Psychiatry Flashcards
major risk factors for suicide
psychiatric disorders feelings of hopelessness or worthlessness impulsivity increasing age male sex access to weapons history of suicide attempts
neurotransmitters decreased in depression
serotonin, norepinephrine, dopamine
medical illnesses that can cause depressive symptoms
hypothyroidism hyperparathyroidism Parkinson disease stroke HIV Cancer (esp CNS neoplasms, which can mimic depression)
Drugs known to cause depressive symptoms
sedatives (alcohol, benzodiazepines, antihistamines)
withdrawal from stimulants (cocaine, amphetamines)
some antihypertensives (methyldopa, clonidine, beta- blockers)
first- generation antipsychotics (haloperidol)
prochlorperazine
metoclopramide
long-term glucocorticoid use
interferon- alpha (contraindicated in depression)
MDD with atypical features
mood reactivity increase appetite and weight gain hypersomnia leaden paralysis hypersensitivity to rejection responds well to MAOIs
MDD with seasonal pattern
recurrent depression exhibiting a regular temporal or seasonal pattern
treatment: light therapy (10,000 lux at least 30 min/day)
MDD with peripartum onset
onset during pregnancy or up to 4 weeks postpartum
MDD with psychotic features
delusions or hallucinations develop during an episode of MDD
No psychosis except during depressive episodes (the depression is always present even when the psychosis isn’t_
Schizoaffective disorder
baseline psychosis
mood disorder secondary to psychosis
persistent depressive disorder (formerly known as dysthymic disorder)
chronic, persistent depression for at least 2 YEARS (MDD no longer precludes persistent depressive disorder as it used to in DSM4)
depressed mood plus 2 SIGECAPS symptoms
more difficult to treat than MDD
SSRIs
citalopram, escitalopram, fluoxetine, fluvoxamine, paroxetine, sertraline
first line for depression as well as anxiety
work in 3-4 weeks
SNRIs
desvenlafaxine, duloxetine, milnacipran (fibromyalgia only), venlafaxine
Atypical antidepressants
buproprion, mitrazapine, nefazodone, trazodone
TCAs
amitriptyline, doxepin, imipramine, nortriptyline
MAOIs
phenelzine, tranylcypromine
side effects of SSRIs
sexual dysfunction insomnia/agitation weight gain risk of suicidal ideation risk of serotonin syndrome
Serotonin syndrome
mental status changes: anxiety, agitation, delirium, restlessness, disorientation
autonomic excitation: diaphoresis, tachycardia, hyperthermia, hypertension, vomiting, diarrhea
Neuromuscular hyperactivity: tremor, muscle rigidity, hyperreflexia, myoclonus
ocular clonus (slow, continuous, horizontal eye movements)
spontaneous or inducible clonus
positive Babinski sign bilaterally
Which drugs increase the risk of serotonin syndrome
SSRIs SNRIs MAOIs TCAs St. John's wort Tryptophan Triptans Linezolid Levodopa Stimulants (cocaine, ecstasy- MDMA, amphetamines)
How do we treat serotonin syndrome?
discontinue all serotonergic agents and symptoms usually resolve in 24 hours
Supportive care to normalize vital signs
- oxygen, IV fluids, cardiac monitoring
- if medical treatment for tachycardia or HTN is needed, use short- acting agents (esmolol, nitroprusside)
Sedation with benzodiazepines
If T>41, sedation, paralysis, ET tube- mechanical cooling
- paralysis should relieve the hyperthermia, which is caused by muscle activity
- there is no benefit in using antipyretics in this scenario
If agitation despite benzodiazepine then use a serotonin inhibitor like cyproheptadine
Adter sx resolve, assess need to resume serotonergic agent
side effects of SNRIs
sexual dysfunction insomnia/agitation nausea dizziness hypertension (venlafaxine) risk of serotonin syndrome
norepinephrine dopamine reuptake inhibitor (NDRI)
buproprion
blocks presynaptic reuptake of NE and DA
use this to treat fatigue and hypersomnia, but not anxiety
also indicated for smokine cessation
NDRI (buproprion) side effects
blocks pre-synaptic re-uptake of DA
insomnia, weight loss, lowers seizure threshold, contraindicated in anorexia, eating disorder, seizure disorder
no sexual dysfunction!
Alpha2 antagonist- mirtazapine
blocks alpha 2- adrenergic receptors, which leads to increased NE release
side effects include sedation for unknown reasons, appetite stimulation, and weight gain
useful in cancer patients who have comorbid depression
Serotonin modulators: trazadone, nefazodone, vilazodone
these drugs have a variety of effects on serotonin receptors (agonist/antagonist depending on the receptor subtype)
The main side effect is sedation
Trazedone can even be used as a sleep aid
priapism