Publications by authors named "Yoshimi Yoshitani"
Autonomic modulation of sinus and atrioventricular nodes in premature low-birth-weight infants.
Pacing Clin Electrophysiol
January 2005
Respiratory vagal activity is expressed by heart rate variability (HRV) at approximately 1 month of age in premature low-birth-weight infants (PLBWI). However, the autonomic inputs into the sinus node (SAN) and atrioventricular node (AVN) in PLBWI are unclear. We evaluated the variability in PP and PR intervals at day zero (day 0) and 1 month (1 month) after birth in 16 PLBWI (gestation 32.
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- - The study investigated how autonomic neural activity linked to respiration affects heart function in low birth weight infants, specifically looking at the spontaneous firing rate of the sinus (SA) node and atrioventricular (AV) conduction over the first month after birth.
- - Researchers studied the relationship between variations in PR (AV conduction time) and PP (SA node firing cycle) intervals, determining that while PP decreased with growth, PR increased, indicating maturation of the autonomic nervous system.
- - High-speed frequency analysis revealed opposing changes in low-frequency to high-frequency ratios for PP and PR, suggesting enhanced vagal nerve activity influences AV conduction as infants develop, though no significant correlation changes were noted between the SA and AV functions.