نقص الثيامين

Thiamine deficiency[1]
الأسماء الأخرىبري بري، نقص فيتامين ب1، متلازمة نقص الثيامين[1][2]
Beriberi USNLM.jpg
مريض بمرض البري بري خلال أوائل القرن العشرين في جنوب شرق آسيا، يُظهر صعوبة مميزة في المشي
التخصصطب الجهاز العصبي، طب القلب، طب الأطفال
الأعراض
  • Wet: سرعة دقات القلب، ضيق التنفس، تورم الساق[1]
  • Dry: الخدر، الارتباك، صعوبة في تحريك الساقين، الألم[1]
الأنواعرطب، جاف، معدي معوي[3]
المسبباتالثيامين الغير كافي[1]
عوامل الخطرحمية معظمها أرز أبيض؛ إدمان الكحول، غسيل الكلى، الإسهال المزمن، مدرات البول[1][4]
الوقايةإغناء الطعام[1]
العلاجمكملات الثيامين[1]
الترددRare (US)[1]

قالب:TOC Right نقص الثيامين Thiamine deficiency هو حالة طبية ذات مستويات منخفضة من الثيامين (فيتامين ب1). [1]يُعرف الشكل الحاد والمزمن باسم البري بري.[1][5]هناك نوعان رئيسيان لدى البالغين: البري بري الرطب، البري بري الجاف.[1] يؤثر مرض البري بري الرطب على نظام القلب والأوعية الدموية مما يؤدي إلى تسارع معدل ضربات القلب، ضيق التنفس، و تورم الساق.[1] يؤثر مرض البري بري الجاف على الجهاز العصبي مما يؤدي إلى تنميل في اليدين والقدمين والارتباك وصعوبة في تحريك الساقين والألم. [1] فقدان الشهية وقد يحدث الإمساك أيضاً.[3] يوجد نوع آخر، وهو مرض البري بري الحاد، غالباً عند الأطفال وأعراضه فقدان الشهية والقيء الحماض اللبني والتغيرات في معدل ضربات القلب وتضخم القلب.[6]

تشمل عوامل الخطر اتباع نظام غذائي يتكون في الغالب من الأرز الأبيض، إدمان الكحول، غسيل الكلى، الإسهال المزمن، وتناول جرعات عالية من مدرات البول.[1][4] في حالات نادرة، قد يكون بسبب حالة وراثية تؤدي إلى صعوبات في امتصاص الثيامين الموجود في الطعام.[1]اعتلال دماغي فرنكي و متلازمة كورساكوف هما شكلا من أشكال مرض البري بري الجاف.[4]يعتمد التشخيص على الأعراض، وانخفاض مستويات الثيامين في البول، وارتفاع نسبة اللاكتات في الدم، والتحسن مع مكملات الثيامين.[7]

يتم العلاج عن طريق مكملات الثيامين، إما عن طريق الفم أو عن طريق الحقن. [1] مع العلاج، تختفي الأعراض عموماً في غضون أسبوعين.[7] قد يتم منع المرض على مستوى السكان من خلال إغناء الطعام. [1]

يعد نقص الثيامين نادراً في الولايات المتحدة.[8] لا يزال منتشراً نسبياً في أفريقيا جنوب الصحراء.[2]شوهدت حالات تفشي المرض في مخيمات اللاجئين.[4]وُصف نقص الثيامين منذ آلاف السنين في آسيا، وأصبح أكثر شيوعاً في أواخر القرن التاسع عشر مع زيادة معالجة الأرز.[9]

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العلامات والأعراض

تشمل أعراض مرض البري بري فقدان الوزن و المشاعر والاضطرابات الأخرى وضعف الإدراك الحسي و الضعف و الألم في الأطراف وفترات غير منتظمة معدل ضربات القلب. الوذمة (تورم في أنسجة الجسم) أمر شائع. قد يزيد من كمية حمض اللاكتيك و حمض الپيروڤيك في الدم. في الحالات المتقدمة، قد يتسبب المرض في قصور قلب عالي النتاج والوفاة.

قد تحدث الأعراض بشكل متزامن مع أعراض اعتلال دماغي فرنكي، وهي حالة متعلقة بنقص الثيامين العصبي في المقام الأول.

