Revise Treatment and management of anxiety disorders and fear-related disorders for Cambridge 9990 (1.4.3)

Systematic Desensitisation is a behavioural therapy developed by Joseph Wolpe, based on classical conditioning principles. It aims to extinguish a phobic response by replacing it with a feeling of relaxation, a process known as counter-conditioning. The therapy proceeds through three distinct stages. First, the client is taught deep muscle and breathing relaxation techniques. Second, the client and therapist collaboratively construct a 'fear hierarchy', a list of phobic situations ranked from least to most anxiety-inducing. Finally, the client works through the hierarchy, being exposed to each stage (either in imagination, 'in vitro', or in real life, 'in vivo') while in a state of deep relaxation. The principle of 'reciprocal inhibition' dictates that fear and relaxation cannot coexist, so the relaxation response gradually overrides the fear response.

Flooding is a more extreme form of behavioural therapy that involves immediate and prolonged exposure to the most frightening version of the phobic stimulus. Unlike the gradual approach of SD, flooding forces the individual to confront their fear directly and continuously, without the opportunity for avoidance. The therapy operates on the principle of extinction. The intense anxiety experienced cannot be sustained indefinitely, and when the feared negative outcome does not occur, the conditioned link between the stimulus and the fear response is broken. The patient learns that the stimulus is harmless. While it can be much faster than SD, it is a highly traumatic experience that requires fully informed consent and can lead to high dropout rates.

Cognitive Behavioural Therapy (CBT) is a talking therapy that focuses on how thoughts, beliefs, and attitudes (cognitions) affect feelings and actions (behaviours). The core principle is that it is not events themselves that cause anxiety, but our interpretation of them. The therapist and client work collaboratively to identify and challenge specific irrational or maladaptive thought patterns, known as 'cognitive distortions' (e.g., catastrophising). Techniques like Socratic questioning and thought records are used to evaluate these beliefs against evidence. The therapy also includes a behavioural component, where clients engage in 'behavioural experiments' or homework tasks to test their assumptions and practice more adaptive behaviours. CBT is highly effective for a wide range of anxiety disorders, including GAD and social anxiety.

The biological approach treats anxiety disorders as having a physiological cause, such as a neurochemical imbalance. The two main classes of drugs used are Benzodiazepines (BZs) and antidepressants, typically Selective Serotonin Reuptake Inhibitors (SSRIs). BZs (e.g., Diazepam) are anxiolytics that work by enhancing the activity of the neurotransmitter GABA, which has a calming effect on the central nervous system. They are fast-acting but carry a risk of dependency. SSRIs (e.g., Fluoxetine) are now often the first-line treatment. They work by increasing the levels of serotonin in the brain, which helps regulate mood and anxiety. While effective for managing symptoms, drugs do not address the underlying cognitive or behavioural causes of the disorder, and symptoms may return upon cessation.