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Infant heart rate response to trigeminal airstream stimulation: determination of normal and deviant values
Insights
Trigeminal airstream stimulation in infants can screen for reflex bradycardia. Heart rate responses vary with age and initial heart rate, helping define normal and abnormal reactions.
Area of Science:
- Neonatal physiology
- Cardiovascular reflexes
Background:
- Assessing autonomic nervous system function in infants is crucial for early detection of potential health issues.
- Reflex bradycardia can be a sign of underlying medical conditions in newborns.
Purpose of the Study:
- To establish a method for screening reflex bradycardia in sleeping infants using trigeminal airstream stimulation.
- To determine the typical heart rate responses to this stimulation across different infant ages.
- To develop criteria for classifying normal versus abnormal heart rate reactions.
Main Methods:
- Trigeminal airstream stimulation was applied to sleeping infants aged 1-3 days and 4, 8, 12, 16 weeks.
- Heart rate changes were recorded and analyzed in relation to prestimulus heart rate and postconceptional age.
- Multiple regression analysis was used to estimate expected heart rate responses.
Main Results:
- The typical response was heart rate acceleration.
- Heart rate changes were influenced by prestimulus heart rate and postconceptional age.
- Six infants showed deviant responses (2 increases, 4 decreases) outside expected ranges.
- One infant exhibited a significant heart rate decrease, potentially indicating a diving reflex.
Conclusions:
- Trigeminal airstream stimulation is a viable method for screening reflex bradycardia in infants.
- Established ranges help differentiate normal from abnormal heart rate responses.
- Deviant bradycardic responses may warrant further investigation for conditions like the diving reflex.
Abstract:
In this study, trigeminal airstream stimulation is used on a group of normal, sleeping infants to screen for reflex bradycardia. Infants were tested at 1--3 days and at 4, 8, 12, and 16 weeks of age. The usual heart rate response was acceleration above the prestimulus level. The amount of heart rate change was seen to depend on prestimulus rate and, to a lesser extent, postconceptional age. Multiple regression analysis of the data provided estimates of expected responses, given postconceptional age and prestimulus heart rate. From these, ranges were established for classification of normal or abnormal responses. Six deviant data points over 2 SDs from expected values were identified. Two of these represented heart rate increases and four were heart rate decreases. One deviant heart rate decrease was over 3 SDs from the mean. Although the deviant increases were thought to represent exaggerated startles, the more severe heart rate decreases were believed to be a reflex resembling the diving reflex.