepam, Flurazpam
Malabsorption, Diarrhea, PAS-positive granules in intestinal macrophages
WHIPPLES DISEASE - Tropheryma whippelii
Recurrent infections with Strep pneumo, H flu, and Moraxella indicate
Humoral immunodeficiency
Pneumocystis and chronic mucocutaneous candidiasis indicate
T cell deficiency
Immotile cilia syndrome presents in newborn period with
Respiratory distress –> Recurrent Otitis Media, Bronchitis, Sinusitis (opprotunistic infections like PCP unusual)
Agammaglobulinemia means susceptible to
Extracellular, encapsulated bacteria
Exchange of viral dna in coinfection by non-segmented viruses
Recombination
Viral phenotypic mixing
Coinfection leads to one virus with nucleocapsid protein from another
AE’s of TZD’s
Weight gain, edema, CHF
Damage to the Caudate is associated with
Transient hemiparesis and frontal lobe symptoms such as inattentiveness, abulia, forgetfulness
Compression fracture in elderly woman –> Calcium and PTH?
Normal
Driver of respiratory function in COPD vs normal
pO2 in COPD vs pCO2 normally –> Supplementary O2 in COPD will lead to respiratory suppression and coma
Main toxin of C perf
Lecithinase (phopholipase C, alpha toxin)
Insular cortex is associated with
Integrating body states w/ emotions (limbic); ANS control; Conscious experience of visceral sensations
Damage to internal vs external Globus Pallidus
Internal –> Excessive movement; External –> Decreased
Role of D arm of tRNA
Dihydrouracil residues –> Helps facilitate correct tRNA recognition by proper Aminoacyl tRNA synthetase
Role of T arm of tRNA
Binding tRNA to ribosomes
Only RNA that contains thymidine
T RNA
NE to Epinephrine requires
SAM - PNMT enzyme
BH4 is required for synthesis of
Tyrosine, DOPA, Serotonin, Prolactin
Winter’s Formula
PaCO2 = (1.5*HCO3) + 8 +/- 2
Media for growing V cholerae
Alkaline - extremely acid sensitive organism
Mechanism of hepatocyte damage in Hep B
CD8 response to viral antigens on cell surface
Regulatory HIV genes required for replication
Tat, Rev
Structural HIV genes
Gag, Pol, Env
Products of Gag, Pol, Env genes in HIV
Gag - p24, p7; Pol - RT, Integrase, Protease; Env - gp120, gp41
Function of HIV nef gene? Rev? Tat?
Nef - Downregulate CD4 and MHC 1; Rev - Transport of unspliced viral transcripts out of nucleus; Tat - Protein that transcriptionally activates other viral genes
Features of Colitis-associated CRC vs sporadic
(1) younger; (2) Flat or non-polypoid dysplastic precursor; (3) Mucinous and/or signet ring morphology; (4) early p53 and late APC - opposite of sporadic; (5) proximal colon; (6) Multifocal
MOA of Varenicline
Partial agonist at nicotinic ACh receptor
Pentamidine is used for
Prophylaxis and tx of PCP
Nifurtimox is used for
Chagas treatment
Normal alveolar pO2
104 mmHg (if higher, poor perfusion)
When is O2 equilibration diffusion-limited
Emphysema, Fibrosis, Very high blood flow (ie exercise)
A, I, and H bands
A is thick myofilament, I is Actin only, H is Myosin only
Pharmacodynamic Drug Antagonism
Drug can antagonize or prevent effect of another drug or endogenous substance
Pharmacokinetic drug interaction
eg CYP inducers
Treatment of recurrent C diff colitis
Fidaxomicin
MOA of Fidaxomicin
Inhibits sigma subunit of RNA polymerase; Less effect on normal flora; Poor oral
Most common cystic fibrosis mutation and result
dF508 –> Impaired post-translational processing and results in proteasome degradation
AA’s with three titratable protons
Acidics, Basics, CT = Glutamate, Aspartate, Histidine, Arginine, Lysine, Cysteine, Tyrosine
Salicylate acid base disorder
(1) Rapid respiratory depression causing alkalosis; (2) A few hours later metabolic acidosis
Effect of ANP on kidney, Adrenals, BVs
Dilates afferent arterioles, Inhbitis Na reabsorption, Restrict aldosterone secretion, cGMP-mediated veno- and arteriodilation
Type of MI usually associated with Bradycardia
Inferior - SA/AV nodal branch block
ANS drug that can cause Glaucoma
