Manpower and hours of work agreements are complementary.

Severe Raynaud's phenomenon can result in ulceration of the finger tips. Digital ulceration or gangrene may also be caused by non-vasospastic conditions. Emboli may be discharged from the fibrillating atrium, the ventricle after a myocardial infarction, or from an aneurysm of thhe subclavian artery. Arteriovenous malformations in the hand can cause enough shunting of blood to result in distal ischaemia. Occasionally, thrombotic disorders such as polycythaemia or thrombocythaemia may cause digital ischaemia, but this is most unusual in the hand.