The papers presented in this supplement volume of "Acta " "Neurochirugica" cover a broad spectrum from basic data on the pathophysiology of Subarachnoid Haemorrhage (SAH) and delayed ischaemic dysfunction to the clinical use of Nimodipine which has been largely documented among calcium inhibitors for its cerebro-vascular properties. The first two presentations deal with the pathophysiological events following SAH and discuss a variety of mechanisms which may be responsible for the neurological dysfunction. The second part discusses the cerebro-vascular and direct cerebral effects of...