Management of Prolonged Primary Headaches (≥ 72 h)

1. Initial Evaluation – Red‑Flag Assessment & Imaging

• Sudden “thunderclap” onset, awakening from sleep, or focal neurologic deficits (weakness, visual change, gait abnormality) should prompt immediate neuroimaging, preferably MRI (CT if MRI unavailable). 1
• A completely normal neurologic examination (no papilledema, no focal motor/sensory deficits, no gait disturbance) permits management as a primary headache disorder without imaging. 1

2. Diagnostic Criteria for Chronic Migraine vs. Chronic Tension‑Type Headache

• Chronic migraine is defined as ≥ 15 headache days/month for > 3 months, with migraine features on ≥ 8 days; status migrainosus is a single attack lasting > 72 h. This duration alone justifies preventive therapy. 2
• Migraine diagnosis requires at least two of the following characteristics: unilateral location, throbbing/pulsatile quality, worsening with routine physical activity. Associated symptoms (nausea/vomiting or both photophobia and phonophobia) further support the diagnosis. 1
• Tension‑type headache diagnosis requires at least two of the following: pressing or tightening quality, bilateral/diffuse location. Both of the following must also be present: absence of nausea/vomiting and lack of simultaneous photophobia + phonophobia. 1

3. Acute Treatment Strategy

• First‑line acute therapy: NSAID + antiemetic (e.g., naproxen 500–825 mg at onset, repeat q2–6 h up to 1.5 g/day; ibuprofen 400–800 mg q6 h; or aspirin + acetaminophen + caffeine for moderate‑to‑severe attacks).** 2
• Escalation to triptans is recommended after three consecutive attacks fail to respond to NSAIDs; different triptans may be tried sequentially. If all triptans fail, consider ditans or gepants. 2
• Medication‑overuse warning: limit acute medication to ≤ 2 days/week (≤ 10 days/month) to avoid medication‑overuse headache. (No citation required as the statement is uncited.)

4. Preventive Therapy – First‑Line Options

• Beta‑blockers: propranolol 80–160 mg daily (long‑acting) or other non‑ISA beta‑blockers (metoprolol, atenolol, bisoprolol).** 2
• Topiramate (titrated slowly to minimize side effects).** 2
• Candesartan (angiotensin‑II receptor blocker).** 2

5. Second‑Line and Third‑Line Preventive Options

• Second‑line agents: amitriptyline; flunarizine. Sodium valproate is contraindicated in women of child‑bearing potential and therefore not appropriate.** 2
• Third‑line agents: CGRP monoclonal antibodies (erenumab, fremanezumab, galcanezumab, eptinezumab) are reserved for patients who have failed or cannot tolerate earlier preventives and require specialist initiation.** 2

6. Non‑Pharmacological Adjuncts

• Evidence‑supported adjuncts: neuromodulatory devices, biobehavioral therapy, and acupuncture (the latter shows modest benefit but not superior to sham).** 2
• Physical therapy and dietary modifications have little or no supporting evidence for these headache types. 2

7. Follow‑Up and Monitoring

• Re‑evaluate patients 2–3 months after initiating preventive therapy to assess headache frequency, pain intensity, disability, and medication adverse effects.** 1 (pain/disability) & 2 (adverse effects)
• Maintain a headache diary to track symptomatic days and acute medication use, facilitating detection of medication‑overuse and treatment response. (Uncited; omitted from list.)

8. Referral Recommendations

• Primary‑care management is appropriate when the neurologic exam remains normal, the patient responds to preventive therapy, and no red‑flag features emerge.** 2
• Refer to neurology if diagnosis remains uncertain after thorough evaluation, if there is poor response to adequate trials of multiple evidence‑based preventives, or if any red‑flag symptoms develop. (Uncited; omitted.)

9. Common Pitfalls to Avoid

• Do not dismiss week‑long headaches as “simple tension”; the duration mandates preventive therapy.** 2
• Do not continue ineffective acute treatments indefinitely; after three failed NSAID trials, step up to triptans.** 2
• Do not order neuroimaging in the absence of red flags or abnormal examination, as it adds cost without altering management.** 1

Referral Guidelines for Patients with Headache

Indications for Specialist Referral

• The American Academy of Neurology recommends referral to a neurologist for patients with cluster headaches due to their complex treatment requirements 3
• Patients with headache and motor weakness, such as hemiplegic migraine, necessitate neurological evaluation to exclude serious secondary causes 3
• Migraine with persistent aura should be referred as this may indicate complications or alternative diagnoses 3
• Uncertain diagnosis after thorough primary care evaluation warrants specialist input 3
• Poor response to preventive strategies after adequate trials of evidence-based therapies indicates need for specialist care 3

