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High-speed Video Microscopy Analysis for First-line Diagnosis of Primary Ciliary Dyskinesia
Published on: January 19, 2022
Primary ciliary dyskinesia and neonatal respiratory distress
Tara Mullowney1, David Manson2, Raymond Kim3
1Divisions of Respiratory Medicine and Departments of Post Graduate Medical Education and.
Insights
Diagnosing primary ciliary dyskinesia (PCD) in neonates with respiratory distress is crucial. Key indicators include lobar collapse, situs inversus, and prolonged oxygen therapy, aiding early identification of this rare genetic disorder.
Area of Science:
- Medical Research
- Genetics
- Neonatology
Background:
- Primary ciliary dyskinesia (PCD) is a rare genetic disorder affecting respiratory cilia.
- Neonatal respiratory distress is an early symptom, but diagnosis is often delayed.
- Differentiating PCD from other causes of neonatal respiratory distress is challenging.
Purpose of the Study:
- To identify specific neonatal characteristics that distinguish PCD from common causes of respiratory distress in term neonates.
- To improve the timeliness of PCD diagnosis through early recognition of key clinical signs.
Main Methods:
- A case-control study comparing 46 patients with PCD and neonatal respiratory distress to 46 matched controls.
- Data collected included oxygen therapy duration, onset of respiratory distress, and presence of lobar collapse or situs inversus.
- Logistic regression analysis was used to identify predictive variables for PCD.
Main Results:
- PCD cases showed significantly higher oxygen requirements and longer oxygen therapy duration.
- Neonatal respiratory distress onset was later in PCD cases (median 12 hours vs. 1 hour).
- Lobar collapse and situs inversus were frequent in PCD cases (70% and 48%) but absent in controls.
Conclusions:
- Lobar collapse, situs inversus, or oxygen need exceeding two days are strong indicators of PCD in term neonates.
- These findings suggest that clinicians should consider PCD in neonates presenting with unexplained respiratory distress and these specific characteristics.
- Early identification of PCD can lead to timely intervention and management of this rare inherited disease.
Background And Objective:
Primary ciliary dyskinesia (PCD) is a rare inherited disease affecting motile cilia lining the respiratory tract. Despite neonatal respiratory distress as an early feature, diagnosis is typically delayed until late childhood. Our objective was to identify characteristics that differentiate PCD from common causes of term neonatal respiratory distress.
Methods:
This was a case-control study. Patients with PCD born after 1994 attending a regional PCD clinic who had a history of neonatal respiratory distress (n = 46) were included. Controls (n = 46), term neonates with respiratory distress requiring a chest radiograph, were randomly selected from hospital birth records and matched on gender, birth month/year, and mode of delivery. Multiple logistic regression was used to determine the association between neonatal characteristics and PCD diagnosis. The diagnostic performance of the best predictive variables was estimated by calculating sensitivity and specificity.
Results:
PCD cases required more oxygen therapy (39 cases, 29 controls, P = .01), longer duration of oxygen therapy (PCD mean = 15.2 days, control mean = 0.80 days, P < .01), had later onset of neonatal respiratory distress (PCD median = 12 hours, control median = 1 hour, P < .001), and higher frequency of lobar collapse and situs inversus (PCD = 70% and 48% respectively, control = 0% for both, P < .001). Situs inversus, lobar collapse, or oxygen need for >2 days had 87% (95% confidence interval: 74-94) sensitivity and 96% (95% confidence interval: 85-99) specificity for PCD.
Conclusions:
When encountering term neonates with unexplained respiratory distress, clinicians should consider PCD in those with lobar collapse, situs inversus, and/or prolonged oxygen therapy (>2 days).
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