Suicide would be your answer.
In the pulmonary loop, deoxygenated blood exits the right ventricle of the heart and passes through the pulmonary trunk. The pulmonary trunk splits into the right and left pulmonary arteries. These arteries transport the deoxygenated blood to arterioles and capillary beds in the lungs.
Aggression
Memory loss
Agitation
Depression
I named a few just in case. Hope this helped :)