cerebral oxygen saturation are weighted venous samples (70% venous, 30% arterial) Pulse oximeter values are based on arterial oxygen saturations.

James Mackenzie has written:

'The study of the pulse, arterial, venous, and hepatic, and of the movements of the heart' -- subject(s): Accessible book, Pulse

'Diseases of the heart' -- subject(s): Heart, Diseases

Conductance vessels distribute blood to and from the tissues. Arterial vessels also damp the pulse prssure, and veins contribute to venous capacitance.

Venous ulcer are caused by venous insufficiency (improper functioning of venous valves).

No. Venous is simply a modifier to the brand name Doppler.