The ethics of neuromodulation for anorexia nervosa: a focus on rTMS
Identifieur interne : 000337 ( Pmc/Corpus ); précédent : 000336; suivant : 000338The ethics of neuromodulation for anorexia nervosa: a focus on rTMS
Auteurs : Alina Coman ; Finn Sk Rderud ; Deborah L. Reas ; Bj Rn M. HofmannSource :
- Journal of Eating Disorders [ 2050-2974 ] ; 2014.
Abstract
Recently there has been emerging clinical and research interest in the application of deep brain stimulation (DBS) and repetitive transcranial magnetic stimulation (rTMS) to the treatment of anorexia nervosa (AN). To our knowledge, few studies have discussed ethical aspects associated with the increased use of neuromodulation in AN, some of which are quite specific to AN, despite the rapid development and dissemination of these new technologies.
We provide a brief overview of three published rTMS studies for AN and discuss ethical issues involved in the use of neuromodulation for AN.
In contrast to neurosurgery or DBS, rTMS is a less invasive technique, with less associated risk, and thus has greater potential to become a more widespread augmentation or add-on therapy for AN. New therapeutic procedures are promising, yet they raise ethical questions regarding informed consent and patient selection. Illness-specific issues surrounding authenticity and autonomy are important to consider, ensuring an ethical approach to treatment for patients with AN.
We argue that ethical investigations for neuromodulation techniques are timely and important, and discussions should go beyond the immediate goals of patient safety, consent, and risk and benefit, to consider broader ethical concepts such as authenticity and autonomy.
Url:
DOI: 10.1186/2050-2974-2-10
PubMed: 24690315
PubMed Central: 3977899
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">The ethics of neuromodulation for anorexia nervosa: a focus on rTMS</title><author><name sortKey="Coman, Alina" sort="Coman, Alina" uniqKey="Coman A" first="Alina" last="Coman">Alina Coman</name><affiliation><nlm:aff id="I1">Regional Eating Disorders Service (RASP), Division of Mental Health and Addiction, Oslo University Hospital-Ullevål, P.O. Box 4956 Nydalen, Oslo N-0424, Norway</nlm:aff></affiliation><affiliation><nlm:aff id="I2">Centre for Medical Ethics, University of Oslo, P.O. Box 1130, Blindern, Oslo N-0318, Norway</nlm:aff></affiliation></author><author><name sortKey="Sk Rderud, Finn" sort="Sk Rderud, Finn" uniqKey="Sk Rderud F" first="Finn" last="Sk Rderud">Finn Sk Rderud</name><affiliation><nlm:aff id="I1">Regional Eating Disorders Service (RASP), Division of Mental Health and Addiction, Oslo University Hospital-Ullevål, P.O. Box 4956 Nydalen, Oslo N-0424, Norway</nlm:aff></affiliation><affiliation><nlm:aff id="I3">Institute of Special Needs Education, University of Oslo, Sognsveien 250, Oslo N-0863, Norway</nlm:aff></affiliation></author><author><name sortKey="Reas, Deborah L" sort="Reas, Deborah L" uniqKey="Reas D" first="Deborah L" last="Reas">Deborah L. Reas</name><affiliation><nlm:aff id="I1">Regional Eating Disorders Service (RASP), Division of Mental Health and Addiction, Oslo University Hospital-Ullevål, P.O. Box 4956 Nydalen, Oslo N-0424, Norway</nlm:aff></affiliation></author><author><name sortKey="Hofmann, Bj Rn M" sort="Hofmann, Bj Rn M" uniqKey="Hofmann B" first="Bj Rn M" last="Hofmann">Bj Rn M. Hofmann</name><affiliation><nlm:aff id="I2">Centre for Medical Ethics, University of Oslo, P.O. Box 1130, Blindern, Oslo N-0318, Norway</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">24690315</idno><idno type="pmc">3977899</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3977899</idno><idno type="RBID">PMC:3977899</idno><idno type="doi">10.1186/2050-2974-2-10</idno><date when="2014">2014</date><idno type="wicri:Area/Pmc/Corpus">000337</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000337</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">The ethics of neuromodulation for anorexia nervosa: a focus on rTMS</title><author><name sortKey="Coman, Alina" sort="Coman, Alina" uniqKey="Coman A" first="Alina" last="Coman">Alina Coman</name><affiliation><nlm:aff id="I1">Regional Eating Disorders Service (RASP), Division of Mental Health and Addiction, Oslo University Hospital-Ullevål, P.O. Box 4956 Nydalen, Oslo N-0424, Norway</nlm:aff></affiliation><affiliation><nlm:aff id="I2">Centre for Medical Ethics, University of Oslo, P.O. Box 1130, Blindern, Oslo N-0318, Norway</nlm:aff></affiliation></author><author><name sortKey="Sk Rderud, Finn" sort="Sk Rderud, Finn" uniqKey="Sk Rderud F" first="Finn" last="Sk Rderud">Finn Sk Rderud</name><affiliation><nlm:aff id="I1">Regional Eating Disorders Service (RASP), Division of Mental Health and Addiction, Oslo University Hospital-Ullevål, P.O. Box 4956 Nydalen, Oslo N-0424, Norway</nlm:aff></affiliation><affiliation><nlm:aff id="I3">Institute of Special Needs Education, University of Oslo, Sognsveien 250, Oslo N-0863, Norway</nlm:aff></affiliation></author><author><name sortKey="Reas, Deborah L" sort="Reas, Deborah L" uniqKey="Reas D" first="Deborah L" last="Reas">Deborah L. Reas</name><affiliation><nlm:aff id="I1">Regional Eating Disorders Service (RASP), Division of Mental Health and Addiction, Oslo University Hospital-Ullevål, P.O. Box 4956 Nydalen, Oslo N-0424, Norway</nlm:aff></affiliation></author><author><name sortKey="Hofmann, Bj Rn M" sort="Hofmann, Bj Rn