Double valve endocarditis
(apical 4 chambers) displays both affected valves
focuses on the tricuspid only
focuses on the mitral (above) and aortic (below) valves, with the latter being unaffected.
Infective endocarditis is diagnosed with Duke criteria, requiring 2 major criteria, 1 major and 3 minor or 5 minor criteria to confirm the diagnosis. Ultrasound evidence or cardiac murmur is one of the 2 major criteria and the other one is positive blood cultures.
From echocardiographer.org