Noninvasive allergic sinus congestion and resolution assessments using microcomputed tomography imaging

Area of Science:

• Immunology and Allergy
• Medical Imaging
• Pharmacology

Background:

• Allergic rhinosinusitis causes significant sinus congestion, impacting asthma, breathing, and daily life.
• Accurate quantification of sinus congestion is vital for understanding allergic rhinosinusitis and developing effective treatments.
• Current methods for assessing sinus congestion may lack the precision needed for drug development.

Purpose of the Study:

• To evaluate the utility of noninvasive microcomputed tomography (micro-CT) for accurately measuring sinus congestion.
• To assess the effectiveness of micro-CT in monitoring the resolution of sinus congestion with anti-inflammatory drug administration.
• To compare micro-CT measurements with the gold-standard sinus fluid fill-volume (SFFV) method.

Main Methods:

• A guinea pig model of allergic rhinosinusitis was induced using ragweed pollen (RWP).
• Micro-CT was used to measure three-dimensional sinus air-space volume, width, area, and perimeter.
• Measurements were compared with SFFV to validate micro-CT accuracy in assessing congestion and its resolution after fluticasone treatment.

Main Results:

• RWP administration caused a concentration-dependent increase in sinus congestion, with near-total blockage at ≥22 µg RWP.
• Fluticasone treatment progressively reduced sinus congestion in a dose-dependent manner.
• Micro-CT measurements closely mirrored SFFV findings, accurately reflecting increases and decreases in sinus congestion.

Conclusions:

• Noninvasive micro-CT is a reliable tool for quantifying allergic sinus congestion in an animal model.
• Micro-CT can effectively assess the intensity of congestion and monitor therapeutic responses.
• This method holds potential for advancing the development of new drug therapies for human sinus diseases.