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Table of Contents
REVIEW ARTICLE
Year : 2018  |  Volume : 21  |  Issue : 5  |  Page : 31-38
 

Short-lasting unilateral neuralgiform headache attacks


Headache Group, Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, UK

Date of Web Publication11-Apr-2018

Correspondence Address:
Dr. Manjit S Matharu
Headache Group, Institute of Neurology and The National Hospital for Neurology and Neurosurgery, Queen Square, London, WC1N 3BG
UK
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/aian.AIAN_356_17

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   Abstract 


Short-lasting unilateral neuralgiform headache attacks (SUNHA) is characterized by strictly unilateral trigeminal distribution pain that occurs in association with ipsilateral cranial autonomic features. There are two subtypes: short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing (SUNCT) and short-lasting unilateral neuralgiform headache attacks with cranial autonomic symptoms (SUNA). These disorders are rare but highly disabling. The management of SUNHA can be challenging. The abortive therapies are not generally useful as the attacks are relatively short-lasting. A myriad of pharmacological preventive treatments has been tried in single case reports or small series in an open-label fashion. Lamotrigine, as an oral preventive treatment, and lidocaine, as an intravenous transitional treatment, seems to be the most effective therapies. For medically intractable SUNHA, several surgical approaches have been tried. These include ablative procedures involving the trigeminal nerve or the Gasserian ganglion, microvascular decompression (MVD) of the trigeminal nerve, and neurostimulation techniques. MVD, occipital nerve stimulation, and ventral tegmental area deep brain stimulation have all been found to be effective in open-label series with relatively high-response rates. There is a considerable clinical, therapeutic, and radiological overlap between SUNCT, SUNA, and trigeminal neuralgia (TN). Despite being considered distinct conditions, the emerging evidence suggests a broader nosological concept of SUNCT, SUNA, and TN; these conditions may constitute a continuum of the same disorder, rather than separate clinical entities. Consideration needs to be given to classifying SUNHA with TN as a cranial neuralgia rather than as a trigeminal autonomic cephalalgia.


Keywords: Short-lasting unilateral neuralgiform headache attacks, short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing, short-lasting unilateral neuralgiform headache attacks with cranial autonomic symptoms, trigeminal autonomic cephalalgias


How to cite this article:
Levy A, Matharu MS. Short-lasting unilateral neuralgiform headache attacks. Ann Indian Acad Neurol 2018;21, Suppl S1:31-8

How to cite this URL:
Levy A, Matharu MS. Short-lasting unilateral neuralgiform headache attacks. Ann Indian Acad Neurol [serial online] 2018 [cited 2018 Dec 9];21, Suppl S1:31-8. Available from: http://www.annalsofian.org/text.asp?2018/21/5/31/229739





   Introduction Top


Short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing (SUNCT), which was first reported in 1978[1] and later described more fully,[2],[3] is characterized by short-lasting unilateral headache attacks accompanied by ipsilateral lacrimation and conjunctival injection.[4] In recognition of the possibility that all patients with generically the same condition might not have both conjunctival injection and tearing, the International Headache Society (IHS) Classification Committee suggested in 2004 that SUNCT syndrome may be a subset of a broader entity called SUNHA with autonomic symptoms (SUNA). In SUNA, only one cranial autonomic feature is sufficient to fulfill the diagnostic criteria.[5] The subsequent revision of the International Classification of Headache Disorders (ICHD-3 beta) in 2013, introduced the diagnostic category SUNHA with SUNCT and SUNA being considered subtypes of SUNHA.[4]


   Epidemiology Top


Both SUNCT and SUNA are rare headache syndromes, but the prevalence and incidence are uncertain. A study from Australia reported an estimated prevalence and annual incidence of 6.6 and 1.2/100,000, respectively.[6] In contrast, an epidemiologic study from Norway found two patients in a population of 1838, corresponding to the prevalence of 109 per 100,000.[7]

The typical age of onset is between 35 and 65, as seen in approximately two-thirds of primary SUNCT cases, but ranges from 5 to 88 years.[8],[9],[10] A systematic review found that the mean age of onset for SUNHA was approximately 48 years.[11] SUNHA has a male predominance. In a literature review published in 2013, with 222 cases (189 SUNCT, 31 SUNA, and 2 with both SUNCT and SUNA), the male-to-female ratio was 1.5:1.[11]


   Clinical Features Top


SUNCT and SUNA are characterized by sudden brief attacks of severe unilateral head pain in orbital, periorbital, or temporal regions, accompanied by ipsilateral cranial autonomic symptoms.[12]

