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Respiratory System Symptomatology

References: Fishman's Pulmonary Diseases and Disorders (2-Vol); Murray & Nadel's Textbook of Respiratory Medicine (2-Vol); Harrison's Principles of Internal Medicine 22E (2025)

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Overview

1. Cough
2. Dyspnea (shortness of breath)
3. Hemoptysis (coughing up blood)
4. Chest pain / Thoracic pain

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1. Cough

What is it?

Types by Duration

Red Flags in Cough (Require Urgent Workup)

• Hemoptysis
• New cough in a smoker over age 45
• Change in character of existing cough or change in voice
• Any cough in a 55-80 year old with 30+ pack-year smoking history
• Cough with: prominent dyspnea at rest/night, hoarseness, fever, weight loss, dysphagia, vomiting
• History of recurrent pneumonia

Complications of Severe/Chronic Cough

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2. Dyspnea (Shortness of Breath)

What is it?

Special Types of Dyspnea

Assessment Tips

• Ask: How many stairs before stopping? Distance walking on level ground?
• Does talking, getting dressed, or eating cause dyspnea?
• Does dyspnea occur at rest?
• Triggers: cigarette smoke, dust, molds, perfumes
• Associated features like wheezing, productive cough, fever, or leg edema help narrow the cause. - Murray & Nadel's, block4, line 3490-3495

Measuring Dyspnea

• Borg Scale - rates perceived exertion/breathlessness
• MRC (British Medical Research Council) Questionnaire
• Pulmonary Functional Status and Dyspnea Questionnaire

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3. Hemoptysis (Coughing Up Blood)

What is it?

Hemoptysis vs. Hematemesis

• Fishman's Pulmonary Diseases, block5, line 3958

Common Causes by Age/Context

• Before middle age - infections (TB, bronchitis, bronchiectasis)
• After age 40-45 / smokers - bronchogenic carcinoma heads the list
• Pulmonary cavities post-TB - fungal disease (aspergilloma)
• History of oral contraceptives or heart failure - pulmonary embolism

Key Causes Summary

• Airways: Bronchitis, bronchiectasis, neoplasm
• Parenchyma: Tuberculosis, pneumonia, lung abscess, Aspergillus
• Vascular: Pulmonary embolism, arteriovenous malformation, mitral stenosis
• Inflammatory: Granulomatosis with polyangiitis, Goodpasture syndrome
• Iatrogenic: Post-lung biopsy, chemotherapy-induced diffuse alveolar hemorrhage

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4. Chest / Thoracic Pain

Common Respiratory Causes

• Pleuritis (pleural inflammation) - in pneumonia, pulmonary embolism, TB
• Pneumothorax - sudden onset, sharp unilateral pain with dyspnea
• Malignancy - dull, constant pain from chest wall or pleural invasion
• Musculoskeletal (costochondritis, intercostal muscle strain from coughing)

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5. Other Important Respiratory Symptoms

Wheezing

• High-pitched musical sound from narrowed airways
• Classic in asthma, COPD exacerbation, bronchospasm
• Can also occur in heart failure ("cardiac asthma")

Stridor

• Harsh, high-pitched sound on inspiration
• Indicates upper airway obstruction (larynx or trachea)
• Emergency sign - may signal foreign body, epiglottitis, croup, or tumor

Sputum Production

• Clear/white: Viral infection, asthma
• Yellow/green (purulent): Bacterial infection
• Rust-colored: Pneumococcal pneumonia (classic)
• Pink and frothy: Pulmonary edema
• Black: Coal worker's pneumoconiosis

Hoarseness

• Can indicate recurrent laryngeal nerve involvement (e.g., lung cancer causing vocal cord paralysis)

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Quick Clinical Summary Table

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Key References

1. Grippi MA. "Approach to the Patient with Respiratory Symptoms." - Fishman's Pulmonary Diseases and Disorders, 2-Volume Set (Chapter 27)
2. Murray & Nadel's Textbook of Respiratory Medicine, 2-Volume - Sections on Cough (Ch. 37), Dyspnea (Ch. 36), Hemoptysis
3. DeBiasi EM, D'Ambrosio C. "Hemoptysis." - Harrison's Principles of Internal Medicine, 22nd Edition (2025), Chapter on Hemoptysis
4. Textbook of Family Medicine, 9th Edition - Section on Dyspnea and Cough in primary care

