Diabetes and Risk of Ischemic Stroke.

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

3739 participants

Study Classification

OBSERVATIONAL

Study Start Date

1990-01-01

Study Completion Date

2019-06-30

Brief Summary

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Diabetes in an independent risk factor for ischemic stroke, whose associated mortality rate is higher and sequelae more serious than for nondiabetics. Diabetes increases the risk of stroke or death after surgical carotid revascularization or endoluminal angioplasty. It is, with contralateral ICA occlusion, 1 of the 7 factors doubling the stroke risk after carotid endarterectomy. Diabetes also enhances the cerebral hemorrhage risk associated with carotid surgery, thrombectomy or thrombolysis revascularization of the cerebral arteries.

This study was undertaken to examine whether the hemodynamic cerebral ischemia (HCI) frequency, which increases stroke severity, is higher in diabetics than nondiabetics and, if diabetes carries an excess HCI risk, whether it is independent of contralateral ICA occlusion.

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Detailed Description

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Embolic and hemodynamic mechanisms are the main causes underlying ischemic strokes of carotid origin. The hemodynamic cerebral ischemia (HCI) risk depends on the contribution of the contralateral internal carotid artery (ICA) and vertebral arteries via the circle of Willis, the ipsilateral external carotid artery via the ophthalmic artery and the leptomeningeal arteries. During carotid surgery, impaired collateral flow is associated with the need for shunt insertion.

When HCI is present, cerebral perfusion is initially maintained by vasodilation of precapillary arterioles and the increased extraction coefficient of oxygen. Secondarily, vascular reserve exhaustion by degradation of arterial lesions engenders a loss of cerebral autoregulation, ischemic penumbra and cerebral infarction.

Carotid revascularization with an incomplete circle of Willis enhances the postoperative ischemic stroke risk. The loss of cerebral autoregulation, attributable to HCI combined with ipsilateral carotid tight stenosis, heightens the risk of hyperperfusion and cerebral hemorrhage.

Carotid occlusion is the primary cause of HCI. Carotid occlusions and tight stenoses lead to loss of cerebral autoregulation and cerebrovascular reserve, and have been associated with a 4-fold-increased stroke risk.

Diabetes in an independent risk factor for ischemic stroke, whose associated mortality rate is higher and sequelae more serious than for nondiabetics. Diabetes increases the risk of stroke or death after surgical carotid revascularization or endoluminal angioplasty.It is, with contralateral ICA occlusion, 1 of the 7 factors doubling the stroke risk after carotid endarterectomy. Diabetes also enhances the cerebral hemorrhage risk associated with carotid surgery, thrombectomy or thrombolysis revascularization of the cerebral arteries.

This study was undertaken to examine whether the HCI frequency is higher in diabetics than nondiabetics and, if diabetes carries an excess HCI risk, whether it is independent of contralateral ICA occlusion.

Conditions

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Carotid Stenosis

Study Design

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Observational Model Type

COHORT

Study Time Perspective

PROSPECTIVE

Study Groups

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Diabetics

Diabetics patients who underwent internal carotid artery surgery

carotid clamping

Intervention Type PROCEDURE

Occurrence of consciousness perturbations, language difficulties and/or contralateral motor deficit during the carotid-clamping test and requiring shunt placement.

Nondiabetics

Nondiabetics patients who underwent internal carotid artery surgery

carotid clamping

Intervention Type PROCEDURE

Occurrence of consciousness perturbations, language difficulties and/or contralateral motor deficit during the carotid-clamping test and requiring shunt placement.

Interventions

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carotid clamping

Occurrence of consciousness perturbations, language difficulties and/or contralateral motor deficit during the carotid-clamping test and requiring shunt placement.

Intervention Type PROCEDURE