Methemoglobinemia - Wikipedi

  1. Methemoglobinemia is a condition of elevated methemoglobin in the blood. Symptoms may include headache, dizziness, shortness of breath, nausea, poor muscle coordination, and blue-colored skin (cyanosis). Complications may include seizures and heart arrhythmias.. Methemoglobinemia can be due to certain medications, chemicals, or food or it can be inherited from a person's parents
  2. WHAT IS METHEMOGLOBINEMIA? Methemoglobinemia is a condition characterized by increased quantities of hemoglobin in which the iron of heme is oxidized to the ferric (Fe 3+) form.Methemoglobin is useless as an oxygen carrier and thus causes a varying degree of cyanosis
  3. ution of the oxygen-carrying capacity of circulating hemoglobin occurs due to conversion of some or all of the four iron species from the reduced ferrous [Fe2+] state to the oxidized ferric [Fe3+] state. Ferric iron is unable to bind and transport oxygen. Increased levels of methemoglobin results in functional anemia

The diagnosis of methemoglobinemia should be considered in patients presenting with cyanosis and hypoxia. A variety of frequently used medications are capable of inducing methemoglobinemia, with dapsone and benzocaine being common culprits. Unique features, such as a saturation gap and chocolate-bro Methemoglobinemia is a blood disorder in which too little oxygen is delivered to your cells. Oxygen is carried through your bloodstream by hemoglobin, a protein that's attached to your red blood. Methemoglobinemia occurs when red blood cells (RBCs) contain methemoglobin at levels higher than 1%. This may be from congenital causes, increased synthesis, or decreased clearance. Increased levels may also result from exposure to toxins that acutely affect redox reactions, increasing methemoglobin levels

Methemoglobinemia can be congenital or acquired: The majority of people with congenital methemoglobinemia are asymptomatic except for cyanosis (only of cosmetic significance), but some forms may have serious morbidity. Acquired methemoglobinemia can be severe or even fatal, depending on the proportion of methemoglobin Methemoglobinemia types: Congenital - diminished enzymatic reduction of MetHb back to functional Hb. Affected patients appear cyanotic but are generally asymptomatic. Acquired - from specific drugs that cause oxidation of Hb to MetHb more rapidly than MetHb is reduced to Hb. Can be fatal. Drugs causing MetHb Methemoglobinemia is a blood condition where the patient has abnormal quantities of methemoglobin. Hemoglobin is the molecule that is present in the red blood cells and helps in distributing the oxygen all over the body; whereas, methemoglobin does not have the ability to release oxygen. Large amounts of nitric oxide are released in patients. Metahemoglobinemia. Es un trastorno sanguíneo en el cual se produce una cantidad anormal de metahemoglobina. La hemoglobina es la proteína en los glóbulos rojos que transporta y distribuye el oxígeno al cuerpo. La metahemoglobina es una forma de hemoglobina. Con la metahemoglobinemia, la hemoglobina puede transportar el oxígeno, pero es.

Methemoglobinemia to choroba krwi, która związana jest z powstaniem nieprawidłowej hemoglobiny, której cząsteczka hemu zawiera żelazo na +III stopniu utlenienia zamiast na +II.Powoduje to niezdolność do przyłączania tlenu, a więc także przenoszenia cząsteczek tlenu Methemoglobinemia typically causes the pulse oximeter to report a saturation of ~82-86% (even if the PaO2 is very high). In a hospital, this will be interpreted as refractory hypoxemia (saturation in 80s despite 100% FiO2). Patients will be treated with high-dose supplemental oxygen and the ICU may be consulted Methemoglobinemia is a rare cause of cyanosis in both adults and children. It arises from the production of dysfunctional hemoglobin containing oxidized Fe (3 +) which results in reduced oxygen supply to the tissues. The causes of methemoglobinemia may be categorized as either hereditary or acquired Methemoglobin (British: methaemoglobin) (pronounced met-hemoglobin) is a hemoglobin in the form of metalloprotein, in which the iron in the heme group is in the Fe 3+ state, not the Fe 2+ of normal hemoglobin.Sometimes, it is also referred to as ferrihemoglobin. Methemoglobin cannot bind oxygen, which means it cannot carry oxygen to tissues.It is bluish chocolate-brown in color