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🫁 RESPIRATORY SYSTEM SYMPTOMATOLOGY

For MBBS 1st/2nd Year Students

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MASTER OVERVIEW FLOWCHART

         PATIENT PRESENTS WITH CHEST / BREATHING COMPLAINT
                              │
         ┌────────────────────┼────────────────────────┐
         │                    │                         │
      COUGH               DYSPNEA                CHEST PAIN
         │                    │                         │
    ┌────┴────┐         ┌──────┴──────┐           ┌─────┴─────┐
  Acute   Chronic    Exertional  At Rest        Pleuritic  Non-pleuritic
 (<3wk)  (>8wk)                               (sharp,     (dull,
                                               breathing)  constant)
         │
    HEMOPTYSIS
    (blood in sputum)
         │
   ┌─────┴──────┐
  Mild         Massive
 (streaks)    (>150mL/24h)
                   │
            EMERGENCY ⚠️

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SYMPTOM 1: COUGH

Definition

A reflex protective mechanism that clears the airways of inhaled noxious substances and excess secretions.

• "Coughing is an essential mechanism that protects the airways from inhaled noxious substances." - Murray & Nadel's Textbook of Respiratory Medicine

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Point-wise Classification by Duration

• Most common cause: viral upper respiratory tract infection (URTI)
• Other causes:
  • Exacerbation of asthma or COPD
  • Pneumonia
  • Pulmonary embolism (uncommon)
  • Inhalation of allergens/irritants

• Post-infectious cough (most common)
• Upper airway cough syndrome (rhinosinus disease)
• Exacerbations of underlying illness

• Top 3 causes to memorize:
  1. Upper Airway Cough Syndrome (UACS) - postnasal drip
  2. Asthma (cough-variant asthma)
  3. Gastroesophageal Reflux Disease (GERD)
• Other causes:
  • ACE inhibitor use (drug-induced)
  • Bronchiectasis, TB, interstitial lung disease
  • Malignancy

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Cough Flowchart

              PATIENT WITH COUGH
                     │
          How long has it lasted?
         ┌───────────┴───────────┐
       < 3 weeks              > 8 weeks
       ACUTE                  CHRONIC
         │                       │
    Viral URTI?            Check the BIG 3:
    Pneumonia?             1. UACS (post-nasal drip)
    Asthma flare?          2. Asthma
    PE?                    3. GERD
                               │
                       Also ask about:
                       - ACE inhibitor use
                       - Smoking history
                       - Occupational exposure
                               │
                     ANY RED FLAGS? ──► Investigate further
                     (see below)

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RED FLAGS in Cough - Must Memorize ⚠️

"The medical history alone led to the correct diagnosis in 70% of patients with chronic cough." - Murray & Nadel's

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Complications of Severe/Chronic Cough

1. Tussive syncope (fainting from coughing)
2. Retinal vessel rupture
3. Rib fractures
4. Subcutaneous emphysema
5. Pneumothorax
6. Abdominal wall hernia
7. Persistent headache
8. Chest wall and abdominal muscle strains

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SYMPTOM 2: DYSPNEA (Shortness of Breath)

Definition

An uncomfortable awareness of breathing that is abnormal for the level of activity being performed.

• "Tightness in the chest"
• "Choking sensation"
• "Cannot take a deep breath"
• "Suffocating"
• "Cannot get enough air"
• "Feeling tired / breathless"
• Murray & Nadel's Textbook of Respiratory Medicine

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Point-wise Types of Dyspnea - MUST KNOW TABLE

Memory tip for PND: "PND = Patient Needs Divan" (sits upright to breathe at night)

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Dyspnea Flowchart

              PATIENT WITH DYSPNEA
                      │
         ┌────────────┼────────────┐
         │            │            │
     Onset?        Position?   Associated?
         │            │            │
      Acute        Worse       Wheezing?
    (minutes)      lying       ──► Asthma / COPD
         │         (Orthopnea) 
    Think:         ──► Heart    Leg edema?
    PE, PTX,           failure  ──► Heart failure
    Asthma
                    Better      Fever + cough?
                   lying?       ──► Pneumonia
                    (Platypnea)
                   ──► Vascular  Only at night?
                       shunt    (PND)
                                ──► LV failure
                      
         Progressive / Gradual onset?
         ──► COPD, ILD, pulmonary hypertension

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Assessing Severity of Dyspnea (MRC Scale)

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SYMPTOM 3: HEMOPTYSIS (Coughing Up Blood)

Definition

Expectoration of blood originating from the lower respiratory tract (glottis to alveolus).

