Accuracy of TCD Monitoring in Predicting Cerebral Hyperperfusion Syndrome After Carotid Endarterectomy
Recruitment status was: Not yet recruiting
Background: Cerebral hyperperfusion syndrome (CHS) is a life threatening complication of carotid endarterectomy (CEA) and the changes of middle cerebral artery velocity are used to predict the occurrence of CHS but the accuracy is limited. In addition, changes of BP post-operatively comparing with baseline BP should be a predictive factor of CHS.
Objective: The investigators aimed to create a predictive index, velocity systolic blood pressure index (VSI), for improving the predictive power of Transcranial Doppler monitoring regarding CHS.
Methods: The study design is a diagnostic test, which is an observational analytic clinical study. From March 2013 to September 2014, 200 patients will be recruited. Patients will be classified according to the CHS occurrence. VSI combined the changes of middle cerebral artery velocity and blood pressure crossing CEA and the intra- and post-operative increase ratios of middle cerebral artery velocity were calculated. Their prediction power of CHS will be compared. Sensitivity, specificity, positive predictive value, negative predictive value of them will be calculated. Receiver operating characteristic analysis will be performed.
Expected Outcomes: Comparing with the commonly used intra-operative and post-operative TCD monitoring, VSI may be more useful to select CHS in patients who underwent CEA. As far as the investigators know, analysis or studies combining the BP and velocity changes in the prediction of CHS have never been performed.
|Carotid Stenosis Cerebral Hyperperfusion Syndrome Blood Pressure|
|Study Design:||Observational Model: Cohort
Time Perspective: Prospective
|Official Title:||Velocity Systolic Blood Pressure Index in Accurately Predicting Cerebral Hyperperfusion Syndrome After Carotid Endarterectomy|
- cerebral hyperperfusion syndrome [ Time Frame: within 7 days after surgery ]CHS will be diagnosed if (1) the patient developed symptoms that ipsilateral moderate or severe headache, confusion, seizures, intracranial hemorrhage or focal neurological deficits after a symptom-free interval. (2) symptoms not secondary to cerebral ischemia which will be excluded by CT or MRI. (3) MCAV increasing >100% from baseline which identified by TCD. (4) within 7 days after surgery. (5) An independent neurologist made the diagnosis of CHS.
|Study Start Date:||March 2013|
|Estimated Study Completion Date:||December 2014|
|Estimated Primary Completion Date:||September 2014 (Final data collection date for primary outcome measure)|
Please refer to this study by its ClinicalTrials.gov identifier: NCT01799070
|Contact: Bao Liu, MDfirstname.lastname@example.org|
|vascular surgery department of PUMCH||Not yet recruiting|
|Beijing, Beijing, China, 100730|
|Principal Investigator: Bao Liu, MD|
|Principal Investigator: Changwei Liu, MD|
|Sub-Investigator: Zhichao Lai, MD|