| 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) |
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| 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) |
| red cell adherence phenomenon | A phenomenon manifested by the adherence of antigen-antibody-complement complex to "indicator cells" (microorganisms, platelets, leukocytes, or erythrocytes), the reaction being sensitive and specific for the antigen and antibody in the complex. Synonym: erythrocyte adherence phenomenon, immune adherence phenomenon, red cell adherence phenomenon. (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) |
| Grasset's 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) |
| peroneal phenomenon | Tapping the peroneal nerve below the head of the fibula causes dorsiflexion and abduction of the foot. (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) |
| Pfeiffer's phenomenon | The alteration and complete disintegration of cholera vibrios when introduced into the peritoneal cavity of an immunised guinea pig, or into that of a normal one if immune serum is injected at the same time; extended to include bacteriolysis in general. (05 Mar 2000) |
| 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) |