Brain Advance Access originally published online on March 26, 2004
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Brain, Vol. 127, No. 5, 1200-1209, 2004
© 2004 Guarantors of Brain
doi: 10.1093/brain/awh146
A meta-analysis for headache in systemic lupus erythematosus: the evidence and the myth
1 Athens Naval Hospital, Department of Neurology, Headache Clinic, 2 First Department of Propedeutic Medicine, Athens University Medical School, Laikon Hospital, Athens, Greece and 3 The National Hospital for Neurology and Neurosurgery, Institute of Neurology, Queen Square, London, UK
Correspondence to: Dimos D. Mitsikostas, MD, PhD, Athens Naval Hospital, Department of Neurology, 77A Vas. Sofias Avenue, 115 21 Athens, GreeceE-mail: dmitsikostas{at}ath.forthnet.gr
| Summary |
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Controversies in the occurrence and implications of headache in patients suffering from systemic lupus erythematosus (SLE) triggered us to conduct an extensive literature search in order to answer five clinical questions. (i) Is headache prevalence higher in SLE patients than in the general population? (ii) Is lupus headache a separate entity? (iii) Is there a distinct pathogenetic mechanism of headache in SLE? (iv) Is headache related to CNS involvement or general SLE activity? (v) Is headache related to anxiety- and depression-like symptoms in SLE? All published articles reporting data from >30 SLE patients were classified into four classes (I, IIa, IIb and III) by the quality of their evidence. We found no prospective controlled study (class I), but we identified seven controlled (class II) and 28 uncontrolled studies (class III) that retrospectively investigated the occurrence of headache in SLE patients. Eight out of 35 studies applied the International Headache Society (IHS) criteria for headache classification, whereas only four uncontrolled studies investigated paediatric SLE populations (class III). Pooled data from eight studies (controlled and uncontrolled) that used the IHS criteria show that 57.1% of SLE patients reported any type of headache (migraine 31.7% and tension-type headache 23.5%). Pooled data from seven controlled studies showed that the prevalence of all headache types, including migraine, was not different from controls. Insufficient evidence was found for the concept of lupus headache. No particular pathogenetic mechanism of headache in adult SLE patients has been identified, nor an association between headache and the disease status, including CNS involvement. There is no good evidence that headache is associated with anxiety and depression in SLE. Insufficient data (class III) do not allow safe conclusions for headache among paediatric SLE patients. These findings suggest that the occurrence of headache in adult SLE patients does not itself require further investigation and that headache in those patients should be classified according to IHS criteria and managed as primary headache if there is no specific indication of a role for SLE in the patient. These recommendations should be verified by a properly controlled and prospective study in both adult and paediatric populations.
Key Words: headache; migraine; systemic lupus erythematosus
Abbreviations: aCL= anticardiolipin antibody; IHS = International Headache Society; SLE = systemic lupus erythematosus; TTH = tension-type headache
Received November 14, 2003. Revised January 9, 2004. Accepted January 10, 2004.
| Introduction |
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Clinical observations since the 1970s have suggested an association between primary headaches and systemic lupus erythematosus (SLE). In the first study that appeared in the literature, brain involvement in SLE was not associated with headache (Atkinson and Appenzeller, 1975
The American College of Rheumatology recently published the nomenclature and case definitions for neuropsychiatric SLE (American College of Rheumatology, 1999
), where headaches, although non-specific, were considered as a part of the clinical spectrum of SLE. Three previous studies have been published indicating that migraine is indeed associated with SLE (Ainiala et al., 2001
a; Glanz et al., 2001
; Brey et al., 2002
), whereas in another no association was found (Omdal et al., 2001
). These recently published studies with contradictory findings triggered us to review critically available published data to attempt to clarify whether primary headaches occur more frequently in SLE patients than in the general population and, if they do, which particular type of headache is the most frequent. We further aimed to search for scientific evidence indicating a particular pathogenetic mechanism for headaches seen in SLE patients. If so, then the term lupus headache should clearly be established and used in clinical practice, otherwise it may have no use. We also searched for possible association of headache with either CNS involvement in SLE (neuro-SLE) or with SLE disease activity. If there is such an association, then headaches could serve as either an early clinical sign of neuro-SLE, as a clinical indication for laboratory CNS investigation, or both. Apart from these major objectives, we also addressed a possible relationship of headache in SLE to Raynauds phenomenon, or aCLs in the context of SLE. Thus, the aims of the review were to answer the following questions. (i) Is headache prevalence higher in SLE patients than in the general population? (ii) Is lupus headache a separate entity? (iii) Is there evidence for a distinct pathogenetic mechanism of headache in SLE? (iv) Is headache related to CNS involvement or general SLE activity? (v) Are headaches related to anxiety- and depression-like symptoms in SLE?