Methemoglobinémia je stav, pri ktorom je v krvi zvýšená hladina methemoglobínu.Methemoglobín je zoxidovaná forma hemoglobínu.Narozdiel od hemoglobínu nie je schopný prenášať kyslík, preto čím je vyššia koncentrácia methemoglobínu v krvi, tým menej kyslíku sú červené krvinky schopné preniesť. Pri vysokých koncentráciách methemoglobínu preto dochádza k. Animated Mnemonics (Picmonic): https://www.picmonic.com/viphookup/medicosis/ - With Picmonic, get your life back by studying less and remembering more. M.. Methemoglobinemia. Methemoglobinemia is the main systemic adverse effect that can occur following its use, and is a condition characterized by the inability of hemoglobin in red blood cells to carry oxygen to the tissues. From: Encyclopedia of Infant and Early Childhood Development, 2008. Download as PDF Methemoglobinemia is a potentially life-threatening health condition in which the oxygen-carrying capacity of circulating hemoglobin is significantly reduced. Image Credit: MicroOne/Shutterstock.com Acquired methemoglobinemia is rare, yet can still be seen in medical settings, and when an infant is exposed to nitrate in well water above 10 mg/L. To prevent exposure, parents should have their water tested for nitrate before the baby comes home. Physicians should make it practice to ask what the source of drinking water is for newly pregnant.

Metahemoglobinemia. La metahemoglobinemia es una enfermedad caracterizada por la presencia de un nivel anormalmente alto de metahemoglobina (Met-Hb) en la sangre. La metahemoglobina es una forma de hemoglobina que contiene la forma férrica del hierro [Fe3+]. La afinidad del hierro férrico por el oxígeno está alterada Methemoglobin (metHb; též hemiglobin nebo ferihemoglobin) je charakterizován přítomností trojmocného železa, které vzniká oxidací dvojmocného železa v hemoglobinu.Methemoglobin ztrácí schopnost reverzibilně vázat kyslík.Na jeho místě váže Fe III+ šestou koordinační vazbou molekulu vody. Barva methemoglobinu je čokoládově hnědá The key signs of methemoglobinemia are cyanosis and an oxygen saturation in the low to mid 80s. One of the key clues that you might be dealing with methemoglobinemia is an oxygen saturation in the 80s that does not improve with high flow supplemental oxygen. Another clue is the presence of cyanosis in a patient with an oxygen saturation in the. Gibsin GR, Hunter JB, Raabe DS, et al. Methemoglobinemia produced by high dose intravenous nitroglycerin. Ann Intern Med 1982; 96: 615-616. Hall AH, Kulig KW, Rumack BH. Drug-and chemical-induced methe moglobinemia: clinical features and management. Med Toxicol 1986; 1: 253

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The blue people of Troublesome Creek had methemoglobinemia, a metabolic condition affecting hemoglobin, the four-part protein that carries oxygen bound to an iron atom at each subunit's core. Like my recent post about the deaf community on Martha's Vineyard, it is a tale of an autosomal recessive disease that has dissipated over time as the. Methemoglobinemia, decrease in the oxygen-carrying capacity of red blood cells due to the presence of methemoglobin in the blood. Symptom severity is related to the quantity of methemoglobin in the circulation. Severe disease may be life-threatening. Learn about the symptoms, types, and treatment of methemoglobinemia

