Initial Approach to Managing a Patient with Dyspnea

Immediate Clinical Assessment

The European Society of Cardiology recommends beginning with immediate assessment of clinical severity using vital signs and respiratory status, followed by concurrent diagnostic evaluation and treatment initiation based on blood pressure and congestion patterns 1
Measure respiratory rate, assess intolerance of supine position, effort of breathing, and degree of hypoxia to objectively quantify dyspnea severity 1
Record systolic and diastolic blood pressure immediately, as this drives initial treatment decisions 1
Document heart rate, rhythm, and body temperature 1
Assess for signs of hypoperfusion: cool extremities, narrow pulse pressure, altered mental status 1
Initiate non-invasive monitoring within minutes: pulse oximetry, blood pressure, respiratory rate, continuous ECG 1

Systematically evaluate for volume overload by examining for peripheral edema, audible rales, and elevated jugular venous pressure 1
Consider bedside thoracic ultrasound for interstitial edema if expertise available - B-lines indicate pulmonary edema 1
Perform abdominal ultrasound to assess inferior vena cava diameter and ascites 1

Obtain a 12-lead ECG, as it is rarely normal in acute heart failure, and is necessary to exclude ST-elevation MI 1
Perform a chest radiograph to rule out alternative causes, though it may be normal in nearly 20% of cases 1, 2
The American Journal of Respiratory and Critical Care Medicine suggests that laboratory tests, including relevant biomarkers, should be obtained immediately and concomitantly with clinical assessment 1

Initiate treatment based on blood pressure and degree of congestion using vasodilators and/or diuretics (furosemide) 1
If systolic blood pressure >140 mmHg with congestion, vasodilators are appropriate 1
If signs of volume overload are present, loop diuretics (furosemide) should be used 1
Oxygen therapy should be given based on clinical judgment unless oxygen saturation <90%, in which case it should be administered routinely 1
Non-invasive ventilation should be used for patients with respiratory distress 1

The American Journal of Respiratory and Critical Care Medicine recommends that the initial focus should be on optimizing treatment of the underlying disease 4
For heart failure, optimize diuretics and afterload reduction 4
For obstructive airway disease, optimize inhaled bronchodilators and corticosteroids 4

If initial evaluation doesn't reveal the cause, second-line testing includes pulmonary function testing/spirometry, echocardiography, CT chest, and brain natriuretic peptide testing 1, 2

Do not delay treatment while awaiting complete diagnostic workup, as the "time-to-treatment" concept is critical in acute heart failure 1
Do not assume chest radiograph rules out pathology, as it may be normal in nearly 20% of acute heart failure cases 1
Do not routinely order immediate echocardiography unless hemodynamic instability is present 1
Recognize that dyspnea etiology is multifactorial in approximately one-third of patients, with the most common causes being cardiac and pulmonary 4