Impulse-control disorder (ICD) is a class of psychiatric disorders characterized by impulsivity - failure to resist a temptation, an urge, an impulse, or the inability to not speak on a thought. Many psychiatric disorders feature impulsivity, including substance-related disorders, behavioral addictions, attention deficit hyperactivity disorder, antisocial personality disorder, borderline personality disorder, conduct disorder and some mood disorders.
The fifth edition of the American Psychiatric Association's Diagnostic and statistical manual of mental disorders (DSM-5) that was published in 2013 includes a new chapter (not in DSM-IV-TR) on Disruptive, Impulse-Control, and Conduct Disorders covering disorders "characterized by problems in emotional and behavioral self-control".
Five behavioral stages characterize impulsivity: an impulse, growing tension, pleasure on acting, relief from the urge and finally guilt (which may or may not arise).
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Signs and symptoms
The signs and symptoms of impulse-control disorders vary based on the age of the persons suffering from them, the actual type of impulse-control that they are struggling with, the environment in which they are living, and whether they are male, female, or other.
Types
Disorders characterized by impulsivity that were not categorized elsewhere in the DSM-IV-TR were also included in the category "Impulse-control disorders not elsewhere classified". Trichotillomania (hair-pulling) and skin-picking were moved in DSM-5 to the obsessive-compulsive chapter. Additionally, other disorders not specifically listed in this category are often classed as impulsivity disorders. Terminology was changed in the DSM-V from "Not Otherwise Classified" to "Not Elsewhere Classified".
Sexual compulsion
Sexual compulsion includes an increased urge in sexual behavior and thoughts. This compulsion may also lead to several consequences in the individual's life, including risky partner selection, increased chance for STD and depression. There has not yet been a determined estimate of its prevalence due to the secretiveness of the disorder. However, research conducted in early 1990's in the United States gave prevalence estimates between 5%-6% in the U.S. population, with male cases being higher than female.
Internet addiction
The disorder of Internet addiction has only recently been taken into consideration and has been added as a form of ICD. It is characterized by excessive and damaging usage of Internet with increased amount of time spent chatting, web-surfing, gambling, shopping or exploring pornographic web-sites. Excessive and problematic Internet use has been reported across all age, social, economical, and educational ranges. Although initially thought to occur mostly in males, increasing rates have been also observed in females. However, no epidemiological study has been conducted yet to understand its prevalence.
Compulsive shopping
Compulsive shopping or buying is characterized by a frequent irresistible urge to shop even if the purchases are not needed or cannot be afforded. The prevalence of compulsive buying in the U.S. has been estimated to be 2-8% of the general adult population, with 80-95% of these cases being females. The onset is believed to occur in late teens or early twenties and the disorder is considered to be generally chronic.
Pyromania
Pyromania is characterized by impulsive and repetitive urges to deliberately start fires. Because of its nature, the number of studies performed for fire-setting are understandably very few. However studies done on children and adolescents suffering from pyromania have reported its prevalence to be between 2.4%-3.5% in the United States. It has also been observed that the incidence of fire-setting is more common in juvenile and teenage boys than girls of the same age.
Intermittent explosive disorder
Intermittent explosive disorder or IED is a clinical condition of experiencing recurrent aggressive episodes that are out of proportion of any given stressor. Earlier studies reported a prevalence rate between 1%-2% in a clinical setting, however a study done by Coccaro and colleagues in 2004 had reported about 11.1% lifetime prevalence and 3.2% one month prevalence in a sample of a moderate number of individuals (n=253). Based on the study, Coccaro and colleagues estimated the prevalence of IED in 1.4 million individuals in the US and 10 million with lifetime IED.
Kleptomania
Kleptomania is characterized by an impulsive urge to steal purely for the sake of gratification. In the U.S. the presence of kleptomania is unknown but has been estimated at 6 per 1000 individuals. Kleptomania is also thought to be the cause of 5% of annual shoplifting in the U.S. If true, 100,000 arrests are made in the U.S. annually due to kleptomaniac behavior.
Mechanism
Dysfunction of the striatum may prove to be the link between OCD, ICD and SUD. According to research, the 'impulsiveness' that occurs in the later stages of OCD is caused by progressive dysfunction of the ventral striatal circuit. Whereas in case of ICD and SUD, the increased dysfunction of dorsal striatal circuit increases the "ICD and SUD behaviours that are driven by the compulsive processes". OCD and ICD have traditionally been viewed as two very different disorders, the former one is generally driven by the desire to avoid harm whereas the later one driven "by reward-seeking behaviour". Still there are certain behaviours similar in both, for example the compulsiveness of skin pickings in ICD patients and the behaviour of reward-seeking (for example hoarding) in OCD patients.
Treatment
Impulse-control disorders have two treatment options: psychosocial and pharmacological. Treatment methodology is informed by the presence of comorbid conditions.
Medication
In the case of pathological gambling, along with fluvoxamine, clomipramine has been shown effective in the treatment, with reducing the problems of pathological gambling in a subject by up to 90%. Whereas in trichotillomania, the use of clomipramine has again been found to be effective, fluoxetine has not produced consistent positive results. Fluoxetine, however, has produced positive results in the treatment of pathological skin picking disorder, although more research is needed to conclude this information. Fluoxetine has also been evaluated in treating IED and demonstrated significant improvement in reducing frequency and severity of impulsive aggression and irritability in a sample of 100 subjects who were randomized into a 14-week, double-blind study. Despite a large decrease in impulsive aggression behavior from baseline, only 44% of fluoxetine responders and 29% of all fluoxetine subjects were considered to be in full remission at the end of the study. Paroxetine has shown to be somewhat effective although the results are inconsistent. Another medication, escitalopram, has shown to improve the condition of the subjects of pathological gambling with anxiety symptoms. The results suggest that although SSRIs have shown positive results in the treatment of pathological gambling, inconsistent results with the use of SSRIs have been obtained which might suggest a neurological heterogeneity in the impulse-control disorder spectrum.
The psychosocial approach to the treatment of ICDs includes cognitive behavioral therapy (CBT) which has been reported to have positive results in the case of treatment of pathological gambling and sexual addiction. There is general consensus that cognitive-behavioural therapies offer an effective intervention model.
Co-morbidity
Complications of late Parkinson's disease may include a range of impulse-control disorders, including eating, buying, compulsive gambling and sexual behavior. One study found that 13.6% of Parkinson's patients exhibited at least one form of ICD. There is a significant co-occurrence of pathological gambling and personality disorder, and is suggested to be caused partly by their common "genetic vulnerability". The degree of heritability to ICD is similar to other psychiatric disorders including substance abuse disorder. There has also been found a genetic factor to the development of ICD just as there is for substance abuse disorder. The risk for subclinical PG in a population is accounted for by the risk of alcohol dependence by about 12-20% genetic and 3-8% environmental factors. There is a high rate of comorbidity between ADHD and other impulse-control disorders.
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