ينقسم البري بري إلى أربع فئات على النحو التالي. الثلاثة الأولى تاريخية والرابع، البري بري المعدي المعوي، تم الاعتراف به في عام 2004:

  • يؤثر مرض البري بري بشكل خاص على الجهاز العصبي المحيطي.
  • يؤثر مرض البري بري بشكل خاص على نظام القلب والأوعية الدموية وأنظمة الجسم الأخرى.
  • يصيب مرض "البري بري الطفلي" أطفال الأمهات اللائي يعانين من سوء التغذية.
  • يؤثر مرض "البري بري" "البري بري الجهاز الهضمي" على الجهاز الهضمي وأنظمة الجسم الأخرى.


البري بري الجاف

يسبب مرض البري بري الجاف الهزال و الشلل الجزئي الناتج عن تلف الأعصاب الطرفية. ويشار إليه أيضاً باسم التهاب العصب المتوطن. يتميز بـ:

  • صعوبة في المشي
  • وخز أو فقدان الإحساس (تنميل) في اليدين والقدمين
  • فقدان ردود الفعل الوترية[10]
  • فقدان وظيفة العضلات أو شلل في أسفل الساقين
  • تشوش ذهني / صعوبات في الكلام
  • الألم
  • حركات العين اللاإرادية (رأرأة)
  • التقيؤ

يمكن أن يحدث ضعف انتقائي للألياف الحسية التحسسية الكبيرة بدون ضعف حركي ويظهر كإحساس بارز بالترنح، وهو فقدان التوازن والتنسيق بسبب فقدان مدخلات التحفيز التحسسي من الأطراف وفقدان الإحساس بالموضع.[11]

Brain disease

Wernicke's encephalopathy (WE), Korsakoff syndrome (alcohol amnestic disorder), and Wernicke–Korsakoff syndrome are forms of dry beriberi.[4]

Wernicke's encephalopathy is the most frequently encountered manifestation of thiamine deficiency in Western society,[12][13] though it may also occur in patients with impaired nutrition from other causes, such as gastrointestinal disease,[12] those with HIV/AIDS, and with the injudicious administration of parenteral glucose or hyperalimentation without adequate B-vitamin supplementation.[14] This is a striking neuro-psychiatric disorder characterized by paralysis of eye movements, abnormal stance and gait, and markedly deranged mental function.[15]

Korsakoff syndrome is, in general, considered to occur with deterioration of brain function in patients initially diagnosed with WE.[16] This is an amnestic-confabulatory syndrome characterized by retrograde and anterograde amnesia, impairment of conceptual functions, and decreased spontaneity and initiative.[17]

Alcoholics may have thiamine deficiency because of the following:

  • Inadequate nutritional intake: Alcoholics tend to intake less than the recommended amount of thiamine.
  • Decreased uptake of thiamine from the GI tract: Active transport of thiamine into enterocytes is disturbed during acute alcohol exposure.
  • Liver thiamine stores are reduced due to hepatic steatosis or fibrosis.[18]
  • Impaired thiamine utilization: Magnesium, which is required for the binding of thiamine to thiamine-using enzymes within the cell, is also deficient due to chronic alcohol consumption. The inefficient utilization of any thiamine that does reach the cells will further exacerbate the thiamine deficiency.
  • Ethanol per se inhibits thiamine transport in the gastrointestinal system and blocks phosphorylation of thiamine to its cofactor form (ThDP).[19]

Following improved nutrition and the removal of alcohol consumption, some impairments linked with thiamine deficiency are reversed, in particular poor brain functionality, although in more severe cases, Wernicke–Korsakoff syndrome leaves permanent damage. (See delirium tremens.)

