“…The crucial problem with anticoagulants is that any substance capable of preventing thrombus formation may, incorrectly administered, lead to severe haemorrhagic complica tions (Leman, 1968). It doesn't come as a surprise, therefore, that bleeding of virtually any kind has been reported by Bel (1968), Fearn (1968), Hachen (1968), Oldeqkott (1966) and Smith (1969). In a previous paper read at the annual meeting two years ago-a report which dealt with spontaneous hypoprothrom binaemic states in acutely injured paraplegics-I already analysed some of the pitfalls and hazards of oral anticoagulants.…”