| Methods |
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We conducted an extensive Medline/PubMed and EMBASE search, using as keywords headache and lupus, or migraine and lupus (by December 2002). All reports published in any language were reviewed and classified according to criteria presented in Table 1. From all scanned studies, no controlled prospective study was found (class I), but seven retrospective controlled studies were identified (class II) (Isenberg et al., 1982
2 tests were applied to detect significant differences between groups. These analyses were restricted to class IIa studies. In studies that did not use IHS criteria, it was not clear if all SLE patients with headache and CNS involvement should be considered to have primary or secondary headaches. We decided to consider those headaches under the term all headache types. Data from one Finish survey were published twice, once as a case-controlled study (Ainiala et al., 2001
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| Results |
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Is headache prevalence higher in SLE patients than in the general population?
We considered only class I or II studies could answer this question. Among class II studies, one did not address this issue, aiming to search for a possible relationship between migraine and aCLs (Montalban et al., 1992
Tension-type headache prevalence in SLE
Tension-type headache (TTH) is the most frequent primary headache syndrome in the general population (Rasmussen, 2001
). Three class IIa studies reported data on TTH (Goh et al., 1997
; Fernandez-Nebro et al., 1999
; Ainiala et al., 2001
b) and none reported significant association with SLE. Pooled data from these studies show that 39 out of 167 SLE patients, versus 35 out of 167 controls, reported TTH headaches (
2, not significant). Thus, based on available class IIa studies, there is no evidence for higher prevalence of TTH in SLE. Among class III studies, the TTH prevalence varies from 1.9 (Mok et al., 2001
) to 32.9% (Vazquez-Cruz et al., 1990
). Considering data from all IHS-based studies, TTH prevalence is 23.5% (Fig. 1). There is some evidence that TTH may be less frequent in SLE patients than in the general population, or that TTH may occur less often than migraine in these patients, in contrast to the general population. The average prevalence of TTH is 23.5% versus 31.7% for migraine, in IHS-based studies (Fig. 1). In only one class IIa, study the TTH prevalence was higher than that of migraine, but it was also higher than in the control group (Ainiala et al., 2001
b). The sample size was limited in the latest study to 46 participants from the general population. Apart from this, and considering the overall prevalence of TTH, both class II and class III studies do not provide evidence for a particular change in the TTH prevalence among SLE patients.
Migraine prevalence in SLE
The prevalence of migraine in SLE patients seems more complicated. Two class II studies either did not report migraine data (Sfikakis et al., 1998
) or the control group consisted of migraineurs but without SLE (Montalban et al., 1992
), thus offering no insight into this issue. Among class IIa studies that showed data on migraine (Goh et al., 1997
; Fernandez-Nebro et al., 1999
; Ainiala et al., 2001
b), one reported a significant association between migraine and SLE (Ainiala et al., 2001
b), but that was not confirmed by the other two studies (Goh et al., 1997
; Fernandez-Nebro et al., 1999
). When we pooled data from these studies, migraine prevalence was 42 cases out of 167 SLE patients versus 36 cases out of 167 controls (
2, not significant). In class IIb studies, a significant association between migraine and SLE was found (Isenberg et al., 1982
; Markus and Hopkinson, 1992
), the migraine prevalence in SLE patients being almost twice that of controls. Since a clear definition of migraine is crucial in such studies, we have assigned the results of class IIb studies much less weight. In class III studies, migraine prevalence varies from 3.1 to 45% (Rozell et al., 1998
; Mok et al., 2001
). Migraine with or without aura does not seem to differ between SLE patients and controls in these studies. One class IIa study showed that migraine with aura in SLE was higher (26%) than in the general population (10.8%) (Ainiala et al., 2001
b). The authors did not provide an analysis of this finding. In addition, pooled data from IHS-based studies revealed a significant increase of migraine with aura prevalence in SLE patients (15 cases versus six in controls out of 115 observations; Table 4). The small number of cases limits the value of this finding. In other class III studies, migraine with aura was very frequent, reaching 42% (Brey et al., 2002
) and 44% (Glanz et al., 2001
) of SLE patients. Although selection bias may have influenced the uncontrolled studies, these observations suggest important issues with possible implications.
