How to Think like a Neurologist Review of Exam Process and Assessment Findings
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1 Lehigh Valley Health Network LVHN Scholarly Works Neurology Update for the Non-Neurologist 2013 Neurology Update for the Non-Neurologist Feb 20th, 5:10 PM - 5:40 PM How to Think like a Neurologist Review of Exam Process and Assessment Findings Gary Clauser MD Lehigh Valley Health Network, gary.clauser@lvhn.org Follow this and additional works at: neurology_update_non_neurologist Part of the Analytical, Diagnostic and Therapeutic Techniques and Equipment Commons, Medical Education Commons, Neurology Commons, and the Neurosciences Commons Clauser, G. (2013). How to Think like a Neurologist Review of Exam Process and Assessment Findings. Neurology Update for the Non-Neurologist,. Retrieved from neurology_update_non_neurologist/2013/february_20/4 This Presentation is brought to you for free and open access by the Conferences and Symposia Collection at LVHN Scholarly Works. It has been accepted for inclusion in Neurology Update for the Non-Neurologist by an authorized administrator of LVHN Scholarly Works. For more information, please contact LibraryServices@lvhn.org.
2 How to Think Like a Neurologist Review of Exam Process and Assessment Findings Gary Clauser Lehigh Neurology Lehigh Valley Health Network
3 Objectives / Outline Review Common Neurological Cases Review Thought ( localization ) Process Simple determination of Central or Peripheral Allowing better disposition / work up
4 Pre-Quiz Tel-Con - 74yo female with known DM, hyperlipidemia. Awoke with new bilateral arm tingling. Seen in office in the afternoon. Now with numbness remaining in the left upper arm. CT head (done emergently) small vessel ischemic changes. WHAT SHOULD I DO NEXT?
5 Pre-Quiz Options 1) Admit for acute stroke 2) MRI brain and observe as outpatient 3) Observe as outpatient 4) Other options MRI cervical spine NCV/EMG Reassurrance
6 Case 1 A 74yo right handed female awakens with left arm heaviness
7 Diagnostic Process Symptoms/Signs Left arm heaviness Cause????
8 Diagnostic Process Phenomenology Left arm weakness Etiology????
9 Neurologic Diagnostic Process Where is the Lesion? Phenomenology Left Arm Weakness Lesion???? Etiology????
10 Localize the Lesion 1) Determine the subsystem involved 2) Determine likely localization based on the pattern and nature of deficits 3) Confirm and refine localization with other subsystems
11 Localize the Lesion Determine the subsystem involved Determine likely localization based on the pattern and nature of deficits Confirm and refine localization with other subsystems
12 Motor Pathway Face Arm Leg
13 Motor Pathway Face Arm Leg
14 Motor Pathway Face Arm Leg
15 Motor Pathway Face Arm Leg
16 Complaint of left arm heaviness Face Arm Leg
17 3.Cortical 1.Peripheral Possible Lesion Location?? 2.Spinal Cord Face Arm Leg
18 Localize the Lesion Determine the subsystem involved Determine likely localization based on the pattern and nature of deficits Confirm and refine localization with other subsystems
19 Examination
20 Exam CN Visual fields normal, left facial droop Motor - mild left arm weakness; mild left leg weakness; right side normal Sensation normal to light touch, no extinction or neglect
21 Exam: Left Facial Droop Left Arm Weakness Left Leg Weakness Face Arm Possible Lesion Location?? Leg
22 Exam: Left Facial Droop Left Arm Weakness Left Leg Weakness 3.Cortical 2.Spinal Cord Face 1.Peripheral Arm Possible Lesion Location?? Leg
23 Exam: Left Facial Droop Left Arm Weakness Left Leg Weakness 3.Cortical 2.Spinal Cord Face 1.Peripheral Arm Possible Lesion Location?? Leg
24 Exam: Left Facial Droop Left Arm Weakness Left Leg Weakness 3.Cortical 2.Spinal Cord Face 1.Peripheral Arm Possible Lesion Location?? Leg
25 Left Facial Droop Left Arm Weakness Left Leg Weakness Face Arm Leg
26 Case 1 Evaluation: 1) Where to image? 2) Differential of Etiologies
27 Recap 74yo RH female with acute onset of left sided face, arm, leg weakness Localized to Cerebral event Imaging CT head negative for bleed or mass (** without contrast = low sensitivity for mass)
28 Etiology?? Any Historical Clues?? Age 74yo female Tempo of Onset Acute ( awoke with symptoms )
29 Tempo of Onset Stroke Hemorrhage Trauma Tumor Demyelinating Hemorrhage Acute Onset Gradual Onset
30 Ischemic Event Cortical vs Subcortical Why important?? Aid in determining pathophysiology Cortical = embolic Subcortical = small vessel atherosclerosis
