Hasummary.pdf

Practice parameter: Evidence-based guidelines for migraine headache (an evidence-based review)
Report of the Quality Standards Subcommittee of the American Academy of Neurology
Stephen D. Silberstein, MD, FACP, for the US Headache Consortium* Mission statement. The Quality Standards Subcommittee (QSS) of the American Academy of Neurology (AAN) is
charged with developing practice parameters for physicians. This practice parameter summarizes the results from the four
evidence-based reviews on the management of patients with migraine: specifically, acute, preventive, and
nonpharmacologic treatments for migraine, and the role of neuroimaging in patients with headache. The full papers for
these treatment guidelines are published elsewhere,1-6 and only the specific treatment recommendations are summarized
below.
Background and justification. Migraine is a very common disorder. An estimated 18% of women and 6% of men
experience migraine, but many go undiagnosed and undertreated.7 There have been a number of advances in the diagnosis
and treatment of migraine as well as great strides in understanding its pathogenesis, making it one of the best understood
of the neurologic disorders. Migraine is characterized by enhanced sensitivity of the nervous system. The attack is
associated with activation of the trigeminal-vascular system.
In June 1998, Duke University’s Center for Clinical Health Policy Research, in collaboration with the AAN, completed four Technical Reviews on migraine sponsored by the Agency for Health Care Policy and Research. Thesereviews covered self-administered drug treatments for acute migraine8; parenteral drug treatments for acute migraine9;drug treatments for the prevention of migraine10; and behavioral and physical treatments for migraine.11 The Educationand Research Foundation of the AAN later funded additional reports on diagnostic testing for headache patients, anupdate on sumatriptan and other 5-HT1 agonists, and a report on butalbital-containing compounds for migraine andtension-type headache, using the same methodology that was used in the original Technical Reviews. A multidisciplinarypanel of professional organizations (The US Headache Consortium) produced four treatment guidelines, each related to adistinct set of management decisions: diagnostic testing (primarily neuroimaging studies), pharmacologic management ofacute attacks, migraine-preventive drugs, and behavioral and physical treatments for migraine.
Clinical question statements. Specific clinical questions addressed in these practice parameters included the following:
Acute and preventive treatment—What are the effects on acute headache pain of medications taken during the attack? What are the effects on the frequency and/or severity of migraine attacks of medications taken on a daily basis forprevention of migraine? How safe and tolerable are acute and preventive migraine medications? How do the efficacy andtolerability issues of medications for migraine compare to placebo, alternative medications, and nonpharmacologictechniques? Diagnostic testing—What is the role of neuroimaging in patients who present with headache? Are particular findings in the history and on the physical examination helpful in identifying which patients have significant intracranialabnormalities? What is the frequency of significant secondary causes of nonacute headache, as detected by CT or MRI, inpatients who present with nonacute headache and a normal neurologic examination? What evidence exists concerning therelative ability of CT and MRI to detect significant intracranial lesions among patients with nonacute headache? Description of the process. Seven organizations participated in The US Headache Consortium: the American Academy
of Family Physicians, AAN, American Headache Society (formerly the American Association for the Study of
Headache), American College of Emergency Physicians, American College of Physicians—American Society of Internal
Medicine, American Osteopathic Association, and National Headache Foundation. Complete descriptions of the
methodologic details are described elsewhere.2
Analysis of evidence. Evidence supporting the acute treatment and preventive treatment were exclusively Class I studies;
however, due to the lack of published Class I evidence, Class II and Class III studies were included for analysis of
*Members of the US Headache Consortium are listed in Appendix 1.
The Evidence-Based Guidelines for Migraine Headache were supported by: Abbott Laboratories, Astra Zeneca, Bristol Myers Squibb, Glaxo Wellcome,Merck, Pfizer, Ortho-McNeil, and the AAN Education & Research Foundation, along with the seven participant member organizations.
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diagnostic testing and utility of neuroimaging in migraine. Clearly effective migraine treatments and techniques areavailable for the acute and preventive treatment of migraine. However, there are few studies on the relative efficacy ofthese agents or how to implement these treatments into successful treatment strategies.
