[Intracranial atherosclerosis]

Intracranial arterial stenoses: current viewpoints, novel approaches, and surgical perspectives

Ten percent of all strokes occurring in the USA are caused by intracranial arterial stenosis (IAS). Symptomatic IAS carries one of the highest rates of recurrent stroke despite intensive medical therapy (25 % in high-risk groups). Clinical results for endovascular angioplasty and stenting have been disappointing. The objectives of this study were to review the contemporary understanding of symptomatic IAS and present potential alternative treatments to resolve factors not addressed by current therapies. We performed a literature review on IAS pathophysiology, natural history, and current treatment. We present an evaluation of the currently deficient aspects in its treatment and explore the role of alternative surgical approaches. There is a well-documented interrelation between hemodynamic and embolic factors in cerebral ischemia caused by IAS. Despite the effectiveness of medical therapy, hemodynamic factors are not addressed satisfactorily by medications alone. Collateral circulation and severity of stenosis are the strongest predictors of risk for stroke and death. Indirect revascularization techniques, such as encephaloduroarteriosynangiosis, offer an alternative treatment to enhance collateral circulation while minimizing risk of hemorrhage associated with hyperemia and endovascular manipulation, with promising results in preliminary studies on chronic cerebrovascular occlusive disease. Despite improvements in medical management for IAS, relevant aspects of its pathophysiology are not resolved by medical treatment alone, such as poor collateral circulation. Surgical indirect revascularization can improve collateral circulation and play a role in the treatment of this condition. Further formal evaluation of indirect revascularization for IAS is a logical and worthy step in the development of intracranial atherosclerosis treatment strategies.

[Control of cardiovascular risk factors in patients with stroke attended in primary care in Spain. ICTUSCARE study]

BACKGROUND

The aim of this cross-sectional, multicenter survey was: 1) To investigate the level of control of cardiovascuar risk factors in patients with a previous stroke. 2) To know the pharmacological therapy used to attain the control.

PATIENTS AND METHODS

Data obtained from a total of 955 patients were included in the analysis.. There were evaluated cardiovascular risk factors, parameters related to the degree of control, analytical parameters, antropometric and pharmacological indicated treatment.

RESULTS

The majority (61%) had suffered an ischemic stroke and 97.7% presented at least one associated cardiovascular risk factor, being hypertension (84.8%) and dyslipidemia (61.8%) the most frequent. Other factors were abdominal obesity (42.9%), diabetes mellitus (35.6%) and smoking (25.1%). Only 1.2% of the patients presented an adequate control of all cardiovascular risk factors. Only 17.6% had a well controlled blood pressure and in 29.8% LDL-cholesterol was well controlled. In 50.2% of diabetic patients HbA1c was well controlled. Angiotensin receptor blockers were the most widely used antihypertensive drugs (57.6%) while thiazide diuretics were prescribed in 33.4%. Statins were prescribed in 72.8% of patients and metformin, aspirin and acenocumarol in 30.2%, 57.3%, and 15.0% respectively.

CONCLUSIONS

In conclusion, in patients with a past history of stroke arterial hypertension is the most common cardiovascular risk factor and the control of these factors requires an improvement.