Use of Ketamine in Adolescent Mood Disorders and Suicidality
David S. Mathai,
Alexis G. McCathern, Andrew G. Guzick, S
ophie C. Schneider, Saira A. Weinzimmer, Sandra L. Cepeda, Albert Garcia-Romeu, Eric A. Storch
Published Online: 14 Oct 2021
The decision to use psychotropic treatments in children and adolescents is complex and challenged by noteworthy social and ethical criticisms of modern practice. Professional psychiatric associations have responded with emphasis on an integrated “developmental perspective," namely approaching the decision for pharmacological intervention by considering the unique context of each child, their family, and the dynamic environment. Notably, international guidelines differ in weight assigned to nonpharmacological alternatives to treatment, with implications on how interventions are relatively available, recommended, and implemented. However, the risks of medicating adolescents must be considered pragmatically and alongside the consequences of untreated psychiatric illness.
Pediatric mood disorders are associated with interpersonal difficulties, poor academic performance, occupational instability, and other mood or substance use disorders later in life. Earlier onset of illness and prolonged periods of depression in children have also been linked to worse long-term prognosis.
Troublingly, the prevalence of mood disorders in adolescents appears to be increasing, for whom suicide remains a leading, and rising, cause of death. Although a sense of clinical urgency is apparent, pharmacological interventions in these populations are few in number and variably efficacious. Treatment is further thwarted by the slow onset, low tolerability, paradoxical suicide risk, and long-term adverse effects of current pharmacotherapies.
Ketamine has gained popularity as a mechanistically novel, rapid-acting, and ultimately hopeful intervention for treatment-resistant depression and suicidality in adults. The use of ketamine in children has been historically limited to anesthetic and analgesic applications, although a growing number of studies suggest broader value of the drug in the treatment of psychiatric mood disorders.
For instance, a recent randomized controlled trial of intravenous ketamine in 17 adolescents (age 13–17) with major depression found rapid significant reductions in depressive symptoms lasting as long as 2 weeks post-treatment and no serious adverse effects associated with ketamine. While caution is needed in interpreting early findings and assessing both safety and efficacy of ketamine in minors, this research agenda merits keen attention considering the rates of illness and treatment resistance in this population. Examination of parental attitudes toward ketamine is also vital as interest in ketamine treatment for minors continues to develop.
As parents maintain decision-making capacity over their child's medical care, parental consent is a key factor in the adoption of new treatments for adolescents. To our knowledge, no existing studies have examined parental attitudes toward using ketamine to treat childhood psychiatric disorders. There are limited empirical data on what use of ketamine in children is deemed acceptable by parents at all. In one study examining parental attitudes to using ketamine for procedural sedation and analgesia in children with hematologic malignancy, parents generally favored using ketamine for pain control if it was found to be effective. Parents also reported dissatisfaction when children had adverse, including hallucinogenic-type, effects.
Other broad concerns about the psychiatric use of ketamine in adults may be represented in parents of minors who may benefit from treatment. For example, several groups advocate for careful selection of patients who are offered ketamine as treatment due to abuse risk. Preclinical data suggesting that ketamine may be neurotoxic in certain contexts are especially consequential for the vulnerable developing brain. Investigation into parental decision-making processes involving ketamine is of high priority, given the necessary role of parents in consenting to a treatment that may offer unique benefits in youth but is not without risks.
In this study, we examined parental perceptions of ketamine for the treatment of adolescent mood disorders and suicidality. Parents were asked questions to determine their concerns related to psychiatric use of ketamine, acceptability of this treatment, and their attitudes toward treatment. As a chiral compound, ketamine exists as a mixture of (
S)-ketamine (esketamine) and (
R)-ketamine (arketamine) enantiomers, which have been studied independent of racemic ketamine and with esketamine distinctly carrying United States Food and Drug Administration (FDA) approval for psychiatric use in adults. While initial preclinical evidence suggests pharmacological and behavioral divergence between these forms, the clinical significance of these findings is not yet known.
As such, ketamine and esketamine were generally assessed together in our survey and without discrimination. Congruent with our instrument wording and for the purpose of simplicity: “ketamine” will be used hereafter to capture data for both esketamine and ketamine. Overall, we had three exploratory aims as follows: (1) to characterize perceptions, acceptability, preferences, and concerns surrounding ketamine, (2) to compare acceptability of ketamine between different clinical/diagnostic presentations, and (3) to identify demographic variables associated with ketamine acceptability.
Discussion
The current study is the first to our knowledge to examine parental perceptions of ketamine as a treatment for pediatric mood disorders and suicidality. Parents recruited through MTurk completed an online survey that assessed concerns related to psychiatric use of ketamine, ratings of treatment acceptability, and factors related to treatment acceptability—including familial experiences with mental health conditions and treatments. Despite the experimental nature of ketamine treatment in minors, most parents reported positive attitudes toward use of ketamine in response to clinical vignettes involving MDD, bipolar disorder, and suicidality in adolescents.
Ketamine acceptability for suicidality was greater than that for bipolar disorder and MDD, while acceptability for bipolar disorder and MDD did not significantly differ, indicating greater openness to novel treatments for adolescent suicidality. This finding is consistent with the known burden of suicide in adolescents and supports the argument that clinical acuity should be factored into decisions involving interventional treatments. Moreover, when considered alongside evidence that ketamine may confer antisuicidal properties independent of its antidepressant effects, there is emerging rationale for short-term applications of ketamine in acute psychiatric settings.