Wet beriberi

Wet beriberi affects the heart and circulatory system. It is sometimes fatal, as it causes a combination of heart failure and weakening of the capillary walls, which causes the peripheral tissues to become edematous. Wet beriberi is characterized by:

Gastrointestinal beriberi

Gastrointestinal beriberi causes abdominal pain. Gastrointestinal beriberi is characterized by:

  • Abdominal pain
  • Nausea
  • Vomiting
  • Lactic acidosis[26][27]

Infants

Infantile beriberi usually occurs between two and six months of age in children whose mothers have inadequate thiamine intake. It may present as either wet or dry beriberi.[2]

In the acute form, the baby develops dyspnea and cyanosis and soon dies of heart failure. These symptoms may be described in infantile beriberi:

  • Hoarseness, where the child makes moves to moan but emits no sound or just faint moans[28] caused by nerve paralysis[10]
  • Weight loss, becoming thinner and then marasmic as the disease progresses[28]
  • Vomiting[28]
  • Diarrhea[28]
  • Pale skin[10]
  • Edema[10][28]
  • Ill temper[10]
  • Alterations of the cardiovascular system, especially tachycardia (rapid heart rate)[10]
  • Convulsions occasionally observed in the terminal stages[28]

Cause

Beriberi may also be caused by shortcomings other than inadequate intake: diseases or operations on the digestive tract, alcoholism,[21] dialysis or genetic deficiencies. All those causes mainly affect the central nervous system, and provoke the development of what is known as Wernicke's disease or Wernicke's encephalopathy.

Wernicke's disease is one of the most prevalent neurological or neuropsychiatric diseases.[29] In autopsy series, features of Wernicke lesions are observed in approximately 2% of general cases.[30] Medical record research shows that about 85% had not been diagnosed, although only 19% would be asymptomatic. In children, only 58% were diagnosed. In alcohol abusers, autopsy series showed neurological damages at rates of 12.5% or more. Mortality caused by Wernicke's disease reaches 17% of diseases, which means 3.4/1000 or about 25 million contemporaries.[31][32] The number of people with Wernicke's disease may be even higher, considering that early stages may have dysfunctions prior to the production of observable lesions at necropsy. In addition, uncounted numbers of people can experience fetal damage and subsequent diseases.

Genetics

Genetic diseases of thiamine transport are rare but serious. Thiamine responsive megaloblastic anemia syndrome (TRMA) with diabetes mellitus and sensorineural deafness[33] is an autosomal recessive disorder caused by mutations in the gene SLC19A2,[34] a high affinity thiamine transporter. TRMA patients do not show signs of systemic thiamine deficiency, suggesting redundancy in the thiamine transport system. This has led to the discovery of a second high-affinity thiamine transporter, SLC19A3.[35][36] Leigh disease (subacute necrotising encephalomyelopathy) is an inherited disorder that affects mostly infants in the first years of life and is invariably fatal. Pathological similarities between Leigh disease and WE led to the hypothesis that the cause was a defect in thiamine metabolism. One of the most consistent findings has been an abnormality of the activation of the pyruvate dehydrogenase complex.[37]

Mutations in the SLC19A3 gene have been linked to biotin-thiamine responsive basal ganglia disease,[38] which is treated with pharmacological doses of thiamine and biotin, another B vitamin.

Other disorders in which a putative role for thiamine has been implicated include subacute necrotising encephalomyelopathy, opsoclonus myoclonus syndrome (a paraneoplastic syndrome), and Nigerian seasonal ataxia (or African seasonal ataxia). In addition, several inherited disorders of ThDP-dependent enzymes have been reported,[39] which may respond to thiamine treatment.[17]

Pathophysiology

Thiamine in the human body has a half-life of 18 days and is quickly exhausted, particularly when metabolic demands exceed intake. A derivative of thiamine, thiamine pyrophosphate (TPP), is a cofactor involved in the citric acid cycle, as well as connecting the breakdown of sugars with the citric acid cycle. The citric acid cycle is a central metabolic pathway involved in the regulation of carbohydrate, lipid, and amino acid metabolism, and its disruption due to thiamine deficiency inhibits the production of many molecules including the neurotransmitters glutamic acid and GABA.[40] Additionally thiamine may also be directly involved in neuromodulation.[41]

Diagnosis

Oxidation of thiamine derivatives to fluorescent thiochromes by potassium ferricyanide under alkaline conditions

A positive diagnosis test for thiamine deficiency involves measuring the activity of the enzyme transketolase in erythrocytes (Erythrocyte transketolase activation assay). Alternatively, thiamine and its phosphorylated derivatives can directly be detected in whole blood, tissues, foods, animal feed, and pharmaceutical preparations following the conversion of thiamine to fluorescent thiochrome derivatives (Thiochrome assay) and separation by high-performance liquid chromatography (HPLC).[42][43][44] Capillary electrophoresis (CE) techniques and in-capillary enzyme reaction methods have emerged as alternative techniques in quantifying and monitoring thiamine levels in samples.[45] The normal thiamine concentration in EDTA-blood is about 20-100 µg/l.


