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What happens to blood on MRI as time progresses?
- 24hrs - T1 Hypo T2 Hyper
- 1-3 days - T1 Hypo T2 Hypo
- <7days - T1 Hyper T2 Hypo
- <14days - T1 hyper T2 Hyper
- >14days - T1 Hypo T2 Hypo
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Whats the callosal angle measurement for NPH?
Less than 90 degrees
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Whats the midbrain to pons ratio for PSP?
<0.52 with the widest part of the midbrain measuring <9.35mm
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Pigmented neurons with abnormal purplish inclusions?
Lewy bodies
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Classic EEG pattern of REM sleep?
Sawtooth pattern
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What are the sensitive and specific MR findings for Intracranial hypotension?
- Mammilo pontine distance ≤5.5mm
- Pontomesencephalic angle ≤50 degrees
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Positive sharp waves (PSWs) and fibrillation potential happen in?
Denervation
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Early recruitment happens in?
Myopathic problems
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What is the order of EMG changes following nerve transection?
- The earliest EMG manifestation of a neurogenic lesion is reduced recruitment, which occurs as soon as conduction along the axon fails.
- Several weeks after the injury, if wallerian degeneration occurred, abnormal insertional activity, including fibrillation potentials, will be evident.
- Later, as surviving axons sprout collaterals to supply denervated muscle fibers, motor unit prolongation and polyphasia will appear
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For SSEPs, what are the latency numbers for various anatomical structure?
- Erbs - 9
- Cervical cord - 13
- Brain stem - 14
- Cerecral cortex - 20
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Arch like waves on EEG that meet in the middle?
Mu waves - resting normal activity which is suppressed by motor activity.
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EMG findings of radiculopathy?
- Low amplitude motor response
- Normal sensory respone
- Prolonged F-wave
- No conduction block or distal motor latency prolongation
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