| discordant atrioventricular connections | Connections in which each atrium is connected with a morphologically inappropriate ventricle. (05 Mar 2000) |
|---|---|
| diurnal rhythm | Occurring during the day. (18 Nov 1997) |
| double inlet atrioventricular connections | Connections in which both atrial chambers connect to the same ventricle. (05 Mar 2000) |
| idiojunctional rhythm | An independent rhythm, the ventricles being under control of the A-V node (A-V junction). Synonym: idiojunctional rhythm. (05 Mar 2000) |
| idionodal rhythm | An independent rhythm, the ventricles being under control of the A-V node (A-V junction). Synonym: idiojunctional rhythm. (05 Mar 2000) |
| idioventricular rhythm | A slow independent ventricular rhythm under control of a ventricular centre (which is, by definition, ectopic). Synonym: ventricular rhythm. (05 Mar 2000) |
| incomplete atrioventricular block | Impulses penetrate the atrioventricular junction in some relation to the ventricular rate. Synonym: incomplete atrioventricular block. (05 Mar 2000) |
| incomplete atrioventricular dissociation | A-V dissociation interrupted by ventricular captures. (05 Mar 2000) |
| quadrigeminal rhythm | A cardiac arrhythmia in which the heartbeats are grouped in fours, each usually composed of one sinus beat followed by three extrasystoles, but a repetitive group of four of any composition is quadrigeminal. Synonym: quadrigeminy. (05 Mar 2000) |
| quadruple rhythm | A quadruple cadence to the heart sounds due to the easy audibility of both third and fourth heart sounds, indicative of serious myocardial disease. Synonym: trainwheel rhythm. (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) |
| theta rhythm | Brain waves in the electroencephalogram which have a frequency of 4 to 7 per second. They occur mainly in children but also in adults during periods of emotional stress. (12 Dec 1998) |
| ectopic rhythm | Any cardiac rhythm arising from a centre other than the normal pacemaker, the sinus node. (05 Mar 2000) |
| tic-tac rhythm | A condition in which the cadence of the heart sounds resembles that of the foetus, the first and second sounds becoming alike and evenly spaced; a sign of serious myocardial disease. Synonym: pendulum rhythm, tic-tac rhythm, tic-tac sounds. Origin: embryo-+ G. Kardia, heart (05 Mar 2000) |
| trainwheel rhythm | A quadruple cadence to the heart sounds due to the easy audibility of both third and fourth heart sounds, indicative of serious myocardial disease. Synonym: trainwheel rhythm. (05 Mar 2000) |