| gap phenomenon | A short period in the cycle of the atrioventricular or intraventricular conduction allowing passage of an impulse which at other times would be blocked in transit. Synonym: excitable gap. (05 Mar 2000) |
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| Gartner's vein phenomenon | Fullness of the veins of the arm and hand held below heart level and collapse at a certain variable distance above that level. (05 Mar 2000) |
| paradoxical diaphragm phenomenon | In pyopneumothorax, hydropneumothorax, and some cases of injury, the diaphragm on the affected side rises during inspiration and falls during expiration. (05 Mar 2000) |
| paradoxical pupillary phenomenon | A pupillary response to light, the reverse of that expected; e.g., contraction of the pupil in response to turning the lights off. Synonym: Flynn phenomenon, paradoxical pupillary phenomenon. (05 Mar 2000) |
| generalised Shwartzman phenomenon | When both the primary injection of endotoxin-containing filtrate and the secondary injection are given intravenously 24 hours apart, the animal usually dies within 24 hours after the second inoculation; the characteristic lesions in the rabbit include widespread haemorrhages in the lung, liver, and other organs and bilateral cortical necrosis of the kidney. This reaction has no immunological basis. Synonym: Sanarelli phenomenon, Sanarelli-Shwartzman phenomenon. (05 Mar 2000) |
| Raynaud's phenomenon | <clinical sign, dermatology> (Maurice Raynaud, French physician, 1834-1881) intermittent bilateral attacks of ischaemia of the fingers or toes and sometimes of the ears or nose, marked by severe pallor and often accompanied by paraesthesia and pain, it is brought on characteristically by cold or emotional stimuli and relieved by heat and is due to an underlying disease or anatomical abnormality. When the condition is idiopathic or primary it is termed Raynaud's disease. (18 Nov 1997) |
| rebound phenomenon | Generally, any phenomenon in which a variable that has been displaced from its normal state by a disturbing influence temporarily deviates from normal in the opposite direction when the disturbing influence is suddenly removed, before finally stabilizing at its normal state, i.e., a phenomenon involving undershoot; e.g., the subsequent hypoglycaemia that may follow injection of glucose, because the initial hyperglycaemia caused excessive secretion of insulin. Synonym: Stewart-Holmes sign (05 Mar 2000) |
| Marcus Gunn phenomenon | <syndrome> An increase in the width of the eye lids during chewing, sometimes with a rhythmic elevation of the upper lid when the mouth is open and ptosis when the mouth is closed. Synonym: Gunn phenomenon, Gunn's syndrome, jaw-winking phenomenon, jaw-working reflex, Marcus Gunn phenomenon, Marcus Gunn syndrome. (05 Mar 2000) |
| Gengou phenomenon | An extension of the Bordet-Gengou phenomenon; noncellular antigens, when mixed with specific antibody, also fix alexin (complement). (05 Mar 2000) |
| reclotting phenomenon | The property of certain gels of becoming less viscous when shaken or subjected to shearing forces and returning to the original viscosity upon standing (e.g., synovial fluid, ferrous hydroxide gel); a characteristic of a system exhibiting a decrease in viscosity with an increase in the rate of shear, usually a function of time. Synonym: reclotting phenomenon. Origin: G. Thixis, a touching, + trope, turning (05 Mar 2000) |
| release phenomenon | The increased tonus and hyperirritability of muscle-stretch reflexes which occur following damage of the upper portions of the extrapyramidal system. (05 Mar 2000) |
| Glover phenomenon | Nonrandom (i.e., haphazard) variation among communities in rates of performing common elective procedures, such as tonsillectomy, hysterectomy, attributable to local variations in medical and surgical practices. (05 Mar 2000) |
| Goldblatt phenomenon | Increased blood pressure following obstruction of blood flow to one kidney. Synonym: Goldblatt phenomenon. (05 Mar 2000) |
| cervicolumbar phenomenon | A sense of weakness in the lower extremities on movement of the neck when a lesion is present in the upper portion of the spinal cord; or sensations referred to the neck when a lesion exists in the lower portion of the cord. (05 Mar 2000) |
| Grasset-Gaussel phenomenon | In organic paralysis of the lower extremity, the patient, lying on his back, can raise either limb separately, but not both together. Synonym: Grasset-Gaussel phenomenon. (05 Mar 2000) |