Evaluation and Management of Headache and Dizziness in a 57-Year-Old Woman
A 57-year-old woman with headache and dizziness requires immediate clinical triage to distinguish between benign primary headache disorders and life-threatening secondary causes, with neuroimaging reserved for patients with red flag features rather than routine use.
Initial Clinical Assessment Priority
The critical first step is determining whether this represents isolated dizziness, combined symptoms suggesting central pathology, or a primary headache disorder with associated dizziness. Your bedside evaluation will determine imaging needs far more accurately than routine scanning 1.
Red Flags Requiring Urgent Evaluation
Look specifically for:
- Blood pressure ≥180/120 mmHg (hypertension-related headache requires this threshold) 2
- New or atypical aura symptoms beyond her usual pattern
- Prolonged focal neurologic deficits (weakness, numbness, visual changes)
- Sudden severe headache ("thunderclap")
- Changes in established headache pattern 3
- Associated ataxia or other neurologic deficits beyond isolated dizziness 1
If any red flags are present, proceed directly to MRI with diffusion-weighted imaging - this has a 4% diagnostic yield versus <1% for CT in isolated dizziness 1.
Imaging Decision Algorithm
Do NOT routinely image if:
- Isolated dizziness without vertigo, ataxia, or neurologic deficits
- Lightheadedness consistent with presyncope (dehydration, hypotension, vasovagal, anxiety)
- Typical primary headache pattern without new features 1
CT head has <1% diagnostic yield in isolated dizziness and should be avoided 1. The trend toward increasing imaging in these patients represents low-value care.
Proceed to MRI brain (without contrast initially) if:
- Suspected central cause based on bedside examination
- Persistent symptoms with unclear etiology
- Any red flag features present
- Age >50 with new-onset headache patterns 4
MRI with diffusion-weighted imaging is the only imaging modality with meaningful diagnostic yield (4%) in this presentation 1. CTA has only 3% yield and adds nothing beyond noncontrast CT 1.
Management Based on Likely Diagnoses
If Primary Headache Disorder (Most Likely)
For acute migraine treatment, options include 5:
- Triptans (first-line)
- Aspirin-acetaminophen-caffeine combination
- CGRP inhibitors (gepants) - newer option
For migraine prevention in episodic migraine 5:
- Angiotensin-receptor blockers or lisinopril
- Topiramate or valproate
- Magnesium or memantine
- CGRP monoclonal antibodies or atogepant (newer agents)
- Do NOT use gabapentin - not recommended for episodic migraine prevention 5
For tension-type headache 5:
- Acute: Ibuprofen 400 mg or acetaminophen 1000 mg
- Prevention (if chronic): Amitriptyline
Non-pharmacologic options for both 5:
- Physical therapy
- Aerobic exercise
If Hypertension-Related
Only diagnose hypertension-related headache if 2:
- BP ≥180/120 mmHg documented
- Temporal association between BP elevation and symptoms
- Symptom relief with antihypertensive treatment
Distinguish dizziness (lightheadedness, unsteadiness) from vertigo (illusion of movement) - vertigo in hypertensive patients requires neurological and ENT evaluation due to increased stroke risk 2.
Critical Pitfalls to Avoid
Over-imaging isolated dizziness - The 22% CT rate and 10% MRI rate in emergency departments represents significant overutilization given <1% CT yield 1
Missing giant cell arteritis - Higher risk in this age group; check ESR/CRP if temporal headache features present 4
Attributing symptoms to hypertension prematurely - Must exclude primary headache disorders first and meet strict diagnostic criteria 2
Using botulinumtoxin for episodic migraine - Only indicated for chronic migraine (≥15 headache days/month), not episodic 5
Assuming all dizziness needs imaging - Clinical triage identifies who needs imaging; routine scanning has extremely low yield 1