Here is a structured clinical guide to taking a history of breathlessness (dyspnoea):
History of Breathlessness
1. Definition & Opening
Dyspnoea is the subjective, uncomfortable awareness of breathing. Patients use varied terms — "tightness," "suffocating," "can't get enough air," "heavy breathing," "unable to take a deep breath." Always use the patient's own language to confirm you are discussing the same symptom.
2. Onset & Duration
| Feature | Details to Elicit |
|---|
| Onset | Sudden vs. gradual |
| Duration | Hours, days, weeks, months |
| Course | Progressive, intermittent, or stable |
- Acute dyspnoea suggests: pulmonary oedema, pulmonary embolism, pneumothorax, pneumonia, acute asthma, foreign body, vocal cord dysfunction
- Chronic progressive dyspnoea suggests: COPD, left ventricular failure, interstitial fibrosis, pulmonary vascular disease, pleural effusion, severe anaemia
3. Severity — Functional Grading
Quantify exercise tolerance carefully. Patients often adapt by slowing down without realising it.
Ask:
- How far can you walk on the flat at your own pace before stopping?
- How many stairs before you must stop?
- Does dressing, eating, or talking on the phone cause breathlessness?
- Are you breathless at rest?
MRC Dyspnoea Scale (commonly used):
| Grade | Description |
|---|
| 1 | Only on strenuous exercise |
| 2 | Hurrying on level ground or walking up slight hill |
| 3 | Slower than most on level, or stops after ~100 m |
| 4 | Stops after ~100 yards; unable to leave the house |
| 5 | Too breathless to leave house / breathless when dressing |
Modified Borg Scale (0–10) may also be used to rate intensity of sensation at a given moment.
4. Precipitating & Relieving Factors
| Factor | Implication |
|---|
| Exercise | Universal; assess threshold |
| Lying flat (orthopnoea) | Left ventricular failure, bilateral diaphragm palsy, COPD |
| Waking from sleep (PND) | Left ventricular failure (classically); also COPD (pooling of secretions), nocturnal aspiration |
| Upright position (platypnoea) | Pulmonary vascular shunting (hepatopulmonary syndrome, PFO) |
| Lateral decubitus (trepopnea) | Unilateral lung or pleural disease |
| Triggers: smoke, dust, moulds, perfumes | Asthma, occupational/hypersensitivity disease |
| Relieved by bronchodilator | Asthma / COPD |
| Relieved by sitting up | Cardiac failure |
Key questions:
- How many pillows do you sleep on? (orthopnoea — quantify)
- Do you ever wake at night fighting for breath? (PND)
5. Character / Quality of Sensation
Descriptors can narrow the differential:
| Descriptor | Likely Cause |
|---|
| "Chest tightness" | Asthma, myocardial ischaemia |
| "Air hunger / suffocation" | Pulmonary oedema, severe hypoxia |
| "Can't take a deep breath" | COPD with hyperinflation |
| "Heavy breathing" | Deconditioning |
| "Throat closing" | Anaphylaxis, vocal cord dysfunction |
(No single descriptor is pathognomonic — use in context.)
6. Associated Symptoms
| Symptom | Suggests |
|---|
| Wheeze | Asthma, COPD, cardiac asthma (pulmonary oedema) |
| Productive cough | Infection, bronchiectasis, COPD |
| Haemoptysis | PE, malignancy, TB, bronchiectasis |
| Ankle swelling / orthopnoea | Cardiac failure |
| Fever / rigors | Pneumonia, infective exacerbation |
| Chest pain (pleuritic) | PE, pneumothorax, pleurisy |
| Chest pain (central/crushing) | Acute coronary syndrome |
| Palpitations | Arrhythmia driving dyspnoea |
| Dizziness / light-headedness | Hyperventilation, anaemia, arrhythmia |
| Weight loss | Malignancy, severe COPD |
7. Background History
Past medical history:
- Cardiac disease (heart failure, IHD, valve disease)
- Respiratory disease (asthma, COPD, TB, previous PE/DVT)
- Anaemia (Hb <6–7 g/dL can cause exertional dyspnoea)
- Neuromuscular disease (respiratory muscle weakness)
- Renal disease (pulmonary oedema, anaemia)
Drug history:
- Amiodarone, methotrexate, nitrofurantoin → pulmonary fibrosis
- Beta-blockers → worsen asthma/COPD
- ACE inhibitors → cough (may be confused with breathlessness)
- Aspirin, progesterone → increased minute ventilation
- NSAIDs → aspirin-sensitive asthma
Smoking history: Pack-years (COPD, malignancy risk)
Occupational / environmental history: Asbestos, coal, silica, birds, fungi → asbestosis, COPD, hypersensitivity pneumonitis
Family history: Asthma, alpha-1 antitrypsin deficiency, pulmonary hypertension
8. Functional Impact
- Impact on daily activities, work, sleep
- Anxiety or panic (psychogenic dyspnoea / hyperventilation syndrome — consider if symptoms at rest improve with activity, or are accompanied by paraesthesiae, light-headedness, palpitations)
9. Systems Review Pointers
- Diabetic → Kussmaul breathing / DKA (metabolic dyspnoea)
- Thyrotoxicosis, fever, pregnancy → increased ventilatory drive
- Generalised muscle weakness → neuromuscular respiratory failure
Summary of Key Differentials by Pattern
| Pattern | Think of |
|---|
| Acute, sudden onset | PE, pneumothorax, acute LVF, asthma attack |
| Subacute (days–weeks) | Pneumonia, pleural effusion, exacerbation of COPD/CCF |
| Chronic progressive | COPD, heart failure, IPF, pulmonary hypertension, malignancy, anaemia |
| Episodic/paroxysmal | Asthma, arrhythmia, hyperventilation, PND |
| Postural | Orthopnoea → LVF; platypnoea → shunt; trepopnea → unilateral lung disease |
Sources: Fishman's Pulmonary Diseases and Disorders, 2-Volume Set, pp. 430–437; Murray & Nadel's Textbook of Respiratory Medicine, 2-Volume, pp. 3486–3497