Pulmonary embolism: The diagnosis of PE should be considered in any patient who experiences acute dyspnea, chest pain, unexplained tachycardia, hypoxemia, syncope, or shock. The most common symptoms include dyspnea, pleuritic or nonpleuritic chest pain, anxiety, cough, and syncope, though PE can present as confusion or even seizure. Common signs include hypoxemia, tachypnea, tachycardia, hemoptysis, diaphoresis, and low-grade fever. Clinical signs of DVT occur in about 50% of patients with PE. Massive PE can cause hypotension, severe hypoxemia, or cardiopulmonary arrest. However, the clinical presentation of VTE can be insidious; there is poor correlation between the size of a PE and the severity of symptoms. In fact, patients with sizable PE may be asymptomatic.