Sunday, 17 June 2012

Anxiety Disorders | Definition, Symptoms, Treatment, Anxiety Attacks


Overview
Anxiety - Classification, Causes
Anxiolytics - Types, Mechanism of Actions
Benzodiazepines - Therapeutic use, Pharmacokinetics, Side effects, Overdose/withdrawal, Drug-drug interactions, Receptor activity
Barbiturates - Adverse effects
Others - Carbamates, Buspirone

Anxiety
Anxiety is a vague feelings of apprehension or fear when natural human experience to stress. Everyone experiences it in their life and it becomes a problem when it is in excess, irrational, uncontrollable, and disruptive.
Anxiety disorders are a group of psychiatric conditions that involve excessive anxiety.

Manifestations of Anxiety
Verbal complaints - The patients say he/she is anxious, nervous
Somatic and autonomic symptoms - The patient is restless and agitated, has tachycardia, increased sweating, disturbed sleep (insomnia), weeping and often gastrointestinal disorders
Social effects - Inteference with normal productive activities
Anxiety may be a single episode or chronic disorder

Classification of Anxiety
·         Types of Anxiety Disorders
·         Obsessive-Compulsive Disorder
·         Post-Traumatic Stress Disorderr
·         Generalized Anxiety Disorder
·         Panic Disorder
·         Phobias

Obsessive-Compulsive Disorder
Obsessions - irrational, disturbing thoughts that intrude into consciousness
Compulsions - repetitive behaviour or rituals performed to alleviate obsessions
Performance of these rituals neutralize the anxiety, however relief is only temporary
- Cleaning: repeatedly washing hands or cleaning home
- Checking: check several or even hundreds of times to make sure that stoves are turned off or doors are locked
- Repeating: some repeat a name, phrase or action over and over

Post-Traumatic Stress Disorder (PTSD)
PTSD is an anxiety triggered by recall of past stressful experiences or traumatic event such as war, natural disaster, serious accident, rape or assault
Symptoms may include:
-nightmares
-sense of event recurring or flashbacks
-avoidance behaviour in terms of activities, situations, people
-hypersensitivity: sleeplessness, anxious feeling, irritability, outbursts of anger

Generalized Anxiety Disorder
GAD is an ongoing state of excessive anxiety lacking any clear reason
It is a continual apprehension and anxiety about future events and the worry seriously interferes with functioning and daily routines
Physical symptoms may include headaches, stomachaches, muscle tension and irritability

Panic Disorder
Panic disorder is a sudden attacks of overwhelming fear occur in association with marked somatic symptoms
Symptoms may include:
-sweating
-palpitations
-chest pains
-breathlessness
-dizziness or lightheadness
-chills or hot flushes

Phobias
Phobias is a strong irrational fear of specific objects or situations. It is considered phobic if these fears interfere with normal behavior
Specific phobias - fear of specific object
-animals (eg. snakes)
-substances (eg. blood)
-situations (eg. height)
-it occurs more often in females than males

Social phobias - fear of failing or being judged in public
-public speaking (stage fright)
-fear of crowds, strangers
-meeting new people
-eating in public
-equally often in males and females
In extreme casesthis intense uneasiness can progress into a full blown panic attack

Pathophysiology
Pathophysiology of anxiety is unclear and may result from imbalances in neurotransmitters. It may be due to excess of norepinephrine or deficiency of inhibitory subtances such as gamma aminobutyric acid (GABA).
Serotonin also plays a role in anxiety but the mechanism is unclear.

Causes of Anxiety
Medical - respiratory, endocrine, cardiovascular, metabolic, neurologic
Drug-induced    - Stimulants (amphetamines, cocaine, caffeine)
                        - Sympathomimetics (ephedrine, epinephrine, pseudoephedrine)
                        - ANticholinergics / Antihistaminergics (trihexyphenidyl, benztropine, diphenhydramine)
                        - Dopaminergics (bromocriptine, L-Dopa)
Drugs Withdrawal - Benzodiazepines, narcotics, barbiturates, other sedatives, alcohol


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