Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «R»:
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Rickettsioses
Rickettsioses: The infectious diseases caused by the
rickettsiae. See Rickettsial diseases....
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Rickettsioses of the eastern hemisphere, tick-born
Rickettsioses of the eastern hemisphere, tick-borne:
There are 3 known diseases caused by infection with rickettsial agents. They are North
Asian tick-borne rickettsiosis, Queensland tick typhus, and African tick typhus (fievre
boutonneuse)....
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Rickettsiosis, North Asian tick-borne
Rickettsiosis, North Asian tick-borne: One of the
tick-borne rickettsial diseases of the eastern hemisphere, similar to Rocky Mountain
spotted fever, but less severe, with fever, a small ulcer (eschar) at the site of the tick
bite, swollen glands nearby (satellite lymphadenopathy), and a red raised ...
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Rickettsiosis, vesicular
Rickettsiosis, vesicular: See Rickettsialpox....
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Rift Valley fever
Rift Valley fever: A viral disease that is acute, causes fever in domestic animals (such as cattle, buffalo, sheep, goats, and camels) and humans, and is associated with mosquito-borne epidemics during years of heavy rainfall. Rift Valley fever is more deadly than West Nile virus.
Rift Valley fever...
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Right atrium
Right atrium: The right upper chamber of the heart. The right atrium receives deoxygenated blood from the body through the vena cava and pumps it into the right ventricle which then sends it to the lungs to be oxygenated....
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Right heart
Right heart: The heart is
composed functionally of two hearts - the right heart and the
left heart. The right heart consists of the right atrium
which receives deoxygenated blood from the body and the
right ventricle which pumps it to the lungs. The right
heart is a low pressure system....
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Right hepatic duct
Right hepatic duct: The duct that drains bile from the right half of the liver and joins the left hepatic duct to form the common hepatic duct....
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Right ventricle
Right ventricle: The lower right chamber of the heart that receives deoxygenated blood from the right atrium and pumps it under low pressure into the lungs via the pulmonary artery.
The tricuspid valve is located between the right atrium and right ventricle and ensures the flow of blood from the rig...
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Right-handed
Right-handed: The preferential use of the right hand for most fine manual tasks. Approximately 90% of the population is right-handed. In French, the word for right is droit and the word for left is gauche meaning clumsy or awkward. In Latin the word for right is dexter (as in dexterity) and the wor...
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Rigor
Rigor: A word with two different but related meanings in medicine:
1. A chill, usually with shivering, as at the onset of high fever and chills.
2. Rigidity, as in rigor mortis, the rigidity of a body after death.
The alternate spelling rigour is chiefly British. From the French, from the Latin rigo...
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Rigor mortis
Rigor mortis: Literally, the stiffness of death. The rigidity of a body after death. Rigor mortis is a good example of a Latin term (one in this case that was coined in the 19th century) remaining intact in contemporary medical usage (and crime writing).
Rigor mortis is due to a biochemical chang...
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Rigour
Rigour: See: Rigor....
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Riley-Day syndrome
Riley-Day syndrome: Eponym for familial dysautonomia. See: Familial dysautonomia. ...
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Ring chromosome
Ring chromosome:
A structurally abnormal chromosome in which the end of each chromosome arm has been lost and the broken arms have been reunited in ring formation. A ring chromosome is denoted by the symbol r....
