iHuman Advanced DDx Comprehensive Study Guide: Sheila Davis – A 68-
Year-Old Female with Dizziness. Complete Clinical Simulation,
Neurological & Vestibular Assessment, Differential Diagnosis, and
Evidence-Based Management of BPPV | Graded A+ | 2026/2027 Update
,TABLE OF CONTENTS
Section Title Page
1 Case Overview & Clinical Problem Statement 1
2 Patient Demographics & Vital Signs 2
3 Chief Complaint & History of Presenting Illness (HPI) 3
4 OLD CARTS Framework – Complete HPI Analysis 4
5 Recommended Interview Questions & Clinical Rationale 5
6 Past Medical History (PMH) 6
,7 Past Surgical History 7
8 Medications & Over-the-Counter Use 8
9 Allergies & Adverse Reactions 9
10 Family History 10
11 Social History & Functional Status 11
12 Review of Systems (ROS) – Complete 12
13 Physical Examination – General & Vital Signs 13
14 Physical Examination – System-Specific Findings 14
15 Neurological Examination – Mental Status & Cranial Nerves 15
16 Neurological Examination – Motor, Sensory, Cerebellar & Reflexes 16
17 Vestibular & Positional Testing – Dix-Hallpike Maneuver (Technique) 17
18 Dix-Hallpike Maneuver – Interpretation & Findings 18
19 HINTS Examination – Head Impulse, Nystagmus, Test of Skew 19
20 Diagnostic Workup & Laboratory Interpretation 20
21 Comprehensive Differential Diagnosis (Ranked by Likelihood) 21
22 Peripheral vs. Central Causes of Dizziness – Comparative Table 22
23 Final Diagnosis with Diagnostic Criteria 23
24 Pathophysiology of BPPV – Canalithiasis Theory Explained 24
25 Treatment & Management Plan – Overview 25
26 Epley Maneuver – Step-by-Step Procedure with Images (Text Description) 26
27 Alternative Repositioning Maneuvers (Semont & Brandt-Daroff) 27
28 Patient Education & Counseling – Script & Handout Content 28
29 Follow-Up & Monitoring Plan (1 Week, 1 Month, 3-6 Months) 29
30 Complete SOAP Note (Subjective, Objective, Assessment, Plan) 30
31 Clinical Reasoning & Decision-Making Algorithms (ATTEST & STANDING) 31
32 Geriatric Considerations & Fall Prevention Strategies 32
33 Red Flags, Emergency Signs & Referral Criteria 33
34 Common Pitfalls, Misdiagnosis & Pharmacology Pearls 34
35 Evidence-Based Guidelines, Practice Questions & References 35
SECTION 1: CASE OVERVIEW & CLINICAL PROBLEM STATEMENT
Patient: Sheila Davis, 68-year-old female
, Reason for Encounter: Dizziness
Setting: Outpatient clinic with laboratory capabilities
Clinical Problem: Sheila presents with a new-onset episodic dizziness that has been progressively
interfering with her daily activities and sleep. In a 68-year-old patient, dizziness demands a methodical,
multi-system evaluation because the underlying etiology could range from a benign peripheral vestibular
disorder to a life-threatening cerebrovascular event, cardiac arrhythmia, or metabolic derangement.
The First Clinical Task: Characterize what the patient means by "dizziness." This is the most critical step
because the term is non-specific.
Category Definition Sheila's Presentation
Vertigo Illusion of movement (spinning, rocking, tilting) Yes – "room spins," "merry-go-round"
Presyncope Sensation of impending faint or lightheadedness Yes – "wooziness" upon standing
Disequilibrium Feeling of unsteadiness or imbalance while walking Mild – between episodes,
slightly unsteady
Lightheadedness Non-specific "floating" or "head-in-a-fog" feeling Yes – lingering between
episodes
Key Pattern Recognition: The dizziness is triggered (positional) + episodic (brief) + spinning (vertigo) +
reproducible. This constellation strongly points toward a peripheral vestibular etiology, most commonly
Benign Paroxysmal Positional Vertigo (BPPV). However, the presence of mild orthostatic lightheadedness
and a recent increase in antihypertensive medication introduces a contributing vascular component that
must be addressed concurrently.
Main Problem Statement: This case involves the differential diagnosis of complex geriatric dizziness with
both vestibular and cardiovascular contributions. Misdiagnosis or incomplete management could lead to
recurrent falls, fracture (especially with underlying osteopenia), missed stroke, or unmanaged orthostatic
hypotension.