However, these data must be reconciled with other uncertainties. For instance, there have been indicators of increased risk for suicidal ideation and completed suicide in certain adults receiving or following discontinuation (McIntyre et al. 2021) of treatment with esketamine. There is also insufficient research into ketamine's “rebound effects,” which have been demonstrated for other central nervous system drugs and imply that the transient benefits of symptomatic relief are tempered by risks of subsequent relapse and iatrogenic drug-seeking behavior.
Responses here point to preference for short-term applications of ketamine, such as limited drug sessions or less than 1 month of treatment for psychiatric stabilization, although a slight majority of parents conveyed openness to a longer course of treatment until symptoms improved. Importantly, there is still considerable hesitancy among clinical experts about what maintenance treatment with ketamine should look like, with no straightforward answers and perhaps varying widely on an individual basis.
A conservative approach to treatment, then, might best serve existing concerns. For instance, it has been proposed that use of ketamine in a psychotherapeutic context improves outcomes and decreases long-term need for medications in adults. This approach contrasts markedly with other strategies to sustain the efficacy of ketamine by increasing frequency of dosing. Parents reasonably may be interested in drug- or time-limited clinical paradigms such as ketamine-assisted psychotherapy in children.
For all indications assessed in our study, the primary concerns around ketamine involved its potential side effects and lack of FDA approval and, to a lesser extent, concerns about abuse potential, age of the child, or the child's capacity to make their own decision regarding treatment.
Parents were largely agreeable to treatment in children over 6 years of age, although more so for children older than 12. Parents were more comfortable with nasal and oral ketamine over more invasive, intravenous or intramuscular, routes of administration. Parental factors such as higher degree of education, personal history of psychiatric illness, familiarity with psychological treatments, and especially, comfort using other interventions in their children predicted greater acceptability toward ketamine. Prior knowledge of ketamine did not affect how parents rated acceptability.
Although there is accumulating evidence for the efficacy, safety, and tolerability of ketamine in younger populations, these remain open inquiries and are reflected in concerns reported here. In children, treatment-emergent dissociation, nausea, and hemodynamic changes are most commonly attributed to ketamine and generally mild and transient in nature. These safety data converge with adult reports, which have further characterized the possibility of rare but more severe adverse events involving cardiovascular, genitourinary, neurocognitive, and psychiatric systems and including abuse liability. An increased neurodevelopment sensitivity to ketamine in adolescents is theoretically plausible and certainly requires further investigation, although may depend on the dose and chronicity of administration.
Consistent with an ongoing understanding of the risks and benefits of treatment, the American Academy of Child and Adolescent Psychiatry (AACAP) does not yet recommend use of ketamine outside of research protocols. Candidate adolescents and their families are likely served best, then, by ongoing longitudinal and rigorous study of ketamine, which might be used toward FDA evaluation and approval.
As the case with approval of esketamine in adults, the way forward will presumably involve patentable and comparable ketamine derivatives, for which trials are already underway. Studies in adults establishing the benefits of intravenous, intranasal, oral, and intramuscular formulations of ketamine will require replication in children. Ultimately, provider sensitivity to parent knowledge, apprehension, and preferences as explored here could meaningfully guide conversations around psychoeducation, treatment readiness, and drug consent.
Other central questions remain to be answered. In adults, there is still no consensus on the appropriate position of ketamine in treatment algorithms, its optimal delivery, and the appropriate context for safe administration. These parameters may differ for minors. Although not addressed in this study, parental attitudes toward ketamine could be additionally shaped by knowledge of its dose-dependent psychedelic and dissociative effects, which have been shown to variably correlate with therapeutic outcome in adults.
Other psychedelic agents being explored in adults, such as psilocybin and 3,4-methylenedioxymethamphetamine, appear safe and effective when administered with adequate psychological support, consistent with best practices in hallucinogen research. However, the ethics of consent for and induction of altered states of consciousness in children requires careful examination.
An important limitation of this study was the use of crowdsourced convenience sampling as opposed to random sampling or clinical recruitment, bringing into question the ability to make larger, population-level inferences. Others have alternatively suggested that demographic characteristics of MTurk users are more representative of the general population than those of participants recruited from laboratory based samples. Given concerns about data quality associated with MTurk, we used stringent exclusion criteria and various mitigation strategies consistent with best practice to screen out automated, careless, or fraudulent reporting However, such strategies have also contributed to increasingly professionalized MTurk samples, with potential for bias due to “practice effects” and greater familiarity with social science research among qualified respondents.
Our findings further indicate disproportionate sampling of those with college or higher education, at a rate approximately double compared with the United States general adult population. It is possible, then, that familiarity and comfort with broad psychological treatments, knowledge of, and perhaps even acceptability toward ketamine are overrepresented in the current sample. As such, one valuable direction of study would be to replicate these findings in a clinical sample. Further work is needed to establish the reliability of this platform, although MTurk demonstrates promise as a tool for target sampling of special populations.
Conclusion
Although preliminary, our findings suggest that parents generally have positive attitudes toward the development and use of ketamine for treatment-resistant mood disorders and suicidality in youth. Our study provides orientation for further investigation and dissemination of knowledge around parental attitudes toward ketamine—an innovative and emerging treatment for adolescent mental health.
Clinical Significance
Ketamine has gained popularity as a mechanistically novel, rapid-acting, and promising psychiatric intervention in adults and is now being explored in adolescents. Investigation into parental decision-making processes involving ketamine is of high priority, given the necessary role of parents in consenting to treatment. We examined parental attitudes toward the emerging use of ketamine in adolescent mood disorders and suicidality and found high acceptability toward psychiatric applications of ketamine, with concerns primarily involving drug side effects and lack of FDA approval. Although ketamine is still an experimental treatment in children, these findings suggest that parents have interest in the application of ketamine as a treatment for pediatric mood disorders and point to future directions for research and clinical orientation.
*From the article (including references) here :