Ventriculo-atrial shunts accounts for the second most common type of treatment for hydrocephalus patients who require an external CSF drainage. However, the effects of this treatment on cardiac hydrodynamics have not been researched enough. Thus, this work address the treatment trough the development of a computational model of a venous section to evaluate the effect of the catheter for ventriculo-atrial drainage on venous hydrodynamics. Thereby, having a better understanding of the effects, allowing in the future to offer better treatment guidance. Through this model, hydrodynamic disturbances were observed on the flow, pressures and mostly flow velocity. This disturbances were present mostly in the zone adjacent to the catheter insertion, on the internal jugular vein.