In 1-week-old rabbits, those with inducible atrioventricular nodal re-entry demonstrated a shorter AH minimum compared with the non-re-entry group (39.0 vs. 61.0, P=0.017).
Does age affect the inducibility of atrioventricular nodal re-entry and AV nodal functional properties in a rabbit model?
Both 2-month-old and 6-month-old rabbits represent stable models for studying atrioventricular nodal re-entry, with longer AH conduction time leading to greater re-entry inducibility.
Tasa de eventos absoluta: 39% vs 61%
valor p: p=0.017
AIMS: Many issues regarding atrioventricular nodal re-entry (AVNR) remain unexplored; however, no stable animal model for the study of AVNR has yet been developed. Clinically, AVNR is found more commonly in adults than children. We attempt to characterize AV nodal functional properties and inducibility of AVNRT using rabbits of three different age groups since we hypothesize that the inducibility of AVNR may increase as the subject ages. METHODS AND RESULTS: We evaluated the inducibility of AVNR and the functional characteristics of the AV node in 6-month-old (Group 1), 2-month-old (Group 2), and at 1-week-old (Group 3) rabbits using a well-established rabbit heart model. We found that the inducibility of AVNR was higher in the 2-month-old group, compared with the 1-week-old group (30%). There was no functional difference between the two older groups (6-month-old and 2-month-old groups), however the youngest group (Group 3) showed better AV nodal functional properties. Regarding the correlation between inducibility and nodal functional properties, subgroups with AVNR demonstrated a longer AH maximum (AHmax) compared with the non-re-entry group, although there is no difference in age-adjusted AHmax. Regarding the correlation between inducibility and nodal functional properties, for the 1-week-old rabbits, subgroups with AVNR demonstrated a shorter AH minimum compared with the non-re-entry group (39.0 vs. 61.0, P=0.017). CONCLUSION: Our results demonstrate that both 2-month-old and 6-month-old rabbits represent stable models for AVNR. Longer AH conduction time may lead to greater re-entry inducibility.
Wang et al. (2010) studied Atrioventricular nodal re-entry (AVNR). Age (6-month, 2-month, and 1-week-old) vs. Between age groups was evaluated on AH minimum in 1-week-old rabbits (AVNR vs non-re-entry) (p=0.017). In 1-week-old rabbits, those with inducible atrioventricular nodal re-entry demonstrated a shorter AH minimum compared with the non-re-entry group (39.0 vs. 61.0, P=0.017).