Cranial autonomic symptoms

In SUNCT, the ipsilateral autonomic symptoms must consist of both conjunctival injection and lacrimation. In SUNA, the autonomic symptoms may include either conjunctival injection or lacrimation, but not both. Otherwise, the presence of cranial autonomic symptoms for SUNCT and SUNA is similar and may include nasal congestion, rhinorrhea, miosis, ptosis, eyelid edema, forehead and facial sweating and/or flushing, and a sensation of fullness in the ear.[4]

Site of pain

The pain in SUNCT and SUNA is unilateral and typically located in orbital, supraorbital, or temporal regions.[4],[12] A minority of patients with SUNCT and SUNA have pain in other cranial areas, including the top, side or back of head, the nose, trigeminal V2 and V3 regions, the teeth, the neck, and/or the ear.[12]

Duration, frequency, and temporal profile of individual attacks

In a series of 43 patients with SUNCT and 9 with SUNA, attacks could be categorized into one or more of three forms: single stabs of pain with a mean duration of 58 s (range 1–600 s); groups of stabs of pain with a mean attack duration of 396 s (range 10–1200); and “saw-tooth” attacks of continuous pain with multiple superimposed stabs and a mean attack duration of 1160 s (range 5–12,000).[12] Some patients had more than one of these different types of attacks, and there was wide inter-patient variation in the length of attacks and number of attacks per day. The ICHD-3 beta criteria [Table 1] for SUNHA specifies an attack length of 1–600 s, with an attack frequency of at least once a day for more than half the time when the disorder is active.[3]
Table 1: International Headache Society diagnostic criteria for short-lasting unilateral neuralgiform headache attacks

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Periodicity

SUNCT and SUNA are subclassified as episodic, with attacks occurring in periods lasting from 7 days to 1 year, separated by pain-free periods lasting at least 1 month; or chronic, with attacks occurring for more than 1 year without remission, or with remission periods lasting < 1 month. In a larger series of 52 patients with long follow-up, a chronic form was noted in 27 of 43 patients (63%) with SUNCT and all 9 patients with SUNA.[12]

Triggers

Multiple triggers have been associated with SUNHA.[2],[12] Some of the triggers described include touching the face or scalp, bathing or showering, washing or brushing hair, shaving, nose blowing, chewing or eating, brushing teeth, talking, coughing, exercise, and light (including sunlight and fluorescent lights). Neck movement may precipitate attacks in some patients or abort attacks in others.[2],[3],[13]

Patients can have a mixture of spontaneous and triggered attacks, but purely triggered attacks are rarely reported.[12] A potential explanation is that some cases of purely triggered attacks may have been incorrectly diagnosed as trigeminal neuralgia (TN). Thus, it is useful to recognize that occasional patients with SUNCT syndrome may experience only triggered attacks. In one of the larger series of 43 patients with SUNCT, a mixture of spontaneous and triggered attacks, purely spontaneous attacks, and purely triggered attacks occurred in 84, 14, and 2%, respectively.[12] A literature review, with data on trigger factors available for 176 patients, reported exclusively spontaneous attacks in 27%.[11]

Lack of refractory period

Unlike TN, SUNHA generally do not have a refractory period.[2],[8],[12] In a literature review, with pertinent data available for 93 patients with SUNHA, there was no refractory period in 90%.[11] In our series of 43 patients with SUNCT, spontaneous or triggered attacks could occur immediately after cessation of the previous attack in 41 patients (95%).[12] For SUNA, attacks without a refractory period were observed in eight of nine patients.

Interictal pain

Although not a classic symptom, background pain between attacks is sometimes present in patients with SUNHA. In one series, persistent background pain was present in 20 of 43 patients (47%) with SUNCT and 2 of 9 with SUNA.[12]

Neurologic examination

The neurologic examination is usually normal in patients with SUNHA, although ipsilateral trigeminal sensory findings are present in occasional patients. In our series, abnormal sensation to pinprick (mainly hyperesthesia) in trigeminal V1 or V2 distribution was present in 6 of 43 patients (14%) with SUNCT and 2 of 9 with SUNA.[12] Others have reported allodynia or hyperesthesia in the face,[2],[14] a sensory deficit of the trigeminal V1 region in a patient with post-traumatic SUNCT,[15] and a persistent ipsilateral Horner's syndrome.[16]


   Differential Diagnosis Top


The differential diagnosis for SUNHA includes other trigeminal autonomic cephalalgias (TACs) (i.e., cluster headache, paroxysmal hemicrania, and hemicrania continua); TN; primary stabbing headache; and secondary causes of SUNHA.

