Blood Work
CBC
BMP
Mg
LFT
BNP
Troponin
Blood gas
Inflammatory markers such as ESR/CRP if concern for myocarditis, although these are nonspecific
CBC
BMP
Mg
LFT
BNP
Troponin
Blood gas
Inflammatory markers such as ESR/CRP if concern for myocarditis, although these are nonspecific
EKG
Sinus tachycardia - most common
May find other etiologies to CHF such as ECG abnormalities pointing towards myocarditis, restrictive cardiomyopathy, heart block, arrhythmias
Sinus tachycardia - most common
May find other etiologies to CHF such as ECG abnormalities pointing towards myocarditis, restrictive cardiomyopathy, heart block, arrhythmias
CXR
Will help assess for cardiomegaly, pulmonary congestion, interstitial edema, pleural effusions
Will help assess for cardiomegaly, pulmonary congestion, interstitial edema, pleural effusions
Echocardiography
Definitive diagnosis typically via echocardiography
A lines and B lines
A lines:
Appear as horizontal lines
Indicate dry interlobular septa.
Predominance of A lines has 90% sensitivity, 67% specificity for pulmonary artery wedge pressure <= 13mm Hg
A line predominance suggests that intravenous fluids may be safely given without concern for pulmonary edema
B lines ("comets"):
White lines from the pleura to the bottom of the screen
Highly sensitive for pulmonary edema, but can be present at low wedge pressures
A lines:
Appear as horizontal lines
Indicate dry interlobular septa.
Predominance of A lines has 90% sensitivity, 67% specificity for pulmonary artery wedge pressure <= 13mm Hg
A line predominance suggests that intravenous fluids may be safely given without concern for pulmonary edema
B lines ("comets"):
White lines from the pleura to the bottom of the screen
Highly sensitive for pulmonary edema, but can be present at low wedge pressures
Appear as horizontal lines
Indicate dry interlobular septa.
Predominance of A lines has 90% sensitivity, 67% specificity for pulmonary artery wedge pressure <= 13mm Hg
A line predominance suggests that intravenous fluids may be safely given without concern for pulmonary edema
White lines from the pleura to the bottom of the screen
Highly sensitive for pulmonary edema, but can be present at low wedge pressures
Congestive heart failure 
Airway obstruction
Lung transplant complications
Anaphylaxis, angioedema
High-output heart failure
Aspirated foreign body
Cirrhosis
Asthma exacerbation