1.10 - Anxiety & Fear-related Disorders: Diagnostic Criteria
Understanding anxiety and fear-related disorders
Anxiety and fear-related disorders involve strong feelings of worry or fear that go beyond normal reactions to stress. To understand them properly, we start with how they are diagnosed, ensuring that symptoms are not due to other health issues.
Diagnostic criteria using ICD-11
The International Classification of Diseases (ICD-11) provides guidelines for diagnosing anxiety disorders. This system helps professionals identify these conditions consistently.
Key requirements for diagnosis:
- Persistent symptoms - The anxiety or fear must occur almost every day for several months.
- Distress - The person must feel significantly upset or troubled by their symptoms.
- Disruption to life - Symptoms interfere with daily activities, such as work, school, or relationships.
- Exclusion of other causes - Other medical or mental health conditions must be ruled out as the source of the symptoms.
Types of anxiety and fear-related disorders
There are several specific types of anxiety and fear-related disorders, each with its own set of symptoms. These disorders share the core feature of excessive fear or worry, but they differ in what triggers them and how they affect the body and mind.
Key types and their symptoms
| Type of disorder | Description | Main symptoms |
|---|---|---|
| Generalised anxiety disorder (GAD) | A condition involving constant worry about various aspects of life, without a specific trigger. This leads to ongoing tension. | Muscle aches and pains, insomnia (difficulty sleeping), restlessness, irritability, poor concentration |
| Agoraphobia | Intense fear of situations where escape might be difficult or help unavailable, often linked to fear of having a panic attack in public. | Excessive fear or anxiety when outside the home, avoidance of public places like crowds or open spaces |
| Specific phobia (blood-injection-injury type) | An extreme fear response to blood, needles, or injuries, which can cause physical reactions beyond just feeling scared. | Decreased blood pressure leading to fainting (known as vasovagal syncope, a sudden drop in heart rate and blood pressure causing loss of consciousness) |
Measuring anxiety and fear-related disorders
To assess the severity of anxiety disorders, professionals use self-report questionnaires. These tools ask people to rate their experiences, providing a way to measure symptoms objectively. They can be completed as questionnaires or used in structured interviews, where a clinician asks the questions directly. This helps track symptoms over time and decide on treatment.
Self-report questionnaires for assessment
Two common measures are the Generalised Anxiety Disorder Assessment (GAD-7) and the Blood Injection Phobia Inventory (BIPI). These tools focus on different aspects of anxiety, using scales to quantify how often symptoms occur.
| Feature | Generalised Anxiety Disorder Assessment (GAD-7) | Blood Injection Phobia Inventory (BIPI) |
|---|---|---|
| Number of items | Seven items, each rated based on how often symptoms occurred | 18 situations related to blood and needles, each rated on the frequency of 27 reactions (cognitive, biological, and behavioural), resulting in 486 data points per person |
| What is measured? | Frequency of generalised anxiety symptoms over the last two weeks | Situational anxiety (during exposure) and anticipatory anxiety (fear before exposure) related to blood and injections |
| Answer format | Four-point scale from 0 (not at all) to 3 (nearly every day) | Four-point scale from 0 (never) to 3 (always) |
| Sample item | "Trouble relaxing?" with options: Not at all (0), Several days (1), More than half the days (2), Nearly every day (3) | "When I see an injured person after an accident, bleeding in the road or on the television: I feel my face is hot." |
| Scoring | Total scores range from 0 to 21; 5+ indicates mild anxiety, 10+ moderate (suggesting referral), 15+ severe (priority for treatment) | No specific cutoff; provides detailed data for treatment planning |
Research into measuring blood phobia: Mas et al. (2010)
A key study by Mas et al. (2010) focused on creating a tool to measure blood phobia symptoms, specifically for people who speak Spanish as their first language. This research aimed to develop a reliable inventory that could distinguish between those with the phobia and those without.
Method
- Participants included people diagnosed with blood phobia and a control group without the condition.
- They rated 50 items related to anxiety on four-point Likert-style scales (a scale where responses range from strongly disagree to strongly agree).
- Statistical analysis was used to remove items that did not effectively differentiate between the groups.
- Blood phobics also completed interviews and the Fear Questionnaire (FQ), a standard measure of various fears.
Results
- There was a strong positive correlation between scores on the new Blood Injection Phobia Inventory (BIPI) and the blood-related subsection of the FQ, showing they measured similar things.
- The blood phobic group scored much higher on the BIPI compared to the control group.
Conclusions
- The BIPI is a valid tool for assessing blood phobia symptoms in Spanish speakers, as it effectively identifies differences between affected individuals and others.
Evaluation
- Strengths - Quantitative data allowed for statistical analysis to refine the inventory by eliminating less useful items.
- Weaknesses - The blood phobic group had significantly more women than men, which might limit how well the BIPI applies to men, affecting generalisability.
Evaluating diagnosis and measurement of anxiety disorders
Evaluating the tools and methods for diagnosing and measuring anxiety disorders is important to ensure they are reliable and useful. This involves looking at strengths like accuracy and weaknesses like potential biases. For instance, reliability checks how consistent results are over time, while validity assesses if the tool measures what it claims to.
Evaluation of GAD-7
- Strengths:
- High test-retest reliability (consistency when retaken), with a correlation of +0.83 from Spitzer et al. (2006).
- Strong validity, as it correlates positively with other established anxiety measures.
- Weaknesses:
- Test-retest data was only collected a short period apart, which might not show long-term consistency.
- Uses a nomothetic approach (focusing on general patterns), which ignores individual contexts of anxiety.
Evaluation of BIPI
- Strengths:
- Good validity, as shown by Mas et al. (2010), with correlations to other fear measures.
- Practical applications, providing a wealth of data to help design personalised treatment plans.
- Weaknesses:
- Subjective nature, as it relies on self-reports of how people think they would respond, not direct observations of behaviour.
- Risk of response set (consistent answering patterns due to fatigue), as completing it is time-consuming.