M" uniqKey="Hofmann B" first="Bj Rn M" last="Hofmann">Bj Rn M. Hofmann</name><affiliation><nlm:aff id="I2">Centre for Medical Ethics, University of Oslo, P.O. Box 1130, Blindern, Oslo N-0318, Norway</nlm:aff></affiliation></author></analytic><series><title level="j">Journal of Eating Disorders</title><idno type="eISSN">2050-2974</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec><title>Objective</title><p>Recently there has been emerging clinical and research interest in the application of deep brain stimulation (DBS) and repetitive transcranial magnetic stimulation (rTMS) to the treatment of anorexia nervosa (AN). To our knowledge, few studies have discussed ethical aspects associated with the increased use of neuromodulation in AN, some of which are quite specific to AN, despite the rapid development and dissemination of these new technologies.</p></sec><sec><title>Method</title><p>We provide a brief overview of three published rTMS studies for AN and discuss ethical issues involved in the use of neuromodulation for AN.</p></sec><sec><title>Results</title><p>In contrast to neurosurgery or DBS, rTMS is a less invasive technique, with less associated risk, and thus has greater potential to become a more widespread augmentation or add-on therapy for AN. New therapeutic procedures are promising, yet they raise ethical questions regarding informed consent and patient selection. Illness-specific issues surrounding authenticity and autonomy are important to consider, ensuring an ethical approach to treatment for patients with AN.</p></sec><sec><title>Discussion</title><p>We argue that ethical investigations for neuromodulation techniques are timely and important, and discussions should go beyond the immediate goals of patient safety, consent, and risk and benefit, to consider broader ethical concepts such as authenticity and autonomy.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Insel, T" uniqKey="Insel T">T Insel</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Pietrini, F" uniqKey="Pietrini F">F Pietrini</name></author><author><name sortKey="Castellini, G" uniqKey="Castellini G">G Castellini</name></author><author><name sortKey="Ricca, V" uniqKey="Ricca V">V Ricca</name></author><author><name sortKey="Polito, C" uniqKey="Polito C">C 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<front><journal-meta><journal-id journal-id-type="nlm-ta">J Eat Disord</journal-id><journal-id journal-id-type="iso-abbrev">J Eat Disord</journal-id><journal-title-group><journal-title>Journal of Eating Disorders</journal-title></journal-title-group><issn pub-type="epub">2050-2974</issn><publisher><publisher-name>BioMed Central</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">24690315</article-id><article-id pub-id-type="pmc">3977899</article-id><article-id pub-id-type="publisher-id">2050-2974-2-10</article-id><article-id pub-id-type="doi">10.1186/2050-2974-2-10</article-id><article-categories><subj-group subj-group-type="heading"><subject>Review</subject></subj-group></article-categories><title-group><article-title>The ethics of neuromodulation for anorexia nervosa: a focus on rTMS</article-title></title-group><contrib-group><contrib contrib-type="author" corresp="yes" id="A1"><name><surname>Coman</surname><given-names>Alina</given-names></name><xref ref-type="aff" rid="I1">1</xref><xref ref-type="aff" rid="I2">2</xref><email>alina.coman@medisin.uio.no</email></contrib><contrib contrib-type="author" id="A2"><name><surname>Skårderud</surname><given-names>Finn</given-names></name><xref ref-type="aff" rid="I1">1</xref><xref ref-type="aff" rid="I3">3</xref><email>finns@online.no</email></contrib><contrib contrib-type="author" id="A3"><name><surname>Reas</surname><given-names>Deborah L</given-names></name><xref ref-type="aff" rid="I1">1</xref><email>deborah.lynn.reas@ous-hf.no</email></contrib><contrib contrib-type="author" id="A4"><name><surname>Hofmann</surname><given-names>Bjørn M</given-names></name><xref ref-type="aff" rid="I2">2</xref><email>b.m.hofmann@medisin.uio.no</email></contrib></contrib-group><aff id="I1"><label>1</label>Regional Eating Disorders Service (RASP), Division of Mental Health and Addiction, Oslo University Hospital-Ullevål, P.O. Box 4956 Nydalen, Oslo N-0424, Norway</aff><aff id="I2"><label>2</label>Centre for Medical Ethics, University of Oslo, P.O. Box 1130, Blindern, Oslo N-0318, Norway</aff><aff id="I3"><label>3</label>Institute of Special Needs Education, University of Oslo, Sognsveien 250, Oslo N-0863, Norway</aff><pub-date pub-type="collection"><year>2014</year></pub-date><pub-date pub-type="epub"><day>1</day><month>4</month><year>2014</year></pub-date><volume>2</volume><fpage>10</fpage><lpage>10</lpage><history><date date-type="received"><day>10</day><month>1</month><year>2014</year></date><date date-type="accepted"><day>16</day><month>3</month><year>2014</year></date></history><permissions><copyright-statement>Copyright © 2014 Coman et al.; licensee BioMed Central Ltd.</copyright-statement><copyright-year>2014</copyright-year><copyright-holder>Coman et al.; licensee BioMed Central Ltd.</copyright-holder><license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/2.0"><license-p>This is an Open Access article distributed under the terms of the Creative Commons Attribution License (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/2.0">http://creativecommons.org/licenses/by/2.0</ext-link>), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/publicdomain/zero/1.0/">http://creativecommons.org/publicdomain/zero/1.0/</ext-link>) applies to the data made available in this article, unless otherwise stated.