Sudden death, right sided hea failure (cor pulmonale or cardiovascular collapse occur when ?: (A) Small pulmonary embolism, (B) Massive pulmonary embolism, (C) 60% or more of pulmonary aery is obstructed with emboli, (D) End aery obliteration
Answer is C. Ans. is 'c' i.e., 60% or more of pulmonary aery is obstructed with emboli