Atropine –> Midriasis –> Narrowing of anterior chamber
Anti-mitochondrial Ab’s
Primary biliary cirrhosis
Anti-Smith Ab’s
Anti-snRNP = Specific for SLE
Rapid atrophy and shrinkage of liver on autopsy
Halone-induced liver failure
Shortest half life pro-coagulant factor
Factor VII (PT)
What enzyme produces urea in Urea cycle
Arginase (Arginine –> Urea + Ornithine)
Excessive amounts of Orotic acid are usually found in
OTC deficiency, Citrullinemia, Arginosuccinate aciduria
Low levels of C1 esterase inhibitor
Hereditary Angioedema
Mechanisms of C1 esterase inhibitor
Inhibit C1 –> Activated C1; Inactivates Kallikrein (which converts Kininogen to Bradykinin)
16S rRNA function
Component of 30S subunit –> Expresses sequence complementary to Shine-Dalgarno in all prokaryotic mRNA
23S rRNA function
Peptidyltransferase - Peptide bond formation
Pontiac Fever
Legionella –> Acute, flu-like, self-limited disease
Features of Legionnaire’s Disease
Recent expsoure to contaminated water, Pneumonia, High Fever; Sometimes GI, Relative bradycardia, neurologic
Most common lab finding in Legionnaire’s
Hyponatremia
Bilateral ACA occlusion
LE motor, Behavioral (abulia), Urinary incontinence
Spread of H flu vs N meningitidis to meninges
H flu uses lymphatics, N men is hematogenous, Both from Pharynx
MOA of Organophosphates
AChE inhibitors
Bromoacetylcholine MOA
Inhibits Choline Acetyltransferase
Nicotininc receptor antagonists
Pancuronium, Tubocurarine
Hemicholinium MOA
Choline import into presynaptic terminal
Train of Four seen in Non-depolarizing blockade
eg Tubocurarine - Slanted within group, Group increases each 4
Train of Four seen in Depolarizing blockade
Equal within group, Group increases each four (phase 1) –> Resembles slanting of non-depolarizing in phase 2
Neostigimine in Phase 1 vs 2 of Succinylcholine NMB
Augments blockade in Phase 1, Reverses it in Phase 2
Duration of Succinylcholine action depends on
Diffusion out of NMJ and metabolism by plasma cholinesterase
Nitrate with best bioavailability
Isosobide Mononitrate
Hep B Window Period
Time lag betwee HBsAg disappearing and Anti-HBs appearing
Most specific marker for diagnosis fo acute Hep B
Anti-HBc IgM –> Present in window period
Vitamin E deficiency manifestations
Neuromuscular disease (myopathy, ataxia, pigmented retinopathy, dorsal column) and Hemolytic anemia
Vitamin E primarily serves to
Protect fatty acids from oxidation –> Neurons and erythrocytes most susceptible
Vitamin C excess
Nausea, Abdominal pain, Diarrhea, Stones
Physostigmine vs Neostigmine and Edrophonium
Neostigimine and Edrophonium are Quaternary Amines and can’t cross BBB
Tarry stool and fatigue are seen with what CT agents
Alkylating agents (upper GI bleed)
Abdominal pain and jaundice may be seen with what CT agent
Mercaptopurine (cholestasis and hepatitis)
Flagellate skin discoloration is seen with what CT agent
Bleomycin (along with pulmonary fibrosis)
Nitroblue Tetrazolium testing
Properly functioning PMNs produce ROS that reduce yellow NBT to dark blue formazan that precipitates within the cells
DHR flow testing
NADPH oxidase shows decr fluorescence
NBT and DHR testing in MPO deficiency
Normal
Pyruvate kinase deficiency is a common cause of
Chronic Hemolytic Anemia
Ortner Syndrome
Mitral Stenosis –> LA enlargement –> Impingement on Recurrent Laryngeal N
Location of Glut-2
Regulation of Insulin Release –> Hepatocytes, Beta cells, Renal tubular cells, Small intestine
Location of Glut-3
Placenta, Neurons
What is commonly found regarding uterus on vaginal vaginal examination in Endometriosis
Nodularity of uterosacral ligaments, Fixed retroversion of uterus
Ectopic endometrial tissue secretes
PG’s –> Interfere with ovulation and tubal function –> Infertility
Adenomyosis
Presence of endometrial glands w/in uterin myometrium (presents with bleeding, painful menses, and enlarged uterus unlike endometriosis)
When to give Ribavirin with RSV?