Conclusion
The prevalence of all headache types, particularly of TTH and of migraine, does not differ between SLE patients and controls (class IIa evidence). However, migraine with aura may be more frequent among SLE patients. Further investigation on this matter is needed.
Is lupus headache a separate entity?
In four class III reports, the term lupus headache was used (Vazquez-Cruz et al., 1990
; Steinlin et al., 1995
; Menon et al., 1999
; Omdal et al., 2001
), but without a clear definition. Among 48 adult SLE patients, one reported severe lupus headache in the first screening, whereas in the second assessment 12 or 18 months later, four patients reported such headaches (Menon et al., 1999
). In another uncontrolled study that used the IHS criteria, the participants did not report lupus headache; one headache case was unclassifiable. The authors mentioned that lupus headache contributes to a severe, disabling, persistent and not responsive to narcotic analgesics headache. No such phenotype was found among the 58 patients they investigated specifically for headaches (Omdal et al., 2001
), nor did any class IIa study identify any headache case with these characteristics. In a study in children, nine lupus headaches out of 91 patients (22%) were reported (Steinlin et al., 1995
). The authors describe these headaches as intractable and severe, not responding to treatment, but without any other detailed description (Steinlin et al., 1995
). All these children had CNS manifestations of SLE; thus these headaches may not have been primary.
Conclusion
Not enough evidence (only class III) is available in the literature regarding the term lupus headache, and therefore no safe conclusion could be made.
Is there a distinct pathogenetic mechanism of headache in SLE?
Since there are no data from class IIa studies indicating a different prevalence of headaches in SLE patients from that in the general population, this question is moot. The issue has been addressed in the past because it was considered that headache was more common in patients with SLE. In a retrospective class III study (Atkinson and Appenzeller, 1975
), the files of 61 SLE patients were reviewed; 27 (45%) suffered from headaches classified by older criteria with 13 of vascular and nine of muscle contraction type. The primary aim of the investigators was to explore the hypothesis that small vessel disease may contribute to headache pathogenesis, so they looked for a possible association between CNS involvement and headache frequency. They did not find such a relationship and concluded that headache in SLE patients without neurological symptoms or signs does not indicate CNS involvement, and that small vessel disease within the brain without inflammation cannot count as a cause of headache (Atkinson and Appenzeller, 1975
). In a study not included in the analysis because of the small sample size, 11 SLE patients with headache and visual hallucinations typical of those found in migraine were reported (Brandt and Lessell, 1978
). The authors concluded that migraine-like phenomena, such as visual hallucinations, might arise as a result of vascular dysfunction in SLE. These symptoms were typical of visual aura (fortification spectra) and responded to therapy with both corticosteroids and ergotamine or aspirin (Brandt and Lessell, 1978
). In a subsequent brief report, it was found that 34 out of 83 SLE patients complained of various types of headache, 25 (30%) of whom were classified as migraineurs (non-IHS criteria). They suggested that in a minority of cases (4% of headache sufferers), SLE triggered migraine that was indistinguishable from idiopathic migraine, while in 13 SLE patients (17%) headache was caused directly by SLE. The criterion used to obtain this different influence of SLE in migraine was the family history for headaches. If it was present, they speculated that SLE triggered migraine, if not, then SLE caused de novo migraine (Anzola et al., 1988
). While such a genetic basis is attractive in theory, no clear evidence for this approach was provided. On the other hand, it has been emphasized that when migraine is assessed by proband report, it is not satisfactory for diagnosing migraine in relatives and that direct clinical interview of the affected relatives is necessary in family studies of migraine (Russell et al., 1996
). Beyond these class III studies, no other reports have attempted to clarify this point.
