Risk Factors for Tracheobronchomalacia in Preterm Infants With Bronchopulmonary Dysplasia

Ya-Ting Su, Chun-Che Chiu, Shen-Hao Lai, Shao-Hsuan Hsia, Jainn-Jim Lin, Oi-Wa Chan, Chih-Yung Chiu, Pei-Ling Tseng, En-Pei Lee, Ya-Ting Su, Chun-Che Chiu, Shen-Hao Lai, Shao-Hsuan Hsia, Jainn-Jim Lin, Oi-Wa Chan, Chih-Yung Chiu, Pei-Ling Tseng, En-Pei Lee

Abstract

Aim: To identify the risk factors associated with the development of tracheobronchomalacia (TBM) in preterm infants with bronchopulmonary dysplasia (BPD). Methods: This was a retrospective cohort study using chart reviews of preterm infants born at ≤ 36 week's gestation who underwent flexible fiberoptic bronchoscopy in a tertiary pediatric referral center between January 2015 and January 2020. Indications for the bronchoscopy examination included lobar atelectasis on plain chest film, persistent CO2 retention, recurrent extubation failure, or abnormal breathing sounds such as wheeze or stridor. Optimal cutoff values for each risk factor were also determined. Results: Fifty-eight preterm infants with BPD were enrolled, of whom 29 (50%) had TBM. There were no significant differences in gestational age and birth weight between those with and without TBM. Significantly more of the patients with TBM had severe BPD compared to those without TBM (68.9 vs. 20.6%, p < 0.001). Clinical parameters that were significantly different between the two groups were included in multivariate analysis. Among these factors, severe BPD was the most powerful risk factor for the development of TBM (odds ratio 5.57, 95% confidence interval 1.32-23.5, p = 0.019). The areas under the receiver operating characteristic curves for peak inspiratory pressure (PIP) and the duration of intubation were 0.788 and 0.75, respectively. The best predictive cutoff values of PIP and duration of intubation for TBM were 18.5 mmHg and 82 days, respectively. Conclusion: Preterm infants with severe BPD are at high risk for the development of TBM, and the risk is even higher in those who receive a higher PIP or are intubated for longer. Bronchoscopy examinations should be considered for the early diagnosis and management of TBM in infants with these risk factors.

Keywords: bronchopulmonary dysplasia; bronchoscopy; preterm infants; risk factors; tracheobronchomalacia.

Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Copyright © 2021 Su, Chiu, Lai, Hsia, Lin, Chan, Chiu, Tseng and Lee.

Figures

Figure 1
Figure 1
Flow diagram of study inclusion of preterm infants with BPD who underwent flexible bronchoscopy.
Figure 2
Figure 2
Receiver operating characteristic curves to assess the predictive accuracy of parameters for TBM. (A) Peak inspiratory pressure. (B) Duration of intubation (days).

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