• Harrison's Principles of Internal Medicine 22E (2025)

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Classification by Volume

              HEMOPTYSIS
                  │
      ┌───────────┴───────────┐
      │                       │
   MILD / SCANT            MASSIVE
   (blood-streaked          (>150 mL/24h OR
    sputum)                  >100 mL/hour)
      │                       │
   Investigate              EMERGENCY ⚠️
   electively               Immediate hospitalization
                            Risk of airway flooding
                            and asphyxiation

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Hemoptysis vs Hematemesis - KEY DISTINCTION

Fishman's Pulmonary Diseases and Disorders, Chapter 27

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Causes of Hemoptysis - Flowchart by Age/Context

        HEMOPTYSIS - What is the most likely cause?
                         │
          ┌──────────────┼──────────────┐
          │              │              │
       YOUNG            MIDDLE       ELDERLY/
      PATIENT           AGE          SMOKER
          │              │              │
       Infection      TB / Cancer   Lung Cancer
       (TB, viral     Bronchiec-    (1st suspect)
        bronchitis)   tasis
          
                         │
              ┌──────────┴──────────┐
              │                     │
         AIRWAYS                PARENCHYMA
           CAUSES                  CAUSES
              │                     │
    - Bronchitis            - TB (cavitary)
    - Bronchiectasis        - Pneumonia
    - Lung cancer           - Lung abscess
    - Foreign body          - Aspergilloma
                                     
              VASCULAR CAUSES:
              - Pulmonary embolism
              - Mitral stenosis
              - AV malformation
              
              INFLAMMATORY CAUSES:
              - Granulomatosis with polyangiitis
              - Goodpasture syndrome

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Point-wise Memory Aid for Hemoptysis Causes

• M - Malignancy (lung cancer)
• A - Aspergilloma / AV malformation
• L - Left heart disease (mitral stenosis)
• T - TB (most common worldwide)
• P - Pneumonia / Pulmonary embolism
• I - Inflammatory (GPA, Goodpasture)
• G - Granulomatous disease
• S - Systemic bleeding disorders

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SYMPTOM 4: CHEST PAIN

Types in Respiratory Disease

• Sharp, stabbing pain
• Worsens with breathing, coughing, sneezing
• Improves with breath-holding or lying on the affected side
• Location: localized to area of inflammation
• Causes:
  • Pneumonia with pleuritis
  • Pulmonary embolism with infarction
  • Pneumothorax
  • Tuberculosis
  • Viral pleuritis

• Dull, aching, constant
• Not related to breathing
• Seen in: central airway tumors, mediastinal involvement

• From intercostal muscle strain (after severe coughing)
• Costochondritis
• Rib fractures

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Chest Pain Flowchart

            CHEST PAIN
                │
    Is it related to breathing?
         │              │
        YES              NO
    PLEURITIC        NON-PLEURITIC
         │              │
    Sharp/stabbing   Dull/aching
    Localized        Central
         │
    ┌────┴─────┐
 Sudden onset  Gradual onset
 + dyspnea     + fever + cough
    │               │
  PTX or PE      Pneumonia /
                  Pleuritis

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SYMPTOM 5: ABNORMAL BREATH SOUNDS / NOISES

Point-wise Summary

Key Exam Tip: Stridor = UPPER airway; Wheeze = LOWER airway

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Wheeze vs Stridor Flowchart

       ABNORMAL BREATHING SOUND
                │
        Where in breathing cycle?
         ┌──────┴──────┐
     EXPIRATORY      INSPIRATORY
         │                │
      WHEEZE           STRIDOR
         │                │
   Lower airway       Upper airway
   obstruction        obstruction
         │                │
  Asthma / COPD      Croup / FB /
  Cardiac asthma      Epiglottitis
                         ⚠️ EMERGENCY

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SYMPTOM 6: SPUTUM

Types and Clinical Meaning

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SYMPTOM 7: HOARSENESS

• Change in voice quality (rough, low-pitched voice)
• In respiratory disease, think of:
  • Recurrent Laryngeal Nerve (RLN) palsy from lung tumor compression
  • Upper airway tumor
  • Post-intubation laryngeal injury
• Important: Hoarseness + cough in a smoker = screen for lung cancer!

