Methemoglobinemia (or methaemoglobinaemia) is a disorder characterized by the presence of a higher than normal level of methemoglobin (metHb, i.e., ferric [Fe3+] rather than ferrous [Fe2+] haemoglobin) in the blood. Methemoglobin is a form of hemoglobin that contains ferric [Fe3+] iron and has a decreased ability to bind oxygen. However, the ferri...
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http://en.wikipedia.org/wiki/Methemoglobinemia
decrease in the oxygen-carrying capacity of the red blood cells (erythrocytes) due to the presence of methemoglobin in the blood. The severity of the ... [1 related articles]
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http://www.britannica.com/eb/a-z/m/80
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. Symptoms may include headache, dizziness, fatigue, shortness of breath, nausea, vomiting, rapid heartbeat, loss of muscle coordination, and b...
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http://www.cancer.gov/dictionary?expand=M
(met″he-mo-glo″bĭ-ne´me-ә) the presence of excessive methemoglobin in the blood, resulting in cyanosis and headache, dizziness, fatigue, ataxia, dyspnea, tachycardia, nausea, vomiting, and drowsiness, which can progress to stupor, coma, and occasionally death. It may be either chemical- or drug-in...
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Type: Term Pronunciation: met-hē′mō-glō′bi-nē′mē-ă Definitions: 1. The presence of methemoglobin in the circulating blood; when severe, there is inadequate oxygenation of the tissues. Methemoglobin causes the blood to have a brownish color, which may be mistaken for cyanosis.
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http://www.medilexicon.com/medicaldictionary.php?t=54737
Methemoglobinemia: The presence in the blood of methemoglobin, a form of hemoglobin that is useless for carrying oxygen and delivering it to tissues throughout the human body. Since hemoglobin is the key carrier of oxygen in the blood, its replacement by methemoglobin can cause cyanosis (a slate gray-blueness) due to lack of oxygen. A small amount ...
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