How should I clerk and perform a holistic examination of a homeless HIV‑positive asthmatic woman presenting with acute ascending lower‑limb weakness, spasticity, hyperreflexia, and a sensory level?

Approach to Clerking and Examining an HIV-Positive Asthmatic Homeless Woman with Acute Ascending Lower Limb Weakness

This patient's presentation of acute ascending weakness with spasticity, hyperreflexia, and a sensory level in the context of advanced HIV infection most likely represents HIV-associated myelopathy or an opportunistic spinal cord infection—both potentially reversible with prompt antiretroviral therapy and targeted treatment. The asthma is a secondary consideration unless she presents in acute respiratory distress.

Immediate Priority Assessment (First 5 Minutes)

Airway and Breathing Status

• Assess respiratory function immediately: Can she complete full sentences? Respiratory rate, oxygen saturation, use of accessory muscles, peak flow if cooperative 1, 2
• Asthma severity markers: If tachypneic (>25/min), tachycardic (>110 bpm), or unable to speak in sentences, treat as acute severe asthma first 2
• Critical pitfall: Do NOT assume her weakness is purely neurological if she has respiratory distress—acute severe asthma can present atypically and requires immediate bronchodilator therapy

Neurological Emergency Screen

• Bladder function: Urinary retention or incontinence indicates cord compression requiring urgent imaging
• Sensory level documentation: Precisely map the dermatomal level—this localizes the spinal cord lesion
• Progression timeline: Hours to days suggests infection/inflammation; weeks suggests HIV myelopathy 3, 4
• Upper limb examination: If upper limbs are also weak, consider ascending polyradiculopathy (HIV-associated GBS-like syndrome) 5

Structured History Taking

HIV-Specific History

• Treatment status: When diagnosed? Ever on antiretroviral therapy (ART)? If yes, when stopped and why? 3
• CD4 count and viral load: If known, this predicts opportunistic infection risk
• AIDS-defining illnesses: Previous tuberculosis, cryptococcal meningitis, toxoplasmosis, CMV infection
• Medication adherence barriers: Homelessness creates storage issues, missed appointments, lack of follow-up 6

Neurological Symptom Progression

• Onset pattern: Acute (hours-days) versus subacute (weeks-months)
• Ascending pattern: Started in feet/legs and moving upward? This suggests polyradiculopathy 5
• Associated symptoms: Fever (suggests infection), back pain (epidural abscess), bowel/bladder dysfunction (cord compression)
• Sensory symptoms: Numbness, tingling, burning—document the pattern and level

Social and Risk Assessment

• Homelessness duration and conditions: Five years on streets increases risk of malnutrition (B12 deficiency), substance use, missed medical care 6
• Substance use: Injection drug use increases hepatitis C risk and bacterial infections 6
• Sexual history: Recent partners, condom use (assesses adherence to safer practices)
• Nutrition: Vitamin B12 deficiency can cause subacute combined degeneration mimicking HIV myelopathy

Asthma Control Assessment

• Current symptoms: Frequency of wheeze, nocturnal symptoms, exercise limitation
• Medication use: What inhalers does she have access to? How often using rescue inhaler?
• Recent exacerbations: ED visits, hospitalizations, ICU admissions 7
• Triggers: Cold air, respiratory infections (common in HIV with low CD4)

Comprehensive Physical Examination

Neurological Examination (Systematic Approach)

Upper Motor Neuron Pattern Confirmation:

• Tone: Spasticity in lower limbs (velocity-dependent increased resistance)
• Power: Grade each muscle group (hip flexors, knee extensors, ankle dorsiflexors/plantarflexors)
• Reflexes: Hyperreflexia at knees and ankles; test for clonus (sustained rhythmic contractions)
• Plantar responses: Extensor (Babinski sign) bilaterally confirms upper motor neuron lesion
• Abdominal reflexes: Absent below the lesion level

Sensory Level Mapping:

• Pin-prick testing: Start from feet, move upward to find exact dermatomal level where sensation changes
• Light touch and proprioception: Document all modalities
• Sacral sparing: Preserved perianal sensation suggests incomplete cord lesion (better prognosis)

Upper Limb Assessment:

• Must examine thoroughly: If upper limbs show weakness or sensory loss, consider brain involvement or ascending polyradiculopathy 5
• Cerebellar signs: Ataxia, dysmetria, nystagmus (HIV can cause isolated cerebellar dysfunction) 8

HIV-Related Systemic Examination

Oral cavity: Candidiasis (white plaques), oral hairy leukoplakia (suggests low CD4), Kaposi sarcoma lesions

Skin: Kaposi sarcoma (purple nodules), seborrheic dermatitis, molluscum contagiosum, herpes zoster scars

Lymph nodes: Generalized lymphadenopathy (HIV itself) versus localized (tuberculosis, lymphoma)

Chest examination:

• Respiratory: Crackles (pneumonia, PCP), wheeze (asthma), reduced air entry
• Cardiac: Tachycardia, signs of heart failure (HIV cardiomyopathy in advanced disease)