Methemoglobinemia is a blood disorder where there are elevated levels of methemoglobin in the blood. Methemoglobin is a form of hemoglobin that contains the iron Fe3. Hemoglobin is the protein in red blood cells that is responsible for transporting oxygen throughout the body, and raised levels of methemoglobin happen when the mechanisms that. Mise en garde médicale modifier - modifier le code - voir Wikidata (aide) La méthémoglobinémie est le taux de méthémoglobine dans le sang et par extension le nom de la maladie correspondant à un taux trop important de méthémoglobine dans le sang. Cette maladie ou intoxication est parfois dite « syndrome du bébé bleu » (Blue baby syndrome en anglais) quand elle touche le très. Methemoglobinemia (MetHb) is a blood disorder in which an abnormal amount of methemoglobin is produced and the body cannot reuse hemoglobin because it is damaged. Hemoglobin (Hb) is the protein in red blood cells that carries and distributes oxygen to the body. With methemoglobinemia, the hemoglobin can carry oxygen, but is not able to release. Methemoglobinemia a diagnosis that can cause blood to turn blueGood day. A bit more quite interesting and unusual news for you. Yes I know it sounds too incr.. Methemoglobinemia is a disorder of the blood that causes increased levels of an atypical form of hemoglobin that is unable to deliver oxygen to the body tissues efficiently.. In people affected by beta-globin type methemoglobinemia, the only symptom is cyanosis, which is a bluish discoloration of the skin, mucous membranes, or the area underneath the fingernails due to a lack of oxygen in the.

Methemoglobinemia occurs as iron in heme is oxidized to its ferric state, resulting in a decreased ability of hemoglobin to bind and release oxygen. Rasburicase is a recombinant urate-oxidase. Methemoglobinemia (congenital or acquired) occurs when red blood cells (RBCs) contain methemoglobin at levels higher than 1%. Methemoglobin results from the presence of iron in the ferric form. Methemoglobinemia, beta-globin type is a condition that affects the function of red blood cells. Specifically, it alters a molecule called hemoglobin within these cells. Hemoglobin within red blood cells attaches (binds) to oxygen molecules in the lungs , which it carries through the bloodstream, then releases in tissues throughout the body

Methemoglobinemia: Causes, Diagnosis, and Treatmen

Methemoglobinemia: Practice Essentials, Background

Methemoglobinemia is a potentially life-threatening form of functional anemia. There are two types of methemoglobinemia - congenital and acquired. In this episode I'll discuss the recognition and treatment of acquired methemoglobinemia. Use Up/Down Arrow keys to increase or decrease volume. 1 on Methemoglobinemia. Condition with life-threatening potential in which diminution of the oxygen-carrying capacity of circulating hemoglobin occurs due to conversion of some or all of the four iron species from the reduced ferrous [Fe 2+] state to the oxidized ferric [Fe 3+] state. Ferric iron is unable to bind and transport oxygen When there are elevated levels of methemoglobin in the blood, the condition is known as methemoglobinemia. This blood disorder can be acquired or congenital. Methemoglobin is a form of hemoglobin. When this disorder exists, hemoglobin can successfully carry oxygen but it cannot release it effectively to body tissues


CONCLUSIONS: Methemoglobinemia is a potentially severe disorder, whose diagnosis depends on a high degree of suspicion. In general, anesthesiologists are the first to detect the problem in the preoperative period and should lead the treatment Methemoglobinemia (met-hemo-globin-emia) is a condition where the quantity of methemoglobin in the red blood cells is higher than normal. It is a congenital condition, meaning that it is present from birth, but can develop in life due to exposure to certain toxins. Although methemoglobin is normally present in red blood cells, its quantity is.

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Description. Methemoglobinemia is a clinical condition in which more than 1% of hemoglobin is oxidized to methemoglobin, a type of hemoglobin that contains the ferric (Fe3+) form of iron. Patients with hemoglobin M are cyanotic but otherwise asymptomatic. If the mutation occurs in the hemoglobin alpha subunit (141800), cyanosis is apparent at. Background. Methemoglobinemia is a condition in which the iron within the hemoglobin is oxidized from the ferrous (Fe 2+) state to the ferric (Fe 3+) state, resulting in an inability to transport oxygen to the tissues.Acquired methemoglobinemia, more common than the congenital forms, occurs following exposure to a number of medications and oxidizing substances Prilocaine-Induced Methemoglobinemia -- Wisconsin, 1993 . Methemoglobinemia is an uncommon disorder in which hemoglobin is not oxidized and not capable of binding oxygen. This condition may be associated with exposure to nitrate-contaminated drinking water, aniline dyes, and amide-containing medications Description. Methemoglobinemia is a clinical condition in which more than 1% of hemoglobin is oxidized to methemoglobin, a type of hemoglobin that contains the ferric (Fe3+) form of iron. Patients with hemoglobin M are cyanotic but otherwise asymptomatic. If the mutation occurs in the hemoglobin alpha subunit, cyanosis is apparent at birth. A collection of disease information resources and questions answered by our Genetic and Rare Diseases Information Specialists for Methemoglobinemia, beta-globin typ

