Abstract
Background:
Childhood sleep disordered breathing (SDB) presents as isolated respiratory events or episodes of consecutive repetitive events. We hypothesized that the surge in blood pressure (BP) and heart rate (HR) would be greater at the termination of events during episodes of repetitive events than following isolated events.
Methods:
% change in HR and pulse transit time (PTT; inverse surrogate of BP) were calculated from the last half of an event to: (i) between successive repetitive events; (ii) termination of the last repetitive event; (iii) event termination for isolated events.
Results:
69% of the children exhibiting both isolated and repetitive events had more repetitive than isolated events. %HR change between repetitive events (27 ± 1%) was greater than at event termination for isolated events (17 ± 1%; P < 0.001). %PTT change at the termination of the last repetitive event (−8 ± 2%) was greater than at the termination of isolated events (−2 ± 2%; P < 0.05).
Conclusion:
Episodes of repetitive respiratory events evoke a greater acute cardiovascular response, including surges in BP and HR between events, than do isolated events. Given that the majority of respiratory events in preschool children occur as repetitive episodes, this finding should be taken into account when assessing the impact of respiratory events for a given child.
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Acknowledgements
The authors would like to thank the children and families who participated in this study and the staff of the Melbourne Children’s Sleep Centre for their support.
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Walter, L., Biggs, S., Nisbet, L. et al. Augmented cardiovascular responses to episodes of repetitive compared with isolated respiratory events in preschool children with sleep-disordered breathing. Pediatr Res 78, 560–566 (2015). https://doi.org/10.1038/pr.2015.147
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DOI: https://doi.org/10.1038/pr.2015.147
