History to Elicit for Exertional Dyspnea
When evaluating exertional dyspnea, obtain a detailed characterization of the symptom itself, assess for cardiac versus pulmonary etiologies through specific associated symptoms, identify risk factors and exposures, and quantify functional limitation using standardized classification systems.
Core Symptom Characteristics
Characterize the dyspnea with specific descriptive qualities, onset pattern, frequency, severity, and the precise activities that provoke symptoms 1. Exertional dyspnea is the most frequent presenting symptom in pulmonary arterial hypertension, occurring in 60% of patients initially and eventually in virtually all patients as disease progresses 2. Determine whether dyspnea occurs only with exertion or has progressed to occur at rest, as this indicates disease severity 2.
Cardiac-Specific History
Inquire specifically about orthopnea, paroxysmal nocturnal dyspnea, and edema—these symptoms suggest elevated pulmonary venous pressure and left-sided cardiac disease 2. Ask about anginal chest pain and syncope, which are each reported by approximately 40% of patients with pulmonary arterial hypertension during their disease course 2. Document any history of palpitations, arrhythmias, or abnormal heart rhythms 2.
Pulmonary-Specific History
Obtain detailed smoking history including pack-years and current status 2. For patients over 50 years of age who are long-term smokers or ex-smokers with chronic breathlessness on minor exertion (such as walking on level ground), assume COPD until proven otherwise 2. Ask about snoring or witnessed apneas, as sleep-disordered breathing can be a causative or contributory factor 2.
Associated Symptoms and Comorbidities
Document symptoms of connective tissue disease including Raynaud phenomenon, arthralgias, or swollen hands, as these raise the possibility of pulmonary arterial hypertension related to connective tissue disease 2. Inquire about leg swelling, abdominal bloating and distension, anorexia, and profound fatigue, which develop as right ventricular dysfunction and tricuspid regurgitation evolve 2.
Exposure and Medication History
Explore potential toxic exposures including appetite suppressants, toxic rapeseed oil, or chemotherapeutic agents (mitomycin-C, carmustine, etoposide, cyclophosphamide, bleomycin) 2. Document known or suspected HIV exposure 2. Review all current medications and supplements 3.
Family History
Ask specifically whether other family members have had symptoms or an established diagnosis of pulmonary arterial hypertension or connective tissue disease, as there is a recognized genetic component 2.
Functional Capacity Assessment
Use the World Health Organization classification system to quantify activity limitation 2:
- Class I: No limitation of usual physical activity
- Class II: Mild limitation; normal activity causes increased dyspnea, fatigue, chest pain, or presyncope
- Class III: Marked limitation; less than ordinary activity causes symptoms
- Class IV: Unable to perform any physical activity at rest; may have signs of right ventricular failure
Conditions Requiring Special Consideration
Identify patients at risk for hypercapnic respiratory failure, including those with severe kyphoscoliosis, severe ankylosing spondylitis, severe lung scarring from tuberculosis, morbid obesity (BMI >40 kg/m²), neuromuscular disorders with wheelchair use, or those on home mechanical ventilation 2.
Exercise-Specific Details
For suspected exercise-induced bronchoconstriction, determine the specific timing of symptoms relative to exercise (during versus after), environmental conditions (cold air, indoor versus outdoor), and whether symptoms resolve with rest 2. Ask about accompanying systemic symptoms like pruritus, urticaria, or hypotension that might suggest exercise-induced anaphylaxis rather than bronchoconstriction 2.
Common Pitfalls to Avoid
Do not assume asthma in older smokers with chronic dyspnea—patients with COPD may mistakenly use the term "asthma" to describe their condition 2. Recognize that dyspnea etiology is multifactorial in approximately one-third of patients 3. Be aware that clinical presentation alone is adequate to make a diagnosis in only 66% of patients with dyspnea, so systematic history-taking is essential 3.