El Methemoglobinemia es una condición de salud potencialmente peligrosa para la vida en la cual la capacidad oxígeno-que lleva de circular la hemoglobina se reduce importante. Haber de imagen. There are numerous published case reports of dangerous methemoglobin levels caused by benzocaine and other local anesthetics.12,13Life-threatening methemoglobinemia has also been caused by the antibiotic dapsone14and by nitrates or nitrites.15The long list of drugs that produce toxic methemoglobin levels is summarized in table 3.16Symptoms of. Methemoglobinemia is an uncommon but potentially fatal disease in which normal methemoglobin in the blood increases to levels above 1%. Although it can be congenital, most cases are acquired due to exposure to certain chemicals, drugs, or toxins Methemoglobinemia generally manifests with few clinical signs other than cyanosis. Methemoglobin represents only 1% of the total hemoglobin of the healthy adult, although it can be slightly higher in preterm and term newborn infants. 19 Obvious cyanosis can occur with methemoglobin concentrations as low as 3% in infants with low hemoglobin. However, should methemoglobin formation be increased—e.g., due to the presence of oxidant drugs, or an abnormal methemoglobin not amenable to reduction (hemoglobin M), or a deficiency in red cell cytochrome b 5 reductase—methemoglobinemia will result. Most methemoglobinemias have no adverse clinical consequences and need not be treated


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  1. istration of 100% oxygen.
  2. Methemoglobinemia in Cats. The purpose of hemoglobin in the blood is to carry oxygen from the lungs to other parts of the body. Methemoglobin is the result of iron oxygenation, and while it is a form of hemoglobin, it does not carry oxygen
  3. Methemoglobinemia is a cause of central cyanosis that can be hereditary or acquired. Hereditary causes are rare and include deficiency of methemoglobin reductase or the presence of hemoglobin M. Acquired causes are due to oxidative stress, most commonly from local anesthetic agents, such as benzocaine. 1 Methemoglobinemia secondary to a topical.

Methemoglobinemia can occur as inherited, mainly due to genetic defects of cytochrome b5-reductase, or as acquired, due to insufficient cytochrome b5-reductase activity under induced oxidative stress. Inherited methemoglobinemia is rare and patient may present mildly cyanotic and asymptomatic Methemoglobinemia is an uncommon clinical problem in the newborn infant and when present is usually caused by environmental toxicity from strong oxidizing agents and only very rarely from an inherited disorder of hemoglobin metabolism. 2-5 Although an autosomal recessive form of methemoglobinemia was described in 1845, it is so rare that no. Methemoglobinemia is an uncommon but potentially life-threatening condition that can be caused by a variety of drugs at therapeutic or supratherapeutic doses. Avoidance or judicious use of high-risk drugs, having a high index of suspicion in high-risk patients, prompt discontinuation of offending agents, supportive care and treatment with. Methemoglobinemia (MetHb) is a blood disorder in which an abnormal amount of methemoglobin is produced and the body cannot reuse hemoglobin because it is damaged. Hemoglobin (Hb) is the protein in red blood cells that carries and distributes oxygen to the body. With methemoglobinemia, the hemoglobin can carry oxygen, but is not able to release.

