One-liner#

Systematically evaluate exertional dyspnea to distinguish cardiac (HF, CAD, valvular) from pulmonary (COPD, asthma, ILD) and other causes (anemia, deconditioning, obesity), using history and targeted workup to guide management.

Quick nav#

• Red flags / send to ED
• Key history
• Focused exam
• Differential (quick pattern recognition)
• Workup
• Initial management
• Management by diagnosis
• Follow-up
• Patient instructions
• Smartphrase snippets

Red flags / send to ED#

• Dyspnea at rest or with minimal exertion (new or acutely worsened)
• Hypoxia (O2 sat <92% on room air)
• Acute chest pain with dyspnea (ACS, PE, pneumothorax)
• Hemodynamic instability: hypotension, tachycardia with poor perfusion
• Severe respiratory distress: accessory muscle use, inability to speak in sentences
• Acute decompensated HF: orthopnea, PND, rapid weight gain, crackles, JVD
• Suspected PE: sudden onset, pleuritic pain, tachycardia, VTE risk factors
• Stridor or upper airway obstruction
• Syncope or presyncope with exertion (consider severe AS, HCM, arrhythmia)

Key history#

Characterize the dyspnea:

• Onset: acute (days) vs subacute (weeks) vs chronic (months-years)
• Progression: stable, slowly progressive, or rapidly worsening
• Triggers: exertion level (flights of stairs, walking distance, ADLs)
• Quantify functional limitation: NYHA class or specific activities
• Associated symptoms: chest pain, palpitations, cough, wheeze, leg swelling, orthopnea, PND

NYHA Functional Classification:

• Class I: No limitation; ordinary activity doesn’t cause symptoms
• Class II: Slight limitation; comfortable at rest; ordinary activity causes symptoms
• Class III: Marked limitation; comfortable at rest; less than ordinary activity causes symptoms
• Class IV: Unable to carry on any activity without symptoms; symptoms at rest

Cardiac clues:

• Orthopnea (how many pillows?), PND
• Leg swelling, weight gain
• Chest pressure with exertion
• Palpitations, lightheadedness
• Known CAD, HF, valvular disease, arrhythmia

Pulmonary clues:

• Cough (productive vs dry), wheeze
• Smoking history (pack-years)
• Occupational/environmental exposures
• Known COPD, asthma, ILD
• Seasonal or allergic triggers

Other systemic clues:

• Fatigue, pallor (anemia)
• Weight changes, heat/cold intolerance (thyroid)
• Muscle weakness (neuromuscular)
• Anxiety, panic symptoms
• Recent deconditioning, weight gain, sedentary lifestyle

Medications that can cause/worsen dyspnea:

• Beta-blockers (bronchospasm in reactive airways)
• NSAIDs (fluid retention, bronchospasm)
• Amiodarone (pulmonary toxicity)
• Methotrexate, bleomycin (pulmonary fibrosis)

Focused exam#

• Vitals: BP, HR, RR, O2 sat (at rest; consider with ambulation if normal at rest), weight
• General: respiratory distress, ability to speak in full sentences, cyanosis, pallor
• Cardiac: JVD, displaced PMI, S3 (HF), S4, murmurs (AS, MR), irregular rhythm
• Pulmonary: breath sounds (decreased, crackles, wheezes, rhonchi), percussion (dullness = effusion)
• Extremities: peripheral edema, cyanosis, clubbing
• Abdomen: hepatomegaly, ascites, hepatojugular reflux
• Skin: pallor (anemia), cyanosis

Provocative testing in office:

• Walk patient in hallway; check O2 sat before and after
• Desaturation >4% or to <90% is significant

Differential (quick pattern recognition)#

Common/likely (outpatient)#

Can’t-miss / urgent#

Workup#

Initial workup (most patients):

• ECG: LVH, ischemic changes, arrhythmia, RV strain pattern
• CXR: cardiomegaly, pulmonary edema, effusions, hyperinflation, ILD pattern
• BNP or NT-proBNP: elevated in HF
  • BNP <100 or NT-proBNP <300: HF unlikely
  • BNP >400 or NT-proBNP >900: HF likely
  • Gray zone (BNP 100–400): consider echo; may be HFpEF, pulmonary HTN, renal dysfunction, or non-cardiac
• CBC: anemia
• BMP: renal function (cardiorenal syndrome), electrolytes
• TSH: hyper/hypothyroidism

Second-tier based on initial findings:

• Echo: if BNP elevated, murmur, suspected HF, or unexplained dyspnea
• Spirometry: if pulmonary cause suspected (smoking, wheeze, chronic cough)
• Stress testing: if CAD suspected (exertional symptoms, risk factors, normal BNP)

When to order what:

Ambulatory O2 saturation:

