CBC (polycythemia)
ABG (oxygenation, acid-base status)
α-1-antitrypsin
ANA
Coagulation studies (protein C/S, factor V Leiden etc)
Enlarged pulmonary arteries
Cardiomegaly
Decreased retrosternal air space
RVH
Right axis deviation
Right bundle branch block
R:S ratio > 1 in V1
TWI in V1-3 in acute right heart strain
S1 Q3 T3 in acute right heart strain
Large P wave in II, III, aVF
Arrhythmia (PAC, SVT, MFAT, A-fib, A-flutter)
Increased RV thickness
RV dilation
Tricuspid insufficiency
High estimated PA pressures
Septal bowing into LV
Cor pulmonale
Cardiovascular
Acute respiratory distress syndrome
ACS
High altitude pulmonary edema
Acute Valve Dysfunction
Constrictive pericarditis
Aortic Dissection