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Metahemoglobinemia: MedlinePlus enciclopedia médic

Methemoglobinemia can be either congenital or acquired. Congenital methemoglobinemia results from a genetically determined deficiency in Two mechanisms result in cyanosis: systemic arterial oxygen desaturation and increased oxygen extraction by the tissues. Based upon these mechanisms, acquired methemoglobinemia, the erythrocytes are presented with an enormous exogenous oxidant load that simply overwhelms the protective cellular re-duction mechanisms. Conversely, in cases of congen-ital methemoglobinemia, cytochrome b5 reductase activity is diminished and there is a resultant de-crease in the rate of methemoglobin reduction. Th Methämoglobinämie. D74.-. Unter Methämoglobinämie versteht man in der Medizin eine erhöhte Konzentration von Methämoglobin (Met-Hb) im Blut. Das in den roten Blutkörperchen vorhandene Hämoglobin, das dem Sauerstofftransport dient, wird dabei in das funktionsunfähige Methämoglobin umgewandelt ( oxidiert, siehe Methämoglobin) und steht. Induction of methemoglobinemia (e.g., with amyl nitrite or sodium nitrite) is contraindicated in patients with inhalation injury unless concomitant carbon monoxide toxicity has been excluded because of the risk of worsening tissue hypoxia methemoglobinemia (blue baby syndrome). In infants less than six months old, a condition exists in their digestive systems which allows for the chemical reduction of nitrate to nitrite. The nitrite absorbs through the stomach and reacts with hemoglobin to form methemoglobin, which does not have the oxygen carrying capacity of hemoglobin

Methemoglobinemia - rodzaje, przyczyny, objawy i leczenie

We see methemoglobinemia regularly on our service, and the most common etiology in older children and adults is topical benzocaine. In all but a couple instances that I recall, when treating benzocaine-induced methemoglobinemia, a single IV injection of methylene blue at 2 mg/Kg (0.2 cc of 1% methylene blue OR 0.4 cc of 0.5% methylene blue per. metHb: A haemoglobin that results when oxyhaemoglobin in a ferrous (Fe2+) state is transformed into a ferric (Fe3+) state, which cannot transport O2. Low levels of methaemoglobin are always present in the circulation, but markedly increase after exposure to certain anaesthetics, benzocaines, nitrates, nitrites, phenacetin, etc., resulting in. Other articles where Methemoglobin is discussed: blood: Hemoglobin: state, hemoglobin is changed to methemoglobin, a brown pigment incapable of transporting oxygen. The red cells contain enzymes capable of maintaining the iron in its normal state, but under abnormal conditions large amounts of methemoglobin may appear in the blood

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Methemoglobinemia: etiology, pharmacology, and clinical management. Ann Emerg Med 1999;34:646-56. ABOUT THE AUTHORS Eashwar B. Chandrasekaran MD, MSc. Dr. Chandrasekaran is a clinical assistant professor of emergency medicine and palliative care at Indiana University School of Medicine Methodist Hospital.. The recommended first-line treatment of methemoglobinemia is intravenous administration of methylene blue, which reduces the heme group from methemoglobin to hemoglobin. Methylene blue is inexpensive, accessible and easy to administer. The initial dose is 1-2 mg/kg of body weight with repeated doses titrated against the clinical response

methemoglobinemia more than other local anaesthetics, the effect is due to metabolism prilocaine to an aniline like structure and to o-toluidine, both known methemoglobin inducers. The author, from the. Drugs methemoglobinemia. Methemoglobinemia Methemoglobinemia is a form of hemoglobinopathy, which is characterized by the presence of higher than normal level of methemoglobin. In methemoglobin it is the ferric form of iron, which is attached to globin instead of the ferrous form. Due to this modification hemoglobin has decreased ability to bind with oxygen whereas there is an increased. Methemoglobinemia (MetHb) is a blood disorder in which an abnormal amount of methemoglobin is produced. Hemoglobin is the protein in red blood cells (RBCs) that carries and distributes oxygen to the body There are a number of drugs that have been implicated in causing methemoglobinemia, with dapsone being on the list.1Treatment of methemoglobinemia involves removal of the causative agent and administration of methylene blue, which was done in this case. Methylene blue is an α-receptor agonist and works as a nitric oxide scavenger, both of which can result in hypertension