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COMPLETE SUMMARY FLOWCHART

    RESPIRATORY SYMPTOMATOLOGY - MASTER FLOWCHART
    
    ┌──────────────────────────────────────────────────┐
    │              PATIENT PRESENTATION                │
    └───────────────────────┬──────────────────────────┘
                            │
          ┌─────────────────┼─────────────────┐
          │                 │                 │
       COUGH             DYSPNEA          CHEST PAIN
          │                 │                 │
    ┌─────┴─────┐     ┌─────┴─────┐      ┌────┴────┐
  Acute      Chronic  Exertional  At     Pleuritic  Non-
 (<3wk)      (>8wk)     │         Rest       │     pleuritic
    │            │      │           │        │        │
  Viral       UACS   COPD/ILD    PND     PE/PTX   Tumor
  URTI       Asthma  Anemia    LV Fail  Pneumonia  Mass
             GERD
             
          │                 │                 │
       SPUTUM           HEMOPTYSIS        SOUNDS
          │                 │                 │
    Color tells you:   ┌────┴────┐      ┌─────┴──────┐
    - Clear = viral  Mild     Massive  Wheeze    Stridor
    - Yellow = bact  │         │         │          │
    - Rust = Pneumo Investigate EMERGENCY Lower    Upper
    - Pink = Edema  (TB? Ca?)  ⚠️        airway    airway
    - Foul = Abscess
    
    ┌─────────────────────────────────────────────────┐
    │              ALWAYS TAKE HISTORY:               │
    │  • Duration • Smoking • Occupation              │
    │  • Travel • Medications (ACE inhibitors)        │
    │  • Family history • Weight loss • Night sweats  │
    └─────────────────────────────────────────────────┘

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QUICK EXAM REVISION CARDS

Card 1: Duration of Cough

• Acute = < 3 weeks → Viral URTI
• Subacute = 3-8 weeks → Post-infectious
• Chronic = > 8 weeks → UACS / Asthma / GERD (top 3)

Card 2: Types of Dyspnea

• Orthopnea → Heart failure
• PND → LV failure
• Platypnea → Vascular shunt
• Exertional → COPD / Anemia / HF

Card 3: Hemoptysis Clues

• Young + no smoking → Infection (TB)
• Old + smoker → Lung Cancer

• 150 mL/24h → Massive = EMERGENCY

• Alkaline + bright red + frothy = Hemoptysis (not hematemesis)

Card 4: Sputum Colors

• Rust → Pneumococcal pneumonia
• Pink frothy → Pulmonary edema
• Foul-smelling → Lung abscess
• Black → Coal dust (pneumoconiosis)

Card 5: Wheeze vs Stridor

• Wheeze = expiratory, lower airway = Asthma/COPD
• Stridor = inspiratory, upper airway = EMERGENCY

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REFERENCES

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Study Tip for Exams: The most common respiratory complaint is dyspnea + cough. Hemoptysis, though less common, is high-yield because it has a clear differential based on patient age and smoking history. Always look for RED FLAGS in any cough presentation.

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🫁 COMMON RESPIRATORY DISEASES

Symptoms, Diagnosis & Treatment

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MASTER OVERVIEW TABLE

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1. ASTHMA

Definition

Symptoms

• Episodic wheezing (hallmark)
• Shortness of breath (SOB)
• Chest tightness
• Dry cough (especially at night and early morning)
• Symptoms worsen with triggers: cold air, exercise, allergens, smoke, dust
• Symptoms improve with bronchodilators (reversibility = key feature)

Triggers (Memorize)

Treatment - STEP-UP APPROACH

      STEP 1: Mild Intermittent
      → SABA (Salbutamol/Albuterol) as needed (PRN)
              ↓
      STEP 2: Mild Persistent
      → Low-dose Inhaled Corticosteroid (ICS)
        e.g. Budesonide, Beclomethasone
              ↓
      STEP 3: Moderate Persistent
      → Low-dose ICS + LABA
        (e.g. Salmeterol + Fluticasone)
              ↓
      STEP 4: Severe Persistent
      → High-dose ICS + LABA
              ↓
      STEP 5: Very Severe
      → Add oral corticosteroids / biologic
        (e.g. Omalizumab for allergic asthma)