Diagnosis of migraine. The 1988 International Headache Society (IHS) classification of headache system is almost universally accepted and has become the basis for headache classification in the International Classification of Diseases(ICD-10b).12 Migraine is a chronic condition with recurrent episodic attacks. Its characteristics vary among patients andoften among attacks in a single patient. To diagnose migraine, it is necessary to exclude secondary headache causes andthen determine whether the patient has any other coexisting primary headache (e.g., tension-type headache). Testing is notrecommended if the individual is not significantly more likely than anyone else in the general population to have asignificant abnormality. Testing should be avoided if it will not lead to a change in management. However, testing thatnormally may not be recommended as a population policy may make sense at an individual level. Exceptions can beconsidered for patients who are disabled by their fear of serious pathology or for patients about whom the provider issuspicious even in the absence of known predictors of abnormalities on neuroimaging studies (red flags). (In the acuteheadache setting, which was outside of the original guidelines, risk factors for intracranial pathology include acute onset,occipitonuchal location, age >55 years, associated symptoms, and an abnormal neurologic examination. Headache type,severity, characteristics, or duration were not risk factors.13) There was insufficient published clinical research to support evidence-based guidelines for any diagnostic testing other than neuroimaging. Previous reports that reviewed the evidence on the role of EEG found that it is not indicated inthe routine evaluation of headache.14 The following symptoms significantly increased the odds of finding a significant abnormality on neuroimaging in • Rapidly increasing headache frequency• History of lack of coordination• History of localized neurologic signs or a history such as subjective numbness or tingling• History of headache causing awakening from sleep (although this can occur with migraine and cluster headache) The absence of these symptoms did not significantly lower the odds of finding a significant abnormality on Neuroimaging recommendations for nonacute headache are as follows: Patients with an unexplained abnormal finding on the neurologic examination (Grade B)Patients with atypical headache features or headaches that do not fulfill the strict definition of migraine or other primary headache disorder (or have some additional risk factor, such as immune deficiency), when a lower thresholdfor neuroimaging may be applied (Grade C) • Neuroimaging is not usually warranted in patients with migraine and a normal neurologic examination (Grade B).
• No evidence-based recommendations are established for the following: Presence or absence of neurologic symptoms (Grade C)Tension-type headache (Grade C)Relative sensitivity of MRI as compared with CT in the evaluation of migraine or other nonacute headache Treatment of migraine. Migraine varies in frequency, duration, and disability among sufferers and between attacks. It is appropriate to link the intensity of care with the level of disability and symptoms such as nausea and vomiting(stratified care) for the acute treatment of symptoms of an ongoing attack. It is not appropriate to continue ineffective orpoorly tolerated medication in a sequential and arbitrary manner (step care). Consider preventive treatment (given on anongoing basis whether or not an attack is present) for those patients whose migraine has a substantial impact on their livesand have not responded to acute care, or where the frequency of migraine attacks is such that the reliance on acute caremedications would increase the potential for drug-induced (rebound) headache. The goals of long-term migrainetreatment, both pharmacologic and nonpharmacologic, are to: • Reduce attack frequency, severity, and disability• Reduce reliance on poorly tolerated, ineffective, or unwanted acute pharmacotherapies• Improve quality of life• Avoid acute headache medication escalation• Educate and enable patients to manage their disease to enhance personal control of their migraine• Reduce headache-related distress and psychological symptoms Migraine Headache Page 3
Behavioral and physical interventions are used for preventing migraine episodes rather than for alleviating symptoms once an attack has begun. Although these modalities may be effective as monotherapy, they are more commonly used inconjunction with pharmacologic management.
• Establish a diagnosis.
• Educate migraine sufferers about their condition and its treatment. Discuss the rationale for a particular treatment, how to use it, and what adverse events are likely.
• Establish realistic patient expectations by setting appropriate goals and discussing the expected benefits of therapy and how long it will take to achieve them. Empower the patients to be actively involved in their own management byencouraging patients to track their own progress through the use of diary cards, flow charts, headache calendars, andforms for tracking days of disability or missed work, school, or family activities. Treatment choice depends on thefrequency and severity of attacks, the presence and degree of temporary disability, and associated symptoms such asnausea and vomiting.
• Create a formal management plan and individualize management: consider the patient’s response to, and tolerance for, specific medications. Consider comorbidity/coexisting conditions. Coexisting conditions (such as heart disease,pregnancy, and uncontrolled hypertension) need to be ascertained as they may limit treatment choices.
• Encourage the patient to identify and avoid triggers.
