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Emergency And Acute Medicine – Depression
Basic Overview
Major depression is defined by a depressed mood with associated signs and symptoms lasting longer than two weeks. It is associated with significant morbidity and mortality, including a substantial risk of suicide, and frequently coexists with other medical illnesses.
Etiology And Risk Factors
Depression is a biologic illness associated with dysregulation of multiple neurotransmitter systems, including serotonin, norepinephrine, and dopamine. Contributing factors include genetic predisposition, medical illness, medication effects, and psychosocial stressors. Episodes may follow adverse life events, trauma, loss of important relationships, or changes in life roles. Depression is more prevalent in women, although men are more likely to die by suicide.
Clinical Features
Diagnosis requires five or more symptoms present for at least two weeks, with either depressed mood or loss of interest or pleasure being mandatory. Symptoms include depressed mood, diminished interest or pleasure, appetite or weight change, sleep disturbance, fatigue, impaired concentration, feelings of worthlessness or guilt, psychomotor agitation or retardation, and recurrent thoughts of death or suicide. Depression may present with anxious agitation or social withdrawal and is often accompanied by somatic complaints such as weakness, malaise, weight loss, headache, or back pain. Subtypes include psychotic, melancholic, catatonic, atypical, postpartum, and seasonal depression.
History And Examination
Assessment should include symptom time course, acuity, psychosocial stressors, past medical and psychiatric history, medication and substance use, family history, and social and occupational functioning. A focused safety assessment is essential, evaluating suicide risk, risk of harm to others, and ability to care for oneself. Collateral information from family or outpatient providers is often crucial. Physical examination includes vital signs, a focused neurologic exam, cognitive assessment, and a full mental status examination. Cultural and language barriers should be addressed with interpreters when needed.
Special Populations
In children and adolescents, depression may present as changes in school performance, sleep, social withdrawal, or somatic complaints, and diagnosis may be challenging. Bipolar disorder must be excluded, as treatment differs and antidepressants may precipitate mania.
Evaluation
Initial evaluation relies on history and physical examination, with attention to coexisting psychiatric disorders, substance use, and medical causes. Safety assessment is mandatory. First-line laboratory studies include CBC, basic chemistries, renal function, glucose, calcium, liver function tests, urinalysis, serum and urine toxicology screens, thyroid function tests, and vitamin B12 and folate levels. Additional tests, such as HIV testing, RPR, inflammatory markers, or autoimmune studies, are guided by clinical suspicion. Brain imaging is reserved for atypical presentations or focal neurologic findings, with MRI preferred over CT when available.
Differential Diagnosis
Psychiatric conditions include dysthymia, adjustment disorder, bipolar disorder, anxiety disorders, psychotic disorders, personality disorders, eating disorders, and substance-induced mood disorders. Medical conditions that may mimic or cause depression include endocrine disorders, neurologic diseases, infections, nutritional deficiencies, electrolyte disturbances, chronic organ failure, obstructive sleep apnea, chronic pain syndromes, and medication effects.
Emergency Management
Initial management focuses on patient and staff safety, assessment of suicide and violence risk, and identification of underlying medical contributors. One-to-one observation and suicide precautions are indicated when risk is high. Medical causes such as hypoglycemia, infection, electrolyte abnormalities, or intoxication should be treated promptly. Empathic listening, reassurance, and education that depression is treatable are essential components of care.
Pharmacologic Treatment
Antidepressant therapy may be initiated in selected patients with a clear diagnosis and reliable follow-up, recognizing that symptom improvement typically takes weeks. First-line agents include SSRIs, SNRIs, bupropion, and mirtazapine, chosen based on side-effect profile, comorbidities, cost, and patient factors. Tricyclic antidepressants and monoamine oxidase inhibitors are second-line options due to higher risk profiles and should be used cautiously. Low-dose benzodiazepines or antipsychotics may be used short term for agitation, insomnia, or psychosis. Elderly patients require lower starting doses and careful monitoring for orthostasis and drug interactions. In children and adolescents, antidepressants carry an FDA black box warning for increased suicidal ideation. In pregnancy and lactation, risks and benefits must be weighed carefully, ideally with specialist input. Electroconvulsive therapy may be considered for severe, psychotic, catatonic, or treatment-resistant depression.
Disposition
Admission is indicated for patients with suicidal ideation or high suicide risk, psychotic features, severe functional impairment, unreliable social support, or need for involuntary commitment. Patients with low suicide risk, adequate support, and reliable follow-up may be discharged.
Follow-Up And Referral
Outpatient mental health follow-up should be arranged, typically within one to two weeks for patients with significant symptoms or those started on medication. More stable patients may follow up less urgently. Coordination with primary care, psychiatry, and social services is often necessary.
Key Clinical Insights And Common Errors
Depression carries significant morbidity and risk of self-harm. Always assess suicide risk and consider medical and psychiatric conditions that can mimic or exacerbate depression. Awareness of local involuntary commitment criteria and careful coordination of follow-up care are essential to safe management.
