# Study of Focal Airway Disease in Asthma Using Image Guided Bronchoscopy

> **NCT04514913** · — · WITHDRAWN · sponsor: **University of California, San Francisco**

## Conditions studied

- Asthma
- Mucus; Plug, Tracheobronchial

## Interventions

- **RADIATION:** Multidetector Computed Tomography (MDCT) Scan
- **PROCEDURE:** Virtual Navigation Bronchoscopy (VNB)

## Key facts

- **NCT ID:** NCT04514913
- **Lead sponsor:** University of California, San Francisco
- **Sponsor class:** OTHER
- **Phase:** —
- **Study type:** OBSERVATIONAL
- **Status:** WITHDRAWN
- **Start date:** 2023-02
- **Primary completion:** 2023-02-09
- **Final completion:** 2023-02-09
- **Target enrollment:** 0 (ACTUAL)
- **Why stopped:** The restrictions on research imposed for the COVID-19 pandemic prevented us from launching study recruitment and visits. At this stage our funding is not sufficient to allow us to enroll sufficient numbers of patients so we will close the study.
- **Last updated:** 2026-03-06

## Collaborators

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## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04514913

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04514913, "Study of Focal Airway Disease in Asthma Using Image Guided Bronchoscopy". Retrieved via AI Analytics 2026-05-24 from https://api.ai-analytics.org/clinical/NCT04514913. Licensed CC0.

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