passages.id: split_8_test_1022_passage
passages.type: progene_text
passages.text: To compare quantitative LV opacification with OCTA ( 0.2 , 0. 5 , 3.0 , 5.0 mL ) versus AIR ( 0.08 mL / kg , 0.22 mL / kg ) , we performed videodensitometry in 199 patients ( average age 59.2 +/- 13.3 years , 79 % men ) studied in 2 identical , prospective , multicenter , blinded trials , of whom 74 had impaired LV function , pulmonary disease , or both , 70 were obese ( body mass index > 30 kg / m(2) ) , and 45 were nonechogenic ( > / = 4 of 6 endocardial segments were not seen in the apical 4-chamber view ) .