Box 1
Continuing severe depression is associated with reduced educational attainment and quality of life, as well as increased risk of substance abuse and suicide,1,2 which is the second leading cause of death in individuals age 10 to 24 years.3 Given the substantial morbidity and mortality associated with adolescent depression, interventional psychiatry treatments are under-researched and underutilized in pediatric patients. Interventional antidepressants in adults include electroconvulsive therapy (ECT), repetitive transcranial magnetic stimulation (rTMS), and, most recently, ketamine.
Electroconvulsive therapy is the most effective therapy available for depression in adults, alleviating depressive symptoms in treatment-refractory patients and outperforming both pharmacotherapy4 and rTMS.5 Despite its track record of effectiveness and safety in adults, ECT continues to suffer considerable stigma.4 Cognitive adverse effects and memory problems in adults are generally self-limited, and some aspects of cognition actually improve after ECT as depression lifts.6 The combination of stigma and the concern about possible cognitive adverse effects during periods of brain development have likely impeded the rigorous testing of ECT in treatment-refractory pediatric patients. Several case series and other retrospective analyses suggest, however, that ECT has strong efficacy and limited adverse effects in adolescents who have severe depression or psychotic symptoms.7-9 Despite these positive preliminary data in pediatric patients, and a large body of literature in adults, no controlled trials of ECT have been conducted in the pediatric population, and it remains a rarely used treatment in severe pediatric mental illness.
Repetitive transcranial magnetic stimulation is a technique in which magnetic stimulation is used to activate the left dorsolateral prefrontal cortex (DLPFC), a target thought to be important in the pathophysiology of MDD. Repetitive transcranial magnetic stimulation is FDAapproved to treat medication-refractory major depressive disorder (MDD) in adults, and has been shown to be effective as both a monotherapy10 and an adjunctive treatment.11 The estimated number needed to treat (NNT) for rTMS ranges from 6 to 8, which is quite effective, although less so than ECT (and probably initial pharmacotherapy).5 Similar to ECT, however, there are no large randomized controlled trials (RCTs) in children or adolescents. Pilot RCTs12 and open trials13 suggest that DLPFC rTMS may be effective as an adjunctive treatment, speeding or augmenting response to a selective serotonin reuptake inhibitor in adolescents with MDD. Larger trials studying rTMS in pediatric patients are needed. While rTMS is generally well tolerated, disadvantages include the time-consuming schedule (the initial treatment is typically 5 days/week for several weeks) and local adverse effects of headache and scalp pain.
Ketamine, which traditionally is used as a dissociative anesthetic, is a rapidly emerging novel treatment in adult treatment-refractory MDD. It acts quickly (within hours to days) and cause significant improvement in difficult symptoms such as anhedonia14 and suicidal ideation.15 In adult studies, ketamine has a robust average effect size of >1.2, and an NNT ranging from 3 to 5 in medication-refractory patients.16,17 Ketamine is a glutamatergic modulator, acting outside of the monoamine neurochemical systems traditionally targeted by standard antidepressants.16 The efficacy of ketamine in treatment-refractory adults is impressive, but the effects of a single treatment are ephemeral, dissipating within 1 to 2 weeks, which has led to significant discussion surrounding optimal dosing strategies.16 Although small RCTs in pediatric patients are currently underway, at this time, the only evidence for ketamine for pediatric MDD is based on case series/report data18,19 which was positive.
For all of these interventional modalities, it is critical to refer children with treatmentrefractory disorders to interventionists who have appropriate experience and monitoring capabilities.
References
1. Weissman MM, Wolk S, Goldstein RB, et al. Depressed adolescents grown up. JAMA.1999;281(18):1707-1713.
2. Fergusson DM, Woodward LJ. Mental health, educational, and social role outcomes of adolescents with depression. Arch Gen Psychiatry. 2002;59(3):225-231.
3. Centers for Disease Control and Prevention. National Vital Statistics System. Deaths, percent of total deaths, and death rates for the 15 leading causes of death in 5-year age groups, by race and sex: United States, 1999-2015. Centers for Disease Control and Prevention. https://www.cdc.gov/nchs/nvss/mortality/lcwk1.htm. Published October 23, 2017. Accessed May 2, 2019.
4. UK ECT Review Group. Efficacy and safety of electroconvulsive therapy in depressive disorders: a systematic review and metaanalysis. Lancet. 2003;361(9360):799-808.
5. Berlim MT, Van den Eynde F, Daskalakis ZJ. Efficacy and acceptability of high frequency repetitive transcranial magnetic stimulation (rTMS) versus electroconvulsive therapy (ECT) for major depression: a systematic review and meta-analysis of randomized trials. Depress Anxiety. 2013;30(7):614-623.
6. Semkovska M, McLoughlin DM. Objective cognitive performance associated with electroconvulsive therapy for depression: a systematic review and meta-analysis. Biol Psychiatry. 2010;68(6):568-577.
7. Jacob P, Gogi PK, Srinath S, et al. Review of electroconvulsive therapy practice from a tertiary child and adolescent psychiatry centre. Asian J Psychiatr. 2014;12(1):95-99.
8. Zhand N, Courtney DB, Flament MF. Use of electroconvulsive therapy in adolescents with treatment-resistant depressive disorders: a case series. J ECT. 2015;31(4):238-245.
