| nodal bradycardia | The cardiac rhythm when the heart is controlled by the A-V junction (including node); arising in the A-V junction, the impulse ascends to the atria and descends to the ventricles, each at varying speeds depending on site of the pacemaker. Synonym: A-V junctional rhythm, nodal bradycardia, nodal rhythm. (05 Mar 2000) |
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| nodal fever | <dermatology> A disorder characterised by the formation of tender, red nodules on the front of the legs. Erythema nodosum primarily affects women and has been associated with certain infections: coccidiomycosis, fungal infections, tuberculosis, hepatitis B and syphilis. A sensitivity to a particular drug (for example penicillin, progestin, birth control pills) may also manifest this disorder. Other disorders and conditions that have been associated with erythema nodosum include: leukaemia, sarcoidosis, rheumatic fever, ulcerative colitis and pregnancy. (27 Sep 1997) |
| nodal plane | The plane corresponding to the optical centre of a simple lens. See: nodal point. (05 Mar 2000) |
| nodal point | One of two point's in a compound optical system so related that a ray directed toward the first point will appear to have passed through the second point parallel to its original direction. Synonym: axial point. (05 Mar 2000) |
| nodal rhythm | The cardiac rhythm when the heart is controlled by the A-V junction (including node); arising in the A-V junction, the impulse ascends to the atria and descends to the ventricles, each at varying speeds depending on site of the pacemaker. Synonym: A-V junctional rhythm, nodal bradycardia, nodal rhythm. (05 Mar 2000) |
| nodal tachycardia | Tachycardia originating in the A-V junction. Synonym: A-V junctional tachycardia, nodal tachycardia. (05 Mar 2000) |
| nodal tissue | See: atrioventricular node, sinuatrial node. (05 Mar 2000) |
| tachycardia, atrioventricular nodal reentry | A tachycardia characterised by rates between 150 and 250 beats per minute and a qrs complex of supraventricular origin. (12 Dec 1998) |
| tachycardia, sinoatrial nodal reentry | A tachycardia arising from the sinus node region and characterised by rates between 115 and 140 beats per minute. It is paroxysmal rather than constant. (12 Dec 1998) |
| upper nodal extrasystole | An obsolete term for a nodal extrasystole supposed to arise from the upper part of the A-V node; recognised in the electrocardiogram by a retrograde P wave preceding the QRS complex by an abnormally short P-R interval. (05 Mar 2000) |
| lower nodal extrasystole | An obsolete term for a nodal extrasystole supposed to arise from the lower part of the A-V node, recognised in the electrocardiogram by the retrograde P wave that follows the QRS complex. (05 Mar 2000) |
| adult T-cell lymphoma | <tumour> An acute or subacute disease associated with a human T-cell virus, with lymphadenopathy, hepatosplenomegaly, skin lesions, peripheral blood involvement, and hypercalcaemia. Synonym: adult T-cell leukaemia. (05 Mar 2000) |
| anaplastic large cell lymphoma | <tumour> A form of lymphoma characterised by anaplasia of cells, sinusoidal growth, and immunoreactivity with CD30 (Ki-1 or Ber-H2). Synonym: Ki-1+ lymphoma. (05 Mar 2000) |
| benign lymphoma of the rectum | A rectal polyp composed of lymphoid tissue with follicle formation, covered by mucosa. (05 Mar 2000) |
| burkitt lymphoma | A form of undifferentiated malignant lymphoma usually found in central africa, but also reported in other parts of the world. It is commonly manifested as a large osteolytic lesion in the jaw or as an abdominal mass. B-cell antigens are expressed on the immature cells that make up the tumour in virtually all cases of burkitt lymphoma. The epstein-barr virus (herpes virus 4, human) has been isolated from burkitt lymphoma cases in africa and it is implicated as the causative agent in these cases; however, most non-african cases are ebv-negative. (12 Dec 1998) |