Confirmed, severe RSV at risk for dz progression (immunodeficiency, prematurity, cardiopulmonary disease)
Mechanism of Shiga-like toxin
AB - A subunit prevents binding of tRNA to 60S ribosomal subunit
Bactrim is drug of choice for
Pneumocystis jiro, Toxoplasma, Nocardia
Hyoscyamine
Anti-muscarinic to counteract AChEi in Myasthenia Gravis
Side effects of Thiazide Diuretics
Hyper Glycemia Lipidemia Uricemia Calcemia
Medication-induced fat redistribution
Corticosteroids, HAART (Protease inhibitors)
Chronic Eosinophilic Bronchitis in asthmatics involves
Bronchial wall infiltration by numerous activated eosinophils in response to IL-5 by allergen-activated TH2 cells
Class 3 Anti-arrhythmics
Amiodarone, Ibutilide, Dofetilide, Sotalol
Which vitamin supplement should be given to child with Measles
Vitamin A - Reduces time to recovery from pneumonia and diarrhea, as well as risk of death
Which HIV drug to give to pregnant women
Zidovudine
Protein secondary structure is due to
Hydrogen bonds (Tertiary due to ionic bonds, hydrophobic interactions, hydrogen bonds, and disulfide bonds)
E coli aquired ability to form pili via
Conjugation
Strep pneumo aquired capsule via
Transformation
Function of Thyroid Peroxidase
Oxidize inorganic iodide to organic iodine; Formation of monoiodotyrosine and diiodotyrosin; Coupling of these to iodotyrosines
Lab studies in HUS
Only bleeding time elevated
Bacitracin MOA
Prevents mucopeptide transfer into growing cell wall
Trimpethroprin, Methotrexate, and __ inhibit DHFR
Pyrimethamine
Important Bactrim AE’s
Hyperkalemia, Megaloblastic Anemia
Serotonin Syndrome effects
HARM - Hyperthermia, ANS instability, Rigidity, Myoclonus
Drugs that precipitate Serotonin Syndrome
TTYL - Tramadol, Triptans, trYcyclics, Linezolid
Features of Myotonic Dystrophy
Frontal balding, Gonadal atrophy, Arrhythmia (My toupe, my testicles, my ticker); sustained grip, type 1 fiber loss
Most important signalers in Coronary autoregulation
Adenosine, NO
What causes NO release in coronaries
Pulsatile stretch, Flow shear stress
What subtype not stimulated by NE
Beta 2
Skeletal Muscle Depolarization –>
L-type channel-RyR mechanical coupling (no significant flux of Ca across L-type Ca channel) –> RyR1 opening –> Binds Troponin C
Cardiac Muscle Depolarization –>
L-type Ca influx on PM –> RyR2 opening
Smooth Muscle Depolarization –>
v-gated L type Ca influx –> Calmodulin (no troponin) –> Myosin light chain kinase –> P-lation of myosin
Nonselective beta blocker with a1 blocking activity
Labetolol
Systemic sequelae with Diphtheria
Myocarditis, Heart Failure, Neurotoxicity
EKG leads for LAD
V1-V3
Type 3 collagen is found in
Granulation tissue, Skin, Lungs, Blood vessels
Bell vs Diaphragm
Bell = Low freq; Diaphragm = High
S3 on end expiration
More audible, Heart closer to chest wall
Localized amyloidosis confined to cardiac atria
ANP-derived (elderly)
Prolyl Hydroxylase –>
Proline on Procollagen –> Stable triple helix
Lysyl Hydroxylase –>
Stronger
Bepridil
CCB - Second line anti-anginal drug
Loud P2 =
Pulmonary hypertension
Kussmaul =
Paradoxical rise in JVP during inspiration
Don’t use DPH-CCB with
Acute Coronary Syndrome (reflex tachycardia)
Digoxin toxicity
Hyperkalemia, Vision, N/V/D
Afib with RVR: tx –>
CCBs, BBs, then Digoxin second line
Lidocaine is for what arrhythmias
Ventricular, not Atrial
Mechanism of Fibrates
Peroxismal Proliferator-Activated Receptor Alpha –> LPL activity increase –> Decr TB, Raise HDL
