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Портал:Медицина

Медицинский портал

Цветная фреска Доменико ди Бартоло «Уход за больными» , 1441–1442 гг., с изображением больницы Санта-Мария-делла-Скала в Сиене, Италия.

Медицина — это наука и практика ухода за пациентами, управления диагностикой , прогнозированием , профилактикой , лечением , паллиативным лечением их травм или заболеваний и укрепления их здоровья . Медицина охватывает различные практики здравоохранения , разработанные для поддержания и восстановления здоровья путем профилактики и лечения заболеваний . Современная медицина применяет биомедицинские науки , биомедицинские исследования , генетику и медицинские технологии для диагностики , лечения и предотвращения травм и заболеваний, как правило, с помощью фармацевтических препаратов или хирургии , но также с помощью таких разнообразных методов лечения, как психотерапия , внешние шины и вытяжение , медицинские устройства , биологические препараты и ионизирующее излучение , среди прочего.

Медицина практикуется с доисторических времен , и большую часть этого времени это было искусство (область творчества и мастерства), часто связанное с религиозными и философскими верованиями местной культуры. Например, знахарь применял травы и читал молитвы об исцелении, или древний философ и врач применял кровопускание в соответствии с теориями гуморизма . В последние столетия, с появлением современной науки , большая часть медицины стала сочетанием искусства и науки (как базовой , так и прикладной , под эгидой медицинской науки ) . Например, в то время как техника наложения швов является искусством, изучаемым на практике, знание того, что происходит на клеточном и молекулярном уровне в сшиваемых тканях, возникает благодаря науке.

Донаучные формы медицины, теперь известные как традиционная медицина или народная медицина , остаются широко используемыми в отсутствие научной медицины и поэтому называются альтернативной медициной . Альтернативные методы лечения вне научной медицины с этическими, безопасными и эффективными проблемами называются шарлатанством . ( Полная статья... )

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  • Бригадир Нил Гамильтон Фэрли

    Бригадир сэр Нил Гамильтон Фэрли , KBE , CStJ , FRACP , FRCP , FRCPE , FRS (15 июля 1891 г. – 19 апреля 1966 г.) был австралийским врачом, ученым-медиком и офицером армии, который сыграл важную роль в спасении тысяч жизней союзников от малярии и других болезней.

    Выпускник Мельбурнского университета , где он был резидентом колледжа Ормонд , Фэрли присоединился к Медицинскому корпусу австралийской армии в 1915 году. Он исследовал эпидемию менингита , которая происходила в армейских лагерях в Австралии. Во время работы в 14-м госпитале общего профиля в Каире он исследовал шистосомоз (тогда известный как бильгарциоз) и разработал тесты и методы лечения этого заболевания. В межвоенный период он стал известен как эксперт по тропической медицине. ( Полная статья... )

  • β-Hydroxy β-methylbutyric acid (HMB), otherwise known as its conjugate base, β-hydroxy β-methylbutyrate, is a naturally produced substance in humans that is used as a dietary supplement and as an ingredient in certain medical foods that are intended to promote wound healing and provide nutritional support for people with muscle wasting due to cancer or HIV/AIDS. In healthy adults, supplementation with HMB has been shown to increase exercise-induced gains in muscle size, muscle strength, and lean body mass, reduce skeletal muscle damage from exercise, improve aerobic exercise performance, and expedite recovery from exercise. Medical reviews and meta-analyses indicate that HMB supplementation also helps to preserve or increase lean body mass and muscle strength in individuals experiencing age-related muscle loss. HMB produces these effects in part by stimulating the production of proteins and inhibiting the breakdown of proteins in muscle tissue. No adverse effects from long-term use as a dietary supplement in adults have been found.

    HMB is sold as a dietary supplement at a cost of about US$30–50 per month when taking 3 grams per day. HMB is also contained in several nutritional products, including certain formulations of Ensure and Juven. HMB is also present in insignificant quantities in certain foods, such as alfalfa, asparagus, avocados, cauliflower, grapefruit, and catfish. (Full article...)

