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Post-traumatic stress disorder (PTSD) is a mental health condition that's triggered by a terrifying event — either experiencing it or witnessing it. Symptoms may include flashbacks, nightmares and severe anxiety, as well as uncontrollable thoughts about the event. Unsplash

Repeated intravenous (IV) ketamine infusions significantly reduce symptom severity in individuals with chronic post-traumatic stress disorder (PTSD) and the improvement is rapid and maintained for several weeks afterward, researchers have found.

“The data suggests repeated IV ketamine is a promising treatment for people who suffer from PTSD and provides evidentiary support to warrant future studies to determine how we can maintain this rapid and robust response over time,” said lead author Adriana Feder, Associate Professor of Psychiatry at the Icahn School of Medicine at Mount Sinai.


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For the study, published September in the American Journal of Psychiatry journal, participants were randomly assigned to receive six infusions of ketamine, administered three times per week over two consecutive weeks, compared to six infusions of the psychoactive placebo control midazolam administered and evaluated over the same schedule.

Individuals in this study had severe and chronic PTSD from civilian or military trauma, with median duration of 14 years and nearly half of the sample taking concomitant psychotropic medications. The primary traumas reported by participants included sexual assault of molestation, physical assault or abuse, witnessing violent assault or death, having survived or responded to the 9/11 attacks, and combat exposure.


PTSD symptoms are generally grouped into four types: intrusive memories, avoidance, negative changes in thinking and mood, and changes in physical and emotional reactions. Unsplash

All study participants were assessed at baseline, at week 1 and week 2, as well as on each infusion day by teams of trained study raters who administered the Clinician Administered PTSD Scale for DSM-5 and the Montgomery-Asberg Depression Rating Scale (MADRS), standard rating scales for the assessment of PTSD and depression.

Significantly more participants in the ketamine group (67 per cent) attained at least 30 per cent or more reduction in symptoms from baseline at week two than those in the midazolam group (20 per cent).

Furthermore, ketamine infusions were associated with marked improvements across three of the four PTSD symptom clusters – intrusions, avoidance, and negative alterations in cognitions and mood.

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In the subsample of ketamine responders, improvement in PTSD symptoms was rapid, observed 24 hours after the first infusion, and was maintained for a median of 27.5 days following the primary outcome assessment day.

In addition to PTSD symptom improvement, the ketamine group exhibited a markedly greater reduction in comorbid depressive symptoms than the midazolam group, which is notable given the high comorbidity of depression in individuals with PTSD. (IANS)


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