Gas Embolism

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Abstract
The use of gas injection for contrast in clinical diagnostic roentgenology is increasing. The danger of venous or arterial gas embolism is always inherent in such diagnostic procedures as well as in therapeutic procedures in which entry of air into the circulation may occur. Deliberate introduction of air or oxygen by the presacral route into the mediastinum is now being widely advocated for diagnostic purposes. Pneumoperitoneum and pneumothorax have long been employed in diagnostic roentgenology; insufflation of the urinary bladder and many of the larger joints has also been performed. Angiocardiography involves a potential hazard because of possible accidental venous air embolism. The accidental occurrence of air embolism is well known in other clinical situations, particularly in surgical procedures involving the veins of the neck or the dural sinuses, performed with the patient in a sitting position, in uterine curettage, and during delivery of patients with placenta previa. Serious sequelae following...

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