• If resting O2 sat normal but significant exertional symptoms
• 6-minute walk test with continuous oximetry
• Desaturation to <88% may qualify for supplemental O2

When NOT to do extensive workup:

• Clear deconditioning in young, healthy patient with normal exam and vitals
• Known stable COPD/asthma at baseline without acute change
• Anxiety with classic features after appropriate initial screening

Mixed cardiac and pulmonary disease:

• Common scenario: patient has both COPD and HF
• BNP may be elevated in cor pulmonale from COPD
• Echo helps: low EF = HFrEF; preserved EF with diastolic dysfunction + elevated filling pressures = HFpEF
• Spirometry helps quantify pulmonary contribution
• Often need to treat both; optimize one and reassess

Referral urgency:

• Urgent cardiology (1–2 weeks): new HF diagnosis, EF <40%, suspected severe valvular disease, exertional syncope
• Routine cardiology (4–6 weeks): stable HF for GDMT optimization, borderline echo findings
• Urgent pulmonology (1–2 weeks): suspected ILD, rapidly progressive symptoms, hypoxia
• Routine pulmonology (4–6 weeks): COPD for optimization, asthma not controlled on step 3 therapy

Initial management#

• Treat the underlying cause (see Management by diagnosis)
• Hypoxia: supplemental O2 to maintain sat >90%
• Acute HF: diuretics, salt/fluid restriction
• Suspected CAD: optimize risk factors; stress testing
• COPD/asthma: bronchodilators; inhaler technique review

Management by diagnosis#

Heart failure (HFrEF)#

Education:

• Heart isn’t pumping efficiently; fluid backs up into lungs and legs
• Daily weights are critical—call if gain >2–3 lbs/day or >5 lbs/week
• Medications improve symptoms AND prolong life; don’t stop without discussing
• Salt and fluid restriction help reduce fluid buildup

Treatment:

Non-pharmacologic:

• Sodium restriction: <2 g/day
• Fluid restriction: 1.5–2 L/day if hyponatremic or refractory
• Daily weights; call if rapid gain
• Cardiac rehab referral
• Smoking cessation

Guideline-directed medical therapy (GDMT):

Diuretics (for congestion):

Follow-up: 1–2 weeks after diuretic changes; cardiology co-management for GDMT optimization.

Heart failure (HFpEF)#

Education:

• Heart pumps normally but is stiff and doesn’t fill well
• Symptoms similar to other heart failure; treatment focuses on symptoms and underlying conditions
• Control blood pressure, treat AFib, manage fluid

Treatment:

Non-pharmacologic:

• Same as HFrEF: sodium restriction, daily weights, cardiac rehab

Pharmacologic:

Treat underlying conditions:

• Aggressive BP control
• Rate/rhythm control for AFib
• Weight loss if obese
• Treat OSA

Follow-up: 2–4 weeks; cardiology referral for management optimization.

COPD#

Education:

• Lung damage from smoking makes it hard to move air out
• Inhalers open airways and reduce inflammation; use daily even when feeling well
• Smoking cessation is the only thing that slows disease progression
• Pulmonary rehab improves exercise tolerance and quality of life

Treatment:

Non-pharmacologic:

• Smoking cessation (most important intervention)
• Pulmonary rehabilitation
• Vaccinations: influenza annually, pneumococcal, COVID-19, Tdap, RSV (age ≥60)
• Supplemental O2 if resting sat ≤88% or exertional desaturation

Pharmacologic (GOLD guidelines):

Stepped approach:

1. LAMA or LABA monotherapy (LAMA preferred)
2. LAMA + LABA if persistent symptoms
3. Add ICS if eosinophils ≥300 or frequent exacerbations
4. Consider roflumilast, azithromycin for frequent exacerbators

Follow-up: 4–8 weeks after starting/changing therapy; annual spirometry; pulmonology referral for severe or frequently exacerbating COPD.

Asthma#

Education:

• Airways are inflamed and reactive; triggers cause narrowing and symptoms
• Controller inhalers reduce inflammation; use daily even when feeling well
• Rescue inhaler for acute symptoms; if using >2x/week, control is inadequate
• Identify and avoid triggers

Treatment:

Non-pharmacologic:

• Trigger avoidance (allergens, irritants, NSAIDs if sensitive)
• Smoking cessation
• Weight loss if obese
• Vaccinations: influenza, COVID-19

Pharmacologic (GINA guidelines):

Step therapy:

1. PRN ICS-formoterol (preferred) or PRN SABA + low-dose ICS
2. Low-dose ICS-LABA daily
3. Medium-dose ICS-LABA
4. High-dose ICS-LABA; consider add-ons (tiotropium, biologics)
5. Refer to pulmonology/allergy for severe asthma

Follow-up: 4–6 weeks after starting/changing therapy; assess control with ACT score; pulmonology/allergy referral for uncontrolled or severe asthma.

