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Topic: Digitalis

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	Facts about topic: (Digitalis) (Site not responding. Last check: 2007-10-20)
		The dependence on the vagal effect means that digitalis is not effective when a patient has a high sympathetic nervous system (Originates in the thoracic regions of the spinal cord; opposes physiological effects of the parasympathetic: reduces digestive secretions; speeds the heart; contracts blood vessels) drive, which is the case with acutely ill persons.
		Digitalis is a classic example of a drug derived from a plant formerly used by folklorists and herbalists: herbalists have largely abandoned its use because of its narrow therapeutic index (additional info and facts about therapeutic index) and the difficulty of determining the amount of active drug in herbal preparations.
		Once the usefulness of digitalis in regulating pulse was understood, it was employed for a variety of purposes, including the treatment of epilepsy (A disorder of the central nervous system characterized by loss of consciousness and convulsions) and other seizure disorders, now considered inappropriate.
	www.absoluteastronomy.com /encyclopedia/d/di/digitalis.htm (567 words)

	MedlinePlus Medical Encyclopedia: Digitalis toxicity
		Digitalis toxicity is a complication of digitalis therapy, or it may be caused by an acute ingestion of digitalis.
		Digitalis toxicity can be caused by high levels of digitalis in the body, or a decreased tolerance to the drug.
		Digitalis toxicity can occur from a single exposure or chronic overmedication, or it may occur in patients with normal blood levels of digitalis if other risks are present.
	www.nlm.nih.gov /medlineplus/ency/article/000165.htm (586 words)

	digitalis. The Columbia Encyclopedia, Sixth Edition. 2001-05
		Chemically, digitalis is composed of a sugar (glycoside), a steroid, and a cyclic ester known as a lactone; the pharmacological activity varies according to differences, occurring naturally or introduced synthetically, in the steroid or sugar portions.
		Common preparations include digitalis, digitoxin, and digoxin, all from foxglove, and ouabain from Strophanthus gratus, the ouabaio tree; these vary both in solubility and in rapidity and duration of effect.
		Digitalis slows the pulse and slows the conduction of nerve impulses in the heart.
	www.bartleby.com /65/di/digitali.html (276 words)

	digitalis on Encyclopedia.com
		The effects of the drug were known as early as 1500 BC; it was later obtained from the foxglove plant, Digitalis purpurea, and from fuchsia (see figwort).
		Digitalis for treatment of congestive heart failure in patients in sinus rhythm.(Cochrane For Clinicians: Putting Evidence Into Practice)
		Keeping a finger on the pulse; ARCHIVE Digitalis purpurea gave one city doctor a hearty reputation, reveals Chris Upton.
	www.encyclopedia.com /html/d1/digitali.asp (446 words)

	definition of digitalis
		The dried leaves of the purple foxglove (Digitalis purpurea), used in heart disease, disturbance of the circulation, etc.
		Circulation, Digitalis, Disease, Disturbance, Dried, Foxglove, Genus, Heart, In, Including, Leaves, Of, Purple, The, Used
		Circulation, Digitalis, Disease, Disturbance, Dried, Etc, Foxglove, Genus, Heart, In, Including, Leaves, Of, Plants, Purple, The, Used
	www.brainydictionary.com /words/di/digitalis154287.html (75 words)

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