Heart Failure Mimics: When should you suspect something else?
- Feb 7th, 2022
- Isabelle Piazza
Authors: Isabelle Piazza, MD (@isabelle_isii, EM Resident Physician, Papa Giovanni XXIII Hospital, Bergamo/University of Milan – Italy) and Roberto Cosentini, MD (@rob_cosentini, EM Attending Physician, Papa Giovanni XXIII Hospital, Bergamo- Italy) // Reviewed by: Jay Khadpe, MD; Alex Koyfman, MD (@EMHighAK)
A previously healthy 77-year-old male presents with dyspnea, palpitations and fatigue and a SpO2 of 92%. The ECG shows atrial flutter with 4:1/3:1 conduction. The chest X-ray demonstrates an enlarged cardiac silhouette with retro-cardiac reduction of lung transparency and a left pleural effusion. A transthoracic echocardiogram (TTE) displays an ejection fraction (EF) of 30%.
The patient was promptly treated with IV diuretics and O2 supplementation.
Heart failure (HF) is a clinical syndrome that results from any structural or functional impairment of ventricular filling or ejection of blood. The cardinal manifestations are dyspnea and fatigue, which may limit exercise tolerance, and fluid retention, which may lead to pulmonary, splanchnic congestion, and/or peripheral edema. There is not a single diagnostic test for HF because it is largely a clinical diagnosis based on a careful history and physical examination. In the emergency setting, it may be difficult to differentiate HF syndrome from other conditions that may present with a very similar clinical picture.
- Chronic obstructive pulmonary disease (COPD)
- Pulmonary embolism
- Acute Kidney Injury (AKI)
Criteria to identify an alternative diagnosis in patients with HF symptoms
1. Consideration of conditions that mimic HF is important: The following table summarizes the most relevant demographic and epidemiological features that might orient the initial differential.
Epidemiology Key Points
- Knowing the epidemiology is pivotal to estimate the pre-test probability of a disease.
- In the emergency department, we need to know the probability of a specific diagnosis according to gender, age group, ethnicity, geographical area, social and occupational history of the patient.
- Viral and bacterial infections are a major cause of lung disease and heart failure exacerbations.
- Always bear in mind specific populations portend specific risk factors (e.g. cancer, pregnancy, immobility).
2. Risk factors: The second step is to consider different personal risk factors that may refine the pretest probability of diagnosis.
Risk factor key points
- Alcohol and smoking are important risk factors for all of the diseases included in this differential.
- Occupational history may be helpful to support specific diagnoses.
- Pay attention to the possible triggers: infections, exposure to toxins or drugs (e.g. bronchospasm after taking aspirin or NSAIDs)
3. Clinical history and presentation: The third step is recognition of typical and pathognomonic clinical presentations that can immediately rule in or rule out conditions.
Clinical history key points
- Sometimes the distinction between COPD and asthma is unclear and this may be referred to as asthma-COPD overlap syndrome.
- Unlike airflow obstruction in COPD, airflow obstruction in asthma is completely reversible in most people, either spontaneously or with treatment.
- In case of pulmonary embolism, dyspnea and/or chest pain typically have a sudden onset, which is not always the case in COPD, pneumonia, or HF
- In acute kidney injury, pulmonary congestion and/or chest pain are usually associated with severe hypertension and/or hypervolemia
4. Physical examination: The fourth step is physical exam. The table discusses the findings with the highest discriminatory power.
Physical Exam Key Points
- During physical examination, asymmetrical chest expansion, diminished breath sounds, bronchophony, and tactile fremitus can be used in combination to accurately diagnose pneumonia and pleural effusion.
- Respiratory distress correlates with severity of illness more commonly in COPD exacerbations and acute cardiogenic pulmonary edema.Distress in asthmatic patients is an ominous sign of impending respiratory arrest.
- Rhonchi are the expression of accumulation of white blood cells, fluid, and proteins in the alveolar space usually due to infection.
- Inspiratory crackles, diminished breath sounds, and cardiac dullness have high diagnostic value for advanced obstructive airway disease.
