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18 Cards in this Set
- Front
- Back
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What is the formula for sensitivity?
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TP/(TP + FN)
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What is the formula for specificity?
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TN/(TN+FP)
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How is negative predictive value related to prevalence?
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Inversely related to the prevalence of the disease?
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What is the formula for PPV?
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TP/(TP+FP)
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Name 13 reasons to obtain neuroimaging in a patient with headache.
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1. first or worst headache
2. subacute progressive 3. CDH 4. NDPH 5. headache and seizure 6. headache and focal neurologic sx (migraine with aura) 7. abnormal neuro exam (increased rate of abnL MRI by 42!) 8. patient with HIV or history of cancer 9. patients over 50 10. papilledema, cognitive declline, personality change and headache 11. not responsive to treatment 12. always unilateral without side shifting 13. headache assoc. with fever, stiff neck |
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What are the 5 criteria for Hemicrania Continua?
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1. Headache more than 3 months
2. daily without pain free period 3. unilateral without side shifting 4. autonomic sx of rhinorrhea, nasal congestion, miosis, ptosis, 5. completely responsive to indomethacin misdx as migrained because can have n/v/photophobia/phonophobia |
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How many rads are in a CT scan during pregancy with lead protection?
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1 mrad
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How many rads are studied to harm fetus?
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50 rads
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What are guidelines for imaging in pregnancy MRI and CT?
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MRI ok
gadolinium avoid if possible, if breastfeeding dispose X 24 h CT not ok iodinated contrast not ok |
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When is the child most susceptible to teratogenicity of radiation in utero?
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5 to 20 weeks
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What has been the studied dose of radiation that causes teratogenicity in children?
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5 to 15 rads
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What percentage of all comers with headache will have a symptomatic structural lesions found on imaging?
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1.2%
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What percentage of migraineurs will have abnL MR imaging?
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0.4 %
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What happens to the risk of finding abnormal MR imaging if headache + abnL neuro exam?
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increased by 42 times
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What is the prevalence of WM Abnormalities (so called UBOs) in migraines?
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studies range from 20-40%
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What is the usual duration for cluster headaches?
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at least 5 attacks lastin 15-180 minutes
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What is the usual duration for paroxsymal hemicrania?
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at least 20 attacks, lasting 2 to 30 minutes, usually at least 1/2 have more than 5 episodes per day
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What is the usual duration for SUNCT?
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at least 20 attacks lasting 5 to 240 seconds, sometimes up to hundreds per day
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