Abstract
Purpose of review
Among the spectrum of pain conditions, cluster headache represents one of the most severe. Targeted therapies for cluster headache are evolving thus improving the available therapeutic armamentarium. A better understanding of the currently available therapies, as well as new and emerging options, may aide physicians to manage affected sufferers better by evolving treatment guidance.
Recent findings
While classic first-line medications are useful in some patients with cluster headache, they are often accompanied by significant side effects that limit their use. Recently, novel treatments with better tolerability and decreased medication interactions have proven to be effective. A remarkable example of this is the blockage of the calcitonin gene-related peptide pathway with monoclonal antibodies, which may be a key element in the future treatment of cluster headache. The sphenopalatine ganglion and vagus nerve perform a critical role in the regulation of pain and the trigeminal autonomic reflex. Neuromodulation therapies targeting these structures have shown excellent tolerability and few significant adverse events, constituting a promising form of treatment. Finally, several potential therapeutic targets are examined in this review, such as small molecule CGRP receptor antagonists, known as gepants, and serotonin receptor 5-HT1F receptor agonists: ditans.
Summary
In summary, a deepening of the understanding of cluster headache mechanisms in recent years has driven the evolution of sophisticated therapeutic approaches that could allow a new era in the treatment of this difficult condition.
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Introduction
Cluster headache (CH) is a relatively rare primary headache disorder. It is the most common of the trigeminal autonomic cephalalgias (TACs) [1], with a population prevalence of approximately 0.1% [2, 3]. It is characterized by attacks of unilateral head pain that escalates rapidly [4], generally located in the orbital and supraorbital region, associated with ipsilateral cranial autonomic symptoms, such as conjunctival injection, lacrimation, rhinorrhoea and nasal congestion [5]. Some patients also report characteristically lateralized associated symptoms, such as photophobia or phonophobia [6, 7]. Affected patients typically report cluster headache as being the worst type of pain they have ever experienced [8, 9]. The attacks of pain last between 15 and 180 min, are usually followed by rapid offset of pain, in contrast with migraine and tend to have a circadian pattern with a nocturnal presentation, as well as a circannual seasonality with bouts lasting 6–12 weeks in its episodic form. In about 15% of cluster headache subjects [10, 11], the breaks between attack bouts last less than 3 months: classified as chronic cluster headache [5]. The frequency of attacks can go between one in 48 h and eight in 24 h.
While the pathophysiology of cluster headache has not been entirely dissected, there are several proposed mechanisms described. These include a genetic predisposition [2], involvement of the trigeminovascular and cranial parasympathetic nervous systems and the role of the central nervous system and particularly of the hypothalamic region, which is thought to have a key role in the genesis of the attacks [12,13,14].
Given the severity of CH, early diagnosis and adequate management of the acute attacks, as well as prevention during the bouts, and in the chronic form, are crucial. Fortunately, there are several options currently available to tackle this complex disorder. These include, as a first-line approach, primarily high-flow oxygen, intranasal zolmitriptan and sumatriptan, and subcutaneous sumatriptan for the acute treatment of attacks and verapamil for CH prevention [15].
This review will cover the well-established, first-line treatment options and then expand on newer targets and emerging therapies, which may represent a safer and better-tolerated option for CH management in the future.
Classic acute attack treatments
The aim of acute treatment in CH is to terminate the attack as quickly as possible, without headache recurrence and with a minimum of adverse events.
Oxygen
Oxygen is currently one of the most used acute medications for CH, with nearly 80% of patients benefitting from its use [16]. Although its mechanism of action is not completely understood, possible components include an inhibition of responsive neurons on the trigeminocervical complex [17] and modification of neuropeptide release [18].
The effectiveness of high-flow oxygen in CH is remarkable; it is well tolerated with few adverse events; it is applicable repeatedly throughout the day and can also be combined with other treatments [16, 19, 20]. The major drawback for oxygen use is the portability of the cylinders [21]. Furthermore, it is not approved by the Food and Drug Administration (FDA), nor is it available or reimbursed in every country [22].
The possibility of a rebound headache after oxygen inhalation [23] can be mitigated by taking the treatment at the very beginning of the attack [24], by increasing the duration of inhalation or by selecting a different delivery system such as a demand valve system, which is preferred by some patients [25].
