Mental Health Flashcards
what are the two groups of antipsychotics and their MOA?
- Typical or 1st generation antipsychotics
- MOA = D2 receptor Antagonist - Atypical or 2nd generation
- D2 and 5HT receptor antagonists.
- often have alpha adrenergic and histaminergic activity
What are examples of typical antipsychotics?
- haloperidol
- chlorpromazine
- fluphenazine
What are examples of atypical antipsychotics?
- Clozapine
- Olanzapine
- risperidone
- quetiapine
- aripiprazole
- paliperidone
what are the 6 main side effects of antipsychotics?
- EPSEs
- Hyperprolactinaemia
- metabolic effects
- prolonged QT
- anticholinergic effects
- narcoleptic malignant syndrome
which class of antipsychotics are EPSEs more common with?
- first gen typicals
- why do EPSEs occur?
Inhibition if the nigrostriatal pathway by dopaminergic antagonists
What are the 4 key presentations of EPSEs? (ADAPT)
- Acute dystonia
- muscle spasms and stiffness causing torticollis, grimacing, tongue protrusion
- Akathisia
- restlessness, inability to sit still
- Parkinsonism
- cogwhell rigidity, pill rolling tremour, bradykinesia, shuffling gait
- Tardive dyskinesia
- involuntary movements of mouth, tongue, limbs and face associated with chronic antipsychotic use
What side effects are more common in First generation APs?
- EPSEs
- Hyperprolactinaemia
- Anticholinergic effects
what side effects are more common in second generation APs?
- metabolic side effects
- weight gain
- hyperglycaemia
- dyslipidaemia
- particularly in clozapine, olanzapine, quetiapine
What adverse effects happen in any AP?
- Prolonged QT
2. narcoleptic malignancy syndrome
What causes elevated prolactin levels
due to dopamine blockade in the tuberinfundibular pathway that normally inhibits release
- what are they signs and symptoms of elevated prolactin levels?
- Males
- gynaecomastia
- galactorrhoea
- erectile dysfunction
- females
- galactorrhoea
- oligomennorhea
- reduced libido
what are the three top APs that cause QT prolongation?
- haloperidol
- iloperidone
- ziprasidone
What are anicholinergic effects of APs?
- dry mouth
- constipation
- urinary retention
- tachycardia
- blurred vision
- mydriasis
what are the 2 main indications for clozapine?
- treatment resistant schizophrenia with persistent symptoms despite optimal therapy with two different APs for at least 6 weeks each
- in patients who develop Tardive dyskinesia
what are the 4 components of the workup for clozapine?
- Thorough history and exam
- CVD, epilepsy, previous drug induced neutropenia
- bloods
- FBC ( specifically WCC and neutrophils)
- CRP
- UEC
- LFTs
- lipids
- BGL
- Troponin
- ECG and echocardiogram
- biometric data
- Height, weight, temp, BP, HR
how often should you be doing bloods once initiating someone on clozapine?
- weekly bloods for the first 18 weeks
2. then monthly after that.
what are the 3 specific side effects of clozapine that need to be monitored?
- Neutropenia and agranulocytosis
- myocarditis
- cardiomyopathy
how often and what tests to order to monitor for myocarditis once starting someone on clozapine?
- ECG
- crp
- troponins
- weekly for first month
- then whenever patient is febrile
when and how do you monitor for cardiomyopathy in a patient on clozapine?
- Echocardiogram
- annually
what does the choice of antidepressant depend on?
- shared decision making process with patient and clinician
- adverse effects in terms of tolerability and comorbidity
- safety to use with other medications
- disease factors
What are the four main groups of antidepressants?
- SSRIs
- SNRIs
- TCAs
- MAOIs
What is the MOA of TCAs?
- inhibits serotonin and Noradrenaline reuptake in the synaptic cleft to increase levels of both
- they also block cholinergic, histaminergic, alpha1-adrenergic and serotonergic receptors
What is the MOA of MAOIs?
- inhibit monoamine oxidase to prevent degredation of NA, serotonin and dopamine
Three examples of SSRIs and generic name?
- Citalopram → celapram
- escitalopram → lexapro
- Fluoxetine → prozac, lovan
- Sertaline → zoloft
- Paroxetine
what are 2 examples of SNRIs and generic name?
- Venlafaxine → efexor
2. Duloxetine
what are 3 examples of TCAs and generic name?
- Amitriptyline → endep
- doxepin → deptran
- mirtazapine (tertaCA) → mirtanza
what are 2 examples of MAOIs and generic name?
- Phenelzine
2. selegiline → for parkinsons
4 side effects of SSRIs?
- sexual dysfunction
- anticholinergic effects
- GI upset
- sedation
5 side effects of SNRIs?
- sexual dysfunction
- hypertension
- anticholinergic effects
- GI upset
- Sedation
4 side effects of TCAs
- anticholinergic effects
- QTc prolongation
- Weight gain
- Sedation
3 side effects of MAOIs
- Orthostatic hypotension
- CNS stimulation → headache, drowziness, fatigue, tremours, hyperreflexia etc
- Hypertensive crisis
What are 4 examples of mood stabilisers ?