• O2 supplementation
• Nebulized SABA (salbutamol) repeatedly
• IV/oral systemic corticosteroids
• IV Magnesium sulfate (severe cases)
• Intubation if refractory

"If asthmatic symptoms occur frequently, or if significant airflow obstruction persists despite bronchodilator therapy, inhaled corticosteroids should be started." - Katzung's Pharmacology 16E

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2. CHRONIC OBSTRUCTIVE PULMONARY DISEASE (COPD)

Definition

• Includes: Chronic Bronchitis (productive cough ≥ 3 months for 2 consecutive years) + Emphysema

Symptoms

• Progressive exertional dyspnea (main complaint)
• Chronic productive cough (especially in the morning)
• Sputum production (white/yellow)
• Barrel chest (emphysema)
• Pursed-lip breathing
• Cyanosis in advanced disease
• Reduced exercise tolerance
• Exacerbations (acute worsening - often triggered by infection)

COPD vs Asthma - Quick Comparison

Treatment (GOLD Guidelines)

• SABA - for acute relief (salbutamol)
• LABA (salmeterol, formoterol) - regular use for persistent symptoms
• LAMA (tiotropium) - long-acting anticholinergic; reduces exacerbations
• LABA + LAMA combination - for severe disease
• ICS - only in: severe obstruction OR frequent exacerbations OR high eosinophils
• Roflumilast (PDE4 inhibitor) - reduces exacerbation frequency
• Smoking cessation - single most important intervention
• Pulmonary rehabilitation

• Short-acting bronchodilators (SABA ± SAMA)
• Systemic corticosteroids (prednisolone)
• Antibiotics (routine - unlike asthma): beta-lactams, doxycycline, azithromycin
• Controlled O2 therapy (target SpO2 88-92% - avoid CO2 retention)
• Non-invasive ventilation (BiPAP) if hypercapnic

"The mortality of acute COPD exacerbations is greater than that of asthma exacerbations because of greater patient age and prevalence of comorbidities." - Katzung's Pharmacology 16E

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3. PNEUMONIA

Types

• Community-Acquired Pneumonia (CAP) - acquired outside hospital
• Hospital-Acquired (Nosocomial) Pneumonia - after 48h of hospitalization
• Aspiration Pneumonia - inhaled oral contents

Symptoms

• Fever (often high grade, chills, rigors)
• Productive cough - sputum (yellow/green or rust-colored in pneumococcal)
• Pleuritic chest pain (sharp, worsened by breathing)
• Dyspnea
• Tachycardia, tachypnea
• Dullness to percussion + bronchial breathing on exam

Sputum Color Clues

Treatment - CAP

       OUTPATIENT (Mild CAP):
       • Previously healthy, no antibiotics in past 3 months:
         → Amoxicillin 500mg TDS   OR
         → Azithromycin (macrolide)  OR
         → Doxycycline
       
       OUTPATIENT (With comorbidities):
       → Amoxicillin-Clavulanate + Macrolide  OR
       → Respiratory Fluoroquinolone
         (Levofloxacin, Moxifloxacin)
       
       INPATIENT (Non-ICU):
       → Beta-lactam + Macrolide  OR
       → Respiratory Fluoroquinolone
       
       INPATIENT (ICU / Severe):
       → Beta-lactam + Azithromycin + Fluoroquinolone
       → Add anti-MRSA (vancomycin) if MRSA risk

Macrolides or fluoroquinolones are used empirically since symptoms rarely differentiate among the various causes of CAP. - Goldman-Cecil Medicine

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4. TUBERCULOSIS (TB)

Causative Organism

Symptoms

• Chronic cough > 2-3 weeks (often with blood)
• Hemoptysis (blood in sputum)
• Night sweats (drenching, classic)
• Unexplained weight loss ("consumption")
• Low-grade fever (afternoon)
• Fatigue, loss of appetite
• In advanced disease: pleuritic chest pain, dyspnea

Classic Triad to Memorize

Chronic cough + Night sweats + Weight loss = TB until proven otherwise

Treatment - DOTS Regimen (Standard)

