53
ASAA
Catharino AMS, Neves MAO, Nunes NSM, Nascimento JSF, Nascimento JKF, Martins Jr GC
"Sound attacks": a case report of migraine with hearing aura
Introduction
M
igraine is a complex neurological disorder that affects
various cortical, subcortical, and brainstem areas.
1
This
disorder manifests as a painful headache event characterized
by acute, recurrent, disabling attacks associated with systemic
repercussions, such as gastrointestinal and neurological.
2
Migraine with aura is less frequent than the forms without
aura. Typically, auras are visual in nature, but an auditory
and olfactory nature is possible. However, since they are
less prevalent than visual auras, the current guidelines on the
Classication of Headache Disorders do not recognize them
as part of the typical symptomatology of migraine with auras,
despite their relevance, since they may offer new insights into
the pathophysiology of primary headaches.
3,4
Although little is known about the pathophysiology of auras
of a sensory nature, cortical spreading depression (CSD) is
believed to be responsible for such dysfunctions, as CSD pro-
vides changes in cortical excitabilities triggering disturbances
in the entire length of the neocortex during multisensory au-
ras.
5,6
As far as the auditory manifestations of the auras are
concerned, it is assumed that these arise from neurophysio-
logical alterations originating in the temporal lobe, expressed
by phantosmia, auditory hallucinations and tinnitus.
6
Since auditory aura associated with migraine is an uncom-
mon event, the aim of the present study is to report a case of
auditory events preceding headache in a male schoolchild,
highly suggestive of auditory aura.
Case study
An 8-year-old boy with a family history of migraine reports
that since he was 5 years old, he has had episodes of hearing
alteration, which he calls "sound attacks", lasting 10 to 20
minutes, followed by headache with intense photophobia and
nausea. The frequency of attacks ranged from 4 to 5 episodes
per month, with a maximum of 11 episodes in 1 month.
Neurological examination was normal. He underwent skull
MRI and EEG without alterations. Treatment with divalproate
sodium was started at 250 mg at night, with a reduction of
episodes in the rst month to 2 to 3 episodes per month.
The medication was adjusted to 500 mg of divalproate with
good results, with no new episodes in the last two months
of treatment.
Discussion
The focal neurological phenomena that precede or accompa-
ny a migraine attack are called aura. This may involve visual,
somatosensory, olfactory, or auditory changes. Auditory
symptoms rarely occur as part of an aura.
7
The auditory
symptom most often associated with migraine is phonopho-
bia, which is present in more than two-thirds of patients.
7
Besides this, oscillography, tinnitus, sudden deafness, and
uctuating hearing loss are also reported.
7-9
Different studies
also show the presence of auditory hallucinations such as
aura in migraine patients who do not have psychotic illness-
es. These hallucinations involve voices that last throughout
the migraine attacks, as well as oscillucusia and tinnitus.
10
It is believed that migraine attacks may increase the poten-
tiation of the auditory cortex and, sporadically, stimulate
acoustic auras with auditory hallucinations, since studies with
auditory evoked potentials have demonstrated an absence
of habituation in the auditory cortex of migraine patients.
11
Auditory hallucinations, such as the knowledge of sounds in
the absence of identiable external stimuli, have been speci-
ed in children without psychopathy associated with migraine
attacks. It seems reasonable to consider that hallucinations
are related to migraine pictures, because they start close to
the headache phase and reduce when attacks are treated
by prophylactic methods,
10,12
as in this case report.
In a study carried out by Dash et al.
13
, audio vestibular func-
tionality was observed in migraine patients with or without
associated vertigo. It was concluded that all patients in the
study had some alteration in auditory responses stimulated
by brainstem auditory evoked potential (BAEP); and that
such alterations may congure the rst sign of an auditory
involvement in migraine.
Migraine with aura is described as recurrent attacks, lasting
minutes, of unilateral reversible visual, sensory, or other CNS
symptoms, which usually develop gradually and are usually
followed by headache and other associated symptoms.
14
To
dene the diagnosis of migraine with aura it is fundamental
that the patient fullls some criteria, such as: at least two crises
in which the patient has at least one of the auras: visual, sen-
sory, language, motor, brainstem or retinal.
14
In addition, at
least three characteristics among: aura spreading gradually
over more than ve minutes, two or more aura symptoms in
succession, individual aura symptoms last between 5 and
60 minutes, at least one aura symptom is unilateral, at least
one aura symptom is positive, the aura is accompanied or
followed by headache within 60 minutes.
14
Furthermore, it
is valid to point out that for this diagnosis to be dened it is
fundamental that there is no other disease that can better
explain the patient's condition.
14
Authors contributions: AMSC, Data Collection, Writing and
Supervision; MAON, Supervision; NSMN, JSFN e JKFN,
Writing; GCMJr – approved the nal version.
Funding: No
Conflict of interests: No