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Theophylline improves pneumogram abnormalities in infants at risk for sudden infant death syndrome
Insights
Theophylline significantly improved cardiorespiratory recordings in infants at risk for Sudden Infant Death Syndrome (SIDS). This treatment normalized pneumograms, reducing apnea and periodic breathing, and preventing SIDS deaths.
Area of Science:
- Pediatrics
- Neonatology
- Sleep Medicine
Background:
- Infants at increased risk for Sudden Infant Death Syndrome (SIDS) often exhibit abnormal cardiorespiratory patterns.
- Theophylline is a bronchodilator with potential respiratory stimulant effects.
Purpose of the Study:
- To evaluate the efficacy of theophylline in improving cardiorespiratory recordings (pneumograms) in infants at high risk for SIDS.
- To assess the impact of theophylline on apnea, periodic breathing, and overall pneumogram normalization.
Main Methods:
- Eighty infants with abnormal initial pneumograms, including near-SIDS cases and asymptomatic siblings with SIDS family history, received theophylline.
- Cardiorespiratory recordings (pneumograms) were obtained before and during theophylline treatment.
- Apnea density, periodic breathing episodes, and longest apneic periods were analyzed.
Main Results:
- Theophylline treatment led to significant reductions in apnea density (1.6% to 0.3%), periodic breathing (2.7 to 0.3 episodes/100 min), and longest apneic period (13.5 to 10.1 seconds).
- Pneumogram findings normalized in 87% of near-SIDS infants and 81.5% of asymptomatic siblings.
- No SIDS deaths occurred in the study cohort.
Conclusions:
- Theophylline is effective in normalizing abnormal cardiorespiratory patterns in infants at increased risk for SIDS.
- The treatment appears to mitigate sleep-disordered breathing and prevent SIDS-related outcomes.
- Theophylline demonstrates a favorable safety profile in this high-risk infant population.
Abstract:
To determine the efficacy of theophylline treatment in infants at increased risk for SIDS, we obtained 24-hour cardiorespiratory recordings (pneumograms) in 80 infants given theophylline in whom the initial pneumogram was abnormal. Fifty-three infants had a clinical diagnosis of near-SIDS, and 27 were asymptomatic siblings with a positive family history for SIDS. The initial pneumogram was obtained at a mean age of 6.9 weeks, and the repeat pneumogram 2.3 weeks later, when the mean theophylline blood concentration was 11.2 +/- 0.5 micrograms/ml. Theophylline treatment resulted in comparable and highly significant improvements in both groups. Among all 80 infants, apnea density decreased from 1.6 +/- 0.2% (SEM) to 0.3 +/- 0.1% (P less than 0.001), periodic breathing episodes/100 minutes decreased from 2.7 +/- 0.4 to 0.3 +/- 0.1 (P less than 0.001), and the longest apneic period decreased from 13.5 +/- 0.7 to 10.1 +/- 0.5 seconds (P less than 0.001). Findings on the pneumogram became completely normal with theophylline therapy in 87% of infants with near-SIDS and 81.5% of asymptomatic siblings. Pneumogram normalization was associated with absence of further symptomatic sleep apnea in the near-SIDS group and with continued absence of any clinical symptoms in the asymptomatic family history group. There were no deaths from SIDS.