Surgery Part 3 and ObGyn Part 1 (202-233) Flashcards
Bleeding of middle meningial artery. Dx? CT?
Epidural - biconcave disk not crossing suture lines
Bleeding of cortical bridging veins. Dx? CT?
Subdural - crescenteric pattern extends across suture lines
Bleeding from Circle of Willis often at middle cerebral artery branch. Dx? Biggest cause and Sx?
Subarachnoid hemorrhage - Caused by berry aneurysm –> severe HA and CN III palsy
What does the CSF fluid of a pt with subarachnoid hemorrhage look like? Color? content?
Xanthochromia – CSF protein >150
What pharmacologic agent do you give pts with subarachnoid hemorrhage? WHy?
Nimodipine to prevent vasospasm that could result in secondary infarct.
Bleeding from basal ganglia, internal capsule and thalamus. Dx? CT/MRI shows?
Parenchymal hemorrhage - CT shows focal edema and hypodensity
What could be some causes of parenchymal bleed?
hypertension, trauama, AV malformation and coagulopathy
What is the most common temporal bone fracture?
Longitudinal fracture (80%)
After temporal bone fracture, if a CSF leak is noted, what should you do?
IV antibiotics and ear drops
If a temporal fracture affects the facial nerve, what should you do?
Facial nerve decompression
What are the 4 ( or 5) classic signs of a basilar skull fracture?
raccoon eyes, Battle’s sign, hemotypmpanum, CSF rhinorrhea and otorrhea
Dark circles (bruising) under the eyes is what?
Raccoon eyes
What is Battle’s sign?
ecchymosis over the mastoid process indicating fracture.
What is the treatment for a basilar skull fracture?
Supportive- HOB elevated, monitor ICP
Pt with increased ICP, bradycardia with hypotension, Cheyne-Stokes respirations, and papilledema. What general dx?
Tumors
Small circular lesion, often multiple at gray-white junction
metastatic
Large irregular ring enhancing lesion due to central infarction (outgrows blood supply) – most common primary CNS neoplasm
Glioblastoma multiforme
Second mC neoplasm, slow growing and bengin
Meningioma
Occurs in children (often bilateral) 60:40 sporadic:familial
Retinoblastoma
Found in cerebellum in the floor of the 4th ventricle, common in children
medullablastoma
compresses optic chiasm and hypothalamus
craniopharyngeoma
Sx: bilateral gynecomastia, amenorrhea, galactorhhea and bitemporal hemianopsia
prolactinoma
MC tumor in AIDS pt (100x incidence) – what does CT look like?
lymphoma - ring enhancing lesion
Usually affects CN VIII (acoustic neuroma)
Schwannoma
You excise all brain tumors except which two?
prolactinoma and lymphoma
Whats the tx for a prolactinoma?
Bromocriptine (D2 agonist)
Whats the tx for a lymphoma?
Radiation therapy
Dilated ventricles on CT/MRI with normal ICP. Dx?
Communicating hydrocephalus (either ex vacuo or normal pressure)
Why does hydrocephaleus ex vacuo happen? Tx?
Occurs after neuron loss - stroke, CNS dz.
No treatment
Why does normal pressure hydrocephaleus happen? Sx? Tx?
Causes: idiopathic, meningitis, cerebral hemorrhage,trauma, arthrosclerosis.
Sx: wet whacky wobbly
Tx: diuretic, repeated spinal taps and consider shunt placement.
What kind of hydrocephalus is associated with increased ICP?
Communicating or non communicating
Communicating spontaneous increased ICP commonly seen in obese young females, but can be idiopathic. Also can be caused by massive quntaties of Vitamin A. Dx? CT?
Pseudotumor cerebri
CT –> no ventricle dilation (may even be shrunken)
How to Tx pseudotumor cerebri?
acetazolamide or surgical lumboperitoneal shunt
Where is a non communicating hydrocephalus obstructed?
CSF outflow is at the 4th ventricle at the foramina
What could be the causes of noncommunicating hydrocephalus?
- Congenital (Arnold Chiari syndrome)
- tumor
- Scarring secondary to meningitis
- secondary to subarachnoid hemorrhage
Define aneurysm
Abnormal dilation of an artery to more than twice it’s normal diameter
What is the Most common cause of an aneurysm?
arthrosclerosis
What’s the difference between a true and false aneurysm?
True involves with all 3 layers of the vessel wall
False aneurysms are pulsatile hematomas covered only by a thickened fiberous capsule (adventitia)
Pt with classic abdominal pain, pulsatile abdominal mass, hypotension. Dx?