Acute treatment. Goals of acute migraine treatment are as follows: 1. Treat attacks rapidly and consistently without recurrence.
2. Restore the patient’s ability to function.
3. Minimize the use of back-up and rescue medications. (A rescue medication is used at home when other treatments fail and permits the patient to achieve relief without the discomfort and expense of a visit to the physician’s office oremergency department.) 4. Optimize self-care and reduce subsequent use of resources.
5. Be cost-effective for overall management.
6. Have minimal or no adverse events.
• Use migraine-specific agents (triptans dihydroergotamine [DHE]) in patients with moderate or severe migraine or whose mild-to-moderate headaches respond poorly to nonsteroidal anti-inflammatory drugs (NSAIDs) orcombinations such as aspirin plus acetaminophen plus caffeine. Failure to use an effective treatment promptly mayincrease pain, disability, and the impact of the headache.
• Select a nonoral route of administration for patients with migraine associated with severe nausea or vomiting. Antiemetics should not be restricted to patients who are vomiting or likely to vomit. Nausea itself is one of the mostaversive and disabling symptoms of a migraine attack and should be treated appropriately.
• Consider a self-administered rescue medication for patients with severe migraine who do not respond to (or fail) • Guard against medication-overuse headache (“rebound headache” or “drug-induced headache”). Frequent use of acute medications (ergotamine [not DHE], opiates, triptans, simple analgesics, and mixed analgesics containingbutalbital, caffeine, or isometheptene) is generally thought to cause medication-overuse headache. Many experts limitacute therapy to two headache days per week on a regular basis. Patients with medication overuse should usepreventive therapy.
Evidence-based recommendations for acute treatment of migraine. A summary of evidence for treatment of acute attacks of migraine is presented in table 1. Table 2 provides a summary of acute therapies for migraine.
Specific medications.
Triptans (serotonin1B/1D receptor agonists). • Naratriptan, rizatriptan, sumatriptan, and zolmitriptan. Triptans are effective and relatively safe for the acute treatment of migraine headaches and are an appropriate initial treatment choice in patients with moderate to severemigraine who have no contraindications for its use (Grade A).
• Initial treatment with any triptan is a reasonable choice when the headache is moderate to severe or in migraine of any severity when nonspecific medication has failed to provide adequate relief in the past (Grade C).
• Patients with nausea and vomiting may be given intranasal or subcutaneous sumatriptan (Grade C).
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Table 1 Evidence summary for treatment of acute attacks of migraine
Sumatriptan nasal spray A +++ +++ Occasional Moderate-to-severe migraine. Useful when nonoral route needed. Less severe migrainewhen nonopiate medications fail.
Oral triptans Moderate-to-severe migraine. Less severe migraine when nonopiate medications fail.
Naratriptan A ++ ++ InfrequentRizatriptan A +++ +++ OccasionalSumatriptan A +++ +++ OccasionalZolmitriptan A +++ +++ Occasional Sumatriptan SC A +++ +++ Frequent Moderate-to-severe migraine. Useful when nonoral route needed. Less severe migrainewhen nonopiate medications fail.
DHE IV B ++ +++ Frequent Low recurrence.
DHE SC/IM B +++/++ +++ Occasional Moderate-to-severe migraine. Less severe migraine when nonopiate medications fail.
DHE IV plus antiemetics B +++ +++ Frequent Status migrainosus. Therapy of choice in DHE nasal spray A ++ ++ Occasional Moderate-to-severe migraine. Less severe migraine when nonopiate medications fail.
Ergotamine B + ++ Frequent Consider for selected patients with moderate-to- PR/IV B ++ ?/++Prochlorperazine PR/IM B +++ +/++ Occasional IM/IV adjunct first-line therapy in emergency department or office; consider PR as adjunct.
Acetaminophen B 0 + Infrequent Pregnant migraineur.
Ketorolac IM B + ++ Infrequent Consider in emergency department.
Oral NSAIDS Occasional First-line for mild-to-moderate migraine.
Aspirin A ++ ++Diclofenac K B ++ ++Flurbiprofen B + ++Ibuprofen A ++ ++Naproxen B + ++Naproxen sodium A ++ ++ Acetaminophen, aspirin, caffeine A +++ ++ Infrequent First-line for migraine.
Butalbital, ASA, caffeine C ? +++ Occasional Occasional use for moderate-to-severe migraine.
