Final answer:
The main venous factors that pose a risk of stroke include atherosclerosis, illicit drug use, and heart failure increasing the risk of DVT.
Step-by-step explanation:
The main risk factors for stroke are age, high blood pressure, having a previous stroke, diabetes, high cholesterol, and smoking. These factors can lead to atherosclerosis in the arteries of the brain, which can result in a stroke. Another venous factor that poses a risk of stroke is the use of illicit drugs such as amphetamines or cocaine.
Having had a stroke in the past greatly increases the risk of future strokes, and men are more likely than women to have strokes.
In addition, individuals with heart failure have a higher risk of deep vein thrombosis (DVT), which occurs when a blood clot forms in the deep veins, usually in the legs. Long plane flights, where sitting for long periods of time can cause blood to pool in the legs, increase the risk of DVT.