Differential Diagnosis for Bilateral Pedal Edema with Shortness of Breath and Decreased Urine Output

Primary Cardiac Causes

The American College of Cardiology recommends considering congestive heart failure (both systolic and diastolic) as a critical diagnosis given the combination of bilateral pedal edema, dyspnea, and decreased urine output 1, 2, 3
Heart failure with preserved ejection fraction (HFpEF) is common in patients with chronic smoking and alcohol use, presenting with orthopnea, paroxysmal nocturnal dyspnea, and bilateral edema 1, 2, 6
Physical examination should specifically assess for jugular venous distention, S3 gallop, and pulmonary rales—these findings strongly suggest CHF even without prior cardiac history 4, 5, 3
The European Society of Cardiology guidelines classify acute heart failure patients as "wet and cold" (hypoperfused and congested) when presenting with both edema and decreased urine output, indicating more severe disease 3

The American College of Cardiology identifies kidney failure as a primary noncardiovascular mimic of heart failure that presents with dyspnea and edema 1, 2, 6
Urinalysis should assess for proteinuria to evaluate for nephrotic syndrome, which causes edema through hypoalbuminemia 4, 5, 2
Chronic renal failure is a specific risk factor for fluid retention and heart failure development 4, 5

Cirrhotic liver disease is highly relevant given chronic alcoholism, presenting with ascites, peripheral edema, and potential hepatorenal syndrome 1, 2
Abdominal ultrasound should assess for cirrhosis and ascites as part of the evaluation 1, 2, 6

Chronic obstructive pulmonary disease (COPD) with cor pulmonale must be considered in chronic smokers presenting with dyspnea and edema 4, 5, 2
Pulmonary evaluation with chest imaging, spirometry, and arterial blood gas should be performed 1, 2, 6
Lung disease with or without cor pulmonale is a recognized noncardiac mimic of heart failure 1, 2, 6

Brain natriuretic peptide (BNP) levels—elevated BNP warrants echocardiography to assess for heart failure 4, 5
ECG to identify silent myocardial infarction or left ventricular hypertrophy 4, 5
Chest X-ray to assess for cardiomegaly, pulmonary congestion, pleural effusion, or alternative pulmonary pathology 3
Echocardiogram if BNP elevated or clinical suspicion for heart failure 4, 5, 3
Urinalysis with protein/creatinine ratio to assess for nephrotic syndrome 1, 2