       PHASE 1: INTENSIVE PHASE (2 months)
       ┌─────────────────────────────────────┐
       │  R - Rifampicin (R)                 │
       │  H - Isoniazid (INH)                │
       │  E - Ethambutol                     │
       │  Z - Pyrazinamide                   │
       │  Mnemonic: "RHEZ" or "2RHZE"        │
       └─────────────────────────────────────┘
              ↓
       PHASE 2: CONTINUATION PHASE (4 months)
       ┌─────────────────────────────────────┐
       │  R - Rifampicin                     │
       │  H - Isoniazid                      │
       │  → "4RH"                            │
       └─────────────────────────────────────┘
       
       Total duration: 6 months (standard)
       MDR-TB: 18-24 months with second-line agents

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5. LUNG CANCER

Types

• Non-Small Cell Lung Cancer (NSCLC) - 85%: Adenocarcinoma, Squamous cell, Large cell
• Small Cell Lung Cancer (SCLC) - 15%: highly aggressive, paraneoplastic syndromes

Symptoms

• Persistent cough (new or changed)
• Hemoptysis (blood in sputum)
• Dyspnea / wheezing
• Chest pain (dull, constant - from chest wall invasion)
• Hoarseness (recurrent laryngeal nerve compression)
• Superior Vena Cava syndrome (facial swelling, arm swelling)
• Post-obstructive pneumonia (recurrent)

• Weight loss, anorexia
• Fatigue
• Bone pain (metastasis)
• Headache / neurological (brain metastasis)

• SIADH (hyponatremia)
• Cushing's syndrome (ACTH)
• Eaton-Lambert syndrome (myasthenia-like)

Treatment

       NSCLC:
       Stage I-II  → Surgery (resection) ± adjuvant chemo
       Stage III   → Chemoradiation
       Stage IV    → Chemotherapy (platinum-based)
                     Targeted therapy (EGFR, ALK inhibitors)
                     Immunotherapy (Pembrolizumab - PD-L1 high)
       
       SCLC:
       Limited stage → Chemoradiation
       Extensive     → Chemotherapy (etoposide + cisplatin)
                       + Immunotherapy

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6. PULMONARY EMBOLISM (PE)

Definition

Symptoms (Classic Triad)

• Sudden-onset dyspnea (most common)
• Pleuritic chest pain (from pulmonary infarction)
• Hemoptysis (from infarction)
• Tachycardia, tachypnea
• Signs of DVT: unilateral leg swelling, pain, redness
• In massive PE: hypotension, syncope, cardiac arrest

         WELLS SCORE (PE Probability)
         
    DVT symptoms                  +3
    No alternative diagnosis       +3
    HR > 100                       +1.5
    Immobilization / surgery (4wk) +1.5
    Prior DVT/PE                   +1.5
    Hemoptysis                     +1
    Malignancy                     +1
    
    Score > 4 = PE likely
    Score ≤ 4 = PE unlikely → D-dimer first

Treatment

       ACUTE PE:
       → Anticoagulation IMMEDIATELY
          • LMWH (enoxaparin) or
          • Unfractionated Heparin (UFH) for massive PE
       
       MASSIVE PE (hemodynamically unstable):
       → Thrombolysis (tPA - alteplase)
       → Surgical embolectomy (if thrombolysis fails)
       
       LONG-TERM:
       → DOACs (rivaroxaban, apixaban) - 3-6 months
       → Warfarin (target INR 2-3) - alternative

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7. PNEUMOTHORAX

Types

• Spontaneous (primary - tall young men; secondary - in COPD, asthma)
• Traumatic - rib fracture, penetrating wound
• Tension pneumothorax - EMERGENCY (air with one-way valve mechanism)

Symptoms

• Sudden, sharp unilateral chest pain
• Sudden onset dyspnea
• Reduced/absent breath sounds on affected side
• Tracheal deviation away (tension PTX only - emergency sign)
• Hypotension, tachycardia (tension)

Treatment

       Small PTX (<2cm, stable):
       → Observation + supplemental O2
       
       Moderate PTX (>2cm):
       → Needle aspiration (2nd intercostal space, 
         midclavicular line)  OR
       → Intercostal chest drain (5th ICS, 
         midaxillary line)
       
       TENSION PNEUMOTHORAX (EMERGENCY):
       → Immediate needle decompression
         (2nd ICS, MCL) - DO NOT WAIT FOR CXR
       → Then chest drain

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8. PLEURAL EFFUSION

Definition

Symptoms

• Dyspnea (proportional to fluid volume)
• Dull aching chest pain
• Reduced chest expansion on affected side
• Stony dull percussion (classic)
• Absent breath sounds
• Tracheal deviation away (large effusion)