Anemia#

Education:

• Low red blood cells mean less oxygen delivery to tissues, causing fatigue and breathlessness
• Treatment depends on the cause; iron deficiency is most common and treatable
• Finding the cause is important—may need further testing

Treatment:

Iron deficiency anemia:

Investigate underlying cause:

• Premenopausal women: heavy menses common; GI workup if no clear source
• Men and postmenopausal women: GI workup (EGD/colonoscopy) to rule out occult GI bleed
• Consider celiac disease if malabsorption suspected

Follow-up: Reticulocyte count at 1–2 weeks (should increase); Hgb at 4–8 weeks; continue iron 3–6 months after Hgb normalizes to replete stores.

Deconditioning#

Education:

• Being out of shape makes the heart and lungs work harder with activity
• Exercise improves fitness; start slowly and build up gradually
• Weight loss (if overweight) significantly improves symptoms
• This is reversible with consistent effort

Treatment:

Non-pharmacologic:

• Structured exercise program: start with 10–15 min walking, increase gradually
• Goal: 150 min/week moderate-intensity aerobic activity
• Cardiac rehab referral if underlying cardiac disease
• Weight loss if BMI >25: even 5–10% weight loss improves symptoms
• Address barriers: joint pain, depression, access

When to refer:

• Cardiac rehab if any cardiac history
• Pulmonary rehab if any pulmonary disease
• Bariatric surgery evaluation if BMI >40 or >35 with comorbidities

Follow-up: 4–8 weeks to assess progress; encourage and adjust exercise prescription.

Follow-up#

• HF: 1–2 weeks after diuretic changes; cardiology co-management
• COPD/asthma: 4–8 weeks after starting/changing therapy
• Anemia: 4–8 weeks for Hgb recheck
• Deconditioning: 4–8 weeks to assess exercise progress
• Unexplained dyspnea: 2–4 weeks after initial workup; consider pulmonology/cardiology referral

Return precautions (all patients):

• Worsening shortness of breath, especially at rest
• Chest pain or pressure
• Rapid weight gain (>2–3 lbs/day)
• Lightheadedness or fainting
• Coughing up blood
• Fever with worsening breathing

Patient instructions#

• Take your medications as prescribed, even if you feel well.
• If you have heart failure: weigh yourself every morning; call if you gain more than 2–3 pounds in a day or 5 pounds in a week.
• If you use inhalers: use your controller inhaler every day; keep your rescue inhaler with you.
• Stay active within your limits; regular exercise improves breathing over time.
• If you smoke, quitting is the most important thing you can do for your lungs.
• Reduce salt intake if you have heart failure or high blood pressure.
• Get your flu shot every year and stay up to date on pneumonia and COVID vaccines.
• Seek immediate care for sudden worsening of breathing, chest pain, or coughing up blood.

Smartphrase snippets#

• Dyspnea on exertion, HF: Exertional dyspnea with [orthopnea/PND/edema]. BNP [X]. Echo shows [EF/findings]. Initiated/optimized GDMT: [medications]. Discussed daily weights, sodium restriction, return precautions. Cardiology referral placed. Follow-up [interval].

• Dyspnea on exertion, COPD: Chronic exertional dyspnea in [X] pack-year smoker. Spirometry shows [FEV1/FVC, FEV1 % predicted]. Started [LAMA/LABA/ICS]. Smoking cessation counseled. Pulmonary rehab referral. Follow-up [interval].

• Dyspnea on exertion, deconditioning: Exertional dyspnea in setting of [sedentary lifestyle/weight gain]. Cardiac and pulmonary workup unremarkable. Counseled on structured exercise program starting with [X]. Weight loss discussed. Follow-up [interval] to assess progress.

Coding/billing notes#

• Document functional class (NYHA) or specific activity limitations
• Document O2 saturation at rest and with exertion if checked
• Document cardiac and pulmonary exam findings
• For HF: document volume status, BNP, echo findings
• For COPD/asthma: document spirometry results, smoking history
• If not pursuing extensive workup, document rationale

Related pages#

Complaint pages#

• Edema (complaint) — overlapping presentation with HF-related dyspnea
• Chest Pain (complaint) — cardiac causes may present with both symptoms
• Palpitations (complaint) — arrhythmia can cause dyspnea

Problem pages#

• Heart Failure (problem) — comprehensive HFrEF/HFpEF management, GDMT optimization, diuretic strategies
• Coronary Artery Disease (problem) — stable angina, secondary prevention
• Atrial Fibrillation (problem) — rate/rhythm control, anticoagulation

Future problem pages to be linked:

• COPD — chronic obstructive pulmonary disease management
• Asthma — asthma management
• Anemia — iron deficiency and other anemias