Greg Book. September 25, 2007 Olin Neuropsychiatry Research Center
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1 Migraine Pathogenesis Greg Book September 25, 2007 Olin Neuropsychiatry Research Center
2 Migraine Migraine i affects approximately 19.2% of females and 6.6% of males in the United States. (Patel, Bigal et al. 2004) Resulting in approximately 112 million lost work days amounting to nearly $8 billion a year in lost productivity (Hu, Markson et al. 1999) September 25, 2007 Migraine Pathogenesis 2
3 Migraine without Aura Migraine i without t aura is described d as Recurrent headache disorder manifesting in attacks lasting 4-72 hours. Typical characteristics of the headache are unilateral location, pulsating quality, moderate or severe intensity, aggravation by routine physical activity and association with nausea and/or photophobia and phonophobia. - International Classification of Headache Disorders, Section September 25, 2007 Migraine Pathogenesis 3
4 Migraine with Aura Migraine i with aura is described d as Typical aura consisting of visual and/or sensory and/or speech symptoms. Gradual development, duration no longer than one hour, a mix of positive and negative features and complete reversibility characterise the aura which is associated with a headache fulfilling criteria for 1.1 Migraine without aura. - International Classification of Headache Disorders, Section September 25, 2007 Migraine Pathogenesis 4
5 Migraine Ow. My head s been hurting while at work all day. I have migraine. Probably not September 25, 2007 Migraine Pathogenesis 5
6 Migraine Progression Interictal period Aura (sometimes) PAIN (always) trigger Resolution (hopefully always) September 25, 2007 Migraine Pathogenesis 6
7 Migraine Triggers Flashing lights Loud sounds Strong odors (perfume, etc) Aged cheese (tyramine) Caffeine Chocolate Alcohol Sleep changes Stress MSG Nitrates Artificial sweeteners Tension headache e Stress letdown Menstruation Pregnancy Menopause Birth control pills Acid reflux Not eating Smoking Changes in barometric pressure High humidity And the unknown triggers September 25, 2007 Migraine Pathogenesis 7
8 Migraine Symptoms Aura can include sensory hallucinations Migraine pain Stabbing pain Like a knife is being twisted in my head September 25, 2007 Migraine Pathogenesis 8
9 Aura Occurs in only 18-36% of migraineurs (Davidoff 2002) Mostly visual aura; scintillating lights and scotoma Sometimes Auditory Olefactory gustatory hallucinations. Rare aura: Vertigo Aphasia Hemiparesis Delerium Alice in Wonderland phenomena September 25, 2007 Migraine Pathogenesis 9
10 Aura Pathophysiology Trigger Migraine Pain September 25, 2007 Migraine Pathogenesis 10
11 Cortical Spreading Depression Quick neuronal depolarization followed by long lasting neural suppression. Slow progression across the cortex (2-3mm/min) Quick increase in regional cerebral blood flow (rcbf) [thin dark band] followed by sustained decrease in rcbf [wide white band] Leao et al (1944) was first to ( call it spreading depression. September 25, 2007 Migraine Pathogenesis 11
12 Previous CSD Studies Flashing checkerboards, 16s on, 16s off. A) Progression of activation during scan of basketball subject. B) BOLD signal at point indicated by circle. Green arrow indicates onset of visual aura. C) spontaneous attack from separate subject. D) rcbf from rat superimposed on basketball subject. Hadjikhani (2001) scanned a migraine patient with extremely predictable aura and migraine. Always gets migraine after playing basketball. Shows definite spreading depression across the occiptal lobe. September 25, 2007 Migraine Pathogenesis 12
13 Migraine generator theories 1. CSD (in migraine w/aura) causes the migraine to begin (Bolay 2002). 2. A silent CSD in migraine w/out aura gives rise to migraine attack. 3. Migraine triggers activate brainstem structures (dorsal raphe nucleus, periaqueductal grey, locus coeruleus) and begin the migraine attack. (*my favorite) (summary from Sanchez 2004) September 25, 2007 Migraine Pathogenesis 13
14 Migraine Pain Ouch. September 25, 2007 Migraine Pathogenesis 14
15 Trigeminovascular Mechanism This trigeminal autonomic reflex is present in normal persons (Goadsby 2002). And regulation may be abnormal in migraine i attacks (Giffin 2003). Cortex Hypothalamus Thalamus Dorsal raphe nucleus Locus ceruleus Imaging studies suggest that modulation of the trigeminovascular nociceptive input comes from the dorsal raphe nucleus, locus ceruleus,, and nucleus raphe magnus (Goadsby 2003) Dura Trigeminal ganglion Pterygopalatine ganglion Superior salivatory nucleus Magnus raphe nucleus (Goadsby 2002) September 25, 2007 Migraine Pathogenesis 15
