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STEP 1
Missed Questions
76
Medical
Professional
02/23/2012

Additional Medical Flashcards

 


 

Cards

Term
Flucytosine mechanism
Definition
Inhibits DNA synthesis by conversion of 5-fluorouracil by cytosine deaminase
Term
Flucytosine Side Effects
Definition
N/V, Diarrhea, Bone marrow suppresion
Term
Flucytosine Clinical Uses
Definition
Systemic fungal infections (crypto) in combo with Amphotericin B
Term
Amphotericin B Side effects
Definition
-Need to supplement K and Mg b/c of altered renal tubule permeability.
-Can cause fever,chills, hypotension, nephrotoxicity, arrhythmias, anemia, IV phlebitis, N/V
Term
Anterior Circulation of Brain and Derivation
Definition
-ACA, Lateral Striate, and MCA
-Derived from internal carotid
Term
Posterior Circulation of Brain and Derivation
Definition
-Post. Circulation: Basilar, AISA, ASA, PICA, PCA, Vertebral
-Derived from subclavians
Term
ACUTE PANCREATITIS-presentation
Definition

Sudden onset of nausea/vomiting and epigastric abdominal pain. 

 

-Dilation of common bile duct may suggest gallstones

 

-May cause DIC

 

Term
DIC Lab Profile
Definition

Decreased platelet count

Increased BT, PT, and PTT

Term
What is/does CD14 do?
Definition
It is a TLR present on macrophages that recognizes LPS on gram - bac.  CD14 activation results in upregulation of NF-kB→ production of multiple immune mediators
Term
Meningioma-S/S
Definition
Headache, Visual field disturbances, seizures, micro:spindle cells in whorled pattern w/psammoma bodies
Term
Trypanasoma cruzi transmission
Definition
Reduviid Bug "kissing bug"
Term
T. Cruzi Treatment
Definition
Nifurtimox
Term
Drugs that act on Microtubules
Definition

1.Mebendazole/Thiabendazole(antihelminic)

2.Griseofulvan (antifungal)

3.Vincristine/vinblastine (anti-cancer-Hodgkin's/Non-Hodgkins)

4.Paclitaxel(anti-breast cancer)

5.Colchicine(anti-gout)

Term
Signs/Symptoms of Hypokalemia
Definition
U waves on ECG, flattened T waves, arrhythmias, paralysis
Term
Signs/Symptoms of Hyperkalemia
Definition
Peaked T waves, wide QRS, arrhythmias
Term
What is a common hematologic problem associated with CLL?
Definition
Warm antibody autoimmune hemolytic anemia
Term
What is sodium bicarbonate used for?
Definition
IV sodium bicarbonate is used for treating acidosis and hyperkalemia. Orally it is an alkalinizing agent or an antacid
Term
When is b-HCG detectable in the serum?
Definition
Around one week (generally about 8 days after ovulation but can take up to 11 days). Will detect at week2 in urine.
Term
Name the 3 important dopaminergic pathways
Definition
1.)Mesolimbic/mesocortical-regulates behavior (schizophrenia)
2.)Nigrostriatal-coordination of voluntary movement-Parkisonism
3.)Tuberoinfundibular-controls prolactin secretion from ant. pituitary- hyperprolactinemia
Term
What should you suspect if you see hyponatremia with a urine osm, > 100
Definition
SIADH
Term
What should you suspect if you see hyponatremia w/ urine osm < 100
Definition
Primary polydipsia (b/c body is responding appropriately by reabsorbing all the sodium it can).
Term
What are the drugs used to treat hypertension in asmatic patients (or patients with pulmonary disease)
Definition

A BEAM=

Acebutolol (partial agonist), Betaxolol, Esmolol (short acting), Atenolol, Metoprolol

-These drugs are selective antagonists for B1 (which B1 stim. normally causes increased heart rate and contractility) but don't have an effect on B2 

Term

What is mixed venous oxygen saturation?

 

Definition
It is a way of basically determining the oxygen demand and consumption in the periphery.  It is a direct measurement of the mixed venous blood in the right heart coming in from the Sup. vena cava, IVC, and the coronary circulation.  Said another way it is the percentage of reduced hemoglobin left after tissue oxygen extraction.  So in vigorous exercise....
Term

What is the first line treatment for P. jiroveci pneumonia?

What is second line if patient has an allergy to the first line treatment?

