- 1. Usually the result of the repeated pairing of a normal sinus beat with a ventricular extrasystole. 2. See c. phase. 3. A condition in which one or more products of a reaction are the subsequent reactants (or substrates) of a second reaction.- constant c. SYN: fixed c..- fixed c. where several premature beats are seen, the interval between each of them and the preceding normal beat is constant. SYN: constant c..- variable c. where several extrasystoles are seen, the interval between each of them and the preceding sinus beat varies.
* * *cou·pling 'kəp-liŋ, -ə-liŋ n1) the joint together with its supporting structures between the last lumbar vertebra and the sacrum that joins the hindquarters of a quadruped to the trunk broadly the part of the body or the conformation and proportionate length of the part of the body that joins the hindquarters to the forequarters2) the tendency of linked traits to be inherited together in offspring of a double heterozygote when both dominant genes occur on one chromosome and both recessive genes occur on the homologous chromosome compare REPULSION3) BIGEMINY
* * *coup·ling (kupґling) 1. the joining together of two things. 2. in genetics, the occurrence on the same chromosome in a double heterozygote of the two mutant alleles of interest. Cf. repulsion. 3. in cardiology, the serial occurrence of a normal heart beat followed closely by a premature beat.
Medical dictionary. 2011.