Ketamine infusion therapy

What is ketamine infusion therapy?

Ketamine infusion therapy is a treatment that involves the administration of low doses of ketamine through an intravenous (IV) drip. It’s primarily used to treat certain mental health conditions, particularly depression that has not responded to conventional treatments. Ketamine, originally developed as an anaesthetic, has been found to have rapid-acting antidepressant effects, making it a potential option for individuals with treatment-resistant depression, post-traumatic stress disorder (PTSD), and other mood disorders.

Unlike traditional antidepressants, which can take weeks to show an effect, ketamine infusion therapy may produce noticeable improvements in mood and symptoms within hours or days. Evidence points to the psychotherapy in combination with ketamine being more effective. The therapy is typically administered in a clinical setting under medical supervision.

How does it work?

Ketamine affects the brain differently from conventional antidepressants. It primarily acts on the glutamate system, specifically the N-methyl-D-aspartate (NMDA) receptor, which plays a crucial role in synaptic plasticity and neural communication. By blocking NMDA receptors, ketamine increases the release of neurotransmitters like glutamate, which can help promote the formation of new neural connections and improve mood regulation.

Another important effect of ketamine is its ability to reduce inflammation in the brain and increase levels of brain-derived neurotrophic factor (BDNF), a protein essential for neural growth and repair. This combination of mechanisms is thought to contribute to ketamine’s rapid and sustained antidepressant effects in some patients.

Who is a suitable patient for ketamine infusion therapy?

Ketamine infusion therapy is typically recommended for patients with treatment-resistant depression, meaning they have not responded to at least two different antidepressant medications. It may also be considered for individuals with PTSD, severe anxiety disorders, and, in some cases, chronic pain conditions such as complex regional pain syndrome (CRPS).

Patients who are pregnant, have a history of substance abuse, or have certain medical conditions such as uncontrolled high blood pressure or psychotic disorders may not be suitable candidates for ketamine therapy. A thorough medical and psychiatric assessment is necessary before starting treatment.

What's involved in ketamine infusion therapy?

Ketamine infusion therapy is administered in a controlled clinical environment, typically under the supervision of a psychiatrist or anaesthetist. During each session, a low dose of ketamine is delivered via an IV drip over a period of approximately 40 minutes to an hour. The dosage and frequency of infusions vary depending on the patient's condition and response to treatment.

Patients may experience mild dissociative effects during the infusion, such as altered perception of time and space, but these effects typically wear off shortly after the session ends. Some patients may require multiple sessions to achieve a sustained improvement in symptoms. A typical treatment course consists of several infusions over the course of a few weeks, followed by maintenance infusions if necessary.

How can I prepare for ketamine infusion therapy?

Before starting ketamine infusion therapy, patients are usually required to undergo a thorough medical and psychiatric evaluation. This includes a review of their medical history, current medications, and any pre-existing conditions that might affect treatment safety.

On the day of the infusion, patients are generally advised to fast for a few hours beforehand to minimise the risk of nausea. It is also recommended to arrange for someone to accompany them home after the session, as mild sedation and dissociation may temporarily impair coordination and concentration.

What happens after ketamine infusion therapy?

After the infusion, patients are monitored for a short period to ensure there are no immediate side effects. Some individuals may experience mild dizziness, nausea, or a temporary increase in blood pressure, but these effects typically resolve quickly. Patients are advised to avoid driving or operating heavy machinery for the rest of the day.

The antidepressant effects of ketamine infusion therapy can be rapid, with some patients reporting improvements within hours. However, the duration of symptom relief varies. Some patients may require additional infusions to maintain the benefits, while others may combine ketamine therapy with other treatments such as psychotherapy or medication.

What specialist performs ketamine infusion therapy?

Ketamine infusion therapy is typically administered by specialists with experience in both mental health and anaesthesia. This includes psychiatrists who specialise in treatment-resistant depression and anaesthetists with expertise in administering IV ketamine. In some cases, pain specialists may also be involved in providing ketamine therapy for chronic pain conditions.

The treatment should always be carried out in a regulated medical setting where patients can be monitored for potential side effects. Clinics offering ketamine infusion therapy must adhere to strict safety protocols to ensure the treatment is both effective and safe for patients.