ventriculoatrial

adjective

ven·​tric·​u·​lo·​atri·​al ven-ˌtrik-yə-lō-ˈā-trē-əl 

1

: of, relating to, or being an artificial shunt between a ventricle of the brain and an atrium of the heart especially to drain cerebrospinal fluid (as in hydrocephalus)

2

: of, relating to, or being conduction from the ventricle to the atrium of the heart