Basic Overview
Major depression is defined by a depressed mood with associated signs and symptoms lasting longer than two weeks. It is associated with significant morbidity and mortality, including a substantial risk of suicide, and frequently coexists with other medical illnesses.
Etiology And Risk Factors
Depression is a biologic illness associated with dysregulation of multiple neurotransmitter systems, including serotonin, norepinephrine, and dopamine. Contributing factors include genetic predisposition, medical illness, medication effects, and psychosocial stressors. Episodes may follow adverse life events, trauma, loss of important relationships, or changes in life roles. Depression is more prevalent in women, although men are more likely to die by suicide.
Clinical Features
Diagnosis requires five or more symptoms present for at least two weeks, with either depressed mood or loss of interest or pleasure being mandatory. Symptoms include depressed mood, diminished interest or pleasure, appetite or weight change, sleep disturbance, fatigue, impaired concentration, feelings of worthlessness or guilt, psychomotor agitation or retardation, and recurrent thoughts of death or suicide. Depression may present with anxious agitation or social withdrawal and is often accompanied by somatic complaints such as weakness, malaise, weight loss, headache, or back pain. Subtypes include psychotic, melancholic, catatonic, atypical, postpartum, and seasonal depression.
History And Examination
Assessment should include symptom time course, acuity, psychosocial stressors, past medical and psychiatric history, medication and substance use, family history, and social and occupational functioning. A focused safety assessment is essential, evaluating suicide risk, risk of harm to others, and ability to care for oneself. Collateral information from family or outpatient providers is often crucial. Physical examination includes vital signs, a focused neurologic exam, cognitive assessment, and a full mental status examination. Cultural and language barriers should be addressed with interpreters when needed.
Special Populations
In children and adolescents, depression may present as changes in school performance, sleep, social withdrawal, or somatic complaints, and diagnosis may be challenging. Bipolar disorder must be excluded, as treatment differs and antidepressants may precipitate mania.
Evaluation
Initial evaluation relies on history and physical examination, with attention to coexisting psychiatric disorders, substance use, and medical causes. Safety assessment is mandatory. First-line laboratory studies include CBC, basic chemistries, renal function, glucose, calcium, liver function tests, urinalysis, serum and urine toxicology screens, thyroid function tests, and vitamin B12 and folate levels. Additional tests, such as HIV testing, RPR, inflammatory markers, or autoimmune studies, are guided by clinical suspicion. Brain imaging is reserved for atypical presentations or focal neurologic findings, with MRI preferred over CT when available.
Differential Diagnosis
Psychiatric conditions include dysthymia, adjustment disorder, bipolar disorder, anxiety disorders, psychotic disorders, personality disorders, eating disorders, and substance-induced mood disorders. Medical conditions that may mimic or cause depression include endocrine disorders, neurologic diseases, infections, nutritional deficiencies, electrolyte disturbances, chronic organ failure, obstructive sleep apnea, chronic pain syndromes, and medication effects.
Emergency Management
Initial management focuses on patient and staff safety, assessment of suicide and violence risk, and identification of underlying medical contributors. One-to-one observation and suicide precautions are indicated when risk is high. Medical causes such as hypoglycemia, infection, electrolyte abnormalities, or intoxication should be treated promptly. Empathic listening, reassurance, and education that depression is treatable are essential components of care.
Pharmacologic Treatment
Antidepressant therapy may be initiated in selected patients with a clear diagnosis and reliable follow-up, recognizing that symptom improvement typically takes weeks. First-line agents include SSRIs, SNRIs, bupropion, and mirtazapine, chosen based on side-effect profile, comorbidities, cost, and patient factors. Tricyclic antidepressants and monoamine oxidase inhibitors are second-line options due to higher risk profiles and should be used cautiously. Low-dose benzodiazepines or antipsychotics may be used short term for agitation, insomnia, or psychosis. Elderly patients require lower starting doses and careful monitoring for orthostasis and drug interactions. In children and adolescents, antidepressants carry an FDA black box warning for increased suicidal ideation. In pregnancy and lactation, risks and benefits must be weighed carefully, ideally with specialist input. Electroconvulsive therapy may be considered for severe, psychotic, catatonic, or treatment-resistant depression.
Disposition
Admission is indicated for patients with suicidal ideation or high suicide risk, psychotic features, severe functional impairment, unreliable social support, or need for involuntary commitment. Patients with low suicide risk, adequate support, and reliable follow-up may be discharged.
Follow-Up And Referral
Outpatient mental health follow-up should be arranged, typically within one to two weeks for patients with significant symptoms or those started on medication. More stable patients may follow up less urgently. Coordination with primary care, psychiatry, and social services is often necessary.
Key Clinical Insights And Common Errors
Depression carries significant morbidity and risk of self-harm. Always assess suicide risk and consider medical and psychiatric conditions that can mimic or exacerbate depression. Awareness of local involuntary commitment criteria and careful coordination of follow-up care are essential to safe management.
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