  • A CBC specimen in front of a printout displaying CBC and differential results

    A complete blood count (CBC), also known as a full blood count (FBC), is a set of medical laboratory tests that provide information about the cells in a person's blood. The CBC indicates the counts of white blood cells, red blood cells and platelets, the concentration of hemoglobin, and the hematocrit (the volume percentage of red blood cells). The red blood cell indices, which indicate the average size and hemoglobin content of red blood cells, are also reported, and a white blood cell differential, which counts the different types of white blood cells, may be included.

    The CBC is often carried out as part of a medical assessment and can be used to monitor health or diagnose diseases. The results are interpreted by comparing them to reference ranges, which vary with sex and age. Conditions like anemia and thrombocytopenia are defined by abnormal complete blood count results. The red blood cell indices can provide information about the cause of a person's anemia such as iron deficiency and vitamin B12 deficiency, and the results of the white blood cell differential can help to diagnose viral, bacterial and parasitic infections and blood disorders like leukemia. Not all results falling outside of the reference range require medical intervention. (Full article...)

  • Amphetamine (contracted from alpha-methylphenethylamine) is a central nervous system (CNS) stimulant that is used in the treatment of attention deficit hyperactivity disorder (ADHD), narcolepsy, and obesity; it is also used to treat binge eating disorder in the form of its inactive prodrug lisdexamfetamine. Amphetamine was discovered as a chemical in 1887 by Lazăr Edeleanu, and then as a drug in the late 1920s. It exists as two enantiomers: levoamphetamine and dextroamphetamine. Amphetamine properly refers to a specific chemical, the racemic free base, which is equal parts of the two enantiomers in their pure amine forms. The term is frequently used informally to refer to any combination of the enantiomers, or to either of them alone. Historically, it has been used to treat nasal congestion and depression. Amphetamine is also used as an athletic performance enhancer and cognitive enhancer, and recreationally as an aphrodisiac and euphoriant. It is a prescription drug in many countries, and unauthorized possession and distribution of amphetamine are often tightly controlled due to the significant health risks associated with recreational use.

    The first amphetamine pharmaceutical was Benzedrine, a brand which was used to treat a variety of conditions. Currently, pharmaceutical amphetamine is prescribed as racemic amphetamine, Adderall, dextroamphetamine, or the inactive prodrug lisdexamfetamine. Amphetamine increases monoamine and excitatory neurotransmission in the brain, with its most pronounced effects targeting the norepinephrine and dopamine neurotransmitter systems. (Full article...)
  • Debora Green (née Jones; born February 28, 1951) is an American physician who pleaded no contest to setting a 1995 fire that burned down her family's home and killed two of her children, and to poisoning her husband with ricin with the intention of causing his death. The case was sensational, and covered heavily by news media, especially in the KansasMissouri area, where the crimes occurred. Though Green has petitioned for a new trial twice in recent years, her requests have not been successful.

    Green married Michael Farrar in 1979 while practicing as an emergency physician. The marriage was tumultuous, and Farrar filed for divorce in July 1995. Between August and September 1995, Farrar repeatedly fell violently ill, and despite numerous hospitalizations his doctors could not pinpoint the source of his illness. Green's emotional stability deteriorated and she began to drink heavily, even while supervising her children. On October 24, 1995, the Farrar family home, occupied by Green and the couple's three children — Timothy (age 13), Kate (age 10), and Kelly (age 6) — caught fire. Debora Green and Kate escaped without harm. Despite the efforts of firefighters, Timothy and Kelly died in the blaze. Investigation showed that trails of accelerant in the house led back to Green's bedroom, and that the source of Michael Farrar's intractable illness had been ricin, a poison served to him in his food by Green. (Full article...)

