Ketamine Therapy Helps Reduce Suicidal Thoughts

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This improvement was seen as early as four hours following ketamine treatment and lasted on average three days, and up to a week.

Lead author Merve Mollaahmetoglu, of the University of Exeter, said: “Our research is the most comprehensive review of the growing body of evidence on the therapeutic effects of ketamine to date. Our findings suggest that ketamine may be useful in providing rapid relief from depression and suicidal thoughts, creating a window of opportunity for further therapeutic interventions to be effective. It’s important to note that this review examined ketamine administration in carefully controlled clinical settings where any risks of ketamine can be safely managed.

For other psychiatric disorders, including anxiety disorders, post-traumatic stress disorders and obsessive-compulsive disorders, there is early evidence to suggest the potential benefit of ketamine treatment. Moreover, for individuals with substance use disorders, ketamine treatment led to short-term reductions in craving, consumption and withdrawal symptoms.

Published in the British Journal of Psychiatry Open, the review synthesises the evidence from a growing field of research into the potential benefits of ketamine for conditions for which there are limited effective treatments. The review included 33 systematic reviews, 29 randomised control trials, and 21 observational studies.

Ketamine’s effects on depressive symptoms and suicidal thoughts are supported by numerous systematic reviews and meta-analyses, which provide an exhaustive overview of research in a given topic. These are considered to have the highest strength of evidence compared to other types of studies, increasing confidence in the evidence for ketamine’s antidepressant and anti-suicidal effects.

However, ketamine’s therapeutic effects for psychiatric conditions other than depression and suicidal thoughts are based on small number of studies that did not randomize people into different treatment arms. These effects require replication in larger randomized placebo-controlled trials, which are considered as gold standard.

The authors noted a number of difficulties in the research field, which they recommend that future studies should seek to address. One factor is the bias created because participants realize they have been given ketamine, rather than a saline solution. Senior author Professor Celia Morgan, of the University of Exeter, said: “We’re finding that ketamine may have promising benefits for conditions that are notoriously hard to treat in clinic. We now need bigger and better-designed trials to test these benefits.

For example, due to ketamine’s unique subjective effects participants may be able to tell whether they have been given ketamine or a saline solution as the placebo, potentially creating an expectation about the effects of the drug. This effect may be better controlled by having active placebo-controlled trials, where the control group receives another drug with psychoactive properties.”

A number of questions remain unanswered in the research field, including the optimal dose, route of administration and number of doses of ketamine treatment. There is also a need for further research on the added and interactive benefit of psychotherapy alongside ketamine treatment.

Additionally, the importance of ketamine’s acute subjective effects in its therapeutic benefits has not been fully explored. More research is also needed on how to optimise participants’ preparation for ketamine treatment and the setting in which ketamine treatment is delivered.

The research involved collaboration with the University of British Columbia, and received support from the Society for the Study of Addiction. The paper is entitled ‘Ketamine for the treatment of mental health and substance use disorders: a comprehensive systematic review’, and is published in the British Journal of Psychiatry Open.

Source: Eurekalert



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