Uworld review 6 Flashcards
What are the effects of thyrotoxicosis on the cardiovascular system?
- Wide pulse pressure
- Arrhythmias
- Increased inotropy and chronotropy
How does thyrotoxicosis lead to increased sympathetic s/sx?
- Upregulates adrenergic receptors
- does NOT increase catecholamine synthesis
What are the characteristics of condyloma latum?
Flattened pink or gray velvety papules on mucous membranes
What is the best medication for the initial treatment of polymyositis?
Corticosteroids
What can polymyositis be a secondary symptom of?
CA
What is dacryocystitis, and what are the presenting features of it?
- Infection of the lacrimal sac in the medial aspect of the eye.
- Sudden onset of pain and redness in the medial canthal region, with purulent discharged noted from the punctum
What are the usual pathogens that cause dacryocystitis, and what is the treatment?
- Staph aureus
- Strep
- Systemic Abx
What is the technical definition of orbital cellulitis?
Infection posterior to the orbital septum
What are the s/sx of orbital cellulitis, beside the rash?
- Abrupt fever
- proptosis
- Restriction of EOMs
- Edematous, erythematous eyelids
What is a chalazion? How does it present?
- Chronic, granulomatous inflammation of the meibomian gland
- Painless, lid nodule, with minor lid discomfort
What is a hordeolum?
-Staph/strep abscess over the eyelid
What is episcleritis, and how does it present?
- Infection of the episcleral tissue between the conjunctiva and sclera.
- Acute onset of pain, photophobia, and watery d/c
What is the most common inheritance pattern of HOCM?
AD
What is the MOA and use of chlorpheniramine?
ANtihistamine for relief of allergy symptoms
Muscle weakness + purple papules on the hands = ?
Dermatomyositis
Which affects the ANS: dermatomyositis/polymyositis, or eaton-lambert syndrome?
Eaton-lambert
Which affects reflexes: dermatomyositis/polymyositis, or eaton-lambert syndrome
Eaton-lambert
What is the most sensitive test to screen for diabetic nephropathy?
Random urine microalbumin/Cr ratio
How can you differentiate between tricuspid endocarditis vs perivalvular abscess?
- endocarditis causes a systolic murmur (tricuspid regurg), and very rarely has conduction defects
- Perivalvular abscesses produce diastolic murmurs (aortic regurg), and commonly have conduction defects
When is the murmur associated with Aortic regurg best heard over the right and left sternal border respectively?
Right = aortic root disease Left = Valvular disease
What is the classic triad of Felty syndrome?
- Inflammatory arthritis
- Splenomegaly
- Neutropenia
In whom is Felty syndrome common in?
Pts with RA
What are the extra articular manifestations of Felty syndrome?
- Skin ulcerations
- Vasculitis
What is type I and II of heparin induced thrombocytopenia (HIT)?
I = nonimmune direct effect of heparin on platelet activation II= antibodies form to platelet factor 4, complexed with heparin
How long doe HIT usually take to manifest?
5-10 days
When is the osmolar gap useful?
If ethanol, methanol, or ethylene glycol toxicity is suspected
What is the use of a urine anion gap?
Helps determine if a normal anion gap acidosis is d/t the renal on intestinal bicarb losses. Renal loss occur with bicarb loss
What is the basic workup of HTN to r/o obvious other causes? (4)
- EKG
- UA
- CMP
- Lipid panel
When is a renal US done in the workup of HTN?
If creatinine is elevated or abnormal UA
What is the first step in the workup of a possible malignant pleural effusion?
Thoracentesis
What type of pleural effusion are malignant pleural effusions (exudative vs transudative)?
Exudative
What are the advantages of thoracentesis vs bronchoscopy in the workup of a pleural effusion?
Thoracentesis is done at the bedside, and does not require sedation
True or false: presbycusis can present with tinnitus
True
Rhomboid crystals are characteristic of gout or pseudogout?
Pseudogout
What are the other articular manifestations of pseudogout?
Chondrocalcinosis
What are the characteristics of the effusion with pseudogout?
Inflammatory: 15-30 cells/mm^3
True or false: Heberden nodes are associated with pseudogout
False
What are the shapes of the crystals in gout and pseudogout respectively?
Gout = needles Pseudogout = rhomboid
What causes parotid gland enlargement with alcoholic liver cirrhosis?
Alcohol use causes fat deposition. Liver cirrhosis not directly related.
True or false: all patients with liver cirrhosis should undergo screening endoscopy
True
What is the prophylaxis for esophageal varices 2/2 alcoholic liver cirrhosis? (2)
Banding or nonselective beta blockers (e.g. nadolol)
How do beta blockers prevent esophageal variceal rupture?
Reduce portal venous pressure by blocking the adrenergic vasodilatory response of the mesenteric arterioles, and leaving only alpha vasoconstriction, lower blood flow through the varices
What is the formula for the alveolar gas equation on RA under normal circumstances?