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Treatment

Many people with beriberi can be treated with thiamine alone.[46] Given thiamine intravenously (and later orally), rapid and dramatic[21] recovery occurs, generally within 24 hours.[47]

Improvements of peripheral neuropathy may require several months of thiamine treatment.[48]

Epidemiology

Beriberi is a recurrent nutritional disease in detention houses, even in this century. In 1999, an outbreak of beriberi occurred in a detention center in Taiwan.[49] High rates of illness and death in overcrowded Haitian jails in 2007 were traced to the traditional practice of washing rice before cooking.[50] In the Ivory Coast, among a group of prisoners with heavy punishment, 64% were affected by beriberi. Before beginning treatment, prisoners exhibited symptoms of dry or wet beriberi with neurological signs (tingling: 41%), cardiovascular signs (dyspnoea: 42%, thoracic pain: 35%), and edemas of the lower limbs (51%). With treatment the rate of healing was about 97%.[51]

Populations under extreme stress may be at higher risk for beriberi. Displaced populations, such as refugees from war, are susceptible to micronutritional deficiency, including beriberi.[52] The severe nutritional deprivation caused by famine also can cause beriberis, although symptoms may be overlooked in clinical assessment or masked by other famine-related problems.[53] An extreme weight-loss diet can, rarely, induce a famine-like state and the accompanying beriberi.[21]

History

Earliest written descriptions of thiamine deficiency are from Ancient China in the context of Chinese medicine. One of the earliest is by Ge Hong in his book Zhou hou bei ji fang (Emergency Formulas to Keep up Your Sleeve) written sometime during the 3rd century. Hong called the illness by the name jiao qi, which can be interpreted as "foot qi". He described the symptoms to include swelling, weakness and numbness of the feet. He also acknowledged that the illness could be deadly, and claimed that it could be cured by eating certain foods such as fermented soybeans in wine. Better known examples of early descriptions of "foot qi" are by Chao Yuanfang (who lived during 550–630) in his book Zhu bing yuan hou lun (Sources and Symptoms of All Diseases)[54][55] and by Sun Simiao (581–682) in his book Bei ji qian jin yao fang (Essential Emergency Formulas Worth a Thousand in Gold).[56][55][57][58]

In the late 19th century, beriberi was studied by Takaki Kanehiro, a British-trained Japanese medical doctor of the Imperial Japanese Navy.[59] Beriberi was a serious problem in the Japanese navy: Sailors fell ill an average of four times a year in the period 1878 to 1881, and 35% were cases of beriberi.[59] In 1883, Takaki learned of a very high incidence of beriberi among cadets on a training mission from Japan to Hawaii, via New Zealand and South America. The voyage lasted more than nine months and resulted in 169 cases of sickness and 25 deaths on a ship of 376 men. With the support of the Japanese Navy, he conducted an experiment in which another ship was deployed on the same route, except that its crew was fed a diet of meat, fish, barley, rice, and beans. At the end of the voyage, this crew had only 14 cases of beriberi and no deaths. This convinced Takaki and the Japanese Navy that diet was the cause.[59] In 1884, Takaki observed that beriberi was common among low-ranking crew who were often provided free rice and thus ate little else, but not among crews of Western navies, nor among Japanese officers who consumed a more varied diet.

In 1897, Christiaan Eijkman, a Dutch physician and pathologist, demonstrated that beriberi is caused by poor diet, and discovered that feeding unpolished rice (instead of the polished variety) to chickens helped to prevent beriberi. The following year, Sir Frederick Hopkins postulated that some foods contained "accessory factors"—in addition to proteins, carbohydrates, fats, and salt—that were necessary for the functions of the human body.[60][61] In 1901, Gerrit Grijns, a Dutch physician and assistant to Christiaan Eijkman in the Netherlands, correctly interpreted beriberi as a deficiency syndrome,[62] and between 1910 and 1913, Edward Bright Vedder established that an extract of rice bran is a treatment for beriberi.[بحاجة لمصدر] In 1929, Eijkman and Hopkins were awarded the Nobel Prize for Physiology or Medicine for their discoveries.

