Cough symptoms
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Understanding Cough Symptoms: Causes, Assessment, and Management
Common Causes of Cough Symptoms
Asthma and Cough-Variant Asthma
Asthma is a prevalent cause of chronic cough, particularly in adult nonsmokers. Cough can be a precursor to typical asthmatic symptoms or may present as the sole symptom, known as cough-variant asthma (CVA). Diagnosis of CVA can be challenging as physical examinations and spirometry may appear normal. Methacholine inhalation challenge testing is often used to demonstrate bronchial hyperresponsiveness, and the diagnosis is confirmed when the cough resolves with antiasthmatic therapy .
Environmental and Exercise-Induced Factors
In athletes, cough is frequently associated with environmental exposures and intense exercise. Common causes include asthma, exercise-induced bronchoconstriction, respiratory tract infections, and upper airway cough syndrome (UACS) from rhinitis. Less common causes include exercise-induced vocal cord dysfunction. Gastroesophageal reflux disease (GERD) is also frequent among athletes, although specific publications linking GERD to cough in this population are lacking .
Pediatric Considerations
In children, chronic cough is often due to cough-variant asthma, sinusitis, gastroesophageal reflux, and other conditions such as psychogenic cough and sub-glottic stenosis. Management guidelines for pediatric chronic cough have been updated to include high-quality evidence for some aspects, such as the use of algorithms and appropriate antibiotics for wet/productive cough Chang2020Holinger1991.
Other Determinants
Cough in the general population can be influenced by factors such as asthma, rhinitis, tobacco smoking, environmental tobacco smoke, and obesity. Females are more likely to report nocturnal and nonproductive cough compared to males .
Assessment of Cough Symptoms
Diagnostic Approaches
The assessment of chronic cough involves a systematic approach to identify the underlying cause. This includes clinical history, physical examination, and specific investigations such as bronchoprovocation tests, spirometry, and methacholine challenge testing. In some cases, imaging studies like computed tomography (CT) and investigations like bronchoalveolar lavage (BAL) may be necessary Morice2004Irwin2000.
Special Considerations for Athletes
For athletes, the assessment of cough should consider the specific training environment and potential anti-doping regulations. Investigations often include bronchoprovocation tests and disease-specific assessments to identify the cause and guide treatment .
Management of Cough Symptoms
General Management Strategies
The management of chronic cough typically involves treating the underlying cause. For asthma-related cough, standard antiasthmatic therapies such as inhaled bronchodilators and corticosteroids are effective. In some cases, leukotriene receptor antagonists or a short course of oral corticosteroids may be required .
Pediatric Management
In children, management guidelines emphasize the use of diagnostic algorithms and appropriate antibiotic therapy for productive cough. However, there is still a need for further studies, particularly in primary healthcare settings, to improve the management of non-specific cough .
Neuropathic Considerations
Chronic cough can also be viewed as a neuropathic disorder, where neural damage from inflammatory, infective, or allergic factors leads to cough-reflex hyperresponsiveness. Treatments for neuropathic pain, such as gabapentin and amitriptyline, have shown success in managing chronic cough .
Post-COVID Syndrome
Cough is a common symptom of COVID-19 and can persist as part of the post-COVID syndrome, often accompanied by chronic fatigue and cognitive impairment. The mechanisms involve neurotropism, neuroinflammation, and neuroimmune responses. Potential treatments include neuromodulators and anti-inflammatories to target both acute and chronic COVID-19-associated cough .
Conclusion
Cough is a multifaceted symptom with various underlying causes, ranging from asthma and environmental factors to neuropathic disorders and post-infectious states. Accurate diagnosis and targeted treatment are essential for effective management. While significant progress has been made in understanding and treating cough, ongoing research is needed to address gaps, particularly in pediatric care and post-COVID syndrome management.
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