Trigeminal autonomic cephalalgias

In cases where attacks appear to be prolonged, the main alternative diagnostic considerations are paroxysmal hemicrania and cluster headache. In cases of constant interictal pain, the main alternative diagnostic consideration is hemicrania continua. The clinical features of these TACs are outlined in [Table 2].
Table 2: Clinical features of the trigeminal autonomic cephalalgias

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Trigeminal neuralgia

Differentiating SUNHA from TN can be challenging in some cases, as there is a considerable overlap in the clinical phenotypes of the two syndromes. Both headaches are short-lasting, can have a high frequency of attacks and display clustering of attacks. Both are principally unilateral headaches and the trigger zones behave similarly. The usual onset is during middle or old age in both. However, there are a number of differences between these two syndromes [Table 3], awareness of which can aid in their differentiation.
Table 3: Differentiating features of short-lasting unilateral neuralgiform headache attacks and trigeminal neuralgia

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Primary stabbing headache

Primary stabbing headache refers to brief, sharp, or jabbing pain in the head that occur either as a single episode or in brief repeated volleys. The pain is usually over the ophthalmic trigeminal distribution, whereas the face is generally spared. The pain usually lasts a fraction of a second but can persist for up to 1 min, thereby overlapping with the phenotype of SUNCT, and recurs at irregular intervals (hours to days). These headaches are generally easily distinguishable clinically as they differ in several respects in primary stabbing headache, there is a female preponderance; the site and radiation of pain often varies between attacks; the attacks occur spontaneously; cranial autonomic features are absent; and the attacks commonly subside with the administration of indomethacin.[4]

Secondary short-lasting unilateral neuralgiform headache attacks

SUNHA is usually a primary headache disorder. However, there are several cases that are potentially secondary to intracranial lesions, typically located either in the posterior fossa or in the pituitary gland, as described below. In addition, there are case reports of SUNHA following viral meningitis or meningoencephalitis [17],[18] and traumatic head injury.[15],[19] There is also a report of SUNCT secondary to an infraorbital metastatic bronchial carcinoid.[20]

Posterior fossa lesions

Reports of SUNCT or SUNA associated with a posterior fossa abnormality include the following cases ipsilateral cerebellopontine arteriovenous malformation,[21],[22] brainstem cavernous hemangioma,[23] posterior fossa lesion associated with HIV/AIDS,[24] severe basilar impression causing pontomedullary compression in a patient with osteogenesis imperfecta,[25] craniosynostosis resulting in a foreshortened posterior fossa,[26] brainstem infarction,[27],[28] pilocytic astrocytoma expanding to the trigeminal root entry zone,[29] parietal and parieto-occipital space-occupying lesions,[12] pathologic white matter lesions associated with multiple sclerosis,[30] and vertebral artery dissection.[31] These posterior fossa abnormalities emphasize the absolute need for a cranial magnetic resonance imaging (MRI) in any suspected case of SUNHA.

Pituitary lesions

SUNCT has been described in patients both with microadenomas and macroadenomas, with attacks occurring on the side ipsilateral to the side of the tumor.[12],[32],[33] In most cases, the pituitary adenomas associated with SUNCT have been prolactin or growth hormone-secreting tumors. Headache symptoms can precede pituitary symptoms by 3–10 years.

The ipsilateral localization of a headache suggests a role for a direct mode of action in pituitary macroadenomas, but this mechanism would not account satisfactorily for microadenomas. An alternative hypothesis is that the attacks are mediated predominantly by a neurohormonal mechanism rather than by the size or invasiveness of the tumor.[33],[34]

Trigeminal neurovascular loop

Emerging evidence supports the frequent occurrence of vascular compression of the trigeminal nerve close to the root entry zone ipsilaterally to the side of the pain in SUNHA. In a series of 24 SUNHA cases, 17 patients were studied with dedicated MRI imaging of the trigeminal nerves. Neurovascular compression was detected in 15 of 17 patients (88%). In 90% of cases, a vascular loop was impinging the symptomatic trigeminal nerve, compared to only 7% in which the vascular loop was pressing on the asymptomatic nerve,[6] suggesting that this finding was more than a mere chance association. An earlier series had reported that only 7% patients had trigeminovascular loops, but patients were not investigated systematically with dedicated trigeminal scans in that series.[12] Should trigeminal neurovascular conflict be confirmed in a larger sample of patients, it would support an etiological overlap between SUNCT, SUNA, and TN; TN is known to be caused by a neurovascular conflict with the trigeminal nerve in 52%–88% of patients.[35]

These findings raise the possibility that peripheral mechanisms play a key role in the pathophysiology of SUNCT.[36] In addition, some patients with SUNHA may benefit from trigeminal microvascular decompression (MVD), thereby underlining the importance of dedicated trigeminal nerve imaging.