How do assess severity of Mitral Regurg
Presence of S3 gallop
Defect in Chediak-Higashi
Phagosome-Lysosome fusion –> Recurrent pyogenic infections with Staph and Strep
Features of Chediak-Higashi
Immunodef, Albinism, Neurologic (nystagmus, cranial neuropathies)
Phosphorylation of NRTI’s vs NNRTI’s
NRTI’s must be phosphorylated
Most important mechanism of lead poisoning
Affinity for sulfhydryl groups –> Inhibition of d-ALA dehydratase and ferrochetolase
Formation of d-ALA
Succinyl-CoA and Glycine via Pyridoxal Phosphate cofactor
Cause and manifestation of acute serum sickness
Type 3 (IC deposition) –> Fever, Pruritic skin rash, Arthralgias, Fibrinoid necrosis, Hypocomplementemia
Serum sickness can be caused by
Chimeric monoclonal Ab’s, Nonhuman Ig’s, Nonprotein drugs (eg penicillin, cefaclor, bactrim)
Osteolytic phase of Paget’s is due to excess
RANK signaling, NFKB activation
Pattern of bone in Osteoblast phase of Paget’s
Dense, hypovascular, mosaic pattern of lamellar bone with irregular, haphazardly oriented sections separated by prominent cement lines
What stimulates Inhibin B secretion
FSH stimulation of Sertoli cells
MOA of trihexyphenidyl
centrally-acting anti-muscarinic
Anti-cholinergics such as benztropine and trihexyphenidyl should be avoided in elderly patients, esp with
BPH, Angle-Closure Glaucoma
S-100 protein function
Homodimeric calcium-binding proteins, important for protein p-lation, cell growth, and differentiation
S-100 marks what cells
Neural Crest (melanocytes, Schwann), Langerhans and other dendritic
DLCO depends on
Thickness and total SA of alveolar capillary membrane, Hematocrit, Total volume of pulmonary capillary blood
DLCO in emphysema vs chronic bronchitis
Reduced in Emphysema, Normal in CB
Mechanism of Bohr effect
CO2 –> H+ and HCO3+ –> H+ binds histidine side chains of Hb –> Stabilize deoxygenated form of Hb
What happens to H+ and HCO3 in RBC from CO2
H+ binds Hb; HCO3 exchanged for Cl (Cl enters)
Which step of Glycolysis utilizes NAD+
G3P –> 1,3-BPG
When is FADH2 produced
During conversion of succinate to fumarate
Synthesis of Carnitine
Lysine + Methionine via Vit C cofactor
Citrate is formed from
Condensation of Acetyl CoA w/ OAA
Heart Failure definition
(1) Cannot pump enough blood to meet demand; or (2) Can onliy do so from elevated ventricular filling pressure
Diarrhea in pellagra results from
Columnar epithelium atrophy
NAD functions as a coenzyme for
Dehydrogenases involved in metabolism of fats, carbs, and amino acids
Niacin can be synthesized endogenously from
Tryptophan
Populations that primarily subsist on __ are prone to developing pellagra
Corn (niacin in corn is bound and unabsorbable)
Pellagra is less commonly seen in what patient populations
Carcinoid, Prolonged INH, Hartnup (more commonly in alcoholics and chronic disease)
Arginine is a precursor of
NO, Urea, Ornithine, Agmatine, Creatine
Orotic acid is a precursor of
Pyrimidine
Ab-dependent cellular cytotoxicity is defense against
Virus, Parasite
Function of MPO
Hypochlorite from H2O2 and Chlorine
Testicular feminization syndrome =
Complete Androgen Insensitivity = Absent Wolffian and Mullerian structures
Pulmonary hypertension is usually found in patients with
Scleroderma
H1 receptors are found in
Vascular endothelium, Bronchial smooth muscle
5 important classes of meds with Anti-muscarinic effects
