What is the appropriate emergency department approach to an adult male presenting with headache and nausea?

Emergency Department Approach to Adult Males with Headache and Nausea

The first priority is to rapidly exclude life-threatening secondary causes—particularly subarachnoid hemorrhage, meningitis, and posterior circulation stroke—through targeted history, focused neurological examination, and selective neuroimaging before initiating symptomatic treatment. 1

Initial Red-Flag Assessment

The emergency physician must systematically screen for features that mandate urgent investigation rather than symptomatic treatment:

• "Worst headache of life" or thunderclap onset (reaching maximal intensity within seconds to minutes) suggests subarachnoid hemorrhage until proven otherwise 1
• New severe headache in patients >50 years or those with vascular risk factors (hypertension, diabetes, prior stroke) raises concern for posterior circulation stroke 1, 2
• Fever with headache and nausea requires evaluation for meningitis or encephalitis 3, 4
• Focal neurological deficits (weakness, sensory loss, visual changes, ataxia, dysarthria) indicate structural pathology 1, 2
• Altered mental status or decreased level of consciousness beyond typical post-ictal state 3, 4
• Recent head trauma within the preceding weeks 1, 4
• Immunocompromised state (HIV, transplant, chemotherapy) 1
• Headache that worsens with Valsalva maneuver or awakens patient from sleep 1

Neuroimaging Decision Algorithm

When to Image Immediately

Non-contrast CT head is insufficient for ruling out subarachnoid hemorrhage beyond 6 hours from onset; if clinical suspicion remains high despite negative CT, lumbar puncture is mandatory to detect xanthochromia. 1, 5

• Obtain non-contrast CT head as the initial study for suspected subarachnoid hemorrhage (sensitivity 98-100% within 12 hours, declining to 93% at 24 hours and 57-85% at 6 days) 1
• If CT is negative but thunderclap headache occurred >6 hours prior, perform lumbar puncture with CSF analysis for xanthochromia and red blood cell count 1, 5
• For suspected posterior circulation stroke (especially in patients >50 with vascular risk factors), MRI brain with diffusion-weighted imaging is superior to CT (4% diagnostic yield vs <1% for CT) 2
• High vascular risk patients with acute vestibular symptoms require MRI even with normal neurological examination, as 11-25% harbor posterior circulation stroke 2

When Imaging is NOT Indicated

• Typical migraine pattern in a patient with prior similar episodes and normal neurological examination 1, 6
• Headache meeting strict migraine criteria without atypical features 1
• Tension-type headache with normal examination 6

A critical pitfall is assuming a normal neurological examination excludes stroke—75-80% of patients with posterior circulation infarction present without focal deficits. 2

Acute Pharmacologic Management (After Excluding Secondary Causes)

First-Line IV Combination Therapy for Severe Migraine

The most evidence-based approach combines metoclopramide 10 mg IV plus ketorolac 30 mg IV, providing synergistic analgesia while minimizing rebound headache risk. 7, 5, 6

• Metoclopramide 10 mg IV provides direct analgesic effects through central dopamine receptor antagonism, independent of its antiemetic properties 7, 5
• Ketorolac 30 mg IV (or 60 mg IM in patients <65 years) offers rapid onset with approximately 6-hour duration and minimal rebound headache risk 1, 7, 5
• This combination is superior to either agent alone and represents the highest-quality evidence for ED migraine treatment 5, 6

Alternative IV Options

• Prochlorperazine 10 mg IV has comparable efficacy to metoclopramide with a more favorable side-effect profile (21% vs 50% adverse events) 7, 5
• Dihydroergotamine (DHE) 0.5-1.0 mg IV has good evidence as monotherapy, particularly when NSAIDs are contraindicated (maximum 2 mg/day) 7, 5
• Dexamethasone 10-24 mg IV reduces headache recurrence at 24-72 hours but should be reserved for status migrainosus after first-line agents 5, 6

Contraindicated Therapies

Opioids (meperidine, hydromorphone, oxycodone) should be absolutely avoided for migraine treatment due to questionable efficacy, high risk of medication-overuse headache, potential for dependence, and worse long-term outcomes. 1, 7, 5

• If an opioid must be used (when all other options are contraindicated), butorphanol nasal spray has better evidence than parenteral opioids 7
• Diphenhydramine provides no analgesic benefit and should only be used to reduce akathisia from prochlorperazine 6

Nausea Management

• Metoclopramide 10 mg IV or prochlorperazine 10 mg IV are preferred because they provide both antiemetic and analgesic effects 7, 5, 6
• The IV route is essential when significant vomiting is present, as oral absorption is impaired 1, 7
• Metoclopramide is contraindicated in pheochromocytoma, seizure disorders, GI bleeding, and GI obstruction 7
• Prochlorperazine is contraindicated in CNS depression and concurrent use of adrenergic blockers 7

Hydration Considerations

• IV fluids should be limited to cases of documented dehydration 8, 6
• Routine IV hydration for all headache patients lacks evidence and may delay discharge 8

Disposition and Medication-Overuse Headache Prevention

All acute migraine medications must be limited to ≤2 days per week (≤10 days per month) to prevent medication-overuse headache, which paradoxically increases headache frequency and can lead to daily headaches. 1, 7, 5

Discharge Criteria

• Pain reduction to mild or tolerable levels 6
• Ability to tolerate oral intake 6
• No red-flag features identified 3, 4
• Reliable follow-up arranged 8

Mandatory Preventive Therapy Referral

Patients requiring acute treatment >2 days per week need immediate initiation or optimization of preventive therapy:

• First-line preventive agents: propranolol 80-240 mg/day, topiramate, or amitriptyline 30-150 mg/day 7, 5
• CGRP monoclonal antibodies when oral preventives fail (efficacy assessed after 3-6 months) 5
• OnabotulinumtoxinA is the only FDA-approved preventive specifically for chronic migraine (≥15 headache days/month) 7

Critical Pitfall

Lack of referral to a headache specialist or primary care for preventive therapy results in high rates of ED recidivism and progression to chronic daily headache. 8

Special Populations

Patients with Uncontrolled Hypertension

• Acetaminophen 1000 mg is the safest first-line analgesic, as NSAIDs can further elevate blood pressure 7
• Triptans are contraindicated in uncontrolled hypertension 1, 7

Patients on Oral Contraceptives

• Document oral contraceptive use, as it increases risk of cerebral venous sinus thrombosis 2
• Consider this diagnosis in young women with new severe headache and nausea 2

Laboratory Testing

• Fingerstick glucose should be checked immediately, as hypoglycemia is the most frequently identified unexpected abnormality 2
• Comprehensive laboratory panels rarely change management in patients with isolated headache and normal examination 2
• Consider basic metabolic panel only if history or examination suggests specific abnormalities (e.g., suspected hyponatremia, renal dysfunction) 2