Etymology

Although according to the Oxford English Dictionary, the term "beriberi" comes from a Sinhalese phrase meaning "weak, weak" or "I cannot, I cannot", the word being duplicated for emphasis,[63] the origin of the phrase is questionable. It has also been suggested to come from Hindi, Arabic and a few other languages, with many meanings like "weakness", "sailor" and even "sheep". Such suggested origins were listed by Heinrich Botho Scheube among others. Edward Vedder wrote in his book Beriberi (1913) that "it is impossible to definitely trace the origin of the word beriberi". Word berbere was used in writing at least as early as 1568 by Diogo do Couto, when he described the deficiency in India.[64]

"Kakke", which is a Japanese synonym for thiamine deficiency, comes from the way "jiao qi" is pronounced in Japanese.[65] "Jiao qi" is an old word used in Chinese medicine to describe beriberi.[54] "Kakke" is supposed to have entered into the Japanese language sometime between the 6th and 8th centuries.[65]

Other animals

Poultry

As most feedstuffs used in poultry diets contain enough quantities of vitamins to meet the requirements in this species, deficiencies in this vitamin do not occur with commercial diets. This was, at least, the opinion in the 1960s.[66]

Mature chickens show signs three weeks after being fed a deficient diet. In young chicks, it can appear before two weeks of age. Onset is sudden in young chicks. There is anorexia and an unsteady gait. Later on, there are locomotor signs, beginning with an apparent paralysis of the flexor of the toes. The characteristic position is called "stargazing", with the afflicted animal sitting on its hocks with its head thrown back in a posture called opisthotonos.

Response to administration of the vitamin is rather quick, occurring a few hours later.[67][68]

Ruminants

Polioencephalomalacia (PEM) is the most common thiamine deficiency disorder in young ruminant and nonruminant animals. Symptoms of PEM include a profuse, but transient, diarrhea, listlessness, circling movements, star gazing or opisthotonus (head drawn back over neck), and muscle tremors.[69] The most common cause is high-carbohydrate feeds, leading to the overgrowth of thiaminase-producing bacteria, but dietary ingestion of thiaminase (e.g., in bracken fern), or inhibition of thiamine absorption by high sulfur intake are also possible.[70] Another cause of PEM is Clostridium sporogenes or Bacillus aneurinolyticus infection. These bacteria produce thiaminases that will cause an acute thiamine deficiency in the affected animal.[71]

Snakes

Snakes that consume a diet largely composed of goldfish and feeder minnows are susceptible to developing thiamine deficiency. This is often a problem observed in captivity when keeping garter and ribbon snakes that are fed a goldfish-exclusive diet, as these fish contain thiaminase, an enzyme that breaks down thiamine.[72]

Wild birds and fish

Thiamine deficiency has been identified as the cause of a paralytic disease affecting wild birds in the Baltic Sea area dating back to 1982.[73] In this condition, there is difficulty in keeping the wings folded along the side of the body when resting, loss of the ability to fly and voice, with eventual paralysis of the wings and legs and death. It affects primarily 0.5–1 kg sized birds such as the herring gull (Larus argentatus), common starling (Sturnus vulgaris) and common eider (Somateria mollissima). Researches noted, "Because the investigated species occupy a wide range of ecological niches and positions in the food web, we are open to the possibility that other animal classes may suffer from thiamine deficiency as well."[73]p. 12006

In the counties of Blekinge and Skåne (southernmost Sweden), mass deaths of several bird species, especially the European herring gull, have been observed since the early 2000s. More recently, species of other classes seems to be affected. High mortality of salmon (Salmo salar) in the river Mörrumsån is reported, and mammals such as the Eurasian Elk (Alces alces) have died in unusually high numbers. Lack of thiamine is the common denominator where analysis is done. In April 2012, the County Administrative Board of Blekinge found the situation so alarming that they asked the Swedish government to set up a closer investigation.[74]


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References

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