| TWA | T wave alternans |
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| discordant alternans | Presence of right ventricular and pulmonary artery alternans with peripheral pulsus alternans, but with the strong beat of the right ventricle coinciding with the weak beat of the left and vice versa. (05 Mar 2000) |
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| discordant | 1. Disagreeing; incongruous; being at variance; clashing; opposing; not harmonious. "The discordant elements out of which the emperor had compounded his realm did not coalesce." (Motley) 2. [See Discord. 2. Dissonant; not in harmony or musical concord; harsh; jarring; as, discordant notes or sounds. "For still their music seemed to start Discordant echoes in each heart." (Longfellow) 3. <geology> Said of strata which lack conformity in direction of bedding, either as in unconformability, or as caused by a fault. Synonym: Disagreeing, incongruous, contradictory, repugnant, opposite, contrary, inconsistent, dissonant, harsh, jarring, irreconcilable. Discord"antly, Discord"antness. Origin: OE. Discordant, descordaunt, OF. Descordant, discordant, F. Discordant, p. Pr. Of discorder, OF. Also, descorder. See Discord. Source: Websters Dictionary (01 Mar 1998) |
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| discordant alternation | The alternation in cardiac activities of either the systemic or the pulmonary circulations, but not of both, or in both but oppositely directed in each. (05 Mar 2000) |
| discordant atrioventricular connections | Connections in which each atrium is connected with a morphologically inappropriate ventricle. (05 Mar 2000) |
| discordant thyroid nodule | <radiology> Hot on Tc-99m pertechnetate, cold on I-123 or I-131, indicates trapping, but no organification, same work-up as cold nodule (12 Dec 1998) |
| alternans | Alternating; KP7>often used substantively for alternation of the heart, either electrical or mechanical. Alternating; used as a noun in the sense of pulsus alternans. Origin: L. (05 Mar 2000) |
| auditory alternans | Alternation in the intensity of heart sounds or murmurs in the presence of a regular cardiac rhythm as a result of alternation of the heart. Synonym: auditory alternans. (05 Mar 2000) |
| auscultatory alternans | Alternation in the intensity of heart sounds or murmurs in the presence of a regular cardiac rhythm as a result of alternation of the heart. Synonym: auditory alternans. (05 Mar 2000) |
| concordant alternans | Simultaneous occurrence of right ventricular and pulmonary artery alternans with left ventricular and peripheral pulsus alternans. (05 Mar 2000) |
| pulsus alternans | Mechanical alternation, a pulse regular in time but with alternate beats stronger and weaker, often detectable only with the sphygmomanometer and usually indicating serious myocardial disease. Synonym: pulsus alternans. (05 Mar 2000) |
| systole alternans | <physiology> Contraction of only one ventricle of the heart. Hemisystole is noticed in rare cases of insufficiency of the mitral valve, in which both ventricles at times contract simultaneously, as in a normal heart, this condition alternating with contraction of the right ventricle alone; hence, intermittent hemisystole. Source: Websters Dictionary (01 Mar 1998) |
| electrical alternans | Electrical alternation of the heart. (05 Mar 2000) |
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