31 Cortical Localization Dominant Hem Non-Dominant Hem
32 Cortical Localization Dominant Hem Non-Dominant Hem Why Do Neurologists ask what hand dominance a patient is??????
33 Rule out Cortical Dominant vs Nondominant 95% rt handed people = left side Dom 85% left handed people = left side Dom Take home Point
34 Rule out Cortical Dominant Hem. Non-Dominant Hem.
35 Rule out Cortical Dominant Hem. Aphasia Naming Repeat Comprehension Reading/Writing Non-Dominant Hem.
36 Rule out Cortical Dominant Hem. Aphasia Naming Repeat Comprehension Reading/Writing Non-Dominant Hem. Neglect
37 Rule out Cortical Dominant Hem. Aphasia Naming Repeat Comprehension Reading/Writing Non-Dominant Hem. Neglect Extinction
38 Rule out Cortical Dominant Hem. Aphasia Naming Repeat Comprehension Reading/Writing Non-Dominant Hem. Neglect Extinction Touch on 2 sides ignores affected side
39 Rule out Cortical Dominant Hem. Aphasia Naming Repeat Comprehension Reading Writing Non-Dominant Hem. Neglect Extinction Touch on 2 sides ignores affected side Visual Fields Take Home Point
40 Other Cortical Clues Pattern Of Weakness Face = Arm = Leg (patient with normal cognition) Subcortical Face and Arm > Leg Middle Cerebral Artery (MCA) Cortical infarct Image(s) have been omitted Leg > Face and Arm Anterior Cerebral Artery (ACA) Cortical Infarct Take Home Point
41 Recap 74yo RH female with acute onset of left sided face, arm, leg weakness No Aphasia, No Neglect or Visual Field Cut Weakness appears equal Dx = Right Subcortical Stroke (Posterior Limb of Internal Capsule) Pathophysiology small vessel atherosclerosis
42 Age Factor Acute Cerebral Weakness Localization remains the same Causes will vary Teenager Adult Senior Trauma/Bleed Ischemia Multiple Sclerosis Bleed / Trauma Ischemia Tumor Multiple Sclerosis
43 Case 2 A 42 year-old teacher with a long history of mild recurrent low back pain complains of 8 days of progressive weakness and numbness of both legs.
44 Localize the Lesion Determine the subsystem involved Determine likely localization based on the pattern and nature of deficits Confirm and refine localization with other subsystems
45 Weakness and Numbness of Legs Face Arm Leg
46 Weakness and Numbness of Legs Face Arm pain Hx - Low Back Pain? Lumbar Spine Leg
47 Localize the Lesion Determine the subsystem involved Determine likely localization based on the pattern and nature of deficits Confirm and refine localization with other subsystems
48 Exam Significant weakness of proximal and distal leg muscles Mild weakness of distal arm muscles. There appears to be absent reflexes.
49 Face Arm Leg
50 3 Cortex: Bilateral Arms and Legs Face 2 Cervical Cord: Arm 1 Peripheral: Nerve / Nerve Root Muscle Leg
51 3 Cortex: Bilateral Arms and Legs Bilateral = Unable to be Cortical Face 2 Cervical Cord: Arm 1 Peripheral: Nerve / Nerve Root Muscle Leg
52 Face 2 Cervical Cord: UMN Arm 1 LMN Peripheral: Nerve / Nerve Root Muscle Leg
53 Face 2 Cervical Cord: UMN Exam Distal UE weak LE weak Absent reflexes Arm 1 LMN Peripheral: Nerve / Nerve Root Muscle Leg
54 UMN LMN Reflexes Hyper Hypo Tone Increased Decreased Atrophy Mild Severe
55 UMN LMN Reflexes Hyper Hypo Absent Tone Increased Decreased Normal Atrophy Mild Severe
56 UMN LMN Reflexes Hyper Hypo Absent Tone Increased Decreased Normal Atrophy Mild Severe
57 Major Lesion Categories Focal Unilateral Diffuse (Peripheral) Bilateral Asymmetric Symmetric Structural Toxic Metabolic Take Home Point
58 Major Lesion Categories Focal Unilateral Diffuse (Peripheral) Bilateral Asymmetric Symmetric Structural Toxic Metabolic Take Home Point
59 Face Arm Peripheral: Nerve / Nerve Root Muscle Leg
60 UMN Peripheral: Nerve / Nerve Root Muscle LMN NMJ Nerve Muscle
61 UMN Motor Unit LMN NMJ Nerve Diffuse Weakness: Muscle Neuro-muscular Junction Diffuse neuropathy Lower motor neuronopathy Upper motor neuronopathy Muscle
62 Localize the Lesion Determine the subsystem involved Determine likely localization based on the pattern and nature of deficits Confirm and refine localization with other subsystems
63 Recap A 42 year-old teacher with a long history of mild recurrent low back pain complains of 8 days of progressive weakness and numbness of both legs.
