(1_3) Neurology in 1 week Flashcards
Types of Stroke
“Types of Stroke
Stroke ““H-I-T”” you!
H-Hemorrhagic
I-Ischemic
T-TIA (Transient Ischemia Attack)
T.I.A (Transient Ischemic attack)
Patients often describe it as a shade being pulled over their eyes: S-H-A-D-E-D
S-Sensory loss; TIA may herald a stroke
H-Hypertension, Hyperlipidemia
A-Amaurosis fugax (transient monocular blindness)
D-DDx: seizures, neoplasms, migraine, vertigo
E-Extrinsic factor is monitored for warfarin administration; E-Endarterectomy
D-Diabetes”
Neurology Overview Map
”
“
CCS: Stroke
Imaging:
- CT w/o contrast (MRI/MRA later if etiology not known)
- EKG (Holter monitor if the EKG is normal: Warfarin, dabigatran, or rivaroxaban for atrial fibrillation)
- TEE: Anticoagulation for clots, possible surgery for valve vegetations
- Carotid Dopplers/Duplex: Endarterectomy for stenosis > 70%, but not if it is 100%
Labs:
glucose stat, Hb-A1C, fasting lipids
CBC, BMP
PT/PTT/INR
if <50 y/o
-ESR, VDRL/RPR ANA/DS-DNA Protein C, protein S, factor V Leiden mutation, antiphospholipid syndromes
Control HTN (if pt has DM <140/90), DM, HLD (LDL<100, statin for nonhemorrhagic stroke)
TX:
Ischemic: tPA (if w/in 3 hr), ASA, Statin
Hemohhragic: ASA, NPO, elevate the head of the bed, Tx incr ICP (hyperventilation, mannitol, steroids) ICU admit, cardiac/BP monitor, BP:
Hemorrhagic: keep BP <160
Ischemic getting TPA: BP < 185/110
Ischemic no TPA: BP > 160/80
Acute ischemic: ASA, if already on ASA add dipyridamole or change to clopidogrel
What is TIA?
1) Transient ischemic attack.
2) last <24 hours; it can never be hemorrhagic
What is stroke?
1) >24h with permanent deficit
2) 80% is ischemic (emboli vs thrombosis) and 20% is hemorrhagic
CCS: Transient Ischemic Attack
Physical Exam:
General, Skin, HEENT, Chest, Heart, Abdomen, Extremities, Neuro
Orders:
Imaging:
Head CT, ECG, Carotid Doppler
Neuro checks every 2 hours
Labs:
CBC, BMP, PT/PTT, Troponin, Lipid profile
Clock Advance clock to results.
Location Change to the inpatient unit.
Orders
Meds: Aspirin/Clopidogrel/Dipyridamole
Procedure: Carotid angiography
Clock Advance to results.
Orders
Carotid endarterectomy (if >70% stenosis), Consult neurology
Consult vascular surgery
Clock Advance to additional results and case end.
End Orders None
Lab Tests to Consider for CCS cases
Lab Tests to Consider for CCS cases
*CBC, BMP, and UA is warranted for all patients
*BOUPI
- Blood: CBC, BMP, LFT, Lipid Panel, PT/INR, PTT, Cultures (for fevers/infection); Type and Screen, Crossmatch
- Other: EKG, PEFR, Pulse Ox
- Urine: UA/UC, Urine Tox
- Pregnancy: urine BHCG
- Imaging
What are the main features of anterior cerebral artery stroke?
“1) profound lower extremity weakness (upper is mild)
2) urinary incontinence
3) Personality changes
ACA=(LIP)
Anterior cerebral artery (A*C*A) occlusion:
*C*-Contralateral Crural (leg) monoplegia
*C*-Crest of Cerebral hemispheres and medial hemispheric walls represent the leg area of the motor strip
“
What are the main features of middle cerebral artery stroke?
“1) Aphasia, Apraxia (neglect), profound Arm impairment
2) Eyes deviate towards the lesion
MCA= AE
Middle cerebral artery (MCA) occlusion: ““Difficulty with A-B-Cs in M-C-A””
A-Apraxia
B-Blindness in corresponding half of the visual field (contralateral homonymous hemianopsia)
C-Contralateral Clumsiness of arm, face. – Leg is somewhat spared.
M-Memorization difficulties
C-Calculation difficulties
A-Aphasia with language-dominant hemispheral involvement.
“
What are the main features of posterior cerebral artery stroke?