   Diagnostic Workup Top


As SUNHA can be secondary to underlying structural pathology, including pituitary tumours, posterior fossa lesions, and trigeminal neurovascular conflict, it is recommended that the brain MRI with pituitary and trigeminal views as well as blood tests for pituitary function should be a minimal workup for SUNHA, even if there are no unexplained neurologic abnormalities on examination. In terms of therapeutic trials, SUNHA may be differentiated from paroxysmal hemicrania and hemicrania continua by the lack of response to indomethacin. An indomethacin challenge should, therefore, be considered in patients with prolonged SUNHA attacks and those who have interictal pain.


   Pathophysiology Top


Any pathophysiological construct for SUNHA should account for its major clinical characteristics. It has been proposed that some of the clinical features of SUNHA, namely, the occurrence of pronounced cranial autonomic symptoms with the pain, involves a central disinhibition of the trigemino-autonomic reflex,[24] similar to the other TACs.[37] The cerebral structure implicated in the disinhibition mechanism is thought to be the posterior hypothalamus, known to have a modulatory role in the nociceptive and autonomic pathways, specifically the trigeminovascular nociceptive pathways.[38] Functional neuroimaging studies have showed activation of the posterior hypothalamus during SUNCT/SUNA attacks,[39],[40] supporting its paramount role in these disorders.

However, many clinical features of SUNHA, namely, duration, frequency, and character of the pain, along with the presence of cutaneous triggers overlap with TN. These similarities along with the high proportion of patients demonstrating trigeminal neurovascular conflict ipsilaterally to the side of the pain support the notion that more peripheral mechanisms may be involved in the complex pathophysiological mechanisms of this disorder.[35] This implies that SUNCT and SUNA may also share pathogenic mechanisms with TN, namely, a demyelination of the trigeminal sensory root due to vascular compression. This abnormality would be responsible for the short-lived painful paroxysms, and it would also be responsible for the ephaptic cross-talk between fibers that drive sensation and nociceptive fibers, explaining the triggerability of the attacks in some SUNCT and SUNA patients.

SUNCT, SUNA, and TN may be attributable to a unifying pathophysiological model characterized by different degrees of interaction between peripheral and central mechanisms, namely, focal demyelination of the trigeminal sensory root and posterior hypothalamic dysfunction. Central mechanisms may be more pronounced in patients with at least two cranial autonomic symptoms and less pronounced in patients with one or no autonomic symptoms.


   Medical Management Top


Abortive treatments

Since the attacks are very short-lasting, attack therapy strategies are not useful in SUNHA. There is no available abortive treatment for the individual attacks.

Preventive treatments

Lamotrigine

Before the use of lamotrigine, SUNHA was considered to be highly refractory to medical treatments. Lamotrigine may be the most effective preventive treatment and is considered the drug of choice for the preventive treatment of SUNHA.[41] In a case series of 29 patients, treatment with lamotrigine (up to 600 mg daily) was associated with moderate to good response in 18 patients (62%), including 17 of 25 patients with SUNCT and 1 of 4 patients with SUNA.[40]

Topiramate

Topiramate may be useful as a preventive medication for SUNHA. In a case series of 22 patients, treatment with topiramate (up to 400 mg daily) was associated with a good response in 11 (50%).[40]

Gabapentin

Gabapentin may useful as preventive therapy in SUNHA. In a series of 27 SUNHA patients, treatment with gabapentin (up to 3600 mg daily) was associated with a good response in 13 (48%).[40] An open-label study of gabapentin (up to 900 mg daily) reported complete remission of SUNCT attacks in five of eight patients.[42]

Carbamazepine

The therapeutic response to carbamazepine has been reported in 33 cases. In 22 of 33 patients (67%), there was no beneficial response with the sole use of carbamazepine. Among the 11 patients with a favourable response, eight of the 33 patients had a partial response, and three had a complete or almost complete response.[8] In an open-label series of 36 SUNCT and five SUNA patients treated with carbamazepine, 40% of SUNCT and 20% of SUNA patients reported a favorable response.[40]

Other drugs

Several other medications, alone or in combination, have been employed to treat SUNHA, including oxcarbazepine, clomiphene, valproate, verapamil, lithium, zonisamide, and onabotulinum toxin A injections. Given the sparse data available on these drugs, it is difficult to comment on their efficacy.