Abdominal examination: Hepatosplenomegaly (opportunistic infections, lymphoma)

Asthma-Specific Examination

• Respiratory rate and pattern: Tachypnea, use of accessory muscles
• Auscultation: Wheeze (expiratory or throughout), silent chest (life-threatening) 1
• Peak expiratory flow: If >50% predicted, not acute severe; if <50%, treat aggressively 2

Differential Diagnosis Framework

Most Likely Diagnoses (Given Spasticity + Hyperreflexia + Sensory Level)

1. HIV-associated vacuolar myelopathy: Subacute, progressive, occurs with CD4 <200; potentially reversible with ART 3, 4

2. Opportunistic spinal cord infection:

   • Tuberculosis: Pott's disease with cord compression
   • CMV polyradiculomyelitis: Acute/subacute, ascending weakness
   • Toxoplasmosis: Rare spinal involvement
   • Cryptococcal meningomyelitis: Can involve cord

3. HIV-associated inflammatory polyradiculopathy: Mimics Guillain-Barré syndrome, can occur in primary or advanced HIV 5

4. Spinal cord compression: Lymphoma, epidural abscess (especially if IV drug use)

5. Nutritional myelopathy: B12 deficiency (subacute combined degeneration)—common in homeless population with poor nutrition

Less Likely but Must Exclude

• Meningovascular syphilis: Can cause stroke-like deficits or myelopathy in HIV patients 9
• HTLV-1 myelopathy: If from endemic area (Caribbean, Japan, Africa)

Investigations to Order Immediately

Urgent (Within Hours)

• MRI spine with contrast: Identifies cord lesions, compression, inflammation 3, 4
• MRI brain with contrast: Excludes cerebral pathology if any upper limb or cranial nerve signs 3, 8
• Lumbar puncture (after imaging excludes mass effect):
  • Cell count, protein, glucose
  • Gram stain, bacterial culture
  • Cryptococcal antigen, India ink
  • TB PCR and culture
  • CMV PCR
  • VDRL (syphilis)
  • Cytology (lymphoma)

Same Day

• HIV viral load and CD4 count: Determines disease stage and guides differential 3
• Complete blood count: Cytopenias suggest advanced HIV or medication toxicity
• Comprehensive metabolic panel: Renal function (HIV nephropathy risk), electrolytes
• Vitamin B12 and folate: Nutritional deficiency screening
• Syphilis serology: RPR/VDRL and treponemal test 9
• Hepatitis B and C serology: Common coinfections in homeless population 6

Asthma-Related (If Symptomatic)

• Peak expiratory flow: Objective measure of airflow obstruction 2
• Oxygen saturation: Maintain >92% 1
• Chest X-ray: Only if life-threatening features or concern for pneumothorax/pneumonia 1

Management Approach

Neurological Management

Initiate ART immediately if not already on treatment—even before all results return, as HIV myelopathy and encephalomyelopathy can dramatically reverse with ART 3. Use intensive regimen (integrase inhibitor + 2 NRTIs; consider protease inhibitor if high viral load) 3.

Empiric treatment considerations:

• If CD4 <100 and acute presentation: Consider empiric treatment for CMV (ganciclovir) while awaiting CSF results
• If TB endemic area or suggestive history: Start anti-TB therapy empirically
• Do NOT give corticosteroids until infections excluded (worsens opportunistic infections)

Asthma Management (If Acute Exacerbation Present)

Mild-moderate (PEF >50%, speaking in sentences): Nebulized salbutamol 5mg or terbutaline 10mg; prednisolone 30-60mg orally 2

Severe (PEF <50%, cannot complete sentences):

• Oxygen 40-60% 1
• Nebulized salbutamol 5mg + ipratropium 0.5mg via oxygen-driven nebulizer 1, 2
• Prednisolone 30-60mg or IV hydrocortisone 200mg 1
• Repeat nebulizers every 15-30 minutes if not improving 1

Life-threatening (PEF <33%, silent chest, confusion, cyanosis):

• All of the above PLUS IV aminophylline 250mg over 20 minutes or IV salbutamol 1
• Prepare for ICU transfer 1

Holistic Social Care

• Immediate: Admit to hospital for safe environment, nutrition, medication storage
• Multidisciplinary team: Social work, case management, substance abuse counseling if applicable 10, 6
• Discharge planning: Arrange housing support, directly observed therapy for ART if adherence concerns, linkage to HIV clinic with short follow-up interval 10

Key Teaching Points for Medical Students

Common pitfalls to avoid:

1. Assuming asthma is the primary problem: The neurological findings are the emergency here
2. Delaying ART initiation: HIV myelopathy is reversible if treated early 3
3. Missing the sensory level: This localizes the lesion and guides imaging
4. Forgetting nutrition: B12 deficiency is common in homeless populations and treatable
5. Inadequate social assessment: Homelessness creates barriers to all aspects of care 6

This case demonstrates the intersection of infectious disease, neurology, respiratory medicine, and social determinants of health—requiring systematic assessment, urgent investigation, and coordinated multidisciplinary management to prevent permanent disability.