<prompt> Answer this question truthfullyWhat is the diagnostic significance of echocardiography and ultrasound in determining myelofibrosis?  <response>: <reason> There are no echocardiography ultrasound findings associated with myelofibrosis. However, an echocardiography ultrasound may be helpful in the diagnosis of complications of myelofibrosis, which include heart failure, splenic rupture, pulmonary hypertension, intestinal obstruction, splenomegaly, hepatomegaly, ureteral obstruction, and thrombotic events. 