  • A D. medinensis worm emerges from a wound on a person's foot

    Dracunculiasis, also called Guinea-worm disease, is a parasitic infection by the Guinea worm, Dracunculus medinensis. A person becomes infected by drinking water contaminated with Guinea-worm larvae that reside inside copepods (a type of small crustacean). Stomach acid digests the copepod and releases the Guinea worm, which penetrates the digestive tract and escapes into the body. Around a year later, the adult female migrates to an exit site – usually the lower leg – and induces an intensely painful blister on the skin. Eventually, the blister bursts, creating a painful wound from which the worm gradually emerges over several weeks. The wound remains painful throughout the worm's emergence, disabling the affected person for the three to ten weeks it takes the worm to emerge.

    There is no medication to treat or prevent dracunculiasis. Instead, the mainstay of treatment is the careful wrapping of the emerging worm around a small stick or gauze to encourage and speed up its exit. Each day, a few more centimeters of the worm emerge, and the stick is turned to maintain gentle tension. Too much tension can break and kill the worm in the wound, causing severe pain and swelling. Dracunculiasis is a disease of extreme poverty, occurring in places with poor access to clean drinking water. Prevention efforts center on filtering drinking water to remove copepods, as well as public education campaigns to discourage people from soaking affected limbs in sources of drinking water, as this allows the worms to spread their larvae. (Full article...)

  • Computer–aided reconstruction of a rotavirus based on several electron micrographs

    Rotaviruses are the most common cause of diarrhoeal disease among infants and young children. Nearly every child in the world is infected with a rotavirus at least once by the age of five. Immunity develops with each infection, so subsequent infections are less severe. Adults are rarely affected. Rotavirus is a genus of double-stranded RNA viruses in the family Reoviridae. There are nine species of the genus, referred to as A, B, C, D, F, G, H, I and J. Rotavirus A is the most common species, and these rotaviruses cause more than 90% of rotavirus infections in humans.

    The virus is transmitted by the faecal–oral route. It infects and damages the cells that line the small intestine and causes gastroenteritis (which is often called "stomach flu" despite having no relation to influenza). Although rotavirus was discovered in 1973 by Ruth Bishop and her colleagues by electron micrograph images and accounts for approximately one third of hospitalisations for severe diarrhoea in infants and children, its importance has historically been underestimated within the public health community, particularly in developing countries. In addition to its impact on human health, rotavirus also infects other animals, and is a pathogen of livestock. (Full article...)

  • Cloth embroidered by a person diagnosed with schizophrenia

    Schizophrenia is a mental disorder characterized by hallucinations (typically hearing voices), delusions, disorganized thinking and behavior, and flat or inappropriate affect. Symptoms develop gradually and typically begin during young adulthood and are never resolved. There is no objective diagnostic test; diagnosis is based on observed behavior, a psychiatric history that includes the person's reported experiences, and reports of others familiar with the person. For a diagnosis of schizophrenia, the described symptoms need to have been present for at least six months (according to the DSM-5) or one month (according to the ICD-11). Many people with schizophrenia have other mental disorders, especially mood disorders, anxiety disorders, and obsessive–compulsive disorder.


    About 0.3% to 0.7% of people are diagnosed with schizophrenia during their lifetime. In 2017, there were an estimated 1.1 million new cases and in 2022 a total of 24 million cases globally. Males are more often affected and on average have an earlier onset than females. The causes of schizophrenia may include genetic and environmental factors. Genetic factors include a variety of common and rare genetic variants. Possible environmental factors include being raised in a city, childhood adversity, cannabis use during adolescence, infections, the age of a person's mother or father, and poor nutrition during pregnancy. (Full article...)
  • Illustration of a SARS-CoV-2 virion


    A virus is a tiny infectious agent that reproduces inside the cells of living hosts. When infected, the host cell is forced to rapidly produce thousands of identical copies of the original virus. Unlike most living things, viruses do not have cells that divide; new viruses assemble in the infected host cell. But unlike simpler infectious agents like prions, they contain genes, which allow them to mutate and evolve. Over 4,800 species of viruses have been described in detail out of the millions in the environment. Their origin is unclear: some may have evolved from plasmids—pieces of DNA that can move between cells—while others may have evolved from bacteria.

