xanthine

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xan·thine

 (zăn′thēn′, -thĭn)
n.
1. A yellowish-white, crystalline purine base, C5H4N4O2, that is a precursor of uric acid and is found in blood, urine, muscle tissue, and certain plants.
2. Any of several derivatives of this compound.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

xanthine

(ˈzænθiːn; -θaɪn)
n
1. (Elements & Compounds) a crystalline compound related in structure to uric acid and found in urine, blood, certain plants, and certain animal tissues. Formula: C5H4N4O2
2. (Elements & Compounds) any substituted derivative of xanthine, esp one of the three pharmacologically active methylated xanthines, caffeine, theophylline, or theobromine, which act as stimulants and diuretics
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

xan•thine

(ˈzæn θin, -θɪn)

n.
1. a crystalline, nitrogenous compound, C5H4N4O2, related to uric acid, occurring in urine, blood, and certain animal and vegetable tissues.
2. any derivative of this compound.
[1855–60; < French; see xantho-, -ine2]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.xanthine - crystalline oxidation product of the metabolism of nucleoproteins; precursor of uric acid; found in many organs and in urine
organic compound - any compound of carbon and another element or a radical
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
xantin
Xanthin
xanthine

xan·thine

n. xantina, grupo de substancias tales como la cafeína estimulantes del sistema nervioso central y del corazón.
English-Spanish Medical Dictionary © Farlex 2012
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Xanthines are "side door bronchodilators" because we do not know how they actually work.
Xanthines: the side door bronchodilators
A study of 747 patients hospitalized for asthma and 464 treated in emergency rooms found that 28% in either group had previously used long-term asthma controller medications such as corticosteroids, xanthines, leukotriene modifiers, or combination medications.
Patients not filling asthma prescriptions: low rates of controller medication use. (Clinical Rounds)
Because of tautomerism (hydrogen shifts within the molecule), xanthines such as caffeine appear to have phenolic structure, but the preferred chemical structure in xanthines is the ketone."
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Although the 1% rate may nor seem that high, fatality in persistent pulmonary hypertension of the newborn (PPHN) is about 40%-50%, even with treatment with xanthines and/or nitric oxide, study investigator Dr.
Cesarean Linked to Persistent Pulmonary HT

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