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Published on: August 25, 2014
Aminophylline-associated irritable behaviour in preterm neonates
Tomoki Maeda1, Masanori Inoue1, Kazuhito Sekiguchi1
1Department of Pediatrics and Child Neurology, Oita University Faculty of Medicine, Oita, Japan.
Insights
Aminophylline administration in preterm infants was linked to temporary irritable behavior but did not affect autonomic function. This study monitored general movements and autonomic parameters during the preterm period.
Area of Science:
- Neonatal Medicine
- Developmental Pediatrics
- Pharmacology
Background:
- Preterm infants often experience behavioral and autonomic challenges.
- Aminophylline is used to manage conditions like apnea in neonates.
- Understanding aminophylline's impact on preterm infant development is crucial.
Purpose of the Study:
- To investigate the effects of aminophylline on behavior and autonomic function in preterm infants.
- To assess changes in general movements (GM) optimality and autonomic parameters.
- To compare outcomes at different gestational age periods.
Main Methods:
- Study included preterm infants receiving aminophylline (Am+) and a control group (Am-).
- Behavior assessed using general movement optimality (onset-offset, tremulous movements).
- Autonomic function evaluated via heart rate and heart rate variability analysis.
Main Results:
- The aminophylline group showed significantly lower optimality of tremulous movements at 32-33 weeks gestation.
- No significant differences in autonomic parameters were observed between the groups.
- No correlation found between GM optimality scores and serum theophylline concentration.
Conclusions:
- Aminophylline administration is associated with transient irritable behavior in preterm infants.
- No significant impact on autonomic function was detected during the preterm period.
- Further research may explore long-term behavioral effects.
Aim:
This study investigated the effect of aminophylline on behaviour and autonomic function in the preterm period.
Method:
Subjects were preterm infants cared for in the Oita University hospital from August 2012 to October 2014. The group that was administered aminophylline (Am+) and the group that received no aminophylline (Am-) included 11 cases that exhibited a mean gestational age of 28weeks 5days and a mean birth weight of 1109g and 8 cases that exhibited a mean gestational age of 30weeks 5days and a mean birth weight of 1223g, respectively. Intravenous aminophylline was administered continuously at a dose of 4-6mg/kg/day followed by oral therapy when the infant suffered repetitive apnoea. Two-hour video recordings were obtained every 2weeks, and electrocardiograms were performed simultaneously. Onset-offset and tremulous movements in general movement (GM) optimality list were used as indices of behaviour. Autonomic functions were investigated via heart-rate and heart-rate variability measurements using frequency domain spectral analysis and the MemCalc method. We compared indices in 4 periods: 30-31, 32-33, 34-35 and 36-37weeks gestation.
Results:
The Am+ group exhibited significantly low optimality of tremulous movements at 32-33weeks gestation. The autonomic parameters did not differ significantly between the Am+ and Am- groups. There was no significant correlation between GMs optimality score and serum theophylline concentration.
Conclusion:
Aminophylline administration was associated with transient irritable behaviour without autonomic changes in the preterm period.
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