    Viruses are made of either two or three parts. All include genes. These genes contain the encoded biological information of the virus and are built from either DNA or RNA. All viruses are also covered with a protein coat to protect the genes. Some viruses may also have an envelope of fat-like substance that covers the protein coat, and makes them vulnerable to soap. A virus with this "viral envelope" uses it—along with specific receptors—to enter a new host cell. Viruses vary in shape from the simple helical and icosahedral to more complex structures. Viruses range in size from 20 to 300 nanometres; it would take 33,000 to 500,000 of them, side by side, to stretch to 1 centimetre (0.4 in). (Full article...)

  • Tatsuguchi soon after his induction into the Imperial Japanese Army in 1941 and his initial assignment to the First Imperial Guard Regiment in Tokyo
    Paul Nobuo Tatsuguchi (辰口 信夫, Tatsuguchi Nobuo), sometimes mistakenly referred to as Nebu Tatsuguchi (August 31, 1911 – May 30, 1943), was a Japanese soldier and surgeon who served in the Imperial Japanese Army (IJA) during World War II. He was killed during the Battle of Attu on Attu Island, Alaska, United States, on May 30, 1943.

    A devout Seventh-day Adventist, Tatsuguchi studied medicine and was licensed as a physician in the United States (US). He returned to his native Japan to practice medicine at the Tokyo Adventist Sanitarium, where he received further medical training. In 1941, he was ordered to cease his medical practice and conscripted into the IJA as an acting medical officer, although he was given an enlisted rather than officer rank because of his American connections. In late 1942, Tatsuguchi was sent to Attu, which had been occupied by Japanese forces in June 1942. On May 11, 1943, The United States Army landed on the island, intending to retake American soil from the Japanese. (Full article...)
  • Young people with polio receiving physiotherapy in the 1950s

    The social history of viruses describes the influence of viruses and viral infections on human history. Epidemics caused by viruses began when human behaviour changed during the Neolithic period, around 12,000 years ago, when humans developed more densely populated agricultural communities. This allowed viruses to spread rapidly and subsequently to become endemic. Viruses of plants and livestock also increased, and as humans became dependent on agriculture and farming, diseases such as potyviruses of potatoes and rinderpest of cattle had devastating consequences.

    Smallpox and measles viruses are among the oldest that infect humans. Having evolved from viruses that infected other animals, they first appeared in humans in Europe and North Africa thousands of years ago. The viruses were later carried to the New World by Europeans during the time of the Spanish Conquests, but the indigenous people had no natural resistance to the viruses and millions of them died during epidemics. Influenza pandemics have been recorded since 1580, and they have occurred with increasing frequency in subsequent centuries. The pandemic of 1918–19, in which 40–50 million died in less than a year, was one of the most devastating in history. (Full article...)
  • Menstrual cycle

    The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that makes pregnancy possible. The ovarian cycle controls the production and release of eggs and the cyclic release of estrogen and progesterone. The uterine cycle governs the preparation and maintenance of the lining of the uterus (womb) to receive an embryo. These cycles are concurrent and coordinated, normally last between 21 and 35 days, with a median length of 28 days. Menarche (the onset of the first period) usually occurs around the age of 12 years; menstrual cycles continue for about 30–45 years.

    Naturally occurring hormones drive the cycles; the cyclical rise and fall of the follicle stimulating hormone prompts the production and growth of oocytes (immature egg cells). The hormone estrogen stimulates the uterus lining (endometrium) to thicken to accommodate an embryo should fertilization occur. The blood supply of the thickened lining provides nutrients to a successfully implanted embryo. If implantation does not occur, the lining breaks down and blood is released. Triggered by falling progesterone levels, menstruation (a "period", in common parlance) is the cyclical shedding of the lining, and is a sign that pregnancy has not occurred. (Full article...)