Conclusion
There is no scientific evidence to support a particular mechanism for headache pathogenesis in SLE patients (class III evidence).
Is headache related to CNS involvement or general SLE activity?
To answer this question, we first looked for epidemiological data. Studies in adults reported headache prevalence that varied from 4 to 14.3% of neuro-SLE cases. Only six studies, however, looked specifically for a possible association between headaches and neuro-SLE features. In the only class IIa study, no significant association was identified between neuro-SLE clinical features and any headache type (Sfikakis et al., 1998
). Among the class III studies, three documented a significant relationship (Vazquez-Cruz et al., 1990
; Amit et al., 1999
; Banecka-Majkutewicz, 1999
) and two did not (Atkinson and Appenzeller, 1975
; Rozell et al., 1998
). In another class IIb study (Weiner et al., 2000
) not included in our analysis because of the limited number of patients, 28 SLE patients were evaluated with brain MRI and PET and compared with 10 healthy volunteers. Headache was considered as a sign of mild CNS involvement, together with depression, anxiety, cognitive dysfunction and anxiety disorders. All patients with either severe or mild neuro-SLE showed hypometabolism in PET scans, as compared with two out of five patients without neuro-SLE (P < 0.0025). Limitations in the sample size and the heterogeneity of the CNS symptoms in SLE patient groups do not allow safe conclusions regarding headache or migraine. Brain H-MRS scans in patients with neuro-SLE revealed abnormalities in N-acetylaspartate, as compared with controls, but again the study was not focused on headache or migraine (Sibbitt. et al., 1997
). Neuroimaging studies in migraineurs have also shown abnormalities, in migraine with aura in particular (Ferbert et al., 1991
; Igarashi et al., 1991
; Osborn et al., 1991
; Fazekas et al., 1992
; De Benedittis et al., 1995
), as well as in SLE patients with CNS involvement (Bosma et al., 2000
), although not all studies found abnormalities (Gonzalez-Crespo et al., 1995
). It is noteworthy that children with SLE seem different. When we pooled data from studies in paediatric populations, we found that headaches (not classified) were reported by 34% of patients with neuro-SLE (Steinlin et al., 1995
; Quintero-Del-Rio and Van Miller, 2000
), whereas when we pooled data from adult SLE patients, the headache prevalence (all headaches) was calculated at 8.3% (Rood et al., 1999
; Mok et al., 2001
). This was a significant difference between children and adults.
