Long Term Depression
Depression is a clinical illness and it is one of the most common and serious mental health problems facing people today. Dysthymia, which is often referred to as long-term depression is characterized by persistent depressive symptoms, which lasts for several years. While the symptoms of long-term depression are not disable as those suffering from major depression, people who suffer from this depressive condition significantly decreased energy and general negativity. An overall sense of dissatisfaction and despair saturates. There is nothing to blame the beginning of dysthymia and no significant loss or no change in the life. But it can be confusing and frustrating for the person suffering from the depression, as well as for family, friends, and co-workers.
Long-term depression in intact cerebellum is decrease in the efficiency of the parallel fiber-Purkinje neuron synapse induced by coactivation of climbing fiber and parallel fiber inputs. In cultured Purkinje neurons, there is an iontophoretic glutamate pulses and Purkinje neuron depolarization can induce a similar depression. This form of LTD is expressed as a depression of alpha-amino-3-hydroxy-5-methyl-4- isoxazole-propionic acid (AMPA)-mediated current, and its induction is dependent on activation of metabotropic quisqualate receptors. The effect of inhibitors of protein kinase C on LTD induction was studied. Inhibitor of PKC has blocked LTD induction; while phorbol-12, 13-diacetate (PDA), a PKC activator, mimicked LTD. Finally, these results suggest that PKC activation is necessary for the induction of cerebellar LTD.
There are two broad types of long-term depression. Heterosynaptic LTD can happen at synapses, which are not active, because of high-frequency stimulation of a converging synaptic input. As, Heterosynaptic LTD can occur at synapses, that are activated, normally at low frequencies. Severe illness or long-term depression can bring on or aggravate dysthymia. Chronic pain patients are up to 60% suffer from some degree of clinical depression. And also some illnesses, which may be directly, related to depressive disorders, such as strokes, heart disease, certain types of cancer, thyroid disease, diabetes, Parkinson's disease, Alzheimer's disease, and hormonal abnormalities. Research has revealed that dysthymia can occur with anxiety disorders (e.g., panic disorder, obsessive-compulsive disorder, post-traumatic stress disorder, social phobia, or generalized anxiety disorder). Dysthymia rates are especially high in people with post-traumatic stress disorder, a debilitating condition that can occur after exposure to a terrifying event or ordeal in which severe physical harm occurred or was threatened.
Studies have shown that suicide attempts are increased in people with co-occurring dysthymia and panic disorder, the anxiety disorder characterized by unexpected and repeated episodes of intense fear and physical symptoms, including chest pain, dizziness, and shortness of breath. The American Psychiatric Association reports that 80% to 90% of all people are suffering from depressive disorders and those with the severest cases can improve once they receive appropriate treatment. There are some ways to treat dysthymia including therapy, medication, and a combination of the two. As it occurs with other illnesses, dysthymia is frequently unrecognized and goes untreated. This may lead to unnecessary suffering since dysthymia is highly treatable, even when it occurs with other disorders. Family members or friends with concerns about the occurrence of depression with another illness should discuss the issue with their physician.