<prompt> Answer this question truthfullyWhat are the natural history, complications, and prognosis of pulmonary embolism?  <response>: <reason> Atrial flutter Heart failure or shock Pulmonary hypertension Pulseless electrical activity Sudden cardiac deathChronic thromboembolic hypertension rare - 1 Pulmonary hypertension Recurrent pulmonary embolismSevere bleeding can occur as a complication of fibrinolytic treatment:Major hemorrhage - 10 Non major hemorrhage - 20 Intracranial hemorrhage - 0.5 