Triptans (serotonin 5-HT1B/1D receptor agonists)
Sumatriptan 6 mg subcutaneous is an effective [26, 27] and safe option [28], which is both FDA and EMA approved and, unlike oxygen, compact and portable. Zolmitriptan 5 mg [29, 30] or sumatriptan 20 mg [31] by nasal spray are reasonable and efficacious non-invasive options, especially for patients showing aichmophobia [29, 30]. Another needle-free presentation of zolmitriptan has been recently tested at 3.8 mg as an intradermal micro-needle patch in a randomized placebo-controlled study on migraine patients [32]. Although the endpoint aimed to discover significant differences in headache-free rates at 2 h, the median time to maximum serum concentration (tmax) was less than 20 min, making this medication a potential option for CH as well.
Triptans are contraindicated in patients with coronary and cerebrovascular diseases [33]. Other drawbacks include limits on daily usage [34] and a higher rate of side effects, compared to inhaled oxygen, viz. injection site reactions for sumatriptan, nausea, paraesthesia or chest tightness [26, 35].
Classic treatments to prevent attacks
The objective of preventive medication is to reduce the frequency of attacks, to decrease suffering and disability and to avoid issues linked to daily consumption of acute therapy.
Verapamil
Verapamil is a voltage-dependent calcium channel blocker. Its effect in cluster headache is not entirely elucidated and may be related to the prevention of CGRP release, by inhibition of presynaptic calcium influx [36]. At a daily dose of 240–960 mg, it represents the first-line preventive treatment for most patients with cluster headache [15, 37].
Recommendation for its use is based on small trials that showed efficacy in reducing the number of attacks in episodic [38] and chronic CH [39]. Verapamil has acceptable tolerability [39], although side effects such as constipation, ankle oedema and gingival hyperplasia are often reported at high doses [40]. The most critical side effects are certainly cardiac rhythm and atrioventricular abnormalities, through prolongation of the PR interval, which can develop in 19–38% of patients [41, 42]. For this reason, electrocardiograms should be performed regularly during its use [42]. Verapamil is not approved by the FDA or EMA for CH [43].
Lithium
Lithium carbonate exerts different modulatory actions, such as diminishing excitatory neurotransmission [44]. Lithium at the dose of 900 mg demonstrated efficacy on chronic CH, with a longer latency period in comparison with verapamil [39] and a larger number of adverse effects, including tremor or nausea [45]. Aside from these common side effects, treatment with lithium requires serum levels to be monitored and maintained within a range of 0.6–1.2 meq/L [46]. Furthermore, renal, liver and thyroid function needs to be checked regularly with long-term use [15].
Topiramate
Topiramate is a sulphamate derived from d-fructose. Its mechanism of action comprises at least three pathways: enhancing of GABA neurotransmission, decreasing glutamate levels and reducing of the activity of l-type calcium channels [47], among others [48]. Its use is recommended for cluster headache [15] based on case series [49,50,51,52,53], although not all series are positive [54].
Deterioration in cognitive function [55], weight loss and paraesthesia are frequently reported side effects of topiramate. The medication has also been associated with suicidal tendencies [56] and should thus be used with caution in at-risk subjects.
Systemic corticosteroids
The anti-inflammatory properties of corticosteroids could act in CH by modulating the hyperactivity of the trigeminal pathways and the hypothalamic dysfunction during a typical bout [57], although corticosteroid action is complex. There is some evidence for recommending either short-term decreasing doses of oral prednisone 60–100 mg for 5 days followed by a tapering of 10 mg/day [15, 58, 59] or intravenous methylprednisolone [60, 61]. Both of these treatments seem to be beneficial for short periods, yet their prolonged use is hindered by serious side effects, such as psychosis or osteonecrosis.
Local corticosteroids
Greater occipital nerve (GON) blockade is a minimally invasive procedure consisting of an injection of corticosteroids mixed with local anaesthetic in the region of the most tender area of the suboccipital region. GON blocks have proven effective in CH in two randomized placebo-controlled trials [62, 63]. Their effect could be attributed to a modulation of altered signalling at the trigeminocervical complex, where trigeminal and occipital afferents converge [64, 65]. The long-term benefit and low rate of side effects, mostly mild and localized [66], make GON blocks a relevant option to be considered in the early treatment of cluster bouts [67]. There is limited evidence for the application of multiple cranial nerve injections [68] and a higher morbidity in comparison with a single injection.
Melatonin
Melatonin is a hormone that may exert an effect in cluster headache through its direct action on the suprachiasmatic nucleus of the hypothalamus [69]. A randomized placebo-controlled trial suggested that it is beneficial in CH at 10 mg daily, especially in patients with an episodic pattern, and at the early stage of a bout [38]. It was not effective in chronic CH, although this has been investigated with variable dose regimes [38, 70]. Melatonin is generally well tolerated [38], with mild drowsiness as the notable issue [71].
