Should computed tomography and bronchoscopy be routine examinations for chronic cough?

Area of Science:

• Pulmonology
• Diagnostic Imaging
• Respiratory Medicine

Background:

• Chronic cough is a prevalent symptom linked to various underlying conditions.
• Current guidelines often recommend chest X-rays as the initial diagnostic step.
• Chest X-rays have limitations in detecting certain pathologies compared to advanced imaging.

Purpose of the Study:

• To evaluate the potential of chest computerized tomography (CT) and bronchoscopy as first-line examinations for chronic cough.
• To explore the diagnostic utility of CT and bronchoscopy in identifying causes of persistent cough, including rare conditions.
• To compare the effectiveness of CT and X-ray in diagnosing diseases associated with chronic cough.

Main Methods:

• Review of current diagnostic guidelines and literature on chronic cough.
• Comparative analysis of the sensitivity of chest X-ray, chest CT, and bronchoscopy in diagnosing various causes of chronic cough.
• Discussion of the role of induced sputum cytology in chronic cough diagnosis.

Main Results:

• Chest CT is more sensitive than chest X-ray in detecting abnormalities like bronchial tumors and interstitial lung diseases.
• Bronchoscopy is crucial for diagnosing rare bronchial conditions such as amyloidosis and foreign body inhalation.
• Induced sputum cytology has gained importance with the recognition of non-asthmatic eosinophilic bronchitis as a common cause of chronic cough.

Conclusions:

• Chest CT and bronchoscopy show increasing importance in diagnosing the causes of chronic cough.
• In certain regions or for suspected rare causes, CT and bronchoscopy may be recommended as initial diagnostic examinations.
• These advanced methods can help avoid unnecessary investigations and treatments for chronic cough by providing more accurate diagnoses.