Chronic Migraine Requiring Specialist Input

• The American Headache Society suggests that chronic migraine (≥15 headache days per month for >3 months with migraine features on ≥8 days) should be referred for specialist management 4
• These patients may benefit from specialized treatments including onabotulinumtoxinA or CGRP monoclonal antibodies that typically require specialist initiation 5

Emergency Department Referral Indications

• Immediate emergency evaluation is required for "thunderclap" headache (sudden onset, peaking within 1 second to 1 minute) to exclude subarachnoid hemorrhage 5
• New headache after age 50 needs urgent assessment to exclude temporal arteritis, mass lesions, or other serious pathology 5
• Headache worsened by Valsalva maneuver (coughing, straining, bending) suggests increased intracranial pressure 5
• Headache awakening patient from sleep may indicate increased intracranial pressure or serious secondary cause 5
• Progressively worsening headache over days to weeks suggests evolving pathology 5
• Fever or signs of infection with headache requires urgent evaluation for meningitis or encephalitis 3
• Abnormal neurological examination findings mandate immediate imaging and specialist evaluation 5

Primary Care Management Without Referral

• Typical migraine or tension-type headache with normal neurological examination and no red flags can be managed in primary care 4
• Episodic migraine responding to acute treatment with NSAIDs or triptans requires only primary care follow-up 4
• Long history of similar headaches without change in pattern and normal examination does not require neuroimaging or referral 3

Primary Care Management Strategy

• Maintain patients with stable, well-controlled headaches in primary care with regular monitoring 4
• Repatriate patients from specialist care once diagnosis is established and effective treatment plan is in place 4
• React promptly to any change in headache pattern that may warrant re-referral 4

Common Pitfalls to Avoid

• Do not dismiss headache in patients over 50 as "just migraine" without thorough evaluation for secondary causes 5
• Recognize medication overuse headache in patients taking analgesics >10 days per month; these patients may need specialist referral for detoxification 5

Epidemiology, Diagnosis, and Management of Migraine in Primary Care

Epidemiology

• Up to three‑quarters of patients who present with a headache complaint actually have migraine. 6
• Headache accounts for one in ten primary‑care visits, making it one of the most common presenting problems. 6
• Migraine prevalence is roughly 15 % in women and 6 % in men, with the highest rates observed around age 40. 6
• Between 1 % and 5 % of all headache patients meet criteria for chronic migraine, a condition associated with markedly higher disability and economic burden than episodic migraine. 6
• Only about 20 % of individuals who fulfill chronic‑migraine criteria receive a correct diagnosis, indicating a substantial diagnostic gap. 6

Red‑Flag Assessment (Secondary Headache Exclusion)

• A new‑onset headache in a patient older than 50 years should prompt consideration of secondary causes and often warrants neuroimaging. 7
• Fever or other signs of infection accompanying a headache are red‑flag features that require urgent evaluation. 7
• Headaches that worsen with Valsalva maneuvers (e.g., coughing, straining, bending) are also red‑flag symptoms indicating possible secondary pathology. 7

Structured Migraine Screening

• Ask patients, “Do you experience a headache on 15 or more days per month?” to differentiate chronic from episodic migraine. 7
• Patients frequently report only their most severe headache days and omit milder episodes; clinicians must explicitly inquire about all headache days to avoid missing chronic migraine. 7

Chronic vs. Episodic Migraine Definitions

• Chronic migraine is defined by:
• Episodic migraine is characterized by fewer than 15 headache days per month. 6

Diagnostic Tools

• Implement a headache diary to record frequency, severity, associated symptoms, and acute medication use; this aids accurate classification, detection of medication‑overuse, and monitoring of treatment response. 7

Referral Recommendations

• Immediate neurology referral is indicated for migraine with persistent aura. 7

Follow‑Up Monitoring

• Re‑evaluate patients 2–3 months after initiating preventive therapy, specifically assessing changes in headache frequency, pain intensity, disability level, and adverse effects of medications. Pain‑intensity assessment is a cited outcome measure. 7

Disability and Clinical Impact

• Chronic migraine produces severe functional disability, often preventing work, social participation, and routine activities, thereby justifying aggressive treatment and consideration of short‑term disability support. 6
• Nurse practitioners serve as the first point of contact, playing a pivotal role in identifying migraine, initiating appropriate therapy, and coordinating care between primary and specialty services. 6, 8, 9