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Obstruction
Obstruction may refer to: Places * Obstruction Island, in Washington state * Obstruction Islands, east of New Guinea Medicine * Obstructive jaundice * Obstructive sleep apnea * Airway obstruction, a respiratory problem ** Recurrent airway obstruction * Bowel obstruction, a blockage of the intestines. * Gastric outlet obstruction * Distal intestinal obstruction syndrome * Congenital lacrimal duct obstruction * Bladder outlet obstruction Politics and law * Obstruction of justice, the crime of interfering with law enforcement * Obstructionism, the practice of deliberately delaying or preventing a process or change, especially in politics * Emergency Workers (Obstruction) Act 2006 Science and mathematics * Obstruction set in forbidden graph characterizations, in the study of graph minors in graph theory * Obstruction theory, in mathematics * Propagation path obstruction ** Single Vegetative Obstruction Model Sports * Obstruction (baseball), when a fielder illegally hinders a bas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bowel Obstruction
Bowel obstruction, also known as intestinal obstruction, is a mechanical or Ileus, functional obstruction of the Gastrointestinal tract#Lower gastrointestinal tract, intestines which prevents the normal movement of the products of digestion. Either the Small intestine, small bowel or Large intestine, large bowel may be affected. Signs and symptoms include abdominal pain, vomiting, abdominal bloating, bloating and not passing flatulence, gas. Mechanical obstruction is the cause of about 5 to 15% of cases of acute abdomen, severe abdominal pain of sudden onset requiring admission to hospital. Causes of bowel obstruction include Adhesion (medicine), adhesions, hernias, volvulus, endometriosis, inflammatory bowel disease, appendicitis, Neoplasm, tumors, diverticulitis, ischemic colitis, ischemic bowel, tuberculosis and intussusception (medical disorder), intussusception. Small bowel obstructions are most often due to adhesions and hernias while large bowel obstructions are most often ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Obstruction (baseball)
In baseball, obstruction is when a fielder illegally hinders a baserunner running within the basepath. Baserunners are generally permitted to run from base to base without being physically blocked or hindered by a fielder. The only time that a fielder is not obligated to "get out of the way" of a baserunner is when the fielder is fielding a hit ball or in possession of the ball. Definition Official Baseball Rule 2.00 defines obstruction as: The comment to Rule 7.09(j) adds that High school and college versions of the rule also add rules against malicious or flagrant contact. Types of obstruction and corresponding penalties Any case of obstruction falls into one of two categories (formerly called type "A" and type "B" until the 2014 rewriting of the MLB Umpire rulebook), after the subsection of Rule 6.01(h), in which each type of obstruction, and the corresponding penalties, are described.https://content.mlb.com/documents/2/2/4/305750224/2019_Official_Baseball_Rules_FINAL_.p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Obstruction Of Justice
Obstruction of justice, in United States jurisdictions, is an act that involves unduly influencing, impeding, or otherwise interfering with the justice system, especially the legal and procedural tasks of prosecutors, investigators, or other government officials. Common law jurisdictions other than the United States tend to use the wider offense of perverting the course of justice. Obstruction is a broad crime that may include acts such as perjury, making false statements to officials, witness tampering, jury tampering, destruction of evidence, and many others. Obstruction also applies to overt coercion of court or government officials via the means of threats or actual physical harm, and also applying to deliberate sedition against a court official to undermine the appearance of legitimate authority. Legal overview Obstruction of justice is an umbrella term covering a variety of specific crimes. '' Black's Law Dictionary'' defines it as any "interference with the orderly admini ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bladder Outlet Obstruction
Bladder outlet obstruction (or obstructive uropathy) occurs when urine is unable to flow from the kidneys through the ureters and out of the Urinary bladder, bladder through the urethra. Decreased flow of urine leads to swelling of the urinary tract, called hydronephrosis. This process of decreased flow of urine through the urinary tract can begin as early as during intrauterine life and it prevents normal development of fetal kidneys and fetal urine. Low levels of fetal urine leads to low amniotic fluid levels and Pulmonary hypoplasia, incomplete lung maturation. Older children and adults can also experience bladder outlet obstruction; however, this process is usually reversible and isn't associated with as many poor outcomes as in infants with congenital bladder outlet obstruction. Causes Bladder outlet obstruction is classified based on where along the Urinary system, urinary tract the obstruction occurs, including upper urinary tract obstruction and lower urinary tract obstru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Congenital Lacrimal Duct Obstruction
Nasolacrimal duct obstruction is the obstruction of the nasolacrimal duct and may be either congenital or acquired. Obstruction of the nasolacrimal duct leads to the excess overflow of tears called epiphora. Sign and symptoms Excessive tearing is the most common complaint of patients with nasolacrimal duct obstruction, followed by acute or chronic infections. Pain at the side of the nose suggests dacryocystitis. Nasolacrimal duct obstruction is more common with increasing age and more common in females than males. Cause Involutional stenosis Involutional stenosis is probably the most common cause of nasolacrimal duct obstruction in older people. It affects women twice as frequently as men. Although the inciting event in this process is unknown, clinicopathologic study suggests that compression of the lumen of the nasolacrimal duct is caused by inflammatory infiltrates and edema. This may be the result of an unidentified infection or possibly an autoimmune disease. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Obstructive Sleep Apnea
