Search results
Results From The WOW.Com Content Network
Most SVTs are unpleasant rather than life-threatening, although very fast heart rates can be problematic for those with underlying ischemic heart disease, or the elderly. Episodes can be treated when they occur by Valsalva maneuver , adenosine injection or taking a AV node blocking agent as pill-in-pocket, but regular medication may also be ...
The cause is not known. [3] Risk factors include alcohol, psychostimulants such as caffeine, nicotine, and amphetamines, psychological stress, and Wolff-Parkinson-White syndrome, which often is inherited. [3] The underlying mechanism typically involves an accessory pathway that results in re-entry. [3]
The biology of depression is the attempt to identify a biochemical origin of depression, as opposed to theories that emphasize psychological or situational causes. Scientific studies have found that different brain areas show altered activity in humans with major depressive disorder (MDD) . [ 1 ]
[9] [10] Chronic stress, and a lack of coping resources available, or used by an individual, can often lead to the development of psychological issues such as delusions, [11] depression and anxiety (see below for further information). [12] Chronic stress also causes brain atrophy, which is the loss of neurons and the connections between them ...
The neurotrophic hypothesis of depression [1] proposes that major depressive disorder (MDD) is caused, at least partly, by impaired neurotrophic support.Neurotrophic factors (also known as neurotrophins) are a family of closely related proteins which regulate the survival, development, and function of neurons in both the central and peripheral nervous systems.
The neurogenesis hypothesis of depression gained popularity due to the large number of correlative studies which indicate a relationship between impaired hippocampal neurogenesis and depression. For example, reduced hippocampal volume is associated with depression, which impaired neurogenesis may contribute to. [6] Conflicting evidence
Within the next twenty years depression is expected to become the second leading cause of disability worldwide and the leading cause in high-income nations, including the United States. In approximately 75% of suicides, the individuals had seen a physician within the prior year before their death, 45–66% within the prior month.
Risk factors for mental illness include psychological trauma, adverse childhood experiences, genetic predisposition, and personality traits. [7] [8] Correlations between mental disorders and substance use are also found to have a two way relationship, in that substance use can lead to the development of mental disorders and having mental disorders can lead to substance use/abuse.