9. Puffer CC, Wall CA, Huxsahl JE, et al. A 20 year practice review of electroconvulsive therapy for adolescents. J Child Adolesc Psychopharmacol. 2016;26(7):632-636.
10. Berlim MT, van den Eynde F, Tovar-Perdomo S, et al. Response, remission and drop-out rates following high-frequency repetitive transcranial magnetic stimulation (rTMS) for treating major depression: a systematic review and meta-analysis of randomized, double-blind and sham-controlled trials. Psychol Med. 2014;44(2):225-239.
11. Liu B, Zhang Y, Zhang L, et al. Repetitive transcranial magnetic stimulation as an augmentative strategy for treatment-resistant depression, a meta-analysis of randomized, double-blind and sham-controlled study. BMC Psychiatry. 2014;14:342.
12. Huang ML, Luo BY, Hu JB, et al. Repetitive transcranial magnetic stimulation in combination with citalopram in young patients with first-episode major depressive disorder: a double-blind, randomized, sham-controlled trial. Aust N Z J Psychiatry. 2012;46(3):257-264.
13. Wall CA, Croarkin PE, Sim LA, et al. Adjunctive use of repetitive transcranial magnetic stimulation in depressed adolescents: a prospective, open pilot study. J Clin Psychiatry. 2011;72(9):1263-1269.
14. Lally N, Nugent AC, Luckenbaugh DA, et al. Anti-anhedonic effect of ketamine and its neural correlates in treatment-resistant bipolar depression. Transl Psychiatry. 2014;4:e469. doi: 10.1038/tp.2014.105.
15. Ballard ED, Ionescu DF, Vande Voort JL, et al. Improvement in suicidal ideation after ketamine infusion: relationship to reductions in depression and anxiety. J Psychiatr Res. 2014;58:161-166.
16. Newport DJ, Carpenter LL, McDonald WM, et al. Ketamine and other NMDA antagonists: early clinical trials and possible mechanisms in depression. Am J Psychiatry. 2015;172(10):950-966.
17. McGirr A, Berlim MT, Bond DJ, et al. A systematic review and meta-analysis of randomized, double-blind, placebo-controlled trials of ketamine in the rapid treatment of major depressive episodes. Psychol Med. 2015;45(4):693-704.
18. Dwyer JB, Beyer C, Wilkinson ST, et al. Ketamine as a treatment for adolescent depression: a case report. J Am Acad Child Adolesc Psychiatry. 2017;56(4):352-354.
19. Cullen KR, Amatya P, Roback MG, et al. Intravenous ketamine for adolescents with treatment-resistant depression: an open-label study. J Child Adolesc Psychopharmacol. 2018;28(7):437-444.
Box 2
Efficacy
- Selective serotonin reuptake inhibitors are the most effective pharmacologic treatment we have for pediatric depression, OCD, and anxiety
- More than one-half of children who are prescribed SSRIs have a significant improvement, regardless of condition
- Based on current estimates, we need to treat 4 to 6 children with an SSRI to find one that will improve who would not improve with placebo
- The clinical benefits of SSRIs generally take a while to accrue; therefore, it is advisable to take the medication for at least 2 to 3 months before concluding that it is ineffective
- In addition to medication, evidence-based psychotherapies provide significant benefit for pediatric depression, OCD, and anxiety
Tolerability
- Most commonly prescribed pediatric antidepressants have been used safely in children for 2 to 3 decades. The safety profiles of SSRIs are among the best of any medications used for children and adolescents
- While many children get better when taking these medications, it’s important that we also talk about potential adverse effects. Some children will experience sleep problems (either sleepier than usual or difficulty sleeping), changes in energy levels, headache, gastrointestinal upset, and dry mouth. These are most likely at the beginning of treatment, or when we increase the dose; they usually are time-limited and go away on their own
- Often adverse effects occur first and the benefits come later. Because it may take at least a few weeks to start to see the mood/anxiety benefits, it’s important for us to talk about any adverse effects your child experiences and remember that they usually are short-lived
Suicidality
- The FDA placed a “black-box” warning on antidepressants after pediatric studies found a small but statistically significant increased risk of reporting suicidal thoughts or behaviors over the short-term compared with placebo
- The increased risk of spontaneously reporting suicidal ideation was quite small. Studies suggested that one would need to treat 100 to 140 children to see 1 child report suicidal ideation compared to placebo. Suicidal ideation is a common symptom in children with depression and anxiety
- Studies found no increased risk when suicidal ideation was systematically assessed using structured rating scales
- In the studies evaluated, there were no completed suicides by patients taking medication or placebo
- Population studies show that higher rates of antidepressant prescriptions are associated with lower rates of attempted and completed teen suicide, which underscores that in general, these medicines treat the underlying causes of suicidality
- No scientific consensus exists on whether these medications are truly associated with an increased risk of new-onset suicidal ideation, or if this association is due to other factors (eg, improvement in anxiety and depressive symptoms that make patients more comfortable to report suicidal ideation spontaneously)
- Regardless, the FDA recommends frequent monitoring of children for suicidal thoughts when these medications are started. This should be done anyway in children experiencing depression and anxiety, and it’s why we will plan to have more frequent appointments as the medication is initiated
OCD: obsessive-compulsive disorder; SSRIs: selective serotonin reuptake inhibitors