The document discusses different types of embolism, focusing on pulmonary embolism. Pulmonary embolism is defined as an embolism in the pulmonary arterial tree, where emboli most commonly originate from deep vein thromboses in the legs. Risk factors for pulmonary embolism include advanced age, obesity, prolonged surgery, and cancer. Consequences of pulmonary embolism depend on the size of the emboli and include pulmonary infarction, hemorrhage, and hypertension. Cardiac tamponade is also discussed, which is a medical emergency caused by fluid accumulation in the pericardial sac compressing the heart.