Elsevier

The Lancet Neurology

Volume 1, Issue 4, August 2002, Pages 251-257
The Lancet Neurology

Review
Pathophysiology of cluster headache: a trigeminal autonomic cephalgia

https://doi.org/10.1016/S1474-4422(02)00104-7Get rights and content

Summary

Cluster headache is a form of primary neurovascular headache with the following features: severe unilateral, commonly retro-orbital, pain accompanied by restlessness or agitation, and cranial (parasympathetic) autonomic symptoms, such as lacrimation or conjunctival injection. It occurs in attacks typically of less than 3 h in length and in bouts (clusters) of a few months during which the patient has one or two attacks per day. The individual attack involves activation of the trigeminal-autonomic reflex; thus, such headaches can be broadly classified with the other trigeminal-autonomic cephalgias, such as paroxysmal hemicrania and the syndrome of short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing. Observations of circadian biological changes and neuroendocrine disturbances have suggested a pivotal role for the hypothalamus in cluster headache. Functional neuroimaging with PET and anatomical imaging with voxelbased morphometry have identified the posterior hypothalamic grey matter as the key area for the basic defect in cluster headache.

Section snippets

Genetics of cluster headache

Cluster headache is highly likely to be caused, or at least predisposed to, by inheritance of susceptibility genes,17 just as is thought to be likely for migraine. Kudrow18 studied 495 individuals with cluster headache; 27% of the 405 male patients and 37% of the 90 female patients were found to have at least one affected first-degree relative. Of the patients' 990 parents, 1-8% had cluster headache. a proportion much higher than the population prevalence. Kudrow's finding of a probable genetic

Key pathophysiological features of neurovascular headache

The three major features of the pathophysiology of cluster headache are: trigeminal distribution of the pain; cranial autonomic features; and an episodic pattern of attacks. The latter is, in many ways, the defining clinical signature of the disorder compared with migraine.25

These features raise the classic issues of the location of the lesion and the generic terminology that should be applied to these and related headaches, such as migraine. Ekbom's classic observation during angiography in a

Trigeminovascular system

The trigeminovascular system is in a unique, indeed pivotal position in cerebrovascular physiology.30 It is the sole sensory (afferent) innervation of the cerebral vessels and also has an efferent potential in pathophysiological settings (figure 1).33

The trigeminovascular system consists of the neurons innervating the cerebral vessels and dura mater that have cell bodies located in the trigeminal ganglion. The ganglion contains bipolar cells—the peripheral fibre makes a synaptic connection with

Cluster headache as a TAC

Cluster headache forms part of a broad clinical differential diagnosis of short-lasting headaches (Panel 3). “Short” is a relative term; these headaches contrast with attacks of migraine or tension-type headache, which may persist for many hours or days.1 The clinically differentiating factor for the TACs as a group is the prominence of cranial autonomic activation, manifest as lacrimation, conjunctival injection, eyelid oedema, or rhinorrhoea.62 Although TACs are generally short-lasting, there

Cluster headache—a disorder of the posterior hypothalamic grey matter

Several lines of study suggest that central nervous mechanisms, particularly those involving the hypothalamus, have a role in cluster headache. Clinical observations and neuroendocrine studies suggested such a link, which has been further investigated by functional imaging techniques. Taken together, the results strongly suggest a role for the posterior hypothalamus in cluster headache.

PET studies of cluster headache

PET with oxygen-15-labelled water to trace blood flow has been used to study brain activation during acute cluster headache. Areas activated fell into three categories: areas generally associated with pain; an area that seems specific to cluster headache; and vascular structures.32

The anterior cingulate was significantly activated, as would be expected, since in most human PET studies of pain, activation of the this region is observed, perhaps as a part of the affective response.89 Activation

Unresolved issues

Although there has been progress in understanding of cluster headache, many issues remain unanswered, and some might be usefully highlighted.

Why should there be a male preponderance? Is this related to the hypothalamic involvement, and how do we account for the many female patients involved?

How does the bout begin? More importantly, how does it end? There seems to be some very important photoperiodicity implicated in the start of the bout. Further functional imaging may help to elucidate this

Conclusion

How can we regard cluster headache in pathophysiological terms? Some might suggest that cluster headache is a TAC, in which acute attacks involve activation of the trigeminovascular system, as shown by both the distribution of pain predominantly in the ophthalmic division of the trigeminal nerve and changes in cranial concentrations of neuropeptides. Thus, the acute attack of pain may be regarded as a manifestation of the trigeminal-autonomic reflex. The clinical feature of circannual and

Search strategy

Data for this review were obtained by a search of PubMed and from manual searches of the past 3 years' volumes of Cephalalgia and Headache, as well as articles identified from the author's personal database. Search terms were “cluster headache” and variations of the terms in Panel 2.

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