In patients with cardiogenic sudden death, we can see that their lips turn purple, commonly referred to as cyanosis of the lips. Similarly, their faces also turn purple. This primarily results from cardiac arrest caused by cardiogenic sudden death. Once the heart stops beating, the blood supply to the entire body, including the heart, brain, kidneys, peripheral vessels, face, skin, and fingers, is halted. This leads to a state of hypoxia. The purple discoloration (cyanosis) occurs because, after the heart stops, there is no blood flow and no oxygen exchange in the blood, ultimately leading to hypoxia.