Mood Disorders: Treatments and Psychological Therapies (Summary)

Electroconvulsive Therapy (ECT)

  • First-line meds are common, but ECT is used for severe, persistent mood disorders and treatment resistance.

  • History: introduced early 20th century; stigmatized in 1950s–1970s; resurged in the 1980s; now widely used in hospitals worldwide.

  • Typical procedure:

    • Seizure induced by passing current through the brain; anesthesia and muscle relaxants used.

    • Electrodes placed on the head; current of 70\text{ to }150\,\text{V} for about 0.5\text{ to }1\,\text{s}.

    • Seizure lasts about 1\,\text{minute}.

    • Full course: typically 6\text{ to }12\text{ sessions} .

  • ECT effectiveness:

    • Remission achieved in 50\% \text{ to } 80\% of clients; higher than antidepressants in some cases.

    • More likely to reduce symptoms than antidepressants for treatment-resistant depression.

    • Most effective as a first-line option in severe depression or during psychotic features; strong anti-suicidal effects.

  • Brain mechanism (still unclear):

    • May cause structural changes in mood-related regions: prefrontal cortex, hippocampus, angular gyrus, insula, among others.

    • Likely involves brain networks rather than a single area; may alter neurotransmitters (serotonin, dopamine), reduce inflammation, promote neuroplasticity and neurogenesis in regions like the hippocampus, basal ganglia, anterior cingulate, and prefrontal cortex.

    • Neurogenesis is promoted; ECT may rewire brain networks important for mood regulation.

  • Side effects & memory:

    • ECT can cause memory loss and learning difficulties, especially days after treatment.

    • Traditional bilateral ECT had greater cognitive effects; modern practice often uses unilateral ECT (usually right-sided) to reduce memory impairment, though bilateral ECT is still used when needed.

  • Relapse & maintenance:

    • Relapse can be high, up to 85\%; >30\% relapse within the first 6 months post-ECT.

    • Continuation/maintenance ECT can reduce relapse for some, but guidelines are not clear; gradual discontinuation may help reduce early relapse.

  • Access & perception:

    • Stigma and limited access in some regions impact perceived right to effective treatment.

Newer Methods of Brain Stimulation

  • Repetitive transcranial magnetic stimulation (rTMS)

    • Noninvasive, outpatient treatment using high-intensity magnetic pulses.

    • Target: left prefrontal cortex (often hypoactive in depression).

    • Few side effects; typically mild headaches; no anesthesia required.

    • Shown to improve depressive symptoms in treatment-resistant cases; promising alternative for those who cannot tolerate ECT.

  • Vagus nerve stimulation (VNS)

    • Invasive: electrodes implanted on the vagus nerve with a pulse generator under the skin (left chest wall).

    • Longitudinal data (≈5 years) show superior outcomes in effectiveness and mortality for chronic, severe, treatment-resistant depression, but coverage is limited by insurers.

  • Deep brain stimulation (DBS)

    • Electrodes implanted in specific brain regions; connected to an implanted pulse generator.

    • Small trials show promise for intractable depression; mechanism and optimal targets remain under study.

Light Therapy

  • applicable to Seasonal Affective Disorder (SAD), a winter-specifier of major depressive disorder.

  • SAD biology: may involve deficient retinal sensitivity to light and circadian rhythm disruption.

  • Efficacy:

    • Light therapy alone produced remission in 57\% of SAD patients in one trial.

    • Remission rose to 79\% when combined with cognitive therapy; control group remission was 23\%.

  • Mechanisms:

    • Resetting circadian rhythms; reducing melatonin production; increasing norepinephrine/serotonin; bright light may directly boost serotonin.

Psychological Treatments for Mood Disorders

  • Theoretical basis: behavioral, cognitive, and behavioral–cognitive approaches.

  • Goals across therapies: reduce negative thoughts, increase adaptive behaviors, and improve functioning.

  • Behavioral Therapy (short-term, ~12 weeks)

    • Focuses on increasing positive reinforcers and reducing aversive experiences.

    • Functional analysis to identify situations that worsen symptoms and to modify environmental interactions.

    • Teach relaxation and social/role skills; modify activities to increase pleasurable experiences and reduce isolation.

    • Case study highlight: client learned to schedule social/recreational activities and relaxation techniques; improved mood through increased control.

  • Cognitive-Behavioral Therapy (CBT)

    • Integrates cognitive and behavioral theories; two general goals:

    • Change negative, hopeless thinking patterns.

    • Solve real-life problems and increase effective reinforcers.

    • Structure: brief, time-limited (typically 6\text{ to }12\text{ weeks}) with client-set goals.

    • Process:

    • Identify negative automatic thoughts and link to mood.

    • Homework: track mood and thoughts (e.g., using thought records similar to Figure 7 in the text).

    • Case study highlight: Susan challenged beliefs about maternal criticism; learned to attribute criticism to her mother’s issues, not her own worth; gained greater emotional control.

Notes on Major Concepts

  • ECT remains a highly effective option for treatment-resistant depression and certain severe mood episodes, with rapid improvement in some cases.

  • Memory side effects are a consideration; unilateral ECT is used to minimize cognitive impact, though bilateral ECT may be more effective in some instances.

  • Newer brain stimulation methods (rTMS, VNS, DBS) offer alternatives with varying levels of invasiveness and evidence; ongoing research into mechanisms and optimal use.

  • Light therapy is a nonpharmacological option for SAD, with mechanisms linked to circadian biology and neurotransmitter regulation.

  • Psychological treatments (Behavioral Therapy, CBT) focus on altering behavior-environment interactions and cognitive processes to relieve depressive symptoms; often time-limited and goal-focused.

Key Formulas and Numbers

  • ECT current/duration: 70\le V \le 150, \quad \text{duration} = 0.5\text{ to }1\ \text{s}

  • Seizure duration: \approx 1\ \text{minute}

  • Treatment course: 6\text{ to }12\ \text{sessions}

  • Remission rates: 50\% \le \text{remission} \le 80\%

  • Relapse rates: up to 85\%; >30\% relapse in first 6 months

  • CBT/Behavioral therapy duration: typically 6\text{ to }12\ \text{weeks}