Abstract
Injection of physiologic saline solution or Urokon (sodium 3-acetylamino-2,4,6-triiodo-benzoate) 70% into the right atrium did not change the atrial pressure to any extent. The pressure effects in the right atrium on injection of physiologic saline or Urokon 70% into the inferior vena cava at the level of the renal or hepatic veins gave roughly the same pressure effects as direct injection into the right atrium.

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