During this project, decompression sickness became known as "The Grecian Bends" or simply "the bends" because affected individuals characteristically bent forward at the hips: this is possibly reminiscent of a then popular womens fashion and dance maneuver known as the Grecian Bend. 1890 During construction of the Hudson River Tunnel contractors agent Ernest William Moir pioneered the use of an airlock chamber for treatment. 1900: Leonard Hill used a frog model to prove that decompression causes bubbles and that recompression resolves them. Hill advocated linear or uniform decompression profiles. This type of decompression is used today by saturation divers. His work was financed by Augustus Siebe and the Siebe Gorman Company. 1904: Tunnel building to and from Manhattan Island caused over 3,000 injuries and over 30 deaths which led to laws requiring PSI limits and decompression rules for "sandhogs" in the United States. 1904: Siebe and Gorman in conjunction with Leonard Hill developed and produced a closed bell in which a diver can be decompressed at the surface. 1908: "The Prevention of Compressed Air Illness" was published by JS Haldane, Boycott and Damant recommending staged decompression. These tables were accepted for use by the Royal Navy. 1914–16: Experimental decompression chambers were in use on land and aboard ship. 1924: The US Navy published the first standardized recompression procedure. 1930s: Albert R Behnke separated the symptoms of Arterial Gas Embolism (AGE) from those of DCS. 1935: Behnke et al. experimented with oxygen for recompression therapy. 1937: Behnke introduced the "no-stop" decompression tables.
A mood disorder, also known as an affective disorder, is any of a group of conditions of mental and behavioral disorder where a disturbance in the persons mood is the main underlying feature. The classification is in the Diagnostic and Statistical Manual of Mental Disorders (DSM) and International Classification of Diseases (ICD). Mood disorders fall into seven groups, including; abnormally elevated mood, such as mania or hypomania; depressed mood, of which the best-known and most researched is major depressive disorder (MDD) (alternatively known as clinical depression, unipolar depression, or major depression); and moods which cycle between mania and depression, known as bipolar disorder (BD) (formerly known as manic depression). There are several sub-types of depressive disorders or psychiatric syndromes featuring less severe symptoms such as dysthymic disorder (similar to MDD, but longer lasting and more persistent, though often milder) and cyclothymic disorder (similar to but milder than BD).In some cases, more than one mood disorder can be present in an individual, like bipolar disorder and depressive disorder. If a mood disorder and schizophrenia are both present in an individual, this is known as schizoaffective disorder. Mood disorders may also be substance induced, or occur in response to a medical condition. English psychiatrist Henry Maudsley proposed an overarching category of affective disorder. The term was then replaced by mood disorder, as the latter term refers to the underlying or longitudinal emotional state, whereas the former refers to the external expression observed by others.