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Substance misuse (Risk factors (Psychological disorder, Stressful events
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Substance misuse
Risk factors
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Stressful events
(abuse, loss of family member,
deprivation, neglect)
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Pathophysiology
Problematic use
Increasingly regular use, no dependence/addiction
Dependence
Social use can lead to regular use then compulsive
Strong, uncontrollable desire to take
Social use
Occasional, with peers, no dependence/addiction
Addiction
Positive reinforcement, tolerance, withdrawal, craving
due to neuroadaptive mechanisms
Diagnosis
Strong, uncontrollable desire to take substance;
3+ symptoms must be present
Examination
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General
Red eyes, dilated/pinpoint pupils
Track marks, skin abscesses
Tremor, confusion
History
Typical symptoms/signs e.g. psychosis
Admit illicit use, repeat drug requests
Criminal activity e.g. drug theft
Investigations
Bloods
FBC, U+E, LFTs
Blood cultures if needed
Toxicology screen
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Clinical
presentation
Dependence
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Difficulty controlling use
Onset, termination, amount
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