Butalbital, ASA, caffeine, codeine B ++ +++ Butorphanol nasal spray A +++ +++ Frequent Moderate to severe migraine; rescue therapy.
Opiates—oral combinations A ++ ++ Occasional Moderate to severe migraine; rescue therapy.
Opiates—parenteral B ++ ++ Frequent Reserved for emergency department use or Butorphanol IMMeperidine IM/IVMethadone IM Corticosteroids C + ++ Infrequent Rescue therapy in status migrainosus.
IV plus antiemeticsDexamethasoneHydrocortisone Isometheptene compound B + ++ Infrequent Mild-to-moderate headache.
Lidocaine IN B ++ ? Frequent Uncertain.
* See Appendix 2 for explanations of quality of evidence, scientific effect, and clinical impression of effect.
? = not known; NSAIDs = nonsteroidal anti-inflammatory drugs; ASA = acetylsalicylic acid.
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Table 2 Acute therapies for migraine
Group 1* Group 2† Group 3‡ Group 4§ Group 5¶
Specific Acetaminophen plus codeine PO Butalbital, aspirin, plus
Naratriptan PO Butalbital, aspirin, caffeine, plus Ergotamine PO Chlorpromazine IM Hydrocortisone IV Rizatriptan PO Butorphanol IM Ergotamine plus caffeine PO Granisetron IVSumatriptan SC, IN, PO Chlorpromazine IM, IV Metoclopramide IM, PR Lidocaine IVZolmitriptan PO Diclofenac K, PODHE SC, IM, IV, IN Ergotamine plus caffeine plus Aspirin PO Lidocaine INButorphanol IN Meperidine IM, IVIbuprofen PO Methadone IMNaproxen sodium PO Metoclopramide IVProchlorperazine IV Naproxen PO * Proven, pronounced statistical and clinical benefit (at least two double-blind, placebo-controlled studies and clinical impression of effect).
† Moderate statistical and clinical benefit (one double-blind, placebo-controlled study and clinical impression of effect).
‡ Statistically but not proven clinically or clinically but not proven statistically effective (conflicting or inconsistent evidence).
§ Proven to be statistically or clinically ineffective (failed efficacy versus placebo).
¶ Clinical and statistical benefits unknown (insufficient evidence available).
• Ergotamine PO/PR (and caffeine combination) may be considered in the treatment of selected patients with moderate • DHE nasal spray is safe and effective for the treatment of acute migraine attacks and should be considered for use in patients with moderate to severe migraine (Grade A).
• DHE SC/IV/IM and nasal spray may be given to patients with nausea and vomiting (Grade C).
• DHE SC, IM, and nasal spray are reasonable initial treatment choices when the headache is moderate to severe, or in migraine of any severity when nonspecific medication has failed to provide adequate relief in the past (Grade C).
• DHE IM, SC may be considered in patients with moderate to severe migraine (Grade B).
• DHE IV plus antiemetics IV is an appropriate treatment choice for patients with severe migraine (Grade B).
Nonspecific medications.
Antiemetics. • Oral antiemetics are an adjunct to treat nausea associated with migraine (Grade C).
• Metoclopramide IM/IV is an adjunct to control nausea (Grade C) and may be considered as IV monotherapy for • Prochlorperazine IV, IM, and PR may be a therapeutic choice for migraine in the appropriate setting (Grade B).
• Prochlorperazine PR is an adjunct in the treatment of acute migraine with nausea and vomiting (Grade C).
• Chlorpromazine IV may be a therapeutic choice for migraine in the appropriate setting (Grade B).
• Serotonin receptor (5-HT3) antagonists are not effective as monotherapy for migraine pain relief (Grade B), but may be considered as adjunct therapy to control nausea in selected patients with migraine attacks (Grade C).
NSAIDs, nonopiate analgesics, and combination analgesics. • Acetaminophen, alone, is not recommended for migraine (Grade B).
• NSAIDs (oral) and combination analgesics containing caffeine are a reasonable first-line treatment choice for mild to moderate migraine attacks or severe attacks that have been responsive in the past to similar NSAIDs or nonopiateanalgesics (Grade A). Ketorolac IM is an option that may be used in a physician-supervised setting, althoughconclusions regarding clinical efficacy cannot be made at this time (Grade C).
