5.5 Generalized Anxiety Disorder (GAD) – Comprehensive Notes

Criterion A – Core Feature
- Excessive anxiety & worry ("apprehensive expectation") occurring more days than not for $\ge 6\ \text{months}$ .
- Worry involves multiple events / activities (e.g., work, school performance); not restricted to a single domain.
Criterion B – Lack of Control
- Individual finds it difficult to control the worry once it starts.
Criterion C – Somatic/Cognitive Symptom Cluster
- $\text{Adults:}\ \ge 3$ of 6 symptoms; $\text{Children:}\ \ge 1$ symptom.
1. Restlessness / feeling keyed-up / on edge
2. Being easily fatigued
3. Difficulty concentrating / mind going blank
4. Irritability
5. Muscle tension
6. Sleep disturbance (difficulty falling or staying asleep; restless, unsatisfying sleep)
Criterion D – Functional Impairment
- Anxiety, worry, or physical symptoms cause clinically significant distress or impairment in social, occupational, or other important areas.
Criterion E – Rule-Out: Substance / Medical Condition
- Not attributable to drugs, medications, or another medical condition (e.g., \hyperthyroidism).
Criterion F – Rule-Out: Other Mental Disorders
- Worry not better explained by: panic disorder (panic attacks), social anxiety disorder (negative evaluation), OCD (contamination), separation anxiety, PTSD (trauma reminders), anorexia nervosa (weight gain), somatic-symptom disorder, body-dysmorphic disorder, illness-anxiety disorder, schizophrenia spectrum delusions, etc.

Several criteria (fatigue, sleep problems, concentration issues) overlap with major depressive episodes.
Muscle tension & GI complaints are common presenting issues in primary-care offices.

Persistence: GAD worry is chronic & pervasive — present "most of the day, every day."
- Contrast: panic disorder = discrete attacks; phobias = episodic via situational triggers.
Breadth of Content: 100 % of GAD patients worry about minor or routine matters vs ≈ 50 % in other anxiety disorders.
Time Allocation: People with GAD spend a larger percentage of the day worrying and cover a wider range (family, money, friends, health).

Annual prevalence (U.S.): $3.1\%$ .
Lifetime prevalence: $5.7\%$ .
Sex ratio: ≈ 2 : 1 (women > men).
Age trends: Onset often in childhood/adolescence, peaks in middle age, and declines after $\approx 50$ years.
Similar prevalence to major depressive disorder (MDD); one of the most common mental illnesses.

Chronicity: 12-year follow-up — $42\%$ remained symptomatic $13$ years later.
Relapse: Of those who remitted, ≈ 50 % relapsed.
Symptom Shift in Later Life: Psychological worry may give way to somatic complaints ("somaticizing").
Comorbidity with MDD: GAD typically precedes MDD by ≈ 7 years; "fight-or-flight burnout" may transition into depressive shutdown.

Most patients remain functionally active but at high cost in effort & quality of life.
Lower rates of specialty mental-health visits than phobic or depressive disorders.
Frequent users of primary-care and emergency services for muscle, GI, or cardiac complaints; pattern mirrors panic disorder.

60–80 % report feeling anxious for as long as they can remember (trait-like).
Others show gradual escalation over years.
Can first emerge in older adulthood; among seniors it is the most common anxiety disorder.

Other anxiety disorders: panic disorder, social anxiety disorder, specific phobias, PTSD.
Mood disorders: major depressive disorder (extensive overlap).
High trait neuroticism acts as transdiagnostic vulnerability.

Perceptions of Uncontrollability & Unpredictability
- Repeated exposure to events perceived as uncontrollable (e.g., volatile boss) → chronic anxiety.
- GAD clients show low tolerance for uncertainty; higher intolerance → worse symptoms; parallels seen in OCD.
Sense of Mastery (or Lack Thereof)
- Rhesus-monkey study: infants given environmental control for $7!–!10$ months showed better adaptation to stressors.
- In humans, responsive parenting fosters mastery; intrusive, over-controlling parenting undermines it and promotes anxiety.
Reinforcement of Worry — Why keep worrying?
- "Superstitious avoidance": "If I worry, catastrophe won’t happen."
- Cognitive distraction: focusing on many small worries avoids deeper, more emotional topics.
- Preparation/Coping: mental rehearsal of worst-case scenarios feels like planning («watching true-crime to learn what not to do»).
- Physiological data: worry suppresses emotional & autonomic arousal, preventing full exposure → no extinction, so threat meaning persists (vicious cycle).

Genetics
- Family & twin studies: heritability ≈ $30\%$ .
- Shared genetic liability with MDD; environment (non-shared) guides which disorder manifests.
- Trait neuroticism is central shared substrate.
Neurotransmitters & Circuits
- GABA deficiency hypothesis: benzodiazepines (e.g., Xanax, Klonopin) relieve anxiety by enhancing GABA in limbic regions and lowering cortisol.
- Serotonin (and possibly norepinephrine) also implicated; exact interplay still under study.

Cognitive-Behavioral Therapy (CBT)
- Targets information-processing biases & catastrophizing; increases problem-solving, exposure to uncertainty, and relaxation skills.
- Has reduced dropout and helps patients taper long-term benzodiazepine use.
Pharmacotherapy
1. Benzodiazepines
- Rapid relief of somatic tension; minimal effect on cognitive worry.
- Risks: sedation, psychomotor impairment, physiological & psychological dependence, difficult withdrawal.
1. Buspirone
- Non-benzodiazepine anxiolytic; no sedation or dependence; greater impact on psychic symptoms.
- Onset of action $\approx 2!–!4\ \text{weeks}$ .
1. Antidepressants (SSRIs, SNRIs, MAOIs, etc.)
- Effective for both somatic & cognitive symptoms; overlap with MDD treatment.
- Require several weeks for full effect.

Chidi Anagonye ("The Good Place") personifies GAD: paralysis in decision-making, cascade from "concerns" → "outright fears," chronic pervasive worry.

Anxiety & mood disorders share neurochemical targets (GABA, serotonin, NE) and behavioral features (catastrophizing, avoidance).
Early anxiety may predict later mood disorders; monitoring continuum is clinically valuable.
Neuroticism contributes to higher healthcare costs (frequent visits, tests) — illustrates economic impact of trait anxiety.

$6\ \text{months}$ minimum duration for Criterion A.
$\ge 3$ of 6 symptoms for adults; $\ge 1$ for children.
Prevalence: annual $3.1\%$ ; lifetime $5.7\%$ .
Heritability $\approx 30\%$ .
42\% chronic at 13-year follow-up; \tfrac{1}{2} relapse after remission.
Women : men ≈ 2 : 1.

Link each DSM criterion to a mnemonic or patient vignette (e.g., "R-FISC" for Restless, Fatigued, Irritable, Sleep, Concentration) to enhance retention.