Definition

First line: TMP-SMX

Second line if allergic to sulfa drugs: pentamidine

Term
Name the three cephalosporins used to treat Pseudomonas infections?
Definition
Cefoperazone, ceftazidime, cefepime
Term
What is the mechanism of cephalosporins?
Definition
They are β-lactam antibiotics that inhibit bacterial cell wall synthesis and are more resistant to penicillinases.  They are bactericidal.
Term
Cephelosporins when combined with aminoglycosides can cause what adverse effects?
Definition
Anaphylaxis and nephrotoxicity
Term
What should be your differential for organisms causing long branching filaments?
Definition
N.asteroides, A.israelii, and fungi(and fungi probably wouldn't be evident on a gram stain).
Term
Treatment for Actinomyces vs. Nocardia and clinical presentations
Definition

SNAP= Sulfa drugs treat Nocardia, Actionomyces use Penicillin

 

A. israelii causes oral and facial abscesses vs. n.asteroides which causes pneumonia in immunocompromised patients

Term
What type of renal involvement/pattern is seen in Wegner's granulomatosis?
Definition
Segmental necrotizing glomerulonephritis(sometimes w/ crescents)
Term
What drug do you use to treat Legionella pneumonia and what are some of the features that make this pneumonia unique?
Definition
Azithromycin or erythromycin b/c legionella has a b-lactamase that makes it resistant to penicillin derivatives.  Legionella pneumonia presents with acute hyperpyrexia, severe pneumonia, non-productive cough, diarrhea, and hyponatremia and CNS problems (last two unique with this pneumonia)
Term
Pseudomonas characteristics
Definition
Aerobic, oxidase (+), gram (-) bacteria, non-lactose fermenting, producing pyocyanin and pyoverdin.  Produces exotoxin A which ADP ribosylates elongation factor 2 inhibiting host cell protein synthesis, and endotoxin(fever/shock)
Term
Name bacteria that produce exotoxins that lead to increased cAMP levels?
Definition
Cholera, E.Coli, B.pertussis, bacillus anthracis,
Term
Lab characteristics of Strep. pyogenes?
Definition

β hemolytic, gram (+), cat (-), bacitracin sensitive

 

Strep. throat is B.S.

B.S.= beta hemolytic, Bacitracin Sensitive

Term

What HIV drug should you give in HIV + pregnant women?

 

What are the S/S of HIV infection in a newborn?

Definition

Zidovudine(ZDV) is prescribed for prophylaxis during pregnancy to reduce risk of fetal transmission.ZDV is a reverse transcriptase inhibtor(toxicty:megaloblastic anemia)

 

-Oral thrush, interstitial pneumonia, severe lymphopenia in first year of life

Term

What stain is used to detect crypto in bronchoalveolar fluid?

 

What about CSF?

 

Definition

Mucicarmine-will stain yeast red

 

You can do a latex agglutination test in the CSF, stained with india ink

Term
Transplant patient...now has oportunistic infection...what is it?
Definition
CMV (enveloped, ds DNA), with intranuclear and cytoplasmic inclusions (Owl's eyes)-look at pg 184 in Step for good picture
Term
What drug is given to treat pulmonary hypertension and right ventricular hypertrophy and what is it's mechanism?
Definition
Bosentan-competitively antagonizes endothelin 1 receptors, decreasing pul. vascular resistance.  Endothelin 1 causes vasoconstriction and endothelial proliferation.
Term
What are the 5 hormones that can affect surfactant production?
Definition
cortisol, thyroxine,and prolactin-increased levels=more surfactant, low levels of any can lead to RDS. TGF-β, insulin higher levels=less surfactant
Term
What do you give premature infants that have risk factors for RSV infections?
Definition
Palivizumab- a monoclonal antibody against F protein (which is the fusion protein to resp. epithelial cells) prevents RSV inf./pneumonia.  Risk factors for RSV inf. are prematurity, resp. infections, congenital heart disease, and immunodeficiencies
Term

What are the 4 T's of Type IV hypersensitivty reactions?

 

Definition
4 T's are T-cell mediated, TB skin test (PPD), Transplant rejections, Touching (contact dermatitis)
Term

What is this?

[image]

Definition
Histoplasmosis-b/c it is a macrophage filled with numerous small ovoid bodies.
Term
What is unique about the M. pneumoniae cell membrane?
Definition
Only bacterial membrane containing cholesterol.
Term
What drugs are used to treat a mycoplasma pneumoniae infection?
Definition
Erythromycin or tetracycline
Term
What kind of pneumoniae does M. pneumoniae produce, who does it usually affect, and what are some of the sequelae?
Definition

"walking pneumonia"-insidious onset, headache, non-productive cough, diffuse interstitial infiltrates, x-ray looks worse than patient. 

-affects people in enclosed spaces such as in prisons or military barracks (usually in patients <30)

-Rare sequelae: Cold-agglutin anemia(↑IgM), Stevens Johnson Syndrome (very rare), and joint pain

Term
What are the treatment options for Tourette's?
Definition
First-line treatments are typical and atypical anti-psychotics like haloperidol and risperidone, respectively. Can also give clonadine but it shows variable efficacy compared to neuroleptics.
Term
What drug and state its mechanism is used for a benzo overdose?
Definition
Flumazenil which is a competitive antagonist at GABA benzo receptors.
Term
When administering flumazenil what should you be aware of?
Definition
Rebound seizures
Term
Lab profile for S. pyogenes?
Definition
Gram (+) cocci in chains, catalase (-), β hemolysis, Bacitracrin Sensitive
Term
What illnesses associated with Strep Pyogenes?
Definition
Pharyngitis, cellulitis, erysipelas, Rheumatic fever, post-streptococcal glomerulonephritis
Term
Lab profile for strep agalactiae?
Definition
Group B strep, gram + in chains, catalase (-), β hemolytic, bacitracin sensitive
Term
What illnesses does Strep. agalactiae cause?
Definition
Neonatal sepsis, neonatal meningitis, neonatal pneumonia
Term
What is the lab profile of enterococci faecalis and what does it cause?
Definition

Gram + cocci in chains(in Strep family), catalase (-), gamma hemolytic (i.e.-no hemolysis), and grows in bile AND 6.5% NaCl (i.e. saline).

