A Randomized Multicentre Study for the Acute Relief of Episodic and Chronic Cluster Headache.
A Randomized Multicentre Study for the Acute Relief of Episodic and Chronic Cluster Headache.
The study will look at a non-invasive treatment for people suffering with chronic and
 episodic headaches. Study subjects will be randomized to an active treatment or an in-active
 treatment for 2 weeks. After the 2 weeks all subjects will continue to treat with an active
 treatment for an additional 2 weeks.
The study is a prospective double blind, randomized, sham-controlled, multi-center
 investigation designed for comparison of two parallel groups, GammaCore® (active treatment)
 and a sham, (in-active) treatment. The study period begins with a 1-week run-in period,
 followed by a 2 week comparative period when the subjects are randomized (1:1) to either
 active treatment or sham (in-active) treatment. The comparative period will be followed by an
 open label 2 week period, where the subjects in the sham treatment group will switch in
 treatment assignment and receive an active treatment and the active group will continue to
 receive an active treatment.
Inclusion Criteria:

 -  Is 18 years or older

 -  Has been diagnosed with episodic or chronic cluster headache in accordance with the
 ICHD-2 Classification criteria (2ndEd)

 -  Is capable of completing the 5-point pain scale, disability scale and other
 self-assessments

 -  Agrees to refrain from starting new medication aimed to control the cluster headache
 for the duration of the run-in and randomized phase

 -  Is able to provide written Informed Consent

 Exclusion Criteria:1.

 -  Episodic cluster headache sufferers who are not in a cluster headache bout at the time
 of screening and enrollment

 -  2. Need to commence treatment with oral or injectable steroids for eventual
 concomitant medical conditions

 -  3. Has a lesion (including lymphadenopathy), dysaesthesia, previous surgery or
 abnormal anatomy at the GammaCore® treatment site

 -  4. Is currently taking medication for indications other than CH that in the opinion of
 the clinician may interfere with the study

 -  5. Has a history of any cranial aneurysm, intracranial haemorrhage, brain tumours or
 significant head trauma

 -  6. Diagnosed or suspected secondary headache

 -  7. Has other significant pain problem that might confound the study assessments in the
 opinion of the investigator

 -  8. Has known or suspected severe atherosclerotic cardiovascular disease, severe
 carotid artery disease (e.g. bruits or history of transient ischemic attack (TIA) or
 cerebral vascular accident CVA), congestive heart failure (CHF), known severe coronary
 artery disease or recent (5 years) myocardial infarction

 -  9. Has an abnormal baseline ECG (e.g. second and third degree heart block, atrial
 fibrillation, atrial flutter, recent history of ventricular tachycardia or ventricular
 fibrillation, or clinically significant premature ventricular contraction)

 -  10. Has had a previous, cervical vagotomy

 -  11. Has uncontrolled high blood pressure

 -  12. Is currently implanted with an electrical and/or neurostimulator device, including
 but not limited to cardiac pacemaker or defibrillator, vagal neurostimulator, deep
 brain stimulator, spinal stimulator, bone growth stimulator, or cochlear implant

 -  13. Has a history of carotid endarterectomy or vascular neck surgery

 -  14. Has been implanted with metal cervical spine hardware or has a metallic implant
 near the GammaCore stimulation site

 -  15. Has a recent (12 months) or repeated history of syncope

 -  16. Has a recent (12 months) or repeated history of seizure

 -  17. Has a known history or suspicion of substance abuse or addiction, or overuse of
 acute headache medication

 -  18. Has psychiatric or cognitive disorder and/or behavioural problems which in the
 opinion of the clinician may interfere with the study

 -  19. Is pregnant, nursing, thinking of becoming pregnant in the next 6 weeks 20. Is
 participating in any other therapeutic clinical investigation or has participated in a
 clinical trial in the preceding 30 days

 -  21. Is a relative of or an employee of the investigator or the clinical study site