</license-p></license></permissions><self-uri xlink:href="http://www.jeatdisord.com/content/2/1/10"></self-uri><abstract><sec><title>Objective</title><p>Recently there has been emerging clinical and research interest in the application of deep brain stimulation (DBS) and repetitive transcranial magnetic stimulation (rTMS) to the treatment of anorexia nervosa (AN). To our knowledge, few studies have discussed ethical aspects associated with the increased use of neuromodulation in AN, some of which are quite specific to AN, despite the rapid development and dissemination of these new technologies.</p></sec><sec><title>Method</title><p>We provide a brief overview of three published rTMS studies for AN and discuss ethical issues involved in the use of neuromodulation for AN.</p></sec><sec><title>Results</title><p>In contrast to neurosurgery or DBS, rTMS is a less invasive technique, with less associated risk, and thus has greater potential to become a more widespread augmentation or add-on therapy for AN. New therapeutic procedures are promising, yet they raise ethical questions regarding informed consent and patient selection. Illness-specific issues surrounding authenticity and autonomy are important to consider, ensuring an ethical approach to treatment for patients with AN.</p></sec><sec><title>Discussion</title><p>We argue that ethical investigations for neuromodulation techniques are timely and important, and discussions should go beyond the immediate goals of patient safety, consent, and risk and benefit, to consider broader ethical concepts such as authenticity and autonomy.</p></sec></abstract></article-meta></front><body><sec><title>Review</title><p>Recently, the US National Institute of Mental Health (NIMH) has moved towards a conceptualization of AN as a disorder of neurocircuitry which can be elucidated with modern tools and technological advances, especially genomics and neuroimaging
[<xref ref-type="bibr" rid="B1">1</xref>]. At present, the aetiology and pathophysiology of AN are not completely known, yet genetic and neuroimaging studies are revealing greater insight into the underlying neural correlates which might be involved in the aetiology of AN. To date, neuroimaging, especially fMRI studies, suggest alterations in the dorsolateral prefrontal cortex area (DLPFC), insular, parietal and anterior cingulated cortex, all of which are areas involved in emotional processing, processing of reward, and body perception
[<xref ref-type="bibr" rid="B2">2</xref>,<xref ref-type="bibr" rid="B3">3</xref>]. Traditionally, study paradigms used in neuroimaging have focused on investigating response to food and body stimuli, and illness-specific brain activity patterns related to symptoms. As has been acknowledged, underweight status is an ever-present confounder in investigations of AN, and while some studies indicate the presence of pre-existing traits
[<xref ref-type="bibr" rid="B4">4</xref>] other studies indicate the existence of a scar effect due to underweight status or malnutrition
[<xref ref-type="bibr" rid="B5">5</xref>]. At present, knowledge about the relationship between brain activity and illness, as informed by neuroimaging technologies, is correlational, yet findings are typically used as a rationale for the application of neuromodulation techniques to the treatment of AN. Neuromodulation techniques include invasive methods such as neurosurgery or deep brain stimulation (DBS), or non-invasive brain stimulation (NIBS), including repetitive transcranial stimulation (rTMS). Neuroimaging is seen as a promising tool to improve the efficacy of these techniques, especially rTMS by helping identify an appropriate stimulation target, which is considered to be a current main limitation
[<xref ref-type="bibr" rid="B6">6</xref>].</p><p>Data demonstrating efficacy of neuromodulation methods for treating psychiatric disorders in general is accumulating, with a growing consensus towards the application of neuromodulation such as rTMS in treating depression, for example
[<xref ref-type="bibr" rid="B7">7</xref>]. The invasive nature of these interventions, especially neurosurgery and DBS, and the inherent ethical considerations render these forms of treatment a last-resort for a subgroup of treatment-resistant patients. Anorexia nervosa is associated with high mortality rates
[<xref ref-type="bibr" rid="B8">8</xref>] and a subgroup of patients experiences a chronic outcome
[<xref ref-type="bibr" rid="B9">9</xref>]. As such, neuromodulation techniques have been increasingly proposed for the treatment of severe and longstanding AN proven refractory to standard treatment
[<xref ref-type="bibr" rid="B10">10</xref>]. Such neuromodulation techniques are often not stand-alone treatment but they are used as additional or augmentation treatment in combination with behavioural training or other forms of therapy
[<xref ref-type="bibr" rid="B11">11</xref>].</p><p>Some studies have shown positive results and provide proof-of-concept for AN as a disorder of brain circuitry, yet the mechanisms underlying neuromodulation techniques are not completely known. For AN, the evidence base for rTMS and DBS remains limited. Lipsman et al.