methemoglobinemia have been associated with upper airway or upper gastrointestinal procedures.5,6,16,19 Absorp - tion in these cases has occurred via the mucous mem-branes. Methemoglobinemia secondary to lidocaine exposure is a relatively rare complication. It has been de An inherited or acquired condition characterized by abnormally increased levels of methemoglobin in the blood. A condition in which a higher-than-normal amount of methemoglobin is found in the blood. Methemoglobin is a form of hemoglobin that cannot carry oxygen. In methemoglobinemia, tissues cannot get enough oxygen Signs and symptoms of methemoglobinemia may be delayed some hours after exposure. Initial signs and symptoms of methemoglobinemia are characterized by a slate grey cyanosis seen in e.g., buccal mucous membranes, lips, and nail beds. Advise patients to discontinue ACZONE Gel, 7.5% and seek immediate medical attention in the event of cyanosis Methemoglobinemia (MetHb) being a rare cause of cyanosis is generally not considered in its differential diagnosis. Methemoglobinemia is an abnormal Hb produced physiologically by auto-oxidation. If this process of auto oxidation is impaired either due to genetic defect or due to exogenous drugs/ toxins, its level starts rising. Once it is > 3%, tissue hypoxia ensues


Methemoglobinemia - an overview ScienceDirect Topic

This basic review is intended to summarize the current knowledge of methemoglobinemia as an important cause of secondary headache with the hope of generating a growing interest in studying this phenomenon. Background. We describe the pathological underpinnings of headaches generated by hypoxia. Possible mechanisms include cerebral vasodilation. Methemoglobinemia, tạm dịch: tăng methemoglobin huyết là một tình trạng gây ra bởi nồng độ methemoglobin trong máu tăng cao. Methemoglobin là một dạng của huyết sắc tố có chứa sắt Fe 3+. Ái lực với oxy đối với Fe 3+ bị suy yếu. Sự liên kết của oxy với methemoglobin dẫn đến sự gia tăng ái lực với oxy ở các vị trí. Acquired methemoglobinemia and hemolytic anemia after usual doses of phenazopyridine. Drug Intell Clin Pharm. 1982 Feb;16(2):157-9. ↑ Denshaw-Burke et al. Methemoglobinemia: Practice Essentials

Methemoglobinemia can present as a challenge for clinicians to both diagnose and treat in the intensive care unit and the operating room. Clinically, methemoglobinemia may manifest as dyspnea, nausea, cyanosis, and tachycardia to much more extreme symptoms such as lethargy, stupor, and deteriorating consciousness. Methemoglobinemia can be. Methemoglobinemia is a condition that some babies are born with (congenital) or some develop early in life (acquired). Acquired methemoglobinemia is more common than the congenital form. It can be caused by exposure to a variety of substances and by some health conditions. Blue Baby Syndrome 10 Methemoglobinemia can also be associated with intravascular hemolysis, which is another common cause of anemia. The same was ruled out in the index case by confirming a negative hemolytic work up (normal values for unconjugated bilirubin, haptoglobin, lactic acid dehydrogenase and glucose-6-phosphate dehydrogenase)..

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Methemoglobinemia is a rare cause of hypoxemia, characterized by abnormal levels of oxidized hemoglobin that cannot bind to and transport oxygen. A 62-year-old male underwent bronchoscopy where lidocaine oral solution and Hurricaine spray (20% benzocaine) were used. He developed central cyanosis and his oxygen saturation was 85% via pulse oximetry methemoglobinemia. However, phenazopyridine-induced methemoglobinemia is relatively rare with fewer than ten cases reported over the past 35 years [ 1-5]. We describe a case of phenazopyridine-induced methemoglobinemia that is unique for three reasons. First, the initial clinical presen-tation was suggestive of other, common causes of hypoxia

What is methemoglobinemia, beta-globin type? Share Your Story; Beta-globin type methemoglobinemia is an inherited blood disorder. It disrupts the function of hemoglobin, the molecule in red blood cells that delivers oxygen to cells throughout the body. Methemoglobinemia is characterized by increased levels of an atypical form of hemoglobin that is unable to deliver oxygen efficiently Methemoglobinemia Resulting from Work in an MDI Tank Webinar | AIHA. Course Description: Seemingly hardened, fully reacted 4,4 methylene diphenyl diisocyanate (MDI) solid waste material can form various hazardous exothermic compounds including aniline and p-toluidine. These compounds have skin designations and can cause exposure by penetrating. Methemoglobinemia definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Look it up now

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