[The clinical diagnosis of lung embolism]

The clinical classification, pathophysiology and often difficult diagnosis of acute pulmonary embolism are reviewed. The diagnostic power of subjective and objective clinical symptoms and the diagnostic procedures (electrocardiogram, chest X-ray, echocardiography, pulmonary arteriography, pulmonary scintigraphy, determination of arterial blood gases) are evaluated and an actual investigative plan outlined. Diagnostic problems and frequent pitfalls are discussed. The often non characteristic and masked course in acute and chronically recurrent pulmonary embolism is emphasized.