[<xref ref-type="bibr" rid="B12">12</xref>] offer a thorough historical overview of the literature on the frequency and effects of neurosurgery. The lack of understanding neurocircuitry and the lack of specificity in targets of stimulation has made some critics advocate for ‘neuromodesty’
[<xref ref-type="bibr" rid="B13">13</xref>] and emphasize the necessity to investigate ethical aspects associated with neuromodulation. History has shown that it is important to stay vigilant and prevent misuse of these techniques in order to avoid negative experiences and attitudes that could deprive patients of therapeutic help
[<xref ref-type="bibr" rid="B6">6</xref>].</p><p>We feel that rapid advances and new research priorities have arguably introduced a paradigm shift in defining and treating AN, making a renewed discussion of associated ethical concerns timely and important
[<xref ref-type="bibr" rid="B11">11</xref>,<xref ref-type="bibr" rid="B12">12</xref>,<xref ref-type="bibr" rid="B14">14</xref>]. Some have argued that elucidating important ethical concerns is vital, especially since new technologies are often approved and implemented without critical appraisal
[<xref ref-type="bibr" rid="B15">15</xref>] and the promise of neuroscience might, for some, have a “seductive” allure
[<xref ref-type="bibr" rid="B16">16</xref>]. This appears to be also the case for psychotropic medication that is still recommended to a group of patients with AN despite known adverse effects and lack of data supporting their efficacy
[<xref ref-type="bibr" rid="B17">17</xref>].</p><p>Brain-based interventions, even neurosurgery for AN, are not new
[<xref ref-type="bibr" rid="B18">18</xref>]. Some have argued that although techniques such as DBS or rTMS represent recent therapeutic advances, the relevant ethical challenges they pose have been previously addressed in the bioethical literature for other medical or psychological treatments
[<xref ref-type="bibr" rid="B13">13</xref>]. However, whereas specific ethical issues related to DBS have been discussed more broadly for other psychiatric disorders
[<xref ref-type="bibr" rid="B19">19</xref>-<xref ref-type="bibr" rid="B21">21</xref>], and recently for AN
[<xref ref-type="bibr" rid="B22">22</xref>], few debates have focused on rTMS. Further, existing ethical evaluations of rTMS for other psychiatric disorders have focused predominantly on safety issues alone
[<xref ref-type="bibr" rid="B6">6</xref>].</p><p>This article can be seen as a first step in the endeavor to shed light on specific ethical issues that the use of neuromodulation techniques pose for patients suffering from AN. Although some issues pertain to neuromodulation techniques at-large, we focus mainly on rTMS. Clinically speaking, we feel a focus on rTMS is timely and important, as this procedure is less invasive and might be applied less severe patients, thereby not constituting a ‘last-resort’ treatment, but possibly functioning as an additional or augmentation treatment which is more widely accessible to treatment providers. In contrast, DBS is a more invasive treatment with greater challenges to issues of safety, long-term effects and informed consent, and its use will most probably be guided by restrictive regulations.</p><sec><title>Neuromodulation techniques for AN: rTMS studies</title><p>Repetitive transcranial magnetic stimulation induces repetitive stimulation to cortical tissue with the help of magnetic field pulses from a magnetic coil placed outside the head. It either suppresses (at low frequency, 1 Hz) or excites (at higher frequency, 20 Hz) cortical activity, and its effect can propagate beyond the site of stimulation to a network of brain regions. The only Food and Drug Administration (FDA) approved therapeutic use of TMS is for stimulating the dorsolateral prefrontal cortex (DLPFC) for medication-resistant depression. However, the therapeutic efficacy data for depression is limited, partly because stimulation of DLPFC is based on a vague understanding of which specific mechanisms are stimulated, considering that DLPFC is connected with many other brain areas
[<xref ref-type="bibr" rid="B23">23</xref>].</p><p>There are six studies that explore the effects of rTMS on bulimic disorders and findings are inconsistent, with some studies showing placebo effects while other reporting significant changes
[<xref ref-type="bibr" rid="B10">10</xref>]. Three studies, of which one is a single case study, explore effects of rTMS for symptoms of AN. Table
<xref ref-type="table" rid="T1">1</xref> provides a brief overview of clinical details and outcome for the three studies for AN. Initial findings are promising, yet mixed
[<xref ref-type="bibr" rid="B24">24</xref>-<xref ref-type="bibr" rid="B26">26</xref>]. No studies have yet assessed the duration of improvement in symptoms beyond one month, or the longer-term and secondary effects of these interventions, and future studies will need to establish for which patients these interventions work best. Randomized controlled studies, which are underway in several countries including the UK and France, are necessary to delineate specific effects of rTMS and confirm the proof-of-concept for rTMS as a method which affects disturbed neural circuitry for reward and self-regulation
[<xref ref-type="bibr" rid="B25">25</xref>]. Thus far, however, the use of these methods is exploratory and mostly confined to research settings and has not been routinely implemented as a therapeutic technique in the clinics.</p><table-wrap position="float" id="T1"><label>Table 1</label><caption><p>rTMS studies in anorexia nervosa</p></caption><table frame="hsides" rules="groups" border="1"><colgroup><col align="left"></col><col align="left"></col><col align="left"></col><col align="left"></col><col align="left"></col></colgroup><thead valign="top"><tr><th align="left"><bold>Authors (year)</bold></th><th align="left"><bold>N</bold></th><th align="left"><bold>Patient characteristics</bold></th><th align="left"><bold>Treatment</bold></th><th align="left"><bold>Primary outcome</bold></th></tr></thead><tbody valign="top"><tr><td rowspan="5" align="left" valign="bottom">Kamolz et al. (2008)