Atropine, TCA’s, H1 blockers, Neuroleptics, Anti-Parkinson - NATHA
MOA of Ribavirin
Nucleoside antimetabolite - (1) Lethal hypermutation, (2) Inhibit RNA polymerase and IMP DH (depleting GTP), (3) Defective 5’-cap formation on viral mRNA, (4) Modulating a more effective immune response
Bone turnover is regulated by ratio of
RANKL to OPG - incr when RANK-L high and OPG low
How does PTH activated Osteoclasts
Stimulates Osteoblasts to upregulate RANKL and secrete M-CSF –> Osteoclast maturation
Function of Osteoprotegrin
Decoy RANK-L receptor
Arachnodactyly, Scoliosis, and Aortic Root Dilatation are signs of
Marfan
Macroorchidism, Large Jaw, and Intellectual disability are signs of
Fragile X
Top 3 causes of meningitis in neonates
GBS, E coli, Listeria
Courses between Biceps brachii and Coracobrachialis
Musculocutaneous
Courses between Flexor Carpi Ulnaris and Flexor Digitorum Profundus in forearm
Ulnar
Courses between Flexor Digitorum Profundus and Flexor Digitorum Superficialis
Media N
Substrate for PRPP synthetase
Ribose-5-Phosphate
Gout occurs with increased frequency in patients with activating mutations of
PRPP Synthetase
First line for Acute Gouty Arthritis
NSAIDs (Colchicine second)
How does pregnancy affect gallstones?
Estrogen-induced cholesterol hypersecretion (HMG CoA Reductase); Progesterone reduces bile acid secretion and slows gallbladder emptying
Fluid-filled cavitiy in liver + Fever, Chills, RUAbdominal Pain
Most likely bacterial abscess in developed nation
Pyogenic bacteria most commonly gain access to liver via
Biliary tract, Portal vein pyema, Hepatic artery
How does RBC carry CO2
15% as carbamate on Hb, Remained as bicarb ion w/in RBC
Diuretic often used in management of Cerebral edema and Incr ICP
Mannitol
Overaggressive treatment with osmotic diuretic therapy
Excessive volume depletion and eventual hypernatremia
Osmotic diuretics should be used cautiously in what patients
CHF, Pre-existing pulmonary edema
Spironolactone side effects
Hyperkalemia, Gynceomastia, Decr libido, Erectile dysfunction
The risk of statin myopathy is increased when
Fibrates and/or Niacin also used
Drugs that can cause myopathy
SGFC PHIN - Statins, GC’s, Fibrates, Colchicine, Penicillamine, Hydroxychloroquine, IFNa, Niacin
MOA of Fenodolpam
Benazepine derivative of DA –> Selective DA-1 agonist with no effect on alpha or beta receptors
Stimulation of DA receptors in kidneys
Improves RBF and Na and Water excretion
Fenoldopam is indicated for
Short term management of severe HTN
Use and risk of Nitroprusside
Most effective agent for most cases of HTN emergency –> Cyanide toxicity
Vimentin is a marker for
Mesenchyme
Chromogranin A
Neuroendocrine tumors
Imperforate anus is most commonly associated with
GU malformation - VACTERL (vertebral, anal atresia, cardiac anomalies, TE fistula, esophageal atresia, renal anomalies, limb anomalies)
Fibrinous pericarditis is most commonly caused by
MI, RF, Uremia; Also viral
Pericardial knock
Brief, high frequency, precordial sound heard shortly after S2 in constrictive (chronic) pericarditis
Heme in the liver is synthesized for
CYP450 system
Acute Intermittent Porphyria can be precipitated by
Phenobarbital, Griseofulvin, Phenytoin, Low calorie diet, Alcohol –> All decr hepatic heme –> Incr ALA synthase activity
Heme synthesis enzymes inhibited by lead
ALA dehydratase, Ferrochetolase
Influenza vaccine induces
Neutralizing antibodies against Hemagglutinin