Emerging treatments
The CGRP pathway
Cranial serum CGRP rises in cluster headache during both spontaneous [18] and induced attacks [72] and is normalized with efficacious acute treatment, such as oxygen or sumatriptan [18]. Furthermore, CH attacks can be induced by CGRP infusion in patients with episodic cluster [73] and, with less consistency, in chronic CH patients using preventive treatment.
Monoclonal antibodies against the CGRP pathway
Antibodies targeting either the peptide or the canonical CGRP receptor are effective in the preventive treatment in migraine [74]. To date, only two of the available anti-CGRP pathway antibodies have been tested as a preventive treatment in cluster headache, namely galcanezumab and fremanezumab. Both are CGRP peptide monoclonal antibodies. The two remaining monoclonals, erenumab and eptinezumab, have so far only been studied for migraine prevention [75].
Galcanezumab is a subcutaneously administered humanized monoclonal antibody that neutralizes the CGRP peptide [76] that has recently been approved by the FDA for use in the prevention of episodic CH. Galcanezumab 300 mg was used in a multi-centre double-blind randomized placebo-controlled trial involving one-hundred and six patients, of whom forty-nine received the antibody. At the 3-week primary endpoint, a significant reduction in the frequency of attacks was achieved, with 3.5 less weekly attacks and 18% more subjects in the active treatment group achieving a 50% reduction compared to placebo. Furthermore, 21% of the subjects who discontinued the study were those randomized to the placebo group, in contrast to 8% of those who discontinued in the active group [77]. No severe side effects were reported, with injection site reactions as most commonly reported one, present in 8% of treated patients.
A second trial in the prevention of episodic cluster headache involved fremanezumab [78]. This study, however, was terminated early due to futility, as no significant efficacy difference was demonstrated between the treatment and placebo groups. An issue in the trial design was represented by the primary endpoint being set at 4 weeks, instead of earlier. Thus, the natural termination of the bouts’ length could have played an important role in the benefit observed in the placebo group. It is noteworthy in this regard that both recent positive studies in episodic CH, galcanezumab [77] and prednisone [59], set primary endpoints at 3 weeks and 1 week, respectively, in line with the natural history described in current trial guidance [79].
Interestingly, chronic cluster headache patients did not benefit either from galcanezumab [80] or from fremanezumab (NCT02797951).
Neuromodulation
Modulation of the peripheral nerve system, either of an invasive or non-invasive nature, is becoming an increasingly popular treatment option for the management of headache disorders. In the field of cluster headache, the most notable of these techniques with positive controlled trials are non-invasive vagus nerve stimulation (nVNS) and invasive sphenopalatine ganglion stimulation (SPG). Newer options such as percutaneous electrical nerve stimulation (PENS) and percutaneous pulsed radiofrequency are increasingly being studied as well.
Non-invasive vagus nerve stimulation
Transcutaneous stimulation of the vagus nerve has been tested in headache conditions through the use of the gammaCore™ (electroCore, LLC; Basking Ridge, NJ, USA), a device that transfers electrically stimulates the cervical branch of the vagus nerve in a non-invasive manner.
This approach was first studied systematically as an acute and preventive treatment of cluster headache in a clinical audit that showed encouraging results. In this initial study, almost 80% of the nineteen patients treated with gammaCore™ responded to the treatment, either with reduced attack frequency or abortion of acute attacks [81]. Following the open-label study, two large randomized controlled trials tested the efficacy of nVNS as an acute treatment for CH in the USA—ACT1 study [82]—and Europe—ACT2 study [83]. The results from these studies showed that response rates, measured as either pain relief [82] or pain freedom [83] at 15 min from attack treatment, were significantly higher with nVNS than with sham. This was only found, however, in the episodic cluster headache cohort and not in chronic CH patients.
The PREVA study investigated the use of gammaCore™ as a preventive treatment in CH [84]. In this study, nVNS associated with standard of care (SoC) brought to a significantly greater reduction in the number of weekly cluster attacks compared to SoC alone, as well as to a significant reduction of the use of acute attack medication.
Based on the results of these studies, the gammaCore™ device is now CE marked in the European Union for acute and/or preventive treatment of cluster headache and has been FDA and NICE [85] approved for the treatment of both episodic and chronic CH.