“1) Prosopagnosia (can’t recognize faces)
2) Contralateral homonymous hemianopia with macular sparing
PCA=PC
Posterior cerebral artery (PCA) occlusion: P-O-S-T
P-Proximal fling movements
O-Occipital lobe infarction results in contralateral homonymous hemianopsia which may be complete
S-Speech and Spelling maintained, but unable to read fluently
T-Thalamic syndrome
“
What are the main features of vertebrobasilar artery system stroke?
Vertical nystagmus, Vertigo, vomiting,
Drop attacks, dysarthria
Walking problems (ataxia)
Sensory changes of the face
VBAS=VDAS
A well-known mnemonic regarding occlusion of the vertebral-basilar circulation: 4D
- Dizziness
- Diplopia
- Dysarthria
- Dysphagia
What are the main features of lacunar infarct?
“Sensory deficit and hemiparesis
Absence of cortical deficit
Ataxia
Basal ganglia signs e.g. Parkinsonism
Lacunar infarct=SAAB
Lacunar infarct: ““Lacunar”” from the Latin for G-A-P or- D-I-S-P-A-R-I-T-Y
G-deep Gray matter: basal ganglia
A-Atherosclerosis
P-hyPertension
D-Dysarthria and a contralateral clumsy hand or arm due to infarction in the base of the pons or in the genu
of the internal capsule. (20%)
I-Internal Capsule: Lacunae in the posterior limb of the Internal capsule may cause pure motor hemiplegia
involving the face, arm, leg, foot. (60%)
S-Subcortical, capsular, or thalamic lacunae
P-Pontine lesions
A-Ataxic hemiparesis due to an infarct in the base of the pons
R-Rare: Lacunae in the anterior limb of the Internal capsule may cause severe dysarthria with facial weakness.
I-Ipsilateral ataxia (arm/leg) with leg weakness: Pontine lesion (rare)
T-Thalamus: Lacunae in the Thalamus may cause pure sensory stroke (10%)
y-V-Ventrolateral Thalamic lacunae”
What are the differences between MRI and CT in stroke?
1) MRI >95% accurate in 24h,
2) CT >95% accurate in 3-5 days
What is the window period for tPA in stroke?
3 hours
What are the contraindications for tPA?
1)
Previous hemorrhagic stroke
Stroke within one year
Bleeding disorders
Suspicious aortic dissection
2)
3 weeks: Traumatic CPR in the last 3 weeks
6 weeks: surgery or active bleeding in the last 6 weeks
6 months: cerebral trauma in the last 6 months
3)
cerebral mass or neoplasm
Types of Neuro-Vascular diseases
Vascular (3)
1) Stroke (Ischemic VS Hemorrhagic) & TIA
2) Arterial lesions
- ACA, MCA, PCA
- Lacunar infarct, Vertebrobasilar artery syndrome
- Ophthalmic artery (Amarousis Fugax)
3) Head trauma & Intracranial Hemorrhage
- Concussion VS Contusion
- Hematoma (Epidural VS Subdural)
- Stress Ulcer Prophylaxis
- Subarachnoid hemorrhage
What test should be ordered for stroke?
1) EKG, Holter’s monitor if EKG is normal
2) Echocardiography
3) Carotid artery Doppler
4) if <50 do:
- ESR
- VDRL, RPR
- ANA, anti- DS DNA, antiphospholipid antibody
- Protein C,S, factor V Leiden
Describe Antiphospholipid syndrome
- Autoimmune, hypercoagulable state caused by antiphospholipid antibodies.
- APS provokes blood clots (thrombosis) in both arteries and veins as well as pregnancy-related complications such as miscarriage, stillbirth, preterm delivery, and severe preeclampsia.
- The diagnostic criteria require one clinical event, i.e. thrombosis or pregnancy complication, and two antibody blood tests spaced at least three months apart that confirm the presence of either lupus anticoagulant, or anti-β2-glycoprotein-I (β2-glycoprotein-I antibodies are a subset of anti-cardiolipin Ab)
Tx for Antiphospholipid syndrome
- treated by giving aspirin to inhibit platelet activation, and/or warfarin as an anticoagulant.
- The goal of the prophylactic treatment with warfarin is to maintain the patient’s INR between 2.0 and 3.0. It is not usually done in patients who have had no thrombotic symptoms.
- Anticoagulation appears to prevent miscarriage in pregnant women. In pregnancy, low molecular weight heparin and low-dose aspirin are used instead of warfarin because of warfarin’s teratogenicity. Women with recurrent miscarriage are often advised to take aspirin and to start low molecular weight heparin treatment after missing a menstrual cycle. In refractory cases plasmapheresis may be used
