RT Journal
A1 Styczynski G, Jaltuszewska M, Kosiorowska N, Kostrzewska M, Szmigielski C
T1 DIlated inferior vena cava in young adults with vasovagal syncope
JF Archives of Internal Medicine
JO Archives of Internal Medicine
YR 2009
FD September 28
VO 169
IS 17
SP 1633
OP 1638
DO 10.1001/archinternmed.2009.271
UL http://dx.doi.org/10.1001/archinternmed.2009.271
AB 

			Vasovagal syncope is common in young adults, affecting up to 40% of subjects in this age group, with a female predominance.1 Its pathogenesis is not clear, but the main theory suggests a central role of the orthostatic venous pooling below the thorax, which leads to paradoxical activation of the cardio-neural inhibitory reflexes by the underfilled ventricles.2 We have occasionally seen dilated inferior vena cava (IVC) on echocardiograms of young patients with vasovagal syncope referred for cardiac evaluation. Since this observation could have pathophysiologic significance, we decided to design a study to measure the IVC diameter in a group of young adults with a history of vasovagal syncope.