64 UMN Motor Unit LMN NMJ Nerve Diffuse Weakness: Polyradiculopathy Nerve Neuro-muscular Junction Muscle Muscle
65 UMN Motor Unit Weakness and Numbness LMN NMJ Nerve Diffuse Weakness: Nerve Neuro-muscular Junction Muscle Muscle
66 UMN Motor Unit Weakness and Numbness LMN NMJ Nerve Diffuse Weakness: Nerve Muscle
67 UMN Weakness & Numbness Motor Unit LMN NMJ Nerve Sensory Neuron Muscle
68 Neurologic Diagnostic Process Where is the Lesion? Phenomenology Diffuse Weakness & Numbness Lesion Diffuse neuropathy Etiology????
69 Neurologic Diagnostic Process Where is the Lesion? Phenomenology Diffuse Weakness Lesion Etiology Diffuse neuropathy AIDP (Guillain-Barre)
70 Major Lesion Categories Focal Diffuse Unilateral Bilateral Asymmetric Symmetric Structural Toxic Metabolic
71 Why not Cervical??? Face Cervical Cord: Arm Peripheral: Nerve / Nerve Root Muscle Leg
72 Why not Cervical??? Face Arm Leg
73 Face Arm UMN Lesions Reflexes?? Leg
74 Face Arm UMN Lesions Reflexes = Increased Leg
75 Case 3 A 26 year-old graduate student awoke yesterday with left arm weakness.
76 Localize the Lesion Determine the subsystem involved Determine likely localization based on the pattern and nature of deficits Confirm and refine localization with other subsystems
77 3 Cortex: Left arm weakness. Face 2 Spinal Cord - Cervical Cord: Arm 1 Peripheral Leg
78 Localize the Lesion Determine the subsystem involved Determine likely localization based on the pattern and nature of deficits Confirm and refine localization with other subsystems
79 Exam Strength = 4/5 in the Left Tricep, Wrist Extensors, remainder = normal. Reflexes = 2 in the upper extremities and 2+ in the lower extremities. Sensory = decreased pin prick in the lower extremities and truncal region.
80 Exam Strength = 4/5 in the Left Tricep, Wrist Extensors, remainder = normal. Reflexes = 2 in the upper extremities and 2+ in the lower extremities. Sensory = decreased pin prick in the lower extremities.
81 Exam Further Sensory Exam Testing of Trunk sensory revealed a sensory level in mid abdomen
82 UMN LMN Reflexes Hyper Hypo Tone Increased Decreased Atrophy Mild Severe
83 UMN LMN Reflexes Hyper Hypo Normal UE, Increased LE Tone Increased Decreased Normal Atrophy Mild Severe Normal
84 Major Lesion Categories Focal Diffuse Unilateral Bilateral Asymmetric Symmetric Structural Toxic Metabolic
85 Major Lesion Categories Focal Diffuse Unilateral Bilateral Asymmetric Symmetric Structural Toxic Metabolic
86 Major Lesion Categories Focal Diffuse Unilateral Bilateral Asymmetric Symmetric Structural Toxic Metabolic
87 Sensory Exam Decreased LE and truncal region
88 Sensory Exam Decreased LE and truncal region
89 Sensory Exam Decreased LE and truncal region
90 = sensory Face Arm Exam: Left UE weak Bilateral LE and Trunk Sensory Leg
91 3.Cortex Face Localization: Where to Image? 2. Spinal Cord ++ + Arm 1.Peripheral (LMN) +++ Leg
92 Face Localization: Where to Image? 2. Spinal Cord ++ + Arm 1.Peripheral (LMN) +++ Leg
93 Face Localization: Where to Image? ++ + Arm +++ Leg
94 Neurologic Diagnostic Process Where is the Lesion? Phenomenology Left Arm Weakness Lesion Cervical Cord Etiology??????