• Limit and carefully monitor their use based on overuse, medication-overuse headache, and withdrawal concerns Migraine Headache Page 6
Table 3 Preventive therapies for migraine
Carbamazepine B ++ 0 Occasional to frequent 5Divalproex sodium/sodium valproate A +++ +++ Occasional to frequent 1Gabapentin B ++ ++ Occasional to frequent 2Topiramate C ? ++ Occasional to frequent 3a Amitriptyline A +++ +++ Frequent 1Nortriptyline C ? +++ Frequent 3aProtriptyline C ? ++ Frequent 3aDoxepin, imipramine C ? + Frequent 3a Fluoxetine B + + Occasional 2Fluvoxamine, paroxetine, sertraline C ? + Occasional 3a Bupropion, mirtazepine, trazodone, venlafaxine C ? + Occasional 3a Atenolol B ++ ++ Infrequent to occasional 2Metoprolol B ++ +++ Infrequent to occasional 2Nadolol B + +++ Infrequent to occasional 2Propranolol A ++ +++ Infrequent to occasional 1Timolol A +++ + Infrequent to occasional 1 Diltiazem C ? 0 Infrequent to occasional 3aNimodipine B + ++ Infrequent to occasional 2Verapamil B + ++ Infrequent to occasional 2 Aspirin B + + Infrequent 2FenoprofenFlurbiprofenMefenamic acidIbuprofen C ? + Infrequent 3aKetoprofen B + + Infrequent 2Naproxen/naproxen sodium B + + Infrequent 2 Cyproheptadine C ? + Frequent 3aMethysergide A +++ +++ Frequent 4 Feverfew B ++ + Infrequent 2Magnesium B + + Infrequent 2Vitamin B2 B +++ ++ Infrequent 2 * See Appendix 2 for explanations of quality of evidence, scientific effect, and clinical impression of effect.
† Scale 1-5; see text for definitions.
? = not known; NSAIDs = nonsteroidal anti-inflammatory drugs.
• Butorphanol nasal spray is a treatment option for some patients with migraine (Grade A). Butorphanol may be considered when other medications cannot be used or as a rescue medication when significant sedation would notjeopardize the patient (Grade C). Butorphanol is widely used despite the established risk of overuse and dependence.
Special attention should be given to these clinical concerns.
• Parenteral opiates are a rescue therapy for acute migraine when sedation side effects will not put the patient at risk and when the risk abuse has been addressed (Grade B).
• Consider parenteral and oral combination use in acute migraine only when the risk of abuse has been addressed and sedation will not put the patient at risk (Grade A).
• Isometheptene and isometheptene combination agents may be a reasonable choice for patients with mild-to-moderate • Corticosteroids (dexamethasone or hydrocortisone) are a treatment choice for rescue therapy for patients with status Migraine Headache Page 7
Table 4 Preventive therapies for migraine*
Group 1† Group 2‡ Group 3§ Group 4¶ Group 5||
Amitriptyline B-blockers A: Antidepressants Methysergide Carbamazepine
Divalproex sodium Atenolol/metoprolol/nadolol Bupropion Clomipramine
Propranolol/timolol Doxepine Clonazepam
Nimodipine/verapamil Imipramine Indomethacin Aspirin/fenoprofen/flurbiprofen Paroxetine PindololKetoprofen ProtriptylineMefenamic acid SertralineNaproxen TrazodoneNaproxen sodium Venlafaxine Fluoxetine (racemic) CyproheptadineGabapentin Diltiazem FeverfewMagnesium B: (side effect concerns)Vitamin B2 Phenelzine * Does not include combination products.
† Medium to high efficacy, good strength of evidence, and mild-to-moderate side effects.
‡ Lower efficacy than those listed in first column, or limited strength of evidence, and mild-to-moderate side effects.
§ Clinically efficacious based on consensus and clinical experience, but no scientific evidence of efficacy.
¶ Medium to high efficacy, good strength of evidence, but with side effect concerns.
|| Evidence indicating no efficacy over placebo.
• Evidence is insufficient at this time to establish a defined role for intranasal lidocaine or lidocaine IV in the management of acute migraine headache (Grade B).