  • The four primary symptoms of ME/CFS according to the National Institute for Health and Care Excellence

    Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a disabling chronic illness. People with ME/CFS experience profound fatigue that does not go away with rest, sleep issues, and problems with memory or concentration. Further common symptoms include dizziness, nausea and pain. The hallmark symptom is a worsening of the illness which starts hours to days after minor physical or mental activity. This "crash" can last from hours or days to several months.

    The cause of the disease is unknown. ME/CFS often starts after an infection, such as mononucleosis. It can run in families, but no genes that contribute to ME/CFS have been confirmed. ME/CFS is associated with changes in the nervous and immune systems, as well as in energy production. Diagnosis is based on symptoms because no diagnostic test is available. (Full article...)
  • Clear water pours from a spout into a drinking glass.
    Fluoridation does not affect the appearance, taste or smell of drinking water.


    Water fluoridation is the addition of fluoride to a public water supply to reduce tooth decay. Fluoridated water contains fluoride at a level that is effective for preventing cavities; this can occur naturally or by adding fluoride. Fluoridated water operates on tooth surfaces: in the mouth, it creates low levels of fluoride in saliva, which reduces the rate at which tooth enamel demineralizes and increases the rate at which it remineralizes in the early stages of cavities. Typically a fluoridated compound is added to drinking water, a process that in the U.S. costs an average of about $1.32 per person-year. Defluoridation is needed when the naturally occurring fluoride level exceeds recommended limits. In 2011, the World Health Organization suggested a level of fluoride from 0.5 to 1.5 mg/L (milligrams per litre), depending on climate, local environment, and other sources of fluoride. In 2024, the Department of Health and Human Services' National Toxicology Program found that water fluoridation levels above 1.5 mg/L are associated with lower IQ in children. In 2024, U.S. court rulings have raised concerns about the potential health risks of water fluoridation, including findings by the EPA and new risk assessments that suggest the benefits may be waning. Bottled water typically has unknown fluoride levels.


    Tooth decay remains a major public health concern in most industrialized countries, affecting 60–90% of schoolchildren and the vast majority of adults. Water fluoridation reduces cavities in children, while efficacy in adults is less clear. A Cochrane review estimates a reduction in cavities when water fluoridation was used by children who had no access to other sources of fluoride to be 35% in baby teeth and 26% in permanent teeth. Most European countries have experienced substantial declines in tooth decay, though milk and salt fluoridation is widespread in lieu of water fluoridation. Some studies suggest that water fluoridation, particularly in industrialized nations, may be unnecessary because topical fluorides (such as in toothpaste) are widely used, and caries rates have become low. (Full article...)

  • SARS-CoV-2, a member of the subfamily Coronavirinae

    A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. Viruses infect all life forms, from animals and plants to microorganisms, including bacteria and archaea. Viruses are found in almost every ecosystem on Earth and are the most numerous type of biological entity. Since Dmitri Ivanovsky's 1892 article describing a non-bacterial pathogen infecting tobacco plants and the discovery of the tobacco mosaic virus by Martinus Beijerinck in 1898, more than 11,000 of the millions of virus species have been described in detail. The study of viruses is known as virology, a subspeciality of microbiology.

    When infected, a host cell is often forced to rapidly produce thousands of copies of the original virus. When not inside an infected cell or in the process of infecting a cell, viruses exist in the form of independent viral particles, or virions, consisting of (i) genetic material, i.e., long molecules of DNA or RNA that encode the structure of the proteins by which the virus acts; (ii) a protein coat, the capsid, which surrounds and protects the genetic material; and in some cases (iii) an outside envelope of lipids. The shapes of these virus particles range from simple helical and icosahedral forms to more complex structures. Most virus species have virions too small to be seen with an optical microscope and are one-hundredth the size of most bacteria. (Full article...)

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