Rupture of AAA
What is the rate of rupture for a 5cm AAA rupture?
6% per year
What is the rate of rupture for a 6cm AAA rupture?
10% per year
What is the most difinitive diagnosis of a AAA?
Aortogram
Why are CTs done for AAA?
to determine the size of the aneurysm in a stable pt
When is surgical intervention for a stable AAA recommended?
infrarenal and juxtrarenal aneurysms >5.5
What complication can be seen in patients who have had synthetic grafts placed for AAA disease who have GI bleeding?
formation of a aortoduodenal fistula
Where is the most common peripheral aneurysm?
popliteal artery
What percent of the peripheral aneurysms are bilateral?
50%
with 33% of pts with popliteal aneurysms have a AAA
Where is a type A dissection located?
ascending aorta
Where is a type B dissection located?
both ascending and descending aorta
Pt presents with classic severe tearing (ripping) chest pain in hypertensive pts that radiates toward the back
Aortic dissection
Why does peripheral vascular dz happen?
arthrosclerosis dz in the lower extremeties
What are the factors associated with peripheral vascular disease?
smoking
increased homocystiene
elevated levels of C-reactive protein
What happens when cellulitis superimposes active infection to necrotic tissue?
wet gangrene
What is Leriche Syndrome?
Aortoiliac disease that causes claudication in hip and gluteal muscles, impotence
What is the ankle brachial index?
Ratio of BP in the ankle to the BP in the arm.
What is a normal ABI?
Greater than 1
What is an ABI with severe occlusive disease?
What is an ABI in a pt with claudication?
What is a normal waveform in an artery?
triphasic
Moderate occlusive disease waveform?
biphasic
severe disease waveform?
monophasic
What kind of lifestyle modifications can be suggested to pt with PVD?
smoking cessation and increase exercise
What is the pharmacologic intervention for PVD? (first and second line)
Cilostazol (vasodilator and platelet inhibitory properties)- first
Pentoxifyllin - second
What is minimally invasive therapy for PVD?
percutaneous balloon angioplasty and/or arthrectomy + endoluminal stents
What are indications for PVD surgery?
rest pain, tissue necrosis, non healing infection and intractable claudication
Dilated prominent tortuous superficial veins in the lower limbs
varicose veins
What kinds of people get varicose veins? (2) Why?
- pregnancy (progesterone causes dilation of veins)
- prolonged standing professions
- possible inheritance
Why do venous ulcers occur?
Seconday to venous hypertension, DVT, varicose veins –> usually located on the medial calf or ankle
Are venous ulcers painful or painless?
painless?
What is phelgmasia alba dolens?Tx?
milk leg –> venous thrombosis usually occuring in post partum women
Tx: heparin and elevation
What is phlegmasia cerula dolens? Tx?
venous gangrene –> venous thrombosis with complete obstruction of arterial inflow
Tx: heparin, elevation and venous thrombectomy if unresolved
What are unna’s boots?
zinc oxide paste impregnated bandage used to reduce swelling
Why do arterial ulcers occur?
secondary to occlusive arterial disease
Are arterial ulcers painful or painless
painful in contrast to venous ulcers
Where are arthrosclerotic plaques most often seen in carotids?
most commonly the carotid bifurcation
What is the indication for carotid endarterectomy in symptomatic patients?
stenosis > 70%
multiple TIAs
Pts with Hx of CVA, amenable to surgery
What is the indication for carotid endarterectomy in asymptomatic patients?
carotid steonosis >75%
What dz is caused by an occlusive lesion in subclavian arteria or innominate artery that causes decreased blood flow distal to the obstruction?
Subclavian steal syndrome
Where does subclavian artery “steal” blood from?
vertebral artery via retrograde flow
What is the tx for subclavian steal syndrome?
Carotid-subclavian bypass
What causes renovascular hypertension?
Renal artery stenosis and subsequent activation of the renin-angiotensin pathway
What causes renal artery stenosis to begin with?
Arthrosclerotic lesions… but can be secondary to fibromuscular dysplasia, subintimal dissections and hypoplasia of the renal artery
What’s the initial test you would do to test for renal artery stenosis? Gold standard?
renal duplex ultrasound and gold standard is angiography
Can also do renin:vein renin ratio (captopril test)
Define chronic intestinal ischemia
secondary to arthrosclerotic lesions of atleast 2 of the 3 major vessels supplying the bowel.