95 Neurologic Diagnostic Process Where is the Lesion? Phenomenology Left Arm Weakness Lesion Etiology Cervical Cord Transverse Myelitis
96 Case 4 65yo RH male started on Antibiotics for cough. Next morning awakens with dysarthria. He has a history of HTN, diet controlled Diabetes, no prior strokes.
97 Etiology?? Any Historical Clues?? Age 65yo male Tempo of Onset Acute ( awoke with symptoms )
98 Neurologic Diagnostic Process Where is the Lesion? Phenomenology Dysarthria Lesion???? Etiology????
99 Next Step??? 1) MRI Brain 2) MRI Cervical Spine 3) Swallow Study 4)????? 5) Call Neurology
100 Localize the Lesion Determine the subsystem involved Determine likely localization based on the pattern and nature of deficits Confirm and refine localization with other subsystems
101 Localize the Lesion Determine the subsystem involved Determine likely localization based on the pattern and nature of deficits Confirm and refine localization with other subsystems
102 Complaint = Dysarthria Face Arm Leg
103 Localize the Lesion Determine the subsystem involved Determine likely localization based on the pattern and nature of deficits Confirm and refine localization with other subsystems
104 Exam CN II-XII Strength = 5/5 in the Left Tricep, 4/5 Right wrist Extensors, 4/5 Hip flexors. Remainder = normal. Reflexes = 2 throughout. Sensory = normal.
105 Exam CN II-XII Strength = 4/5 in the Left Tricep, 4/5 Right wrist Extensors, 4/5 Hip flexors. Remainder = normal. Reflexes = 2 throughout. Sensory = normal.
106 3. Cortex - Bilateral UE & LE Weakness - Normal Sensory 2. Cervical Face Arm 1. Peripheral Leg.
107 3. Cortex - Bilateral UE & LE Weakness - Normal Sensory Face = Unlikely Cervical 2. Cervical Face Arm 1. Peripheral Leg.
108 3. Cortex - Bilateral UE & LE Weakness - Normal Sensory Face Face 1. Peripheral Arm Arm Leg Leg.
109 3. Cortex - Bilateral UE & LE Weakness - Normal Sensory Face Face 1. Peripheral Arm Arm Leg Leg.
110 - Bilateral UE & LE Weakness - Normal Sensory Face Arm 1. Peripheral Leg
111 3. Cortex - Bilateral UE & LE Weakness - Normal Sensory Face Face 1. Peripheral Arm Arm Leg Leg.
112 Next Step??? MRI Brain MRI Cervical Spine Peripheral Process, No imaging call Neurology
113 Junior Neurologist Thinking it through
114 UMN Motor Unit LMN NMJ Nerve Peripheral: Nerve / Nerve Root Muscle Muscle
115 UMN Motor Unit Peripheral - Weakness Intact reflexes Nl sensory LMN 2. NMJ 3. Nerve 1. Sensory Neuron Muscle
116 UMN Motor Unit Peripheral - Weakness Intact reflexes Nl sensory LMN 2. NMJ 3. Nerve 1. Sensory Neuron Muscle
117 UMN Myasthenia Gravis Motor Unit Peripheral - Weakness Intact reflexes Nl sensory LMN 2. NMJ 3. Nerve 1. Sensory Neuron Muscle
118 Neurologic Diagnostic Process Where is the Lesion? Phenomenology Lesion Bilateral Arm Weakness Peripheral Muscle / NMJ Etiology????
119 Left with Muscle or Neuromuscular Junction Work up = CK Muscle NMJ = AcetylCholine Rec Antibodies
120 Neurologic Diagnostic Process Where is the Lesion? Phenomenology Bilateral Arm Weakness Lesion Etiology Peripheral / NMJ Myasthenia Gravis
121 Think Simple Summary Peripheral or Central will guide FIRST step of evaluation Use Lesion Categories Symmetric, Diffuse or Focal If Peripheral? Both Sensory and Motor Reflexes are VERY HELPFUL
122 UMN LMN Reflexes Hyper Hypo Tone Increased Decreased Atrophy Mild Severe
123 Major Lesion Categories Focal Unilateral Diffuse (Peripheral) Bilateral Asymmetric Symmetric Structural Toxic Metabolic Take Home Point
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