Among the studies identified, only two showed that headache was related to general SLE activity. One was a class IIb study (Markus and Hopkinson, 1992
) and the other class III (Amit et al., 1999
). All other studies (Vazquez-Cruz et al., 1990
; Sfikakis et al., 1998
; Banecka-Majkutewicz, 1999
; Fernandez-Nebro et al., 1999)
, controlled and uncontrolled, agreed that there was no such association. Regarding other SLE features, most studies were focused on the presence of aCLs, and all agree that there is no such association (Markus and Hopkinson, 1992
; Montalban et al., 1992
; Tsakiris et al., 1993
; Sfikakis et al., 1998
; Fernandez-Nebro et al., 1999
), with one exception (Cronin et al., 1988
). However, in another class IIb study, aCL was found to be elevated in the CSF of SLE patients with lupus headache. In the same study, aCL within the CSF was associated further with acute psychosis, cognitive impairment, high cortical dysfunction and altered consciousness. The authors suggested that intrathecal diffusion rather than the diffusion of immunoglobulin G aCL from serum to CSF occurred in those SLE patients with CNS involvement (Lai and Lan, 2000
). These findings deserve further evaluation. Other manifestations were also investigated, such as Raynauds phenomenon and anti-ganglioside antibodies. For Raynauds phenomenon, no association was proven (class IIb) (Vazquez-Cruz et al., 1990
; Glanz et al., 2001
), whereas immunoglobulin G anti-ganglioside antibody was related to migraine in a large multicentre cohort study (class IIb) (Galeazzi et al., 2000
). Genetic analysis of a Dutch family with autosomal dominant vascular retinopathy, migraine and Raynauds phenomenon revealed significant evidence of linkage to chromosome 3p21 (Terwindt et al., 1998
; Ophoff et al., 2001
). The significance of these findings remains unclear. The onset of headaches may be related to the onset of SLE, although there are contradictory results on this issue: in one controlled study, there is indeed an association (Fernandez-Nebro et al., 1999
), but this was not confirmed by two other class IIa studies (Goh et al., 1997
; Sfikakis et al., 1998
). It is appropriate to mention that apart from SLE, other chronic disease could evoke headaches, but no such association has been shown for the case of SLE (Goh et al., 1997
). All studies examining this question used a retrospective methodology, e.g. the patients felt that they had more or fewer headaches, thus limiting their value. It seems, therefore, that there is no established association between the onset of SLE and the frequency, and even more the onset, of headache. In a recent paper not included in our analysis (Brunner et al., 2003
), headaches reported by children with SLE were unlikely to be associated with disease activity.
Conclusion
In adults, there is no established association between neuro-SLE clinical features and any headache type (class IIa evidence). In contrast, for children, there is class III evidence supporting a possible association between CNS involvement and headache. Further investigation is needed. Headache is not related to SLE activity and serum aCL, or to Raynauds phenomenon (class II evidence). There is class IIb evidence that headache is related to the presence of aCL in the CSF, or with anti-ganglioside antibody in serum. These findings deserve further investigation.
Is headache related to anxiety- and depression-like symptoms in SLE?
It is speculated that headaches in SLE may be associated with anxiety- and depression-like symptoms (Goh et al., 1997
; Sfikakis et al., 1998
). In one study, 59% of SLE headache patients reported two or more symptoms of stress (unspecified) compared with 18.2% of the SLE-non-headache patients (
2 = 5.71, P = 0.0017) (Goh et al., 1997
). Applying the Hamilton rating scales for anxiety and depression in all SLE headache patients, it was reported that most of them complained of anxiety- and depression-like symptoms (73% had a score >14 in the scale for anxiety and 60% for depression) (Sfikakis et al., 1998
), but the authors did not apply these scales to a suitable control group. Looking specifically at the psychological profile of those SLE patients that report headache, it was noted that migraine was associated with a tendency to social isolation and anxiety, while TTH was associated with psychological distress, such as somatic complaints, reduced energy, mental tension, social discomfort and withdrawal, as well as depressive mood (Minnesota Multiphasic Personality Inventory and Beck Depression Inventory). Although the study was not controlled, the authors suggested that these are the characteristics usually seen in migraine and TTH outside SLE, and thus migraine and TTH may not be considered as part of the neuropsychiatric disease spectrum (Omdal et al., 2001
). Similarly, two recent class II or III studies showed that SLE patients very often suffer from mood (44 and 48.8%) and anxiety (16 and 24%) disorders (Ainiala et al., 2001
b; Brey et al., 2002
).
Conclusion
There is only class III evidence that headache is associated with anxiety and depression.
| Discussion |
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By critically reviewing all available published information, we found no difference in the prevalence of headaches between SLE patients and controls. Moreover, no distinct headache syndrome or pathogenetic mechanism for headaches has been demonstrated in SLE patients. Thus, the occurrence of headache in SLE patients does not itself require further investigation. Headache in SLE patients should be classified according to IHS criteria and managed as primary headache in the absence of any complicating factors. If headaches are frequent, prophylactic treatment may be required. Although the presence of lupus headache is considered important in activity indices for SLE patients (Bombardier et al., 1992
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