Philosophy:Endogenous depression

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Endogenous depression (melancholia) is an atypical sub-class of the mood disorder, major depressive disorder (clinical depression). It could be caused by genetic and biological factors.[1] Endogenous depression occurs due to the presence of an internal (cognitive, biological) stressor instead of an external (social, environmental) stressor.[2] Endogenous depression includes patients with treatment-resistant, non-psychotic, major depressive disorder, characterized by abnormal behavior of the endogenous opioid system but not the monoaminergic system.[3][4][5][6] Symptoms vary in severity, type, and frequency and can be attributed to cognitive, social, biological, or environmental factors that result in persistent feelings of sadness and distress. Since symptoms are due to a biological phenomenon, prevalence rates tend to be higher in older adults.[7] Due to this fact, biological-focused treatment plans are often used in therapy to ensure the best prognosis.[2] Endogenous depression was part of the Kraepelinian dichotomy system.

Signs and symptoms

The forefront indication that a depressive episode is manifesting is the sudden loss of energy or motivation in daily routines.[8][9] When this occurs, it is not uncommon for individuals to seek medical attention with excessive worrying or anxiety that a more severe, physiological disease may be the underlying issue.[8] However, without an actual disease present, this neurotic thinking often results in severe anxiety, sleep disturbance, and mood swings which may hinder social relationships. Individuals with endogenous depression may experience inconsistencies in symptom severity [10] which is often the reason for delayed treatment.[8] If left untreated, symptoms may progress to a major depressive episode.

Risk factors

Endogenous depression occurs as the results of an internal stressor—commonly cognitive or biological—and not an external factor. Potential risk factors include these cognitive or biological factors. Patients with endogenous depression often are more likely to have a positive family history of disorders and fewer psychosocial and environmental factors that cause their symptoms.[11] A family history of depression and perceived poor intimate relationships are internal risk factors associated with this type of depression.[12] It is important to know these risk factors in order to take steps to recognize and help prevent this illness.

Treatment

The prevailing hypothesis is that endogenous depression, as opposed to other forms of major depressive disorder, has a biological rather than psychological cause. This leads clinicians to generally favour biological treatments, such as antidepressant and mood-stabilising medication and electroconvulsive therapy (ECT).[13] ECT is a safe and particularly effective treatment option for endogenous depression in adults and adolescents.[14] Both medication and ECT can be used in the short term to treat acute episodes of endogenous depression and in the longer term to lessen the risk of relapse or recurrence.

Prevalence

This type of depression often occurs due to biological reasons. Since symptoms are due to an internal phenomena, prevalence rates tend to be higher in older adults and more prevalent among women.[7] Although endogenous depression has been associated with increased age, there have been few attempts to evaluate this fully. More research is needed to indicate factual prevalence rates on this type of depression in society.

History

Endogenous depression was initially considered valuable as a means of diagnostic differentiation with reactive depression. While the latter's onset could be attributed to adverse life events and treated with talk therapy, the former would indicate treatment with antidepressants.[15] Indeed, this view of endogenous depression is at the root of the popular view that mood disorders are a reflection of a 'chemical imbalance' in the brain. More recent research has shown that the probability of an endogenous depression patient experiencing an adverse life event prior to a depressive episode is roughly the same as for a reactive depression patient and the efficacy of antidepressant therapy bears no statistical correlation with the patient's diagnostic classification along this axis.[16]

See also

References

  1. ↑ Matsunami, Katsufumi (2013). "The clinical meaning and academic significance of "endogenous depression" as an ideal type". Seishin Shinkeigaku Zasshi = Psychiatria et Neurologia Japonica 115 (3): 267–276. ISSN 0033-2658. PMID 23691813. 
  2. ↑ 2.0 2.1 Kramer, Thomas (2002). "Endogenous Versus Exogenous: Still Not the Issue". http://www.medscape.com/viewarticle/418269. 
  3. ↑ "Does the antidepressive response to opiate treatment describe a subtype of depression?". European Neuropsychopharmacology 16 (S4): S309. 2006. doi:10.1016/S0924-977X(06)70328-5. 
  4. ↑ Bodkin, JA; Zornberg, GL; Lukas, SE; Cole, JO (February 1995). "Harvard Medical School Clinical Study "Buprenorphine treatment of refractory depression."". Journal of Clinical Psychopharmacology 15 (1): 49–57. doi:10.1097/00004714-199502000-00008. PMID 7714228. 
  5. ↑ Nyhuis, P.W.; Specka, M.; Gastpar, M. (2006). "P.2.b.014 Does the antidepressive response to opiate treatment describe a subtype of depression?". European Neuropsychopharmacology 16: S309. doi:10.1016/s0924-977x(06)70328-5. 
  6. ↑ Bodkin, J. Alexander; Zornberg, Gwen L.; Lukas, Scott E.; Cole, Jonathan O. (February 1995). "Buprenorphine Treatment of Refractory Depression". Journal of Clinical Psychopharmacology 15 (1): 49–57. doi:10.1097/00004714-199502000-00008. PMID 7714228. 
  7. ↑ 7.0 7.1 Watts, C. A. H. (1956-06-16). "The Incidence and Prognosis of Endogenous Depression". British Medical Journal 1 (4980): 1392–1397. doi:10.1136/bmj.1.4980.1392. ISSN 0007-1447. PMID 13316166. 
  8. ↑ 8.0 8.1 8.2 Watts, C.A.H. (April 1968). "The Evolution of Depressive Symptoms in Endogenous Depression". The Journal of the Royal College of General Practitioners 15 (4): 251–7. PMID 5653294. 
  9. ↑ Joiner Jr., Thomas E. (2001-02-01). "Negative attributional style, hopelessness depression and endogenous depression". Behaviour Research and Therapy 39 (2): 139–149. doi:10.1016/S0005-7967(99)00160-6. PMID 11153969. 
  10. ↑ Watts, CA (1968). "The evolution of depressive symptoms in endogenous depression". J R Coll Gen Pract 15: 251–7. PMID 5653294. 
  11. ↑ Sinzig, Judith; Schmidt, Martin H.; Plueck, Julia (2011). "The Representation of Early Onset Depression by ICD-9 and ICD-10 Categories". Psychopathology 44 (6): 362–370. doi:10.1159/000325103. PMID 21847003. 
  12. ↑ Roy, A. (1987-04-01). "Five risk factors for depression." (in en). The British Journal of Psychiatry 150 (4): 536–541. doi:10.1192/bjp.150.4.536. ISSN 0007-1250. PMID 3664137. 
  13. ↑ "Electroconvulsive therapy (ECT) - Mayo Clinic". http://www.mayoclinic.org/tests-procedures/electroconvulsive-therapy/basics/definition/prc-20014161. 
  14. ↑ Strober, Michael; Rao, Uma; DeAntonio, Mark; Liston, Edward; State, Matthew; Amaya-Jackson, Lisa; Latz, Sara (1998). "Effects of Electroconvulsive Therapy in Adolescents with Severe Endogenous Depression Resistant to Pharmacotherapy". Biological Psychiatry 43 (5): 335–338. doi:10.1016/s0006-3223(97)00205-9. PMID 9513748. 
  15. ↑ Kramer, T (2002). "Endogenous Versus Exogenous: Still Not the Issue". Medscape Psychopharmacology Today. 7 1. 
  16. ↑ Watkins, JT; Leber WR; Imber SD; Collins JF; Elkin I; Pilkonis PA; Sotsky SM; Shea MT et al. (1993). "Temporal Course Of Change Of Depression". Journal of Consulting and Clinical Psychology. 5 61 (858): 64. doi:10.1037/0022-006x.61.5.858. 

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