THROMBOEMBOLISM IS A common problem in neurosurgery and neurology pati
ents. Within this diverse population are subpopulations of patients wi
th varying degrees of thromboembolic risk: low, moderate, and high. Pa
tients at substantial risk for deep vein thrombosis and pulmonary embo
lism include those with spinal cord injury, brain tumor, subarachnoid
hemorrhage, head trauma, stroke, and patients undergoing a neurosurgic
al operation. There are prophylactic strategies that can be applied to
these various risk groups that will dramatically reduce the incidence
of thromboembolism. The risk of pulmonary embolism or fatal pulmonary
embolism typically exceeds the risk of severe or fatal bleeding from
adequate prophylaxis, and these techniques should be applied on a rout
ine basis. To adequately care for patients with deep venous thrombosis
and pulmonary embolism, the physician requires a thorough understandi
ng of the methods of diagnosis, the pharmacokinetics of heparin and wa
rfarin, and a knowledge of their role in the treatment strategies that
have proven efficacy and safety. In addition, an awareness of the low
molecular weight heparins and heparinoids is becoming essential. Thes
e new agents have a potentially promising role in both the prophylaxis
and treatment of patients with neurological disease. The principles c
oncerning the prophylaxis, diagnosis, and clinical management of venou
s thromboembolic disease in neurosurgery and neurology patients are de
alt with in this review.