Psychiatric Flashcards
what is the common pharmacological action of antidepressants?
elevate levels of one or more monoamine neurotransmitters n the synaptic cleft
How do tricyclic antidepressants work?
E.g Amitriptyline
blockage of both noradrenaline and serotonin re-uptake pumps presynaptically
How do SSRI work?
E.g citalopram, Fluoxetine, Sertaline
selective presynaptic blockage of serotonin re-uptake pumps
How do SNRI work?
e.g Venlafaxine
presynaptic blockage of both serotonin and noradrenaline re-uptake pumps (with no affect on muscarinic, histaminergic or alpha-adrenergic receptors)
How do Monoamine oxidase inhibitors (MAOI) work?
E.g Phenelzine, Tranylcypromine, Isocarboxazid
non-selective and irreversible inhibits of monoamine oxidase A and B
How to Reversible inhibitor of Monoamine oxidase A work?
e.g moclobeminde
selective and reversible inhibition of monoamine oxidase A
Indications for SSRI’s?
Depression
Anxiety disorders
OCD
Bulimia Nervosa
What SSRI is used in Bulimia nervosa?
Fluoexetine
indications for TCA?
Depression Anxiety disordrs OCD Chronic pain nocturnal enuresis
indications for MAOI?
Depression
anxiety
Eating disorders
Parkinsons
S.E and contraindications of SSRI?
- Fewer anticholinergic affects than TCA and are not sedating
- Are alerting, so prescribe in morning
- Common SE= N&V, diarrhoea, pain, anxiety, agitation, weight loss and loss of appetite, insomnia, sweating sexual dysfunction
- CI= Mania
Tricyclic Antidepressants- SE and CI?
- SE- dry mouth, constipation, urinary retention and dizziness (anticholinergic effects)
- Postural hypotension (due to alpha-adrenergic)
- Weight gain and sedation (histaminergic)
- Cardiotoxic–> Prolonged QT, ST elevation, heart block, arrythmias
- CI= recent MI, arrhythmia, severe liver disease, mania
MAOI- SE and CI?
- Now is 2nd line due to many interactions with certain foods
High risk of Serotonin syndrome
S.E- Anticholinergic effects and postural hypertension
CI- Phaeochromoctyoma, CVD, hepatic impairment , Mania
What is serotonin syndrome?
neuromuscular abnormalities, altered conscious level, autonomic instability
Is fatal
Name the 2 types of Mood stabilisers?
1) Lithium
2) Anti-convulsants= sodium valproate, carbamazepine and lamotrigine
Indications for lithium?
- Acute mania
- Prophylaxis of bipolar affective disorder
- Treatment for resistant depression
Indications for sodium valporate?
- Epilepsy
- Acute mania
- Prophylaxis of Bipolar
indications for carbamazepine?
- epilepsy
- Prophylaxis of Bipolar
- Trigeminal neuralgia
Lithium range ?
- 0.5-1
Over 1.5 is toxic, and over 2 is dangerous
What drugs can increase lithium levels?
- Diuretics, NSAIDs and ACE-i (stopping renal clearance)
S.E of lithium?
- Thirst, polydipsia polyuria, weight gain, oedema
- Fine tremor
- Precipitation of skin problems
- Concentration/memory problems
- ECG changes= T wave flattening or inversion
- Hypothyroidism
- Leucocytosis
Signs of lithium toxicity?
- N&V, apathy, coarse tenor, ataxia, muscle weakness
- Dangerous levels= nystagmus, dysarthria, impaired consciousness, hyperactive tension reflexes, renal function and electrolyte imbalances
Things to do before prescribing lithium? (testing for CI)
- FBC
- Renal function and electrolytes
- Thyroid function
- Pregnancy test
- ECG
S.E of sodium valproate?
- Increased appetite and weight gain
- Sedation and dizziness
- Ankle swelling
- N&V
- Tremor
- Can cause haematological abnormalities and raised liver enzymes
S.E of carbamazepine?
- N&V
- skin rashes
- Blurred or double vision
- Ataxia, drowsiness and fatigue
- Hyponatraemia, haem abnormalities and raised liver enzymes
Name x2 1st generation antipsychotics?
- Chloropromazine
- Haloperidol
Name x4 2nd generation (atypical) antipsychotics?
- Clozapine
- Olanzapine
- Quetiapine
- Risperidone
Mode of action of anti-psychotics?
- Antagonism of dopamine D2 receptors in the mesolimbic dopamine pathway–> area associated with delusions, hallucinations, thought disorders etc. Also area where most illicit drugs work, thus euphoria etc…
What is different about Clozapines mode of action?
its a weak D2 antagonist, but a strong affinity for serotonin type 2 and D4
S.E of Clozapine?
- Rare serious side effects such as agranulocytosis, myocarditis and cardiomyopathy
- thus reserved for treatment resistant cases
(needs weekly FBC’s then montly)
what are the extrapyramidal S.E of anti-psychotics?
- parkinsonism motorsyptoms
- acute dystonia
- Akathisia
- Tardive dyskinesia
indications for antipsychotics?
- Schizophrenia, schizoaffective disorder, delusional disorder
- depression or mania with psychosis
- psychosis due to substance abuse
- delirium
Triad in Neuroepileptic malignant syndrome and Serotonin syndrome?
- neuromuscular abnormalities
- altered consciousness
- autonomic dysfunction
NMS vs Serotonin syndrome?
- NMS= caused by too much dopamine antagonist. Get reduced activity (rigidity, dysphagia etc)
- SS= too much serotonin (increased activity)
Blood results of NMS and SS?
elevated CK, WCC and hepatic transaminases
Also see a metabolic acidosis
Drugs used for Anxiety and lack of sleep?
- Benzodiazepines
Mode of action of benzo’s?
potentiate the action go GABA
indications for benzo’s?
- insomnia
- Anxiety disorders
- alcohol withdrawl
- akathisia
- acute mania or psychosis (sedation)
indication for Electroconvulsive therapy?
- severe depression (when life is threatened, poor fluids and feeding, suicidal intent etc)
S.E of ECT?
CI of ECT?
S.e= loss of memory. confusion, Nausea, headache and muscle pain CI= Heart disease, Raised ICP, risk of cerebral bleeding etc
What is a mental disorder?
any disorder or disability of the mind
What is the mental health act?
provides a legal framework for the care and treatment of individuals with mental disorders
What is a section 2?
Admission for assessment.
compulsory detention for assessment. used for when diagnosis and response to treatment are unknown. lasts for 28 days and requires 2 doctors (one doctor must be section 12 approved)