[<xref ref-type="bibr" rid="B24">24</xref>]<hr></hr></td><td rowspan="5" align="left" valign="bottom">1<hr></hr></td><td align="left" valign="bottom">Gender: female<hr></hr></td><td rowspan="2" align="left" valign="bottom">Treatment of comorbid depression in a female patient with AN.<hr></hr></td><td rowspan="4" align="left" valign="bottom">Improvement in depression was observed, as well as weight gain and fewer ED symptoms. After 1<sup>st</sup> cycle, HAM-D scores decreased from 28 to 14. After 2<sup>nd</sup> cycle, HAM-D scores decreased from 18 to 10. After 3<sup>rd</sup> cycle, HAM-D scores decreased 18 to 11. During continuation therapy, HAM-D scores remained between 8 and 10.<hr></hr></td></tr><tr><td align="left" valign="bottom">Age: 24 yrs.<hr></hr></td></tr><tr><td align="left" valign="bottom">BMI: 12.4<hr></hr></td><td rowspan="2" align="left" valign="bottom">1<sup>st</sup> cycle included 10 sessions within 16 days of high frequency rTMS to the left dorsolateral prefrontal cortex. 2<sup>nd</sup> cycle included 6 sessions. 3<sup>rd</sup> cycle included 10 sessions.<hr></hr></td></tr><tr><td rowspan="2" align="left" valign="bottom">DOI: app. 4 yrs.<hr></hr></td></tr><tr><td align="left" valign="bottom">Continuation therapy included twice weekly rTMS sessions for 8 weeks.<hr></hr></td><td align="left" valign="bottom">BMI increased to approximately 16 kg/m<sup>2</sup> after 12 weeks of rTMS.<hr></hr></td></tr><tr><td rowspan="8" align="left" valign="bottom">Van den Eynde et al. (2013)
[<xref ref-type="bibr" rid="B25">25</xref>]<hr></hr></td><td rowspan="8" align="left" valign="bottom">10<hr></hr></td><td align="left" valign="bottom">Gender: female<hr></hr></td><td rowspan="3" align="left" valign="bottom">Delivered 1 session of high frequency rTMS to the left dorsolateral prefrontal cortex.<hr></hr></td><td rowspan="2" align="left" valign="bottom">1 patient dropped out prematurely due to discomfort.<hr></hr></td></tr><tr><td rowspan="3" align="left" valign="bottom">Mean age: 25 yrs.<hr></hr></td></tr><tr><td rowspan="6" align="left" valign="bottom">On the visual analogue scale, significant reductions in feeling fat, feeling full, and anxiety, with a non-significant trend for decreased urge to exercise. No significant changes in mood, tension, hunger, “urge to eat” or “urge to restrict”. No reduction in cortisol levels, but found to be cardiac safe, as measured by blood pressure and heart rate.<hr></hr></td></tr><tr><td rowspan="5" align="left" valign="bottom">ED-related experiences were measured pre-post following exposure to visual and food stimuli<hr></hr></td></tr><tr><td align="left" valign="bottom">(18-44)<hr></hr></td></tr><tr><td align="left" valign="bottom">Mean BMI: 15.7<hr></hr></td></tr><tr><td align="left" valign="bottom">(13.8-17.8)<hr></hr></td></tr><tr><td align="left" valign="bottom">DOI: 10 yrs (3–30)<hr></hr></td></tr><tr><td rowspan="10" align="left" valign="bottom">McClelland et al. (2013)
[<xref ref-type="bibr" rid="B26">26</xref>]<hr></hr></td><td rowspan="10" align="left" valign="bottom">2<hr></hr></td><td align="left" valign="bottom">Patient A<hr></hr></td><td rowspan="3" align="left" valign="bottom">Delivered 19–20 sessions of high frequency rTMS, applied to the left dorsolateral prefrontal cortex.<hr></hr></td><td align="left" valign="bottom">Patient A<hr></hr></td></tr><tr><td align="left" valign="bottom">Gender: female<hr></hr></td><td rowspan="5" align="left" valign="bottom">No change in weight at post-treatment or at 1-month follow-up. EDE-Q scores (except Eating Concern) were significantly lower at post-treatment and improvements were maintained at FUP. Some improvement in depression was observed.<hr></hr></td></tr><tr><td align="left" valign="bottom">Age: 23 yrs.<hr></hr></td></tr><tr><td align="left" valign="bottom">BMI: 15.7<hr></hr></td><td rowspan="7" align="left" valign="bottom">Within-session changes in ED-related experiences were measured. BMI, ED symptoms, and depression measured at pre-treatment, post-treatment, and 1-month follow-up.<hr></hr></td></tr><tr><td align="left" valign="bottom">DOI: 12 yrs.<hr></hr></td></tr><tr><td align="left" valign="bottom">Patient B<hr></hr></td></tr><tr><td rowspan="2" align="left" valign="bottom">Gender: female<hr></hr></td><td align="left" valign="bottom">Patient B<hr></hr></td></tr><tr><td rowspan="3" align="left" valign="bottom">No change in weight at post-treatment or 1-month follow-up. Improvements in EDE-Q scores and depression were observed.<hr></hr></td></tr><tr><td align="left" valign="bottom">Age: 52<hr></hr></td></tr><tr><td align="left" valign="bottom">BMI: 16.4<hr></hr></td></tr><tr><td align="left"> </td><td align="left"> </td><td align="left">DOI: 35 yrs.</td><td align="left"> </td><td align="left"> </td></tr></tbody></table><table-wrap-foot><p><italic>Note:</italic> rTMS = repetitive transcranial magnetic stimulation; BMI = body mass index (kg/m<sup>2</sup>); DOI = duration of illness; HAM-D = Hamilton Depression Scale; EDE-Q = Eating Disorder Examination-Questionnaire, FUP = follow-up period.</p></table-wrap-foot></table-wrap></sec><sec><title>Ethical issues in neuromodulation for AN</title><p>In the treatment of AN, ethical discussions have mostly focused on clinical issues related to underweight, malnutrition, and the capacity to refuse treatment. However, with the increased use of brain interventions for treating AN, other ethical concerns specific to the application of (mechanical) brain interventions need elaboration.</p><p>Ethical assessment of the use of neuromodulation is often based on four principles: respect for autonomy, beneficence, non-maleficence, and justice. Table
