Why the study?
Is beat-to-beat heart rate variation increased in children with allergic asthma compared to nonallergic children?
Is beat-to-beat heart rate variation increased in children with allergic asthma compared to nonallergic children?
Increased heart rate variability (CVR-R) is associated with the allergic state in children, regardless of the presence of asthma, suggesting increased cholinergic tone.
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Elevated CVR-R in allergic children supports cholinergic tone hypothesis; hypothesis-generating and should not change practice.
Beat-to-beat variation of the heart rate in 53 allergic asthmatic children was quantitatively measured as a coefficient of variation of the R-R interval (CVR-R), and was compared with that of 284 nonallergic and 47 allergic children without asthma. Allergic children both with and without asthma had significantly higher mean CVR-R values (7.08 +/- 1.87 and 7.54 +/- 2.40 and p less than 0.01 and p less than 0.001, respectively) than those of non-allergic children (6.32 +/- 1.88). These results confirm the previous reports that the increased cholinergic tone was related to the allergic state and not only to allergic asthma.
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Tokuyama et al. (1985) studied this question.
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