What are the differential diagnoses for a patient presenting with dizziness, vomiting, and cool extremities?

Differential Diagnosis: Dizziness, Vomiting, and Cool Extremities

The triad of dizziness, vomiting, and cool peripheries suggests a critical presentation requiring immediate evaluation for cardiovascular shock, posterior circulation stroke, or severe systemic illness—not simply benign peripheral vertigo.

Life-Threatening Causes to Exclude First

Cardiovascular/Circulatory Causes

• Cardiogenic shock or severe hypotension presenting with inadequate peripheral perfusion (cool extremities), compensatory nausea/vomiting, and presyncope/dizziness 1
• Acute pulmonary embolism can present with dizziness, nausea, and peripheral hypoperfusion 2
• Acute myocardial infarction (particularly inferior wall) may present with vagal symptoms including nausea, vomiting, and dizziness 1
• Vasovagal syncope or severe orthostatic hypotension accounts for 22.3% of emergency department dizziness presentations and causes peripheral vasoconstriction with cool extremities 1

Posterior Circulation Stroke

• Cerebellar or brainstem infarction presents with acute vestibular syndrome (AVS)—persistent vertigo, nausea/vomiting, gait instability, and nystagmus 3
• Critically, 25% of patients with AVS have cerebrovascular disease, rising to 75% in high vascular risk cohorts 3
• 75-80% of stroke patients with AVS lack focal neurologic deficits on initial examination, making this diagnosis easily missed 3
• Cool peripheries may indicate autonomic dysfunction from brainstem involvement 4

Metabolic/Systemic Causes

• Severe anemia causes dizziness and peripheral vasoconstriction (cool extremities) 4
• Electrolyte disturbances account for 17.5% of emergency department dizziness cases 1
• Hypoglycemia or other endocrine emergencies (adrenal crisis, thyroid storm) 4
• Carbon monoxide poisoning presents with dizziness, nausea, and peripheral vasoconstriction 4
• Sepsis or severe infection with peripheral hypoperfusion 4

Benign Peripheral Vestibular Causes (Less Likely Given Cool Peripheries)

Acute Vestibular Syndrome

• Vestibular neuritis or labyrinthitis are the most common benign causes of AVS with nausea/vomiting 3
• However, these typically do NOT cause cool peripheries unless the patient has severe dehydration from prolonged vomiting 3
• HINTS examination (Head Impulse, Nystagmus, Test of Skew) by trained practitioners has 100% sensitivity for stroke detection versus 46% for early MRI 3

Other Vestibular Disorders

• Benign paroxysmal positional vertigo (BPPV) is the most common vestibular disorder (22% of ER dizziness) but causes brief episodic vertigo triggered by head movements, not persistent symptoms 5
• Ménière's disease causes recurrent vertigo with hearing loss/tinnitus 3

Critical Diagnostic Approach

Immediate Assessment Required

• Vital signs including orthostatic measurements to identify hypotension, shock, or autonomic failure 1
• Cardiovascular examination for arrhythmia, murmurs, signs of heart failure 1
• Complete neurologic examination including HINTS testing if AVS is present 3, 6
• Timing and triggers assessment: Acute persistent (AVS), episodic spontaneous, or episodic triggered 7

Red Flags Demanding Urgent Imaging

• New focal neurologic deficits (even subtle) 3
• HINTS examination suggesting central cause (normal head impulse test, direction-changing nystagmus, skew deviation) 3, 6
• High vascular risk factors (age >50, hypertension, diabetes, atrial fibrillation, prior stroke) 3
• Severe headache (especially occipital, suggesting vertebral dissection) 4
• Inability to stand or walk (suggests cerebellar stroke) 3

Imaging Recommendations

• MRI head without contrast is the gold standard for suspected posterior circulation stroke in AVS with concerning features 3
• CT head has very low yield (<1% in isolated dizziness with normal exam, but may detect hemorrhage) 3
• No imaging needed if HINTS examination by trained practitioner clearly indicates peripheral vertigo AND patient is low vascular risk 3

Common Pitfalls to Avoid

• Do not assume benign peripheral vertigo based solely on absence of focal neurologic signs—up to 80% of posterior circulation strokes lack these findings initially 3
• Cool peripheries are NOT typical of benign peripheral vertigo and should prompt evaluation for cardiovascular, metabolic, or autonomic causes 4, 1
• Early MRI may be falsely negative in up to 50% of acute strokes, particularly within first 24-48 hours 6
• HINTS examination requires specialized training—when performed by non-experts, accuracy drops significantly 3
• Do not rely on symptom quality alone (vertigo vs. lightheadedness)—this outdated approach does not distinguish benign from dangerous causes 7

Additional Considerations

Drug-Related Causes

• Medication side effects or intoxication can cause dizziness with autonomic symptoms 4
• Thiamine deficiency (Wernicke's encephalopathy) in alcoholics or malnourished patients 4

Unmasking of Compensated Vestibular Disorders

• Acute physiological stress (fever, hypotension, severe anemia) may unmask previously compensated vestibular impairments 4

Misdiagnosis Risk

• 43% of emergency department dizziness diagnoses are corrected on follow-up, with 6% of "benign" diagnoses actually being serious conditions 5
• Stroke is misdiagnosed in 20% of cases initially labeled as vestibular neuronitis 5