<xref ref-type="table" rid="T2">2</xref> provides an overview of the application of these ethical principles to the case of rTMS in AN. The following section summarizes and relates these aspects to principalism, as this is the most influential approach in bioethics.</p><table-wrap position="float" id="T2"><label>Table 2</label><caption><p>rTMS in AN and relevant ethical considerations</p></caption><table frame="hsides" rules="groups" border="1"><colgroup><col align="left"></col><col align="left"></col></colgroup><thead valign="top"><tr><th align="left"><bold>Ethical principle</bold></th><th align="left"><bold>Threats pertinent for rTMS in AN</bold></th></tr></thead><tbody valign="top"><tr><td rowspan="2" align="left" valign="bottom">Non-maleficence (do no harm)<hr></hr></td><td align="left" valign="bottom">Risks<hr></hr></td></tr><tr><td align="left" valign="bottom">Side-effects and long-term effects<hr></hr></td></tr><tr><td rowspan="2" align="left" valign="bottom">Beneficence (do well)<hr></hr></td><td align="left" valign="bottom">Effectiveness<hr></hr></td></tr><tr><td align="left" valign="bottom">Patient selection<hr></hr></td></tr><tr><td rowspan="3" align="left" valign="bottom">Respect for autonomy<hr></hr></td><td align="left" valign="bottom">Informed consent<hr></hr></td></tr><tr><td align="left" valign="bottom">(Emotional and cognitive) capacity issue due to underweight<hr></hr></td></tr><tr><td align="left" valign="bottom">Comorbidity, mortality, resistance to treatment<hr></hr></td></tr><tr><td align="left">Justice</td><td align="left">Patient selection, Resource allocation, Research deprivation</td></tr></tbody></table></table-wrap><sec><title>Balancing non-maleficence and beneficence</title><p>So far, the risks associated with participating in rTMS are low; however, since there is no evidence for the long-term effects and efficacy of rTMS, the risk-benefit ratio is difficult to assess
[<xref ref-type="bibr" rid="B21">21</xref>]. Hence, utilitarian analysis fails to provide clear guidance in decision-making, and the beneficence is unclear. A pilot study for rTMS showed reductions in feeling of fatness and fullness, and anxiety, but fewer changes in mood, tension or urge to exercise
[<xref ref-type="bibr" rid="B25">25</xref>]. In the future, it will also be relevant to establish criteria for evaluating effectiveness. If rTMS is proven effective and alleviates symptoms, it is relevant to establish the criteria for patient inclusion that should be adopted before neuromodulation is recommended, and establish the patient group for whom rTMS is relevant. In Van den Eynde’s study
[<xref ref-type="bibr" rid="B25">25</xref>], the group of participants investigated was heterogeneous, and included individuals with different duration of disorders, which make it hard to know whether neuromodulatory interventions are more effective for less severe patients or chronic patients. Difficulties and disagreement over the definition of severity, e.g., in terms of BMI-alone, level of impairment, or other eating-related or general psychopathology, has thus far rendered the assessment of beneficence complicated.</p><p>Related to this argument, illness duration and refractoriness to treatment is often invoked as a rationale for neuromodulation
[<xref ref-type="bibr" rid="B12">12</xref>]. Some have argued that moderate or a less severe illness might in fact be more responsive to brain interventions
[<xref ref-type="bibr" rid="B27">27</xref>]. In AN, chronicity is typically seen after a period of 10 years
[<xref ref-type="bibr" rid="B28">28</xref>]. Treating only patients with a long duration of illness may do injustice to individuals with a shorter duration of illness
[<xref ref-type="bibr" rid="B27">27</xref>]. Thus ensuring a favorable risk-benefit ratio has also a moral aspect where issues of safety have to be balanced with the desire to help a group of patients who are not helped by other methods. This poses problems for autonomy and informed consent.</p></sec><sec><title>Respect for autonomy</title><p>Respect for autonomy is usually ensured by proper informed consent. At present, rTMS (and DBS) interventions for AN are often a last–resort treatment for patients who do not respond to other treatments. It has often been underlined in the ethics literature that patients participating in such last-resort exploratory research or treatment trials are “desperate” for a solution. As such, this subgroup of treatment refractory patients may be “overly motivated’ to participate in exploratory research and to expose themselves to risks
[<xref ref-type="bibr" rid="B13">13</xref>]. This poses challenges to the capacity of these patients to fully understand the nature of intervention and implications of participation. Depression can affect perception of risks associated with participating in research
[<xref ref-type="bibr" rid="B19">19</xref>], although some argue that depression in itself is not enough to compromise judgment
[<xref ref-type="bibr" rid="B29">29</xref>]. For AN, the condition of severe underweight poses some additional ethical considerations of competency and non-maleficence. Severe underweight can lead to involuntary hospitalization and forced feeding based on the assumption that individuals lack cognitive or emotional capacity to make decisions
[<xref ref-type="bibr" rid="B30">30</xref>]. Offering neuromodulation treatment to patients who are emaciated or malnourished poses inherent ethical dilemmas given the potential incapacity associated with underweight status.</p><p>While some rTMS studies conducted so far have excluded severely underweight patients, protecting them from harm, other studies have included patients with a BMI from 12.3.</p><p>Chronicity of illness, underweight and willingness to participate in last resort interventions, be it proven or experimental, can raise questions about the validity of informed consent. The validity of a consent coming from a person that is severely underweight, refractory to treatment, yet willing to undergo brain interventions, can be questioned. Assessing the validity of such consent will be dependent on objective and established criteria for competence. However, it is also dependant on the kind of policy adopted, either a restrictive, paternalistic attitude or a permissive one “permitting people to make unencumbered decision about how to govern their own lives”, and on how low the competence bar is set
[<xref ref-type="bibr" rid="B13">13</xref>]. In cases where the competence bar is set low, it is essential to disclose to the participant all known and unknown information about the intervention in order to ensure informed consent.</p><p>The “overtly motivated,” possibly depressed patient is a general ethical concern. However, in AN, a lack of motivation and reluctance to engage in treatment has more often been the case. Especially pharmacological treatment, for example, antipsychotic medication such as olanzapine, is associated with higher drop-out than cognitive
