Cough, Colds & Influenza - In Depth Notes

Responding to Symptoms: Cough, Colds & Influenza

Definitions and Symptoms

• Cough

  • Definition: A reflex response to airway irritation, triggered by stimulating airway cough receptors.

  • Types:

  • Acute: Less than 3 weeks, usually caused by Upper Respiratory Tract Infections (URTIs), self-limiting.

  • Sub-acute: 3 to 8 weeks, often related to airway hyper-responsiveness post-infection.

  • Chronic: Over 8 weeks, commonly due to exposure to smoke, ACE inhibitors, upper airway cough syndrome, asthma, COPD, gastro-oesophageal reflux disease.

  • Symptoms:

  • Productive: Produces mucus/phlegm, known as a 'chesty' cough.

  • Unproductive: No mucus, described as 'dry' or 'tickly'.

• Common Cold (Coryza)

  • Definition: Mild, self-limiting URTI characterized by nasal stuffiness, discharge, sneezing, sore throat, and cough.

  • Causes: Caused by various viruses, predominantly rhinoviruses.

  • Symptoms:

  • Nasal irritation, congestion, sneezing, sore throat, and cough (30% incidence).

  • Fever, headache, myalgia less common.

• Influenza (Flu)

  • Definition: Acute respiratory illness caused by orthomyxoviruses (Influenza A, B, and C).

  • Symptoms:

  • Abrupt onset of fever, cough, generalized body aches, ocular symptoms, sore throat.

Management of Cough

• Initial Management:

  • For acute cough due to viral infections: Steam inhalation, honey and lemon, paracetamol/ibuprofen for symptoms.

  • Key Advice: Most coughs resolve on their own over time; no quick fix for viral infections.

• OTC Medications:

  • Antitussives: Suppress cough reflex, e.g., dextromethorphan.

  • Expectorants: Help loosen mucus, e.g., guaifenesin.

  • Antihistamines: Reduce congestion, e.g., diphenhydramine.

  • Decongestants: Relief of nasal congestion, e.g., phenylephrine, pseudoephedrine.

Alarm Features (Red Flags) for Cough and Cold

• Seek Immediate Care If:

  • Symptoms worsen, last beyond expected duration (3-4 weeks).

  • Symptoms of dehydration in young children or persistent fever.

  • Develops shortness of breath, or coughs up blood.

  • Significant underlying conditions (asthma, COPD, immunocompromised) are present.

Evidence and Efficacy

• Cough Medicines: Current reviews indicate lack of evidence supporting OTC cough medicines for viral cough; more studies needed.

• Lifestyle Advice:

  • Avoid irritants (smoking) and maintain hydration.

  • Manage symptoms with appropriate pain relief when necessary (paracetamol/ibuprofen).

Transmission and Prevention of Common Cold

• Transmission Routes:

  • Direct contact, aerosols (coughing/sneezing), fomite transmission (contaminated surfaces).

  • Children act as reservoirs due to close contact with others.

Management Strategies for Cold Symptoms

• Pain Relief: Use paracetamol or ibuprofen as first-line treatments, avoid multi-ingredient medications.

• Nasal Drops/Spray: Saline nasal drops can relieve congestion; avoid overuse of decongestant sprays to prevent rebound congestion.

• Public Health Measures: Regular hand hygiene and avoiding close contact with infected individuals can help reduce transmission.

Conclusion

Understanding these conditions, their symptoms, management strategies, and alarm features is crucial for effective treatment and when to seek further medical assistance. Keeping up with the latest evidence regarding treatment efficacy ensures optimal patient care.