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[Thrombosis of the superior vena cava as a complication of permanent cardiac pacing].

The authors present an account of thrombosis of the superior vena cava which developed in two patients with permanent cardiac pacing and led to the development of superior vena cava syndrome. The cause was loosening of the impaired stimulating electrode from fixation and its penetration into the superior vena cava with subsequent formation of a thrombus on the bare surface of the spiral. Contemporary therapeutic procedures are reviewed.