 

-Causes endocarditis after genitourinary procedures

Term
What is the lab profile and what illness does Strep. bovis cause?
Definition

G positive cocci, cat. - gamma hemolytic (i.e. no hemolysis), group D strep, growth in bile but NOT 6.5% NaCl (saline).

 

-Causes endocarditis asscoiated with colonic malignacy

Term

Baroreceptors and responses:

 

The aortic arch transmits via what nerve and responds to what?

 

The carotid sinus transmits via what nerve and responds to what?

Definition

Aortic arch transmits via vagus nerve to medulla and responds only to ↑BP



Carotid sinus transmits via glossopharyngeal nerve to solitary nucleus of medulla and responds to ↑ or ↓ in BP

Term
What is dobutamine used for and what are it's effects?
Definition

Dobutamine is used for acute heart failure associated with decreased myocardial contractility (e.g. cardiogenic shock).

 

-Increases contractility and CO, weakly increases HR and myocardial O2 consumption(don't really want these effects but they are weak), and also increases cardiac conduction velocity which can result in arthymias.

Term
What drugs can cause a lupus like syndrome?
Definition
Procainamide, hydralazine, and isoniazid
Term
What is the only condition in which you should consider giving a child with a high fever aspirin?
Definition
Kawasaki's Disease
Term
What does a fixed and widely split S2 indicate?
Definition
Pathognomonic for an ASD
Term
What is one of the main signs of irreversible cell injury?
Definition
Mitochondrial vacuolization (membrane damage generally indicates irreversible injury)
Term
Is disaggregation of nuclear granules and clumping of nuclear chromatin a sign of reversible or irreversible injury?
Definition
REVERSIBLE
Term

When should you screen for GBS in gestation?

 

-In women who culture positive or have had previous children infected with GBS in the past what is the treatment?

Definition

GBS should occur at 35-37 weeks of gestation(vaginal and rectal cultures)

 

-Treatment of choice remains Penicillin given intrapartum. Ampicillin is an acceptable alternative (while birthing) 

Term
What effect do beta blockers have in the kidney?
Definition
Beta blockers inhibit the production and release of renin from renal juxtoglomerular cells through antagonism of B1 receptors on these cells.  This causes inhibition of the renin-angiotensin-aldosterone system.  Leads to ↓ vasoconstriction and ↓ Na and water retention 
Term
What does this pussy have?[image]
Definition
Coccidiodies Immits
Term
What kind of transmembrane protein is damaged in cystic fibrosis? (i.e. voltage gated, g-coupled, etc.)
Definition
Its a transmembrane ATP-gated chloride channel
Term
What two drugs are effective in decreasing the long-term mortality rate in patients with heart failure?
Definition
ACE Inhibitors and Beta blockers (particularly carvedilol)
Term

What organism is responsible for infective endocarditis in patients with indwelling catheters or previous valve replacement surgeries?

 

How is this infection treated?

Definition

S.epidermidis

 

Treated with vancomycin combined w/ rifampin or gentamicin or both (often resistant to methicllin)

Term

What is one of the bacterial genetic mechanisms that the SHiN bugs use?

 

 

Definition

S. pneumo, H. influ., Neisseria (SHiN) have the ability to take up DNA (chromosomal fragments) from the environment→this is known as competence or transformation.


-This is one way for the bacteria that don't have a capsule and are not pathogenic to get DNA that codes for a capsule and thus gain virulence.

Term
How does strep viridans adhere to valve leaflets?
Definition

It uses dextrans which are polysaccarides made by using sucrose as a substrate.  Dextrans can facilitate adherence ONLY to previously damaged valves that have fibrin and platelet depositions.

 

-In contrast S. aureus can attach to healthy valves

Term
If you have a patient with persistent cough and lung infiltrates and you draw blood and place in ice and it agglutinates what should you think of?
Definition
M. pneumoniae b/c it has IgM cold agglutins. (EBV also associated w/ cold agglutins).  Also can run agglutin titers in serum if you suspect M.pneumoniae b/c will be increased in half of patients and will not see this in viral or atypical pneumonias.
Term
Temporal Arteritis is associated with what other condition?
Definition
Polymyalgia Rheumatica (pain in shoulder and hips often with fever and weight loss)
Term
The 6th aortic arch gives rise to what structure?
Definition

Proximal part of pulmonary arteries and pulmonary to systemic shunt (ductus arteriosus-on left only).

 

Monic: just think of 6 looking like an upside down P so just flip it over make the P for Pulmonary arteries and Pul. to systemic shunt (ductus arteriosus).

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