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Published on: January 19, 2022
RSPH4A-PCDx: An Index to Predict Lung Function Decline in Primary Ciliary Dyskinesia
Gabriel Román-Ríos1, Gabriel Rosario-Ortiz1, Marcos J Ramos-Benitez1
1Department of Basic Sciences, Ponce Health Sciences University, Ponce, PR 00716, USA.
Primary ciliary dyskinesia (PCD) patients with RSPH4A mutations experience significant lung function decline. A new tool, PCDx, predicts decline to aid in managing this rare genetic disorder.
Area of Science:
- Pulmonology
- Genetics
- Rare Diseases
Background:
- Primary ciliary dyskinesia (PCD) is a rare genetic disorder affecting mucociliary clearance and causing progressive lung disease.
- RSPH4A mutations represent a specific genetic cause of PCD, necessitating tailored management strategies.
Purpose of the Study:
- To characterize lung function decline in a Puerto Rican cohort of patients with RSPH4A-associated PCD.
- To develop a predictive clinical tool for lung function decline and lung transplant referral decisions.
Main Methods:
- Retrospective chart review of 25 patients with confirmed RSPH4A [c.921+3_6delAAGT] variant.
- Longitudinal spirometry data collection and linear regression analysis to determine individual FEV1 decline rates.
- Development of the Predicted Capacity Decline Index (PCDx) to estimate time to FEV1 threshold.
Main Results:
- Median FEV1 at diagnosis was 55% predicted, with a median annual decline of -0.75% predicted.
- Adult patients showed significantly lower lung function than pediatric patients.
- The PCDx tool was developed to predict time to the 30% FEV1 threshold for transplant consideration.
Conclusions:
- RSPH4A-associated PCD involves significant progressive lung function decline, particularly in adults.
- The PCDx index offers a genotype-specific tool to aid clinical decision-making and transplant referral.
- Early intervention is crucial for managing progressive lung disease in PCD.
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