Preventive treatment. Tables 3 and 4 summarize preventive therapies for migraine. The goals of migraine preventive therapy are to: 1) reduce attack frequency, severity, and duration; 2) improve responsiveness to treatment of acute attacks;and 3) improve function and reduce disability. One or more of the following helps guide management decisions on theuse of preventive therapies: • Recurring migraines that, in the patients’ opinion, significantly interfere with their daily routines, despite acute • Frequent headaches• Contraindication to or failure or overuse of acute therapies• Adverse events with acute therapies• The cost of both acute and preventive therapies• Patient preference• Presence of uncommon migraine conditions, including hemiplegic migraine, basilar migraine, migraine with prolonged aura, or migrainous infarction (to prevent neurologic damage—as based on expert consensus) These consensus-based principles of care will enhance the success of preventive treatment. Consider nonpharmacologic therapies and take patient preference into consideration.
1. Medication use: A. Initiate therapy with medications that have the highest level of evidence-based efficacy.
B. Initiate therapy with the lowest effective dose of the drug. Increase it slowly until clinical benefits are achieved in the absence of, or until limited by, adverse events.
C. Give each drug an adequate trial. It may take 2 to 3 months to achieve clinical benefit.
D. Avoid interfering medications (e.g., overuse of acute medications).
E.
Use of a long-acting formulation may improve compliance.
A. Monitor the patient’s headache through a headache diary.
B. Re-evaluate therapy. If after 3 to 6 months headaches are well controlled, consider tapering or discontinuing 3. Take coexisting conditions into account. Some (comorbid/coexisting) conditions are more common in persons with migraine: stroke, myocardial infarction, Raynaud’s phenomenon, epilepsy, affective and anxiety disorders. Theseconditions present both treatment opportunities and limitations: Migraine Headache Page 8
A. Select a drug that will treat the coexistent condition and migraine, if possible.
B. Establish that the treatments being used for migraine are not contraindicated for the coexistent disease.
C. Establish that the treatments being used for coexistent conditions do not exacerbate migraine.
D. Beware of all drug interactions.
4. Direct special attention to women who are pregnant or want to become pregnant. Preventive medications may have teratogenic effects. If treatment is absolutely necessary, select a treatment with the lowest risk of adverse effects tothe fetus. 5. Many migraine patients try nonpharmacologic treatment to manage their headaches before they begin drug therapy or concurrently with drug therapy. Behavioral treatments are classified into three broad categories: relaxation training,biofeedback therapy, and cognitive-behavioral training (stress-management training). Physical treatment includesacupuncture, cervical manipulation, and mobilization therapy. These are treatment options for headache suffererswho have one or more of the following characteristics: A. Patient preference for nonpharmacologic interventionsB. Poor tolerance to specific pharmacologic treatmentsC. Medical contraindications for specific pharmacologic treatmentsD. Insufficient or no response to pharmacologic treatmentE.
F. History of long-term, frequent, or excessive use of analgesic or acute medications that can aggravate headache problems (or lead to decreased responsiveness to other pharmacotherapies) G. Significant stress or deficient stress-coping skills Cognitive and behavioral treatment recommendations.
• Relaxation training, thermal biofeedback combined with relaxation training, electromyographic biofeedback, and
cognitive-behavioral therapy may be considered as treatment options for prevention of migraine (Grade A). Specificrecommendations regarding which of these to use for specific patients cannot be made.
• Behavioral therapy may be combined with preventive drug therapy to achieve additional clinical improvement for • Evidence-based treatment recommendations regarding the use of hypnosis, acupuncture, transcutaneous electrical nerve stimulation, chiropractic or osteopathic cervical manipulation, occlusal adjustment, and hyperbaric oxygen aspreventive or acute therapy for migraine are not yet possible.
Pharmacologic preventive therapy.
Individual medications have been put into treatment groups based on their established clinical efficacy, significant adverse events, safety profile, and clinical experience of the US Headache Consortium participants: Group 1. Medications with proven high efficacy and mild to moderate adverse events.
Group 2. Medications with lower efficacy (i.e., limited number of studies, studies reporting conflicting results, efficacy suggesting only “modest” improvement) and mild to moderate adverse events.
Group 3. Medication use based on opinion, not randomized controlled trials.
a) Low to moderate adverse eventsb) Frequent or severe adverse events (or safety concerns) or complex management issuesGroup 4. Medication with proven efficacy but frequent or severe adverse events (or safety concerns), or complex Group 5. Medications proven to have limited or no efficacy.