Why don’t killed vaccines stimulate CD8 response
They don’t enter host cell for MHC Class 1 presentation
Sensory nerve to parietal pleura
Phrenic to Diaphragmatic and Mediastinal; Intercostal to remainder
Superficial Inguinal Nodes drain
Nearly all cutaneous lymph from umbilicus to feet, including external genitalia and anus
Lymph from Glans penis and cutaneous portion of posterior calf drain into
Deep inguinal lymph directly (bypassing superficial)
Effect of cyanide poisoining
Inhibits cytochrome C oxidase - SaO2 of venous blood increases due to failure of oxygen unloading
Crescents of RPGN are composed of
Proliferated glomerular parietal cells, Monocytes, Macrophages, Fibrin
Inactivated HFE increases iron by
(1) Incr DMT1 on enterocytes; (2) Decr hepcidin –> Incr ferroportin expression
Atypical antipsychotics most and least likely to cause EPS
Clozapine least likely, Risperidone most likely
Top 3 risk factors for Coronary Heart Disease
Noncoronary Athersclerotic Disease, Diabetes Mellitus, CKD
Pineal Tumors most commonly cause
Parinauds, Precocious puberty, Obstructive hydrocephalus
Short acting insulins
Lispro, Aspart, Glulisine
When to use regular insulin
DKA
What accounts for delayed onset of regular insulin
Dimer and hexamer formation (short acting are monomers)
NPH insulin works by
Crystalline suspension with protamine and zinc –> Delays absorption
Detemir insulin works by
FA bound to lysine –> Binds albumin and slowly dissociates
MAOi’s
MAO Takes Pride In Shanghai = Tranylcypromine, Phenelzine, Isocarboxazid, Selegline (B selective)
SSRI’s
Flashbacks Paralyze Senior Citizens = Fluoxetine, Paroxetine, Sertraline, Citalopram
SNRI’s
Venlafaxine, Duloxetine
How quickly after ischemia does loss of contractility occur in cardiomyocytes?
60 seconds
At what timepoint is myocardial ischemia irreversible
30 minutes
Ligands for Receptor Tyrosine Kinase vs JAK/STAT
Growth Factors bind RTKs; JAK/STAT bound by Cytokines, Growth Hormone, Prolactin, IL-2, EPO
Microscopy of Membranous Glomerulopathy
LM - Mesangial proliferation; IF - Ig and C3; EM - Spike and Dome
T-ALL is most likely to present
Anterior Mediastinal mass that compresses great vessels and esophagus
EKG progression of Acute Transmural Infarct
Peaked T waves –> STE –> Q waves
Imaging in Gallstone Ileus shows
Intestinal gas (obstruction), Air in biliary tree
Boerhaave Syndrome
Transmural tear (vs Mallory Weiss which is mucosal)
Cricopharyngeal motor dysfunction occurs due to
Diminished relaxatin of pharyngeal muscles during swallowing
Renal consequences of Ethylene Glycol ingestion
Oxalate crystals, Tubular epithelial damage (ballooning and vacuolar degeneration mostly in PCT)
FA vs Glucose oxidation in ATP generation and O2 use
FA oxidation produces more ATP, but uses more O2 per ATP
Receptor mediating Mydriasis
Alpha 1
Receptor mediating uterine relaxation
Beta 2 (tocolysis = Terbutaline, Ritodrine)
Mom and infant sequelae of rubella
Mom = Polyarthritis/Polyarthralgia; Infant = Sensorineural deafness, Cataracts, Cardiac malformations (PDA)
Intracellular pyrophophate granules in a bug
C diph (methylene blue staining)
Conus Medullaris Syndrome
L2 lesion = Flaccid paralysis of bladder and rectum, impotence, saddle anesthesia
Cauda Equina Syndrome
Radiating back pain, Saddle anesthesia, Loss of anocutaneous reflex, Bowel and bladder dysfunction, Loss of ankle-jerk reflex w/ plantar flexion weakness