- No physical sign performs with a high degree of accuracy for diagnosing early-stage chronic obstructive pulmonary disease.
- In acute kidney disease with severe metabolic acidosis, a deep and labored breathing pattern (Kussmaul breathing) may be present.
- Congestive heart failure can be differentiated from lung disease by the presence of jugular distention (low specificity) and presence of a third heart sound (high specificity).
5. ECG findings: The fifth step is the ECG, which isnonspecific but cheap. Always worth having a look as may display typical signs that corroborate specific diagnosis.
ECG Key Points
- S1Q3T3, new onset right axis deviation, and right bundle branch block (RBBB) are highly specific for pulmonary embolism.
- Left bundle branch block (LBBB) is very often associated with left heart disease.
- New onset atrial flutter or atrial tachycardia are usually associated with pneumonia or cor pulmonale.
- Atrial fibrillation and frequent premature contractions may be present in patients chronically treated with ß2-agonists.
- Acute ECG changes may occur in electrolyte disturbances (e.g. acute kidney disease).
6. Imaging: The sixth step is imaging. Several findings on imaging can assist.
Imaging Key Points
- In the acute setting, ultrasound is the first-choice bed-side diagnostic tool.
- Echocardiography is mandatory to evaluate the ventricular function and the inferior vena cava respiratory excursion.
- Chest X-ray is a low-cost exam that allows to exclude major conditions (typical pneumonia and pulmonary edema).
- In patients with asthma, the primary role of imaging is to detect complications rather than to help make the diagnosis.
7. Laboratory testing: Last but not least is laboratory analysis. In the following table, patterns of typical lab findings are categorized according to the different alternative diagnoses.
Laboratory Test Key Points
- For the diagnosis of CHF, both BNP and the biologically inactive NT-proBNP have similar accuracy.
- One major issue is that a large number of other etiologies can elevate natriuretic peptide levels:
- coronary syndromes
- valvular heart disease
- pericardial disease
- atrial fibrillation
- cardiac surgery
- older age
- renal failure
- pulmonary hypertension
- critical illness
- Elevated BMI actually decreases natriuretic levels.
- Angiotensin Receptor Neprilysin Inhibitor (ARNI) increases BNP levels but not NT-proBNP levels.
- D-dimer cut-off values should be adjusted for age or clinical probability.
- COPD patients have increased risk for hepatobiliary diseases and asymptomatic elevations of hepatic transaminases, which have relatively low prevalence.
- Renal complications of COPD are common especially among patients with hypoxemia and hypercapnia.
- Nasopharygneal testing for COVID-19 and urinary antigen testing for Legionella app or S. Pneumoniae are useful to identify the underlying pathogen in cases of suspected pneumonia, COPD, and asthma exacerbations.
- In general lactate is a marker of imbalance between tissue oxygen supply and demand, and consequently may indicate overt or imminent hemodynamic compromise in cases of severe pulmonary embolism
Other rare diseases that could mimic heart failure in the emergency setting include:
-Interstitial lung disease (i.e. sarcoidosis, asbestosis, hypersensitivity pneumonitis, cryptogenic organizing pneumonia)
-Chronic infections (i.e. HIV, TBC, etc.)
-Vasculitis with pulmonary involvement
-Collagen vascular diseases
-Mechanical constrictions secondary to neoplastic infiltration
The patient didn’t improve with diuretics, and the cardiologist repeated the echo. He confirmed the reduced ejection fraction of left ventricle (30%), but with an impaired filling due to a mass adjacent to the left ventricle free wall and apex (orange arrow).
A cardiac magnetic resonance revealed a solid mass with necrotic areas sized 96 x 45 mm infiltrating the anterior-lateral and apical wall of left ventricle. A definite diagnosis of diffuse large B-cell lymphoma was made by echo-guided biopsy. After staging (Ann Arbor IV A), the patient underwent six cycles of R-COMP chemotherapy without any major side effects.
At six months follow-up, the heart failure symptoms completely resolved and the EF normalized.
In this case the HF symptoms were the first clinical presentation of a neoplastic infiltration.
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