The mechanisms for nVNS efficacy in cluster headache are still mostly unknown, but hypotheses centre on possible effects on the trigeminovascular system through direct and indirect connections of the vagus nerve in the brainstem [86], dose-dependent modulation of trigeminocervical neurons [87] and specific connections between visceral vagal nuclei and areas of the pain matrix [88].
Sphenopalatine ganglion stimulation
The sphenopalatine ganglion is a pivotal structure in the pathophysiology of cluster headache and in particular of its typical cranial autonomic manifestations [89]. Modulation of the SPG was first attempted as acute treatment of CH in a proof of concept study involving five patients, using a removable electrode. In this study, the device resulted in a pain-free outcome in 61% of the eighteen treated attacks [90].
In the Pathway CH-1 study, the efficacy and safety of surgically implanted SPG stimulation were tested in twenty-eight European chronic refractory CH patients. Subjects were randomized to either active stimulation (lasting 15 min during the attack), sub-perception stimulation or sham [91]. Of the five-hundred and sixty-six treated attacks, treatment with active stimulation brought pain relief in 67% of cases, while sham and sub-threshold stimulation only in 7% of attacks.
The Pathway CH-2 study [92] was a randomized controlled trial involving ninety-three chronic CH patients based in the USA, treating their attacks with either active SPG stimulation or sham. Comparing SPG-stimulated and sham-stimulated attacks, patients were more often pain free at 15 min with active treatment. The beneficial effects of SPG stimulation as an acute treatment for CH have been demonstrated in open-label registry study of thirty-three patients from the Pathway CH-1 study to persist for at least 2 years in two-thirds [93].
Implantation of the sphenopalatine ganglion is an invasive procedure that can cause adverse events, comprising swelling, pain and sensory disturbances in the site of implantation. In general, these side effects are well tolerated and resolve within a few months, very rarely have they required explantation of the device [91, 92].
In conclusion, SPG stimulation seems like a viable option for severely impaired CH patients, who have proved refractory to other non-invasive treatment.
Forms of percutaneous stimulation
A recent pilot study tested the efficacy of percutaneous electrical nerve stimulation of the occipital nerve in nine chronic CH patients. In total, six patients reported significant improvement, and in one case, reversion to episodic frequency of attacks was found [94]. The treatment was well tolerated with no significant adverse events.
Another retrospective study performed in twenty-one CH subjects refractory to other forms of treatment analysed the effects of percutaneous pulsed radiofrequency directed at the ganglion and/or nerve roots of the C1 and C2 levels [95]. The results of the study showed that a total of eleven patients reported some form of improvement in the 3 months following treatment and that no serious side effects were reported.
Further sham-controlled studies are required in the future to assess adequately the efficacy of these novel and promising forms of treatment.
Other therapies
OnabotulinumtoxinA
OnabotulinumtoxinA (OBTA) is a neurotoxin produced by clostridium botulinum that has been increasingly used in primary headaches. Its efficacy possibly involves a mechanism implicating the CGRP pathways, as revealed by a significant reduction of CGRP levels after 1 month of treatment in responsive patients with chronic migraine [96].
Its use as a preventive treatment in cluster headache has been investigated in three small open-label uncontrolled trials. Methods used in these trials varied considerably, including differences in doses, frequency of administration and injection site locations. Therefore, at the moment, the use of OnabotulinumtoxinA in cluster headache is not recommended [97]. In a recent study that followed the PREEMPT protocol, ten of seventeen refractory chronic CH patients treated with OBTA achieved a significant reduction in headache days [98], with mild side effects such as ptosis or a transient worsening in headaches.
Unilateral infiltration with OBTA 50 IU in the pericranial muscles [99] stopped the attacks of one out of nine patients with chronic CH and reduced the severity and intensity of two, with no benefit in the three episodic CH patients involved in the study, after 90 days. In this study, only one patient reported muscle weakness as a mild side effect.
A more invasive technique tested a stereotactically guided injection of the sphenopalatine ganglion (SPG) with OBTA, using a percutaneous or transnasal approach and a heterogeneous number of repeated procedures [100, 101]. In the follow-up after the initial study [100], a reduction in the frequency and severity of the attacks, as well as an increase in attack-free days, was seen in five out of the seven treated patients. However, this analysis was per protocol and in the pilot study, one patient presented a severe preoperative posterior epistaxis [101].
Future possibilities
Cluster headache causes pain levels that rank among the most severe known to humans. For this reason, advancements in the understanding of its basic biology, as well as therapeutic developments, are necessary and encouraged.