Transitional treatments

There can be a lag of several days to a few weeks before the efficacy of preventive treatments becomes apparent. Transitional treatments, which produce a rapid suppression of the attacks for a limited period, can be used when waiting for the beneficial effect of a preventive treatment to become evident.

Intravenous lidocaine

The administration of intravenous (IV) lidocaine was highly effective at completely suppressing the headaches in four patients with SUNCT.[43] Subsequently, 11 SUNCT and four SUNA patients reported a favorable outcome during the administration of IV lidocaine at the dose of 1.5–3.5 mg/kg/h.[40] Given the quick and dramatic, but often short-lasting effect in most SUNHA patients, it is advisable to use IV lidocaine as a short-term treatment in patients who present with a severe exacerbation or “status” and also to avoid breakthrough attacks while switching from a preventive drug to another in patients with high load of attacks. Our protocol consists of using IV lidocaine ranging from 1.3 to 3.3 mg/kg/h for 7–10 days. Twenty-four hours electrocardiography monitoring is mandatory during the infusion.

Greater occipital nerve blocks

A suboccipital injection of a combination of lidocaine and a steroid was beneficial in five out of eight SUNCT patients.[40] Greater occipital nerve injections (GONIs) may render the patient pain free for weeks or months, allowing the introduction and dose escalation of preventive medications.

Corticosteroids

The response to corticosteroids has been reported in 21 patients. Eleven patients were administered prednisone, and eight patients were administered prednisolone or methylprednisolone. Corticosteroids were given to two patients, but the specific agent used was not stated. Six of the 11 patients taking prednisone reported a beneficial response. Six of the eight patients taking prednisolone or methylprednisolone reported a favourable effect.[8],[44],[45]

Queen Square experience

The results of the largest open-label study in the medical treatment of SUNCT and SUNA have been recently reported.[46] The authors assessed the outcome of several preventive and transitional treatments prospectively administered in an open-label fashion in 62 SUNCT and 50 SUNA patients. No significant differences in treatment responses were noticed between SUNCT and SUNA; therefore, SUNCT and SUNA patients were considered together when results were reported. Lamotrigine was effective in 67% of patients treated (n = 59/88 patients), topiramate in 44.4% (n = 24/54 patients), gabapentin in 27.8% (n = 17/61 patients), and carbamazepine in 45.6% (n = 26/57 patients), the latter providing a partial response in most patients who reported a benefit. Oxcarbazepine was beneficial in 59% of patients (n = 20/34 patients), whereas the percentage of patients successfully treated with pregabalin was the same as those treated with gabapentin (28%; n = 12/43 patients); mexiletine was beneficial in 55.6% of patients (n = 5/9 patients) though the tolerability profile of this drug was poor. Remarkably, duloxetine was beneficial in 39% of patients (n = 5/13 patients). The majority of patients treated with lamotrigine, oxcarbazepine, topiramate, and duloxetine, reported a good-to-excellent benefit. Among transitional treatments, IV lidocaine rendered 87% of patients (n = 29/31 patients) pain-free, though the pain tended to recur rapidly when treatment was stopped for most of them. A GONI using a mixture of methylprednisolone 80 mg and lidocaine 2% 2 ml was effective in 35.7% (n = 20/56 patients), for a median of 14 days (range: 1–150 days).

[Table 4] shows a proposed algorithm of medical treatment of SUNCT and SUNA, based on the open-label literature evidence.[46]
Table 4: Proposed algorithm for medical treatment of short-lasting unilateral neuralgiform headache attacks

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   Surgical Management Top


Several surgical approaches have been tried in SUNHA. The approaches attempted can be subdivided into three main groups: ablative procedures of the trigeminal nerve, MVD of the trigeminal nerve and neurostimulation techniques.

Ablative procedures of the trigeminal nerve

Procedures that have been tried in SUNCT syndrome include percutaneous trigeminal ganglion compression,[47] trigeminal ganglion thermocoagulation,[48],[49] retrogasserian glycerol rhizolysis,[48],[50] and gamma-knife surgery.[51] Isolated case reports have suggested a potential effectiveness of these treatments. On the other hand, patients who had a poor outcome from these procedures have also been reported.[43],[48] Adverse events of these procedures include hypoesthesia, keratitis, and anesthesia dolorosa, which can be a highly disabling complication though very rare. In view of the sparsity of data on the efficacy of these procedures taken together with the complications, these procedures are best avoided for now.