150 - (PaCO2)/0.8
What sort of hepatic abscess classically can cause anaphylaxis?
Echinococcal cysts
What type of neck tumor produces calcitonin? Why?
Medullary thyroid CA
Hyperplasia of the parafollicular C cells
What are the cells in the thyroid that produce calcitonin?
Parafollicular C cells
What are the classic symptoms of secretory diarrhea?
Watery diarrhea that wakes pt up
What is the stool osmotic gap, and what is its use?
-difference between plasma osmolality (= to stool osmolarity) and double the sum of Na and K ions in stool (= to stool osmolality)
What happens to the stool osmotic gap with secretory diarrhea?
Secretory diarrhea is due to increased secretions of ions. Thus the difference between plasma osmolality and measured fecal Na and K is significantly reduced
What happens to the stool osmotic gap with osmotic diarrhea?
Non Absorbed and unmeasured osmotically active agents are present in the GI tract. These ions result in an elevated osmotic gap (over 125)
Postsurgical changes the the bowel classically result in what sort of diarrhea (secretory or osmotic)?
Secretory
What are the ALT, AST, and alk phos levels with Dubin Johnson and Rotor’s syndrome?
All normal
How can you differentiate between thyrotoxic myopathy vs polymyositis?
Thyrotoxic will have systemic s/sx, and may have exaggerated DTRs (although usually not)
Are gout crystals positively or negatively birefringent? What does this mean?
Negative (yellow in parallel light, blue to orthogonal)
What are the Ca and phosphorus levels with secondary hyperPTH 2/2 CKD?
Low to normal Ca
Low Phosphorus
What are the PTH levels with hypercalcemia of malignancy?
Low
What is the first step in working up Cushing’s syndrome? (3)
One of the following:
- Overnight low-dose dexamethasone suppression test
- Salivary cortisol assay
- 24 hour free cortisol measurement
Once a diagnosis of hypercortisolism is established, what is the next step in the workup?
ACTH levels
What is the role of early morning cortisol levels?
Low utility in the evaluation of hypercortisolism
What are the morphologic characteristics of nocardia? What is the classic presentation for this infection?
- Gram positive, partially acid-fast rods that form filamentous structures
- Pneumonia in a immunocompromised pt (e.g. kidney transplant)
What is the treatment for nocardia?
TMP-SMX
What are the CXR findings of a pt with nocardiosis?
Nodular or cavitating lesions
What are the classic s/sx for a bony met to the spine?
- unrelenting back pain that is not relieved by rest.
- Worse at night
- Point TTP
How can you differentiate between a fat embolism and anaphylaxis?
Fat embolism has a petechial rash
Anaphylaxis has erythematous wheals and urticaria
Fat emboli also take 12-24 hours to manifest
How long do fat emboli take to manifest?
12-24 hours
What is the percentage of 1, 2, and 3 SDs?
1 = 68% 2 = 95% 3 = 99.7%
A stable lung lesion over how many years is considered benign, and indicates no further testing?
2-3 years
If a pt has a newfound lesion on CXR with no prior to compare to, what is the next step?
chest CT
What is the follow up for a lung nodule that has benign features on CT? Intermediate? Malignant?
Benign = serial CTs Intermediate = bx or PET Malignant = surgery
Why can some pts with SLE have pancytopenia?
Autoimmune peripheral destruction
Why is bone marrow bx frequently done with SLE?
since pancytopenia can occur, done to r/o other malignancies
What is the treatment for syphilis in a pt with a PCN allergy? What if they’re pregnant?
- Doxycycline
- PCN desensitization if prego
What are the indications for PCN desentization for the treatment of syphilis in a pt with a PCN allergy?
- Pregnant
- have neurosyphilis
How do Lewy bodies appear on histologic examination/.
Eosinophilic intracytoplasmic inclusions
What is the reversal agent for TCA overdose? How does this work?
Bicarb
Alleviates the inhibitory action of TCAs on fast Na channels of the myocardium
QRS interval increase of what is an indication for bicarb?
Over 100 msec
What causes seizures with TCA overdose? What does this mean in terms of treating seizures?
Inhibition of GABA receptors
So benzos preferred over Na channel blockers
What is the treatment for acute graft rejection?
IV steroids
What is a common adverse effect of cyclosporine in the early days of a transplant? What is the treatment?
- -Drug is nephrotoxic, and can damage kidney, leading to oliguria, HTN etc.
- Decrease dose after r/o acute rejection*
What is the correction for Na with hyperglycemia?
For every 100 mg/dL of glucose over 100, there is a loss of 2 mEq/L of Na. Thus real Na = measured Na +
(measured glucose -100)/*2/100
What is the management for symptomatic PACs?
Beta blockers