Conclusion. The evidence-based analysis on the role of neuroimaging in migraine and the efficacy and safety of migraine
therapies is one of the first and most extensive cooperative projects available for creating practice parameters across
disciplines. These four evidence-based reviews reflect the high level of concern physicians have for the migraine patient,
and the need for improving care across disciplines. These guidelines are intended to improve care and outcomes for all
migraine sufferers. Hopefully, these evidence-based treatment guidelines for the migraine patient will be widely
disseminated and provide a basis for future outcomes research.
Disclaimer. This statement is provided as an educational service of the American Academy of Neurology. It is based on
an assessment of current scientific and clinical information. It is not intended to include all possible proper methods of
care for a particular neurologic problem or all legitimate criteria for choosing to use a specific procedure. Neither is it
intended to exclude any reasonable alternative methodologies. The AAN recognizes that specific patient care decisions
are the prerogative of the patient and the physician caring for the patient, based on all of the circumstances involved.
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Acknowledgment
The authors and US Headache Consortium thank Starr Pearlman, PhD, and Joanne Okagaki for their help in preparing this manuscript
and for their administrative support. They also thank Jes Olesen, Jean Schoenen, Helene Massiou, Peer Tfelt Hansen, F. Cankat
Tulunay, and Kai Jensen.
Appendix 1
The US Headache Consortium: J. Keith Campbell, MD; Frederick G. Freitag, DO; Benjamin Frishberg, MD; Thomas T. Gilbert, MD,
MPH; David B. Matchar, MD; Donald B. Penzien, PhD; Michael P. Pietrzak, MD, FACEP; Nabih M. Ramadan, MD; Jay H.
Rosenberg, MD; Todd D. Rozen, MD; Stephen D. Silberstein, MD, FACP; Eric M. Wall, MD, MPH; William B. Young, MD.
American Academy of Neurology Quality Standards Subcommittee Members: Gary Franklin, MD, MPH—Co-chair; Catherine A. Zahn,MD—Co-chair; Milton Alter, MD, PhD; Stephen Ashwal, MD; John Calverley, MD; Richard Dubinsky, MD; Jacqueline French, MD;Michael Glantz, MD; Michael K. Greenberg, MD; Gary Gronseth, MD; Deborah Hirtz, MD; Robert G. Miller, MD; James Stevens,MD; and William Weiner, MD Appendix 2
Levels of evidence
Level I. Independent, blind comparison with a “gold standard” of anatomy, physiology, diagnosis, or prognosis among a large number of consecutive patients suspected of having the target condition.
Level II. Independent, blind comparison with a “gold standard” among a small number of consecutive patients suspected of having Level III. Independent, blind comparison with a “gold standard” among nonconsecutive patients suspected of having the target Level IV: Included studies that did not meet criteria for at least Level III evidence.
Strength of evidence (quality of evidence)
Grade A. Multiple well-designed randomized clinical trials, directly relevant to the recommendation, yielded a consistent pattern Grade B. Some evidence from randomized clinical trials supported the recommendation, but the scientific support was not optimal. For instance, few randomized trials existed, the trials that did exist were somewhat inconsistent, or the trials were not directlyrelevant to the recommendation. An example of the last point would be the case where trials were conducted using a study group thatdiffered from the target group of the recommendation.
Grade C. The US Headache Consortium achieved consensus on the recommendation in the absence of relevant randomized Scientific effect measures
0 The medication is ineffective or harmful.
+ The effect of the medication is either not statistically or not clinically significant (i.e., less than the minimal clinically significant ++ The effect of the medication is statistically significant and exceeds the minimally clinically significant benefit.
+++ The effect is statistically significant and far exceeds the minimally clinically significant benefit.
Clinical impression of effect
0 Ineffective: most people get no improvement.
+ Somewhat effective: few people get clinically significant improvement.
++ Effective: some people get clinically significant improvement.
+++ Very effective: most people get clinically significant improvement.
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Approved by the Quality Standards Subcommittee April 1, 2000. Approved by the Practice Committee May 3, 2000. Approved by theAAN Board of Directors June 9, 2000. Published in Neurology 2000;55:754-763.
Copyright 2000 by AAN Enterprises, Inc.

Source: http://www.schmerzklinik.de/wp-content/uploads/2009/02/gl0085.pdf