[<xref ref-type="bibr" rid="B31">31</xref>] and cognitive-behavioural treatment
[<xref ref-type="bibr" rid="B32">32</xref>]. Further, the drop-out rate for adults with AN is higher (40%) than for adolescents in family therapy, in which the drop-out rates fall around 10-20%
[<xref ref-type="bibr" rid="B32">32</xref>]. However, reluctance to medication might be explained by fears of weight gain, which can be a secondary effect of olanzapine
[<xref ref-type="bibr" rid="B33">33</xref>]. Although it remains yet unknown how patients view neuromodulatory treatments, rTMS has been shown to reduce feelings of fullness or fatness, and to lessen anxiety, which may have greater appeal. In this case, the concern is rather, when the patient is motivated, how to proceed ethically. Given the current limited status of knowledge of neurocorrelates for AN, of the efficacy of mechanisms for brain stimulation and long-term effects, critics have drawn attention to the fact that neuromodulation means little. To proceed ethically would mean an invitation to “hyper disclosure”
[<xref ref-type="bibr" rid="B13">13</xref>].</p><p>Another threat to autonomous participation in neuromodulatory interventions is the risk for <italic>therapeutic misconception</italic>, adopting the belief that participating in research will alleviate suffering. Informed consent should therefore aim to avoid misunderstanding, and facilitate autonomy, by making explicit the current experimental nature of the research, and ensure that the patient is explicitly informed about what rTMS can offer and not offer.</p><p>It is also possible that investigator bias, or simply the desire to understand the relation between the brain and illness, or to alleviate intense suffering, leads to overstatements of the current state of knowledge and this can impede cautious proceeding
[<xref ref-type="bibr" rid="B13">13</xref>]. Especially in light of the high mortality and morbidity rate, AN may challenge the therapists’ clinical judgment and bias them to recommend the available new treatments, despite an evidence base which is still evolving. On the other hand, any negative attitudes or bias against brain interventions may encourage therapists to withhold treatment from patients
[<xref ref-type="bibr" rid="B6">6</xref>].</p></sec><sec><title>Justice</title><p>Critics have drawn attention to the need to balance ethical concerns and (over) protection of rights that has sometimes led to “research deprivation”
[<xref ref-type="bibr" rid="B34">34</xref>]. This is perhaps especially applicable to children and adolescents with AN, with a consideration of young individuals’ agency
[<xref ref-type="bibr" rid="B35">35</xref>] and the need to proceed cautiously.</p><p>Researchers have already pointed to the perplexities of providing sound scientific evidence for medicated treatment and how consideration for safety by including the adult population entails high drop-out and biases samples
[<xref ref-type="bibr" rid="B32">32</xref>]. This has made researchers inclined to advocate intensification of interventions at early stages of the disorder instead of conducting more randomized studies
[<xref ref-type="bibr" rid="B32">32</xref>]. Others have warranted a more detailed and critical re-evaluation of the meaning and criteria for resistance to treatment
[<xref ref-type="bibr" rid="B36">36</xref>], as it is an often-invoked argument for use of neuromodulation techniques but little described in the studies
[<xref ref-type="bibr" rid="B12">12</xref>].</p></sec><sec><title>Autonomy and beyond: authenticity</title><p>Whether such interventions are proven effective in the future and the medical risks low, it will still be necessary to provide adequate care and attention to the individual and also longer-term follow-up. Resistance to standard treatment is often invoked by patients on the grounds of threats to authenticity, where aspects of AN are seen as integrative of the self and therefore the patient is less willing to change
[<xref ref-type="bibr" rid="B37">37</xref>]. All treatments, medical or psychological, can be said to change aspects of the self, and to either threaten or contribute to the development of what is conceived as “authentic”, although this concept is contested
[<xref ref-type="bibr" rid="B38">38</xref>]. Although the understanding of authenticity and the role of this concept in treatment is still poorly understood, studies show that threats to authenticity are experienced by patients although mostly in the beginning of the treatment as grounds to refuse treatment
[<xref ref-type="bibr" rid="B37">37</xref>]. Although concerns for authenticity appear to be amenable to change over time, and should not just be taken at face-value as a valid reason to respect patients’ refusal of treatment, an ethical approach to treatment requires nevertheless a consideration of patients’ concerns with authenticity.</p><p>Technological assisted treatment, as with rTMS, touches on broader debates about the nature and meaning of symptoms and neuromodulatory techniques. As mentioned earlier, the results from early trials of rTMS seem to show reductions in feelings of fullness and fatness. Yet patients may be reluctant to address ideas regarding overconcern of shape and weight, which may be intertwined with the subjective meaning of the illness ascribed by the patient
[<xref ref-type="bibr" rid="B39">39</xref>]. For example, feelings of fatness have been shown to be related to expressing emotions of sadness or disgust that are displaced on the body, and depend on context
[<xref ref-type="bibr" rid="B40">40</xref>]. Preoccupation with the body, restriction, purging can be seen as concrete representation of psychological states, a tendency some have termed ‘psychological equivalence’
