Which of the following conditions is most likely to occur in a patient with the following hemodynamic data? Pressures: RA = 12 mm Hg, RV = 50/12 mm Hg, PA=50/15 mm Hg,PA wedge pressure = 8 mm Hg, Aoa=80/60,Cardiac Index = 1.4, SVR= 1800, PVR=500.