Obstructive sleep apnea (OSA) is the most common sleep-related breathing disorder and is characterized by recurrent episodes of complete or partial obstruction of the upper airway leading to reduced or absent breathing during sleep. These episodes are termed "apneas" with complete or near-complete cessation of breathing, or "hypopneas" when the reduction in breathing is partial. In either case, a fall in blood oxygen saturation, a disruption in sleep, or both may result. A high frequency of apneas or hypopneas during sleep may interfere with restorative sleep, whichin combination with disturbances in blood oxygenationis thought to contribute to negative consequences to health and quality of life. The terms obstructive sleep apnea syndrome (OSAS) or obstructive sleep apnea–hypopnea syndrome (OSAHS) may be used to refer to OSA when it is associated with symptoms during the daytime (e.g. excessive daytime sleepiness, decreased cognitive function). Most individuals with OSA are un ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Airway Obstruction
Airway obstruction is a blockage of respiration in the airway that hinders the free flow of air. It can be broadly classified into being either in the upper airway (UPA) or lower airway (LOA). Airway obstruction is a life-threatening condition and requires urgent attention, and assistance when it is needed. The assistance to clear an upper airway obstruction would begin employing first-aid anti-choking techniques. Upper airway obstruction Causes of upper airway obstruction include foreign body aspiration, blunt laryngotracheal trauma, penetrating laryngotracheal trauma, tonsillar hypertrophy, paralysis of the vocal cord or vocal fold, acute laryngotracheitis such as viral croup, bacterial tracheitis, epiglottitis, peritonsillar abscess, pertussis, retropharyngeal abscess, spasmodic croup. In basic and advanced life support airway obstructions are often referred to as ''A-problems''. Management of airways relies on both minimal-invasive and invasive techniques. Lower airw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastric Outlet Obstruction
Gastric outlet obstruction (GOO) is a medical condition where there is an obstruction at the level of the pylorus, which is the outlet of the stomach. Individuals with gastric outlet obstruction will often have recurrent vomiting of food that has accumulated in the stomach, but which cannot pass into the small intestine due to the obstruction. The stomach often dilates to accommodate food intake and secretions. Causes of gastric outlet obstruction include both benign causes (such as peptic ulcer disease affecting the area around the pylorus), as well as malignant causes, such as gastric cancer. Causation related to ulcers may involve severe pain which the patient may interpret as a heart condition or attack. Treatment of the condition depends upon the underlying cause; it can involve antibiotic treatment when ''Helicobacter pylori'' is related to an ulcer, endoscopic therapies (such as dilation of the obstruction with balloons or the placement of self-expandable metallic stents ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Obstructionism
Obstructionism is the practice of deliberately delaying or preventing a process or change, especially in politics. As workplace aggression An obstructionist causes problems. Neuman and Baron (1998) identify obstructionism as one of the three dimensions that encompass the range of workplace aggression. In this context, obstructionism is "behaviors intended to hinder an employee from performing their job or the organization from accomplishing its objectives". In politics Obstructionism or policy of obstruction denotes the deliberate interference with the progress of a legislation by various means such as filibustering or slow walking which may depend on the respective parliamentary procedures. As political strategy Obstructionism can also take the form of widespread agreement to oppose policies from the other side of a political debate or dispute. Mass media In September 2010, Jon Stewart of ''The Daily Show'' announced the Rally to Restore Sanity and/or Fear, an event dedicate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Obstruction Theory
In mathematics, obstruction theory is a name given to two different mathematical theories, both of which yield cohomological invariants. In the original work of Stiefel and Whitney, characteristic classes were defined as obstructions to the existence of certain fields of linear independent vectors. Obstruction theory turns out to be an application of cohomology theory to the problem of constructing a cross-section of a bundle. In homotopy theory The older meaning for obstruction theory in homotopy theory relates to the procedure, inductive with respect to dimension, for extending a continuous mapping defined on a simplicial complex, or CW complex. It is traditionally called ''Eilenberg obstruction theory'', after Samuel Eilenberg. It involves cohomology groups with coefficients in homotopy groups to define obstructions to extensions. For example, with a mapping from a simplicial complex ''X'' to another, ''Y'', defined initially on the 0-skeleton of ''X'' (the vertices of ''X'') ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Forbidden Graph Characterization
In graph theory, a branch of mathematics, many important families of graphs can be described by a finite set of individual graphs that do not belong to the family and further exclude all graphs from the family which contain any of these forbidden graphs as (induced) subgraph or minor. A prototypical example of this phenomenon is Kuratowski's theorem, which states that a graph is planar (can be drawn without crossings in the plane) if and only if it does not contain either of two forbidden graphs, the complete graph and the complete bipartite graph . For Kuratowski's theorem, the notion of containment is that of graph homeomorphism, in which a subdivision of one graph appears as a subgraph of the other. Thus, every graph either has a planar drawing (in which case it belongs to the family of planar graphs) or it has a subdivision of at least one of these two graphs as a subgraph (in which case it does not belong to the planar graphs). Definition More generally, a forbidden grap ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Five Obstructions
''The Five Obstructions'' is a 2003 Danish documentary film directed by Lars von Trier and Jørgen Leth. The film is conceived as a documentary, but incorporates lengthy sections of experimental films produced by the filmmakers. The premise is that von Trier has created a challenge for his friend and mentor, Jørgen Leth, another renowned filmmaker. Lars von Trier's favorite film is Leth's ''The Perfect Human'', and von Trier gives Leth the task of remaking ''The Perfect Human'' five times, each time with a different "obstruction" (or obstacle) imposed by von Trier. It has been said that "Both this film and ''Dogville'' show a more mature von Trier, one who is more aware of and accountable to the full implications of the torture, suffering and victimization he has employed in his films, especially in exploring how easily those who victimize others in the name of righteousness become victims ftheir own self-righteousness." The obstructions #Leth must remake the film in Cuba, wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