Gepants are small molecule CGRP receptor antagonists that could be administered orally. Heretofore, these have only been studied in migraine [74]. Ubrogepant [102] and rimegepant [103] have proven efficacy against placebo in the acute treatment of migraine and are well tolerated. The relevance of these drugs lies in the possibility of being used multiple times without the drawbacks of medication overuse headache. Rimegepant (NCT03732638) and atogepant (NCT03855137) are currently being explored as migraine preventives. The latter produced a significant reduction in migraine days [104]. One attractive development would be the intranasal gepant, vazegepant (BHV3500-201), that has reported a positive study in the treatment of acute attacks of migraine [105].
Ditans are oral selective 5-HT1F receptor agonists [106]. Lasmiditan inhibits nociceptive firing [107] and CGRP release [108] from the trigeminocervical complex, although it has until now solely been studied in migraine [109]. The lack of an effect in humans in vivo at 5HT1B/1D receptors of these drugs might result in fewer side effects related to vasoconstriction [110] with respect to triptans, which would be useful in a condition in which the majority of patients are male and smokers.
Pituitary adenylate cyclase-activating polypeptide-38 or PACAP 38 is elevated in the active phase of episodic CH [111]. This peptide is related to the production of nitric oxide, a gaseous molecule that plays an important role in the vasodilation involved in the pathogenesis of cranial autonomic symptoms [112]. It is produced by the parasympathetic nerves [113], mostly during nociceptive processing [114]. Furthermore, plasma nitrite levels are elevated among CH patients [115]. The inhibition of nitric oxide synthase (NOS) with non-selective and selective NOS inhibitors is being studied in migraine [114]. A recently published paper describes the potential role of the inhibition of PAC1, a PACAP-38 highly selective receptor, and the stimulus-evoked activity in the trigeminocervical complex in animal models [116]. Nonetheless, blocking the PAC1 receptor with AMG 301 did not show differences in patients with episodic migraine (NCT03238781).
Conclusions
Cluster headache is a primary headache characterized by complex pathophysiological mechanisms that have only partially been elucidated. In recent years, a greater understanding of the basic biology of primary headaches has provided researchers with the tools to target specific pathways and design bespoke clinical studies, paving the way for novel treatments for clinical practice.
CGRP is a key element in the cluster headache pathway; new pharmacological therapies aimed at blocking it, such as monoclonal antibodies, have proven to be efficacious and well tolerated. Emerging treatments for migraine, such as gepants or ditans, could be viable options for cluster headache patients burdened by other comorbidities and vascular risk factors. Furthermore, the possibility of acute medication to be taken ad libitum without the risk of side effects or overuse is rather attractive. Neuromodulation techniques targeting crucial structures for the pathophysiology of CH, such as the vagus nerve or the sphenopalatine ganglion, also represent well-tolerated preventive options.
Given the minimal amount of pharmacological interactions they present, a personalized combination of different novel therapies, targeting different elements involved in the nociceptive pathways, might well represent the future of treating cluster headache.
A broader knowledge of the mechanisms of chronification of cluster headache could help scientists and clinicians better understand the reason for refractory cases of the condition and optimize clinical benefit. Further studies are needed to understand the root of this relentless and extremely debilitating headache and to offer more adequate treatment strategies in the future.
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This paper represents independent research funded by the National Institute for Health Research (NIHR) Biomedical Research Centre at South London and Maudsley NHS Foundation Trust and King’s College London.
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Maria Dolores Villar-Martinez has no disclosures. Francesca Puledda has received honoraria from Teva UK. Peter J Goadsby reports, over the last 36 months, grants and personal fees from Alder Biopharmaceuticals, Aeon Biopharma, Allergan, Biohaven Pharmaceuticals Inc., Clexio, Electrocore LLC, eNeura, Epalex, Impel Neuropharma, MundiPharma, Novartis, Pfizer, Santara Therapeutics, Teva Pharmaceuticals, Trigemina Inc., WL Gore, and personal fees from MedicoLegal work, Massachusetts Medical Society, Up-to-Date, Oxford University Press, and Wolters Kluwer; and a patent magnetic stimulation for headache assigned to eNeura without fee.
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Villar-Martínez, M.D., Puledda, F. & Goadsby, P.J. Recent Advances in the Management of Cluster Headache. Curr Treat Options Neurol 22, 46 (2020). https://doi.org/10.1007/s11940-020-00655-z
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DOI: https://doi.org/10.1007/s11940-020-00655-z