- lithium
- carbamazepine
- valproate
- lamotrigine
What is the MOA of valproate?
- originally an antiepileptic
- blocks voltage and use depended Na+ channels
- enhances GABA
- inhibits Glutamate and t-type Ca+ channels
MOA of carbamazepine?
prevent repetitive neuronal discharges by blocking voltage dependent and use dependent Na+ channels
MOA of lamotrigine?
- for prevention of depressive episodes
- blocks voltage and use dependent Na channels
- inhibits glutamate release
what is the therapeutic range of lithium for acute mania?
0.5-1.2mmol/L
what is the therapeutic range of lithium for bipolar prophylaxis?
0.4-1.0mmol/L
how often should lithium levels be measured?
- after initiation
- after dose changes
- at least 2-4 times per year
At what level can lithium become toxic?
above 1.5mmol/L
- Overall, what are the clinical features of lithium toxicity? (VANISH LITTHHH)
- Vertigo
- Ataxia
- Nystagmus
- Intention tremour
- Stupor
- Hyperreflexia
- Leukocytosis
- Insipidus diabetes
- T wave inversion
- (Q) T prolongation
- hypothyroidism
- hyperparathyroidism
- heaviness (weight gain
what is the approach to treating lithium toxicity?
- Discontinuation
- IV fluid replacement → dehydration and hypotension common → 0.9% NS
- Haemodialysis for elimination in severe poisioning
- whole bowel irrigation for ingestions >50g within 4 hours of ingestion time
3 classes of drugs for anxiety?
- Antidepressants → SSRIs
- Benzodiazepines
- Beta-blockers → for SNS symptoms
What is the MOA of benzodiazepines and what 4 main effects does this have on the body?
- Sedation
- hypnosis
- anxiolysis
- muscle relaxation and anticonvulsant
what are 2 examples of benzos used in the short term to treat anxiety?
- diazepam
2. lorazepam
what are 4 examples of antidepressants that can be used to treat GAD?
- citalopram
- escitalopram
- fluoxetine
- duloxetine
what are 6 indications for use of benzos?
- anxiety
- sedation or anaesthesia
- status epilepticus
- alcohol withdrawal
- catatonia
- sleep onset and maintenance
what are short term effects of benzos?
- drowsiness
- fatigue
- muscle weakness
- headache
- slurred speech
- nystagmus
- amnesia
- ataxia
- paradoxical euphoria
what are long term side effects of benzos?
- sleep effects
- emotional blunting
- menstrual irregularities
what other drugs do benzos potentiate the effects of?
opioids and alcohol
What are 5 classes of serotinergic drugs and examples for each class?
- Decrease reuptake
- SSRIs, SNRIs, TCAs,
- Opioids (tramadol or pethidine)
- St john’s wart
- Decrease metabolism
- MAOIs
- increase release → illicits
- Opioids
- amphetamines
- MDMA
- Cocaine
- increase synthesis
- L-tryptophan
- Receptor agonists
- LSD
- Lithium
what is the clinical triad of serotonin syndrome?
- Neuromuscular excitation
- hyperreflexia, clonus, myoclonus, shivering, tremor, hypertonis, rigidity
- autonomic dysfunction
- hyperthermia, sweating, flushing, mydriasis, tachycardia
- CNS effects
- agitation, anxiety, confusion, altered consciousness
describe the Hunter serotonin Toxicity Criteria
- Spontaneous Clonus
- inducible clonus + agitation/sweating
- tremor and hyperreflexia
- hypertonia + temperature > 38 + inducible clonus
What is the management for SS?
- immediate cessation of serotonergic drugs
- supportive care
- moderate cases require sedation with benzos
- severe cases need:
- sedation
- rapid cooling techniques → cool IV fluids
- Fluid resus
- intubation/ventilation
What is the classic tetrad of neuroleptic malignancy syndrome?
- EPSE
- lead pipe ridigity, bradykinesisa, dystonia, dysphagia, abnormal posture, tremour
- Temperature dysregulation leading to hyperthermia >39
- autonomic effects
- tachycardia, labile BP, sweating, tachypnoea
- CNS effects
- confusion, coma
what are the major criteria for NMS?
Must have all three
- exposure to dopamine antagonist drug
- severe muscle rigidity
- hyperthermia
What are Minor criteria for NMS? – at least two must be present
- tachycardia, hypertension, labile BP, sweating
- raised serum CK, leukocytosis
- dysphagia, tremour
- altered consciousness, mutism, incontinence
what is the definition of MDD?
at least 5 symptoms from the DSM for at least 2 weeks
what is subthreshold depression?
patient with only 3-4 symptoms for a period of at least 2 weeks
persistent depressive disorder
- aka dysthymia
- at least 2 years of major depressive syndrome or subthreshold depression