Exudate vs Transudate (Light's Criteria)

Treatment

• Treat underlying cause
• Thoracocentesis (diagnostic and/or therapeutic drainage)
• Pleurodesis (for recurrent malignant effusions)

---

9. BRONCHIECTASIS

Definition

Symptoms

• Chronic, copious purulent sputum (hallmark - "3 cupfuls a day")
• Daily productive cough
• Recurrent respiratory infections
• Hemoptysis (can be massive)
• Dyspnea
• Clubbing of fingers (chronic cases)

Causes (Mnemonic "CATFISH")

Treatment

• Airway clearance techniques (chest physiotherapy, postural drainage) - cornerstone
• Antibiotics during exacerbations (guided by sputum culture)
• Long-term low-dose azithromycin (reduces exacerbations)
• Bronchodilators (if airflow obstruction)
• Surgery (resection) for localized disease

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10. INTERSTITIAL LUNG DISEASE (ILD) / PULMONARY FIBROSIS

Definition

• Key type: Idiopathic Pulmonary Fibrosis (IPF)

Symptoms

• Progressive exertional dyspnea (gradual, worsening)
• Dry, non-productive cough
• Fatigue
• Bibasilar fine crackles ("Velcro crackles" on auscultation)
• Clubbing of fingers
• Cyanosis (late)

Imaging

• CXR: Bilateral reticular (net-like) opacities, predominantly lower zones
• HRCT: "Honeycombing" pattern (advanced fibrosis)

Treatment

• Antifibrotic agents: Pirfenidone, Nintedanib (slow progression in IPF)
• Corticosteroids + immunosuppressants (for inflammatory ILDs: sarcoidosis, hypersensitivity pneumonitis)
• Lung transplantation (end-stage)
• Supplemental O2, pulmonary rehab

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11. INFLUENZA

Symptoms (Sudden Onset)

• High-grade fever (abrupt onset)
• Myalgia (severe muscle aches - distinguishes from common cold)
• Headache
• Dry cough
• Sore throat, runny nose
• Fatigue and malaise
• Complications: secondary bacterial pneumonia, myocarditis

Treatment

• Antiviral: Oseltamivir (Tamiflu) 75 mg BD x 5 days (within 48 hours of symptom onset)
• Supportive: Rest, fluids, paracetamol for fever
• Prevention: Annual influenza vaccination

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COMPLETE DISEASE FLOWCHART

    PATIENT WITH RESPIRATORY COMPLAINT
                    │
    ┌───────────────┼───────────────┐
    │               │               │
  COUGH           DYSPNEA       CHEST PAIN
    │               │               │
    ┌───────────────────────────────┐
    │         ASSESS:               │
    │  Duration / Onset / Character │
    │  Associated symptoms          │
    │  Smoking / Exposure history   │
    └───────────────────────────────┘
                    │
    ┌───────────────┼───────────────────────────┐
    │               │               │           │
  ACUTE          CHRONIC         ACUTE        GRADUAL
  ONSET          HISTORY         SEVERE       PROGRESSIVE
    │               │               │           │
   ↓               ↓               ↓           ↓
Pneumonia/      COPD/TB/        PE / PTX    COPD / ILD /
Influenza/      Lung Cancer/    / Asthma    Pulmonary HT
PE              Bronchiectasis  attack      / Lung Cancer
    │               │               │           │
    ↓               ↓               ↓           ↓
Antibiotics/    See Disease     Emergency   Stepwise
Antivirals      Specific Rx     Protocol    Long-term Rx

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DRUG CLASSES SUMMARY TABLE

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REFERENCES

1. Katzung's Basic and Clinical Pharmacology, 16th Edition - Treatment of Asthma and COPD
2. Fishman's Pulmonary Diseases and Disorders, 2-Volume Set - Approach to Respiratory Symptoms, Hemoptysis, PE
3. Murray & Nadel's Textbook of Respiratory Medicine, 2-Volume - Cough, Dyspnea, TB treatment
4. Harrison's Principles of Internal Medicine, 22nd Edition (2025) - Community-Acquired Pneumonia, Hemoptysis, Lung Cancer
5. Tintinalli's Emergency Medicine: A Comprehensive Study - Active TB Treatment, PE, Emergency Management
6. Goldman-Cecil Medicine International Edition - CAP Management, Diagnosis