[<xref ref-type="bibr" rid="B41">41</xref>].</p><p>Importantly, differentiating between the meaning of symptoms according to the patient and the aetiology of symptoms demands clinical skills from the therapists. It is feasible that recommending a neuromodulation technique might alienate the patient by rendering important and ego-syntonic symptoms reducible to defect neuro-networks. Earlier studies show that although biological framing of the disorder can reduce self-blame, it can also disturb self-understanding and the perception of volition seen as significant for recovery
[<xref ref-type="bibr" rid="B42">42</xref>,<xref ref-type="bibr" rid="B43">43</xref>]. Therefore the therapist is in a position to address participants concerns about authenticity and agency when they jointly determine treatment goals
[<xref ref-type="bibr" rid="B37">37</xref>].</p></sec><sec><title>A complementary criterion: individual experience, cultural and social aspects</title><p>The risk-benefit calculations must be based on assessing effectiveness both at the group level but also at the individual level
[<xref ref-type="bibr" rid="B44">44</xref>]. At present, it remains uncertain how patients might experience these technologies and whether they present threats to authenticity. We argue that this should be done not only based on quantitative measures of benefit, but should be complemented by a first-person account of the role such technologies play in the life of the sufferer. For example, such first-person accounts have been shown to be a contribution to the debate about medication of children with ADHD
[<xref ref-type="bibr" rid="B38">38</xref>]. The answers to these questions could ensure a complete ethical evaluation and ethical approach to the use of neurotechnologies, and prevent “clinical push” and technological enthusiasm which may create stigma that would deprive sufferers of therapeutic benefit
[<xref ref-type="bibr" rid="B6">6</xref>].</p><p>Lastly, ethical perspectives may be influenced by cultural and societal values. While the media is increasingly presenting the brain as a “capital that should be optimized”
[<xref ref-type="bibr" rid="B45">45</xref>], and the brain becomes an integrated, although not dominant part of our self-understanding
[<xref ref-type="bibr" rid="B43">43</xref>,<xref ref-type="bibr" rid="B46">46</xref>], the public may become more cautious about brain interventions as neuromodulation techniques have a controversial history
[<xref ref-type="bibr" rid="B6">6</xref>]. Such social and cultural values might also be impacted by the specific features of the disorder, and attention to context is warranted
[<xref ref-type="bibr" rid="B13">13</xref>]. Limited knowledge exists regarding factors, which might impede or encourage acceptability of neuromodulation interventions for both sufferers, health professionals and the general public
[<xref ref-type="bibr" rid="B14">14</xref>].</p></sec></sec></sec><sec sec-type="conclusions"><title>Conclusions</title><p>This article can be seen as a first step in the attempt to shed light on specific ethical issues that the use of neuromodulation techniques pose for patients with AN. Although promising, findings are mixed and future studies are warranted to demonstrate their efficacy. The risks for rTMS are currently low and thus further experimental trials can proceed and ensure consistent evidence for the efficacy of the neuromodulation techniques. However, considering the current limited knowledge, careful attention to context and practice should follow. Ethical issues such as careful informed consent and clinical sensitivity have to be taken into account when gaining this knowledge and applying these techniques. Further, if these methods prove effective, it is nevertheless relevant that patients, families, caregivers, treatment providers, and the public-at-large are involved in discussions regarding potential ethical dilemmas.</p><p>In this article, we have applied a principle-based approach as described by Beauchamp and Childress
[<xref ref-type="bibr" rid="B47">47</xref>]. Other perspectives exist and could have been followed; for example, a deontological approach would have highlighted human worth and dignity. However, our approach addressed concerns for authenticity and meaning without reference to intention-based ethical theories. The utilitarian perspective has been covered by the principle of beneficence. Various types of utilitarianism exist, but they are all faced with challenges when the knowledge on risks and benefits is vague, uncertain, or absent. Correspondingly, procedural approaches, such as discourse ethics
[<xref ref-type="bibr" rid="B48">48</xref>] and “accountability for reasonableness”
[<xref ref-type="bibr" rid="B49">49</xref>,<xref ref-type="bibr" rid="B50">50</xref>] are relevant, especially when assessing health care interventions under uncertainty. However, they may face challenges in AN as the persons themselves may refuse to be participants in the discourse and deliberation.</p><p>In conclusion, we argue that investigations of neurostimulation techniques such as rTMS in AN go beyond establishing efficacy to a broader phenomenological, first-person understanding of how technologies affect users’ lives. As such, future studies and ethical debates about the efficacy and acceptability of these methods should therefore investigate attitudes both among health providers and patients. Finally, considering that research on neurobiology of AN will most likely continue to rapidly develop in concert with NIMH research priorities, concomitant ethical debates should follow in parallel with such developments.</p></sec><sec><title>Competing interests</title><p>The authors declare that they have no competing interests.</p></sec><sec><title>Authors’ contributions</title><p>AC drafted the manuscript, completed the literature search and analysis of the material. DR contributed to developing the manuscript, presentation of review material, as well as revising for intellectual content and language editing. FS and BH contributed to validation and developing of ideas, and were involved in approval of final draft of the paper. All authors read and approved the final manuscript.</p></sec></body><back><sec><title>Acknowledgements</title><p>The work on this paper has been supported by internal funds from the Regional Eating Disorder Unit, Department of Mental Health and Addiction, Oslo University Hospital, Ullevål. 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