Respiratory Admittance Response to Exercise Challenge Test in Children
试验速览
- 阶段
- 不适用
- 状态
- 尚未招募
- 发起方
- 入组人数
- 144
- 主要终点
- Diagnostic performance of Ars
研究概览
简要总结
Oscillometry is a pulmonary function testing technique suited for children because it does not require specific respiratory maneuvers like spirometry. Oscillometry provides a measure of respiratory impedance (Zrs) that is underestimated when the oscillatory signal is applied at the subject's mouth particularly during bronchoconstriction induced by an exercise challenge test (ECT). This limitation may be overcome by calculating respiratory admittance (Ars), the inverse of respiratory impedance during an ECT.
详细描述
Oscillometry is a pulmonary function testing technique that is well suited to children who have difficulty cooperating with conventional tests such as spirometry, as it is performed during spontaneous breathing and does not require specific respiratory maneuvers. In contrast, spirometry requires a deep inspiration followed by a forced and complete expiration.
Oscillometry provides a measure of respiratory impedance, which is the complex sum of respiratory resistance (Rrs) and respiratory reactance (Xrs). However, when the oscillatory signal is applied directly at the subject's airway opening, part of the flow signal may be lost due to cheek wall vibrations, resulting in an underestimation of Rrs. This underestimation may be more pronounced during bronchoconstriction, such as that induced by an exercise challenge test (ECT). This limitation may be overcome by calculating respiratory admittance (Ars), the inverse of respiratory impedance. When calculating the response to ECT, cheek wall admittance is cancelled out, potentially allowing a more accurate assessment of changes in respiratory mechanics during an ECT.
The hypothesis was that calculating Ars provides a more accurate assessment of changes in airway mechanics during an ECT.
研究设计
- 研究类型
- Observational
- 观察模型
- Cohort
- 时间视角
- Retrospective
入排标准
- 年龄范围
- 5 Years 至 16 Years（Child）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Children aged 5 to 16 years
- •Children addressed by the pediatric pulmonologist to an exercise challenge test between January 2023 and April 2026
- •Children with interpretable and reproducible oscillometric measurements
- •Children with interpretable and reproducible spirometric measurements
排除标准
- •Children who performed only spirometric measurements
- •Children who performed only oscillometric measurements
- •Children whose oscillometric and spirometric measurements are non-interpretable
- •Children whose oscillometric and spirometric measurements are non-reproducible
研究组 & 干预措施
Children with positive response to exercise challenge test
Children aged 5 to 16 years old who performed an exercise challenge test and had a decrease of ≥ 10% in FEV1 after test (FEV1 = forced expiratory volume in 1 sec obtained by forced spirometry)
Children with NEGATIVEresponse to exercise challenge test
Children aged 5 to 16 years old who performed an exercise challenge test and had a decrease of < 10% in FEV1 after test (FEV1 = forced expiratory volume in 1 sec obtained by forced spirometry)
结局指标
主要结局
Diagnostic performance of Ars
时间窗: Through study completion, an average of 1 month
Area under the ROC curves (AUC) for response to exercise challenge of Ars (computed from oscillometric parameters) compared with AUC of respiratory resistance to identify children with a positive challenge test and children with a negative challenge test
次要结局
- Sensitivity of Ars(Through study completion, an average of 1 month)
- Specificity of Ars(Through study completion, an average of 1 month)
研究者
Dr. Iulia IOAN
Head of Pediatric Function Testing Department
Central Hospital, Nancy, France