Microvascular decompression of the trigeminal nerve

Williams and Broadley, who systematically looked for trigeminal neurovascular conflict with dedicated trigeminal MRI scans, found a high proportion of ipsilateral vascular loops in contact with the trigeminal nerve in SUNCT and SUNA (88%, n = 15/17).[6] This supported the notion of MVD being a potential treatment for these conditions. To date, ten cases and a case series of nine patients with medically intractable SUNHA, who underwent MVD of the trigeminal nerve, have been reported.[36],[48],[52],[53],[54],[55],[56] After a median follow-up of 14 months (range: 0.5–32 months), 12 of 19 (63%) of cases were pain-free, whereas in the remaining patients, the procedure had little or no effect. Two patients suffered from persistent complications, such as ataxia and hearing loss, whereas in five cases transient complications were noted. Although series with longer follow-up would be ideal to assess the long-term efficacy of MVD for refractory chronic SUNHA, this approach can nonetheless be considered in patients with ipsilateral trigeminovascular conflict, though possible benefit should be weighed against operation-related risks of permanent neurological deficits.

Peripheral and central neurostimulation

Occipital nerve stimulation

Miller et al. recently presented the long-term outcome of 31 medically intractable SUNHA patients treated with occipital nerve stimulation (ONS).[57] At a median follow-up of 45 months (range 13–89 months), there was a 69% improvement in attack frequency with a response rate (defined as at least a 50% improvement in daily attack frequency) of 77%. Attack severity reduced by 4.7 points on the verbal rating scale and attack duration by a mean of 64%. Battery failure or voluntary stimulator switch-off were followed by recurrence or worsening of the attacks within few days in most of the patients. Adverse event rates were favorable, with no electrode migration or erosion reported, and only one patient (3%) suffering a superficial wound infection requiring medical management only.

Deep brain stimulation of the ventral tegmental area

In view of the functional imaging evidence of posterior hypothalamus region activation in TACs including SUNHA [39] and the previous reports on deep brain stimulation (DBS) of this region, now understood to be the ventral tegmental area,[58] for medically refractory cluster headache, this treatment strategy has been tried in medically intractable chronic SUNHA. In an open-label prospective study, eleven patients underwent ipsilateral ventral tegmental area DBS. Median follow-up was 29 months (range 7–63). At final follow-up, the median improvement in daily attack frequency was 78%. Response rate (defined as at least a 50% improvement in daily attack frequency) was 82%, and four patients were rendered pain free for prolonged periods of time. Headache load (a composite score of attack frequency, severity, and duration) improved by 99%. Adverse events included mild-incision site pain, subcutaneous displacement of the implantable pulse generator, transient oscillopsia, and minor wound infection. One patient required removal of the system due to wound infection.

Overview of surgical treatments

MVD, ONS and DBS have all been found to be effective in open-label series with relatively high response rates. The invasiveness of surgery, associated risks, the need for implanted hardware and the cost of treatment will all influence individual patient options. With these in mind, we recommend that patients with medically-intractable SUNHA first undergo MVD if they have ipsilateral neurovascular compression of the trigeminal nerve, that ONS be reserved for those without neurovascular compression or failing MVD and DBS (as the most invasive neuromodulation option) be left as an option when patients have failed all other procedures.


   Nosological Status of Short-Lasting Unilateral Neuralgiform Headache Attacks Top


SUNCT, SUNA, and TN are considered different disorders and thus are grouped in separate sections of ICHD-3 beta. However, data on the clinical phenotype and effective management strategies in SUNCT and SUNA have shown striking similarities with TN. Moreover, studies exploring radiological findings support the hypothesis of common etiological and pathophysiological basis between SUNCT/SUNA and TN, with trigeminal neurovascular conflict in significant proportions of these patients. Hence, despite being considered distinct conditions, emerging clinical and radiological evidence support a broader nosological concept of SUNCT, SUNA, and TN.[35] These conditions may constitute a continuum of the same disorder, rather than separate clinical entities. In view of this, consideration needs to be given to classifying SUNHA with TN as a cranial neuralgia rather than as a TAC.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
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  [Table 1], [Table 2], [Table 3], [Table 4]



 

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    Abstract
   Introduction
   Epidemiology
   Clinical Features
    Differential Dia...
   Diagnostic Workup
   Pathophysiology
   Medical Management
   Surgical Management
    Nosological Stat...
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