SECTION 2: PATIENT DEMOGRAPHICS & VITAL SIGNS
Demographic Profile
Attribute Details
Full Name Sheila Davis
Age 68 years
Year-Old Female with Dizziness. Complete Clinical Simulation,
Neurological & Vestibular Assessment, Differential Diagnosis, and
Evidence-Based Management of BPPV | Graded A+ | 2026/2027 Update
,TABLE OF CONTENTS
Section Title Page
1 Case Overview & Clinical Problem Statement 1
2 Patient Demographics & Vital Signs 2
3 Chief Complaint & History of Presenting Illness (HPI) 3
4 OLD CARTS Framework – Complete HPI Analysis 4
5 Recommended Interview Questions & Clinical Rationale 5
6 Past Medical History (PMH) 6
,7 Past Surgical History 7
8 Medications & Over-the-Counter Use 8
9 Allergies & Adverse Reactions 9
10 Family History 10
11 Social History & Functional Status 11
12 Review of Systems (ROS) – Complete 12
13 Physical Examination – General & Vital Signs 13
14 Physical Examination – System-Specific Findings 14
15 Neurological Examination – Mental Status & Cranial Nerves 15
16 Neurological Examination – Motor, Sensory, Cerebellar & Reflexes 16
17 Vestibular & Positional Testing – Dix-Hallpike Maneuver (Technique) 17
18 Dix-Hallpike Maneuver – Interpretation & Findings 18
19 HINTS Examination – Head Impulse, Nystagmus, Test of Skew 19
20 Diagnostic Workup & Laboratory Interpretation 20
21 Comprehensive Differential Diagnosis (Ranked by Likelihood) 21
22 Peripheral vs. Central Causes of Dizziness – Comparative Table 22
23 Final Diagnosis with Diagnostic Criteria 23
24 Pathophysiology of BPPV – Canalithiasis Theory Explained 24
25 Treatment & Management Plan – Overview 25
26 Epley Maneuver – Step-by-Step Procedure with Images (Text Description) 26
27 Alternative Repositioning Maneuvers (Semont & Brandt-Daroff) 27
28 Patient Education & Counseling – Script & Handout Content 28
29 Follow-Up & Monitoring Plan (1 Week, 1 Month, 3-6 Months) 29
30 Complete SOAP Note (Subjective, Objective, Assessment, Plan) 30
31 Clinical Reasoning & Decision-Making Algorithms (ATTEST & STANDING) 31
32 Geriatric Considerations & Fall Prevention Strategies 32
33 Red Flags, Emergency Signs & Referral Criteria 33
34 Common Pitfalls, Misdiagnosis & Pharmacology Pearls 34
35 Evidence-Based Guidelines, Practice Questions & References 35
SECTION 1: CASE OVERVIEW & CLINICAL PROBLEM STATEMENT
Patient: Sheila Davis, 68-year-old female
, Reason for Encounter: Dizziness
Setting: Outpatient clinic with laboratory capabilities
Clinical Problem: Sheila presents with a new-onset episodic dizziness that has been progressively
interfering with her daily activities and sleep. In a 68-year-old patient, dizziness demands a methodical,
multi-system evaluation because the underlying etiology could range from a benign peripheral vestibular
disorder to a life-threatening cerebrovascular event, cardiac arrhythmia, or metabolic derangement.
The First Clinical Task: Characterize what the patient means by "dizziness." This is the most critical step
because the term is non-specific.
Category Definition Sheila's Presentation
Vertigo Illusion of movement (spinning, rocking, tilting) Yes – "room spins," "merry-go-round"
Presyncope Sensation of impending faint or lightheadedness Yes – "wooziness" upon standing
Disequilibrium Feeling of unsteadiness or imbalance while walking Mild – between episodes,
slightly unsteady
Lightheadedness Non-specific "floating" or "head-in-a-fog" feeling Yes – lingering between
episodes
Key Pattern Recognition: The dizziness is triggered (positional) + episodic (brief) + spinning (vertigo) +
reproducible. This constellation strongly points toward a peripheral vestibular etiology, most commonly
Benign Paroxysmal Positional Vertigo (BPPV). However, the presence of mild orthostatic lightheadedness
and a recent increase in antihypertensive medication introduces a contributing vascular component that
must be addressed concurrently.
Main Problem Statement: This case involves the differential diagnosis of complex geriatric dizziness with
both vestibular and cardiovascular contributions. Misdiagnosis or incomplete management could lead to
recurrent falls, fracture (especially with underlying osteopenia), missed stroke, or unmanaged orthostatic
hypotension.
SECTION 2: PATIENT DEMOGRAPHICS & VITAL SIGNS
Demographic Profile
Attribute Details
Full Name Sheila Davis
Age 68 years
