Effect of the Presence of Cardiac Tamponade on Jugular Vein Diameter in Cases of Cardiac Arrest Due to Thoracic Aortic Disease.

Background There have so far been no reports regarding whether or not the jugular veins remain distended even in cases of cardiac arrest, which is the worst form of shock. We focused on the diameter of the jugular vein in neck computed tomography (CT) in cases of thoracic aortic disease resulting in cardiac arrest to determine whether or not cardiac tamponade increased the diameter. Methodology From January 2014 to December 2021, patients were eligible for inclusion when they were transported to our hospital, judged to be in cardiac arrest at the emergency department, and then diagnosed with thoracic aortic disease as the cause of cardiac arrest according to CT. Patients were divided into two groups according to the presence (tamponade (+)) or absence (tamponade (-)) of cardiac tamponade. Comparisons between the two groups were also conducted after excluding cases in which relief of cardiac tamponade was obtained before CT or that had hemothorax. Results There were 52 cases in the cardiac tamponade (+) group and 16 in the cardiac tamponade (-) group. The diameters of both the right and left internal jugular veins were significantly larger in the cardiac tamponade (+) group than in the cardiac tamponade (-) group. After excluding cases with relief of cardiac tamponade before CT and hemothorax complications, the right and left internal and external jugular vein diameters in the cardiac tamponade (+) group were still significantly greater than those in the cardiac tamponade (-) group. Conclusions The present study showed that the cardiac tamponade induced by thoracic aortic cases tended to display larger internal jugular vein diameters compared to cases without cardiac tamponade, even in patients experiencing cardiac arrest. Additionally, cardiac tamponade consistently presented with larger diameters in the right-sided jugular vein.