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Validation of Polyvinylidene Fluoride Impedance Sensor for Respiratory Event Classification during Polysomnography in
Anne G Griffiths1, Pallavi P Patwari2, Darius A Loghmanee3,4
1Children's Respiratory and Critical Care Specialists, Minneapolis, MN.
Insights
Polyvinylidene fluoride (PVDF) belts are as effective as respiratory inductance plethysmography (RIP) belts for detecting respiratory events in children during sleep studies. This finding supports the use of PVDF belts in pediatric sleep-disordered breathing diagnosis.
Area of Science:
- Pediatric Sleep Medicine
- Respiratory Physiology
- Diagnostic Technology Evaluation
Background:
- Polysomnography is crucial for diagnosing sleep-disordered breathing.
- Current guidelines recommend respiratory inductance plethysmography (RIP) belts for children, while polyvinylidene fluoride (PVDF) belts are restricted to adults.
- Accurate respiratory event detection is vital for reliable diagnosis and severity assessment.
Purpose of the Study:
- To evaluate the efficacy of PVDF belts compared to RIP belts in detecting respiratory effort and events in children.
- To determine if PVDF belts are a suitable alternative to RIP belts for pediatric polysomnography.
Main Methods:
- Fifty children aged 2-17 years participated in the study.
- Respiratory events were scored using both RIP and PVDF belts.
- A pre-defined limit of agreement (± 5 events) was used to assess scoring differences.
Main Results:
- No significant differences were found in the scoring of total apnea-hypopnea index and obstructive apneas between PVDF and RIP belts.
- Scoring for obstructive hypopneas occasionally exceeded the clinical limit of agreement.
- Comparable artifact levels were observed between the two belt types.
Conclusions:
- PVDF belts demonstrate comparable effectiveness to RIP belts in detecting respiratory effort and events in pediatric patients.
- These findings suggest PVDF belts can be considered for use in pediatric sleep studies.
Study Objectives:
Polysomnography is the gold standard for diagnosis and characterization of severity of sleep-disordered breathing. Accuracy and reliability of the technology used are critical to the integrity of the study's interpretation. Strict criteria for obstructive sleep apnea in children are lacking and diagnosis often requires consideration of frequency of respiratory events in addition to other measures. Current American Academy of Sleep Medicine recommendations for pediatric patients includes use of respiratory inductance plethysmography (RIP) belts, whereas polyvinylidene fluoride (PVDF) belts are currently only acceptable for use in adults. We hypothesized that PVDF belts would be equally effective as RIP belts for detection of respiratory effort and events in children.
Methods:
Children ages 2-17 y were recruited from a large pediatric tertiary referral center after obtaining consent for participation. Fifty subjects were recruited (average age, 7.8 y). Clinically relevant limits of agreement were predetermined to be a difference in total count of obstructive or central apneas or hypopneas of ± 5 events.
Results:
Scoring of respiratory events was not significantly different by belt type based on Bland-Altman plots of total apnea-hypopnea index and obstructive apneas. Obstructive hypopneas scoring ranged beyond our clinical limit of agreement. Findings in obese subjects were consistent with the larger sample with the exception of an increase in outliers. Artifact amount was comparable (RIP 10.9% ± 22.5% and PVDF 10.5% ± 19.5%).
Conclusions:
Based on these findings, PVDF belts appear to be as effective as RIP belts in detection of respiratory effort and events in children.
Commentary:
A commentary on this article appears in this issue on page 159.
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