| ritanserin | <chemical> A selective and potent serotonin-2 antagonist that is effective in the treatment of a variety of syndromes related to anxiety and depression. The drug also improves the subjective quality of sleep and decreases portal pressure. Pharmacological action: anti-anxiety agents, antidepressive agents, second-generation, antipsychotic agents, serotonin antagonists. Chemical name: 5H-Thiazolo(3,2-a)pyrimidin-5-one, 6-(2-(4-(bis(4-fluorophenyl)methylene)-1-piperidinyl)ethyl)-7-methyl- (12 Dec 1998) |
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| Ritgen's manoeuvre | Delivery of a child's head by pressure on the perineum while controlling the speed of delivery by pressure with the other hand on the head. (05 Mar 2000) |
| Ritgen, Ferdinand August Marie Franz von | <person> German obstetrician, 1787-1867. See: Ritgen's manoeuvre. (05 Mar 2000) |
| ritodrine | <chemical> Adrenergic beta-agonist used to control premature labour. Pharmacological action: adrenergic beta-agonists, sympathomimetic, tocolytic agents. Chemical name: Benzenemethanol, 4-hydroxy-alpha-(1-((2-(4-hydroxyphenyl)ethyl)amino)ethyl)-, (R*,S*)- (12 Dec 1998) |
| ritonavir | <drug> A protease inhibitor under development by Abbott Laboratories. It has produced drops in HIV viral load of greater than 99 percent in some people. (23 Aug 1998) |
| Rittenhouse-Manogian procedure | Enlarges the aortic annulus by incising the left coronary-noncoronary commissure down unto the anterior leaflet of the mitral valve. (05 Mar 2000) |
| ritter disease | This is the scalded skin syndrome, a potentially serious side effect of infection with the staph (staphylococcus) bacteria that produces a specific protein which loosens the cement holding the various layers of the skin together. This allows blister formation and sloughing of the top layer of skin. If it occurs over large body regions it can be deadly (just like a large surface area of the body having been burned). It is necessary to treat scalded skin syndrome with intravenous antibiotics and to protect the skin from allowing dehydration to occur if large areas peel off. The disease occurs predominantly in children under 5 years of age. It is known formally as staphyloccoccal scalded skin syndrome. (12 Dec 1998) |
| Ritter's law | A nerve is stimulated at both the opening and the closing of an electrical current. See: law of polar excitation. (05 Mar 2000) |
| Ritter's opening tetanus | The tetanic contraction that occasionally occurs when a strong current, passing through a long stretch of nerve, is suddenly interrupted. (05 Mar 2000) |
| Ritter, Johann | <person> German physicist, 1776-1810. See: Ritter's law, Ritter's opening tetanus, Ritter-Rollet phenomenon. (05 Mar 2000) |
| Ritter-Rollet phenomenon | On equal electrical stimulation of motor nerve trunks, the flexor and abductor muscle groups react more readily than the extensors and adductors. (05 Mar 2000) |
| ritual | In psychiatry and psychology, any psychomotor activity (e.g., morbid handwashing) sustained by an individual to relieve anxiety or forestall its development; typically seen in obsessive-compulsive neurosis. Origin: L. Ritualis, fr. Ritus, rite (05 Mar 2000) |
| ritualistic behaviour | Automatic behaviour of psychogenic or cultural origin. (05 Mar 2000) |