16 Parasympathetic activation of menengial nociceptors Burstein and Jakubowski (2005) state the areas (hypothalamic, limbic, cortical) that project to the superior salivatory nucleus also receive afferent connections from the trigeminovascular pathway. So the trigeminovascular pathway can activate the same brain areas that have triggered its own activity in the first place. Therefore, Burstein proposes that t this loop invalidates migraine generator areas found in fmri studies because they are likely driven by the migraine i pain itself 50+ limbic & hypothalamic areas (red dots) may be influenced by migraine triggers (Burstein et al 2005) SSN superior salivatory nucleus SPG sphenopalatine ganglion BNST bed nucleus stria terminalis LH lateral hypothalamus PAG periaqueductal gray Pir piriform cortex PVN paraventricular hypothalamic nucleus September 25, 2007 Migraine Pathogenesis 16
17 Now for the pain Migraine pain is of a pulsing quality. Worse during normal pressure-causing activities such as touch, coughing, and pulsing arterial blood pressure. Burstein (2001) states that it may be caused by meningial primary afferent neurons that t have become hyperexcited and the neurons of the trigeminal ganglion have become hyperexcited September 25, 2007 Migraine Pathogenesis 17
18 Resolution Effects of Triptans Dura 5- HT 1B Vessel Trigeminal Ganglion Trigeminal Nucleus C1 Brain Stem 5-HT 1D Periphera l neuron 5- HT 1B/D/F Central neuron C2 (Goadsby 2002) September 25, 2007 Migraine Pathogenesis 18
19 The study Inclusion Criteria: Female, age Current menstrual migraine as defined by ICHD-II No history of head injury, epilepsy, or status migrainosis; no current Axis 1 disorder; no previous treatment of migraine with opiates Subjects: 6 Migraine w/aura; 6 Migraine w/out aura; 6 healthy controls September 25, 2007 Migraine Pathogenesis 19
20 The study Objective: Find CSD or changes in vessel diameter Use ICA to find areas of activation during a migraine Tasks: Two 15 minute runs of 16s flashing checkerboards (2Hz) and 16s fixation Subject indicates pain level when the level changes. September 25, 2007 Migraine Pathogenesis 20
21 Menstrual Migraine Migraine i (all types) 1.92 times more likely to occur at onset of menses (Day 0) Best to scan between -1 and 3 days of onset of menses Tension type headache Migraine without Aura Migraine i with Aura Stewart et al 2000 September 25, 2007 Migraine Pathogenesis 21
22 Imaging Migraine fmri 128x128x32 BOLD Induce migraine. images;tr=2.5s Observe cortical BOLD 3 Runs; 10 minutes each signal changes MRA 320x256x90 TOF 3D Image cranial vessels to observe changes in arterial diameter before and after BOLD September 25, 2007 Migraine Pathogenesis 22
23 Results Recruitment goal: 6 Migraine w/aura; 6 Migraine w/out aura; 6 healthy controls Actual recruitment: 4 Migraine w/aura; 5 Migraine w/out aura; 3 healthy controls Actual subjects scanned: 1 Migraine w/aura; 3 Migraine w/out aura; 3 healthy controls Successful scans: 1 Migraine w/out aura; 2 non-migraine September 25, 2007 Migraine Pathogenesis 23
24 Subjects #1 Migraine w/out aura 24 year old female Monthly menstrual migraines since age 12 Takes Zomig as resuce medication #2 No migraine 49 year old female Scored 2 on MIDAS. Would not diagnose as having migraine #3 No migraine 23 year old healthy female September 25, 2007 Migraine Pathogenesis 24
25 MRA results Post > Pre Migraine w/out aura (#1) Healthy control (#2) September 25, 2007 Migraine Pathogenesis 25
26 fmri results using ICA Migraine w/out aura (#1) Results similar to Borsook et al (2004) Trigeminal ganglion No migraine (#2) September 25, 2007 Migraine Pathogenesis 26
27 Difficulties Inducing a true and lasting migraine i Observing the true beginning of the migraine i Subject willingness September 25, 2007 Migraine Pathogenesis 27
28 Study Improvements Use ASL sequence instead of BOLD to observe cortical spreading depression Recruit more subjects September 25, 2007 Migraine Pathogenesis 28
29 Acknowledgements Vince Calhoun, PhD Tanya Bilchik, MD Godfrey Pearlson, MD Subject #1 Rachel September 25, 2007 Migraine Pathogenesis 29
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