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Meta-Analysis
. 2020 Sep 12;9(9):CD001081.
doi: 10.1002/14651858.CD001081.pub4.

Carotid endarterectomy for symptomatic carotid stenosis

Amaraporn Rerkasem  1 , Saritphat Orrapin  2 , Dominic Pj Howard  3 , Kittipan Rerkasem  1   4
Affiliations
Meta-Analysis

Carotid endarterectomy for symptomatic carotid stenosis

Amaraporn Rerkasem et al. Cochrane Database Syst Rev. .

Abstract

Background: Stroke is the third leading cause of death and the most common cause of long-term disability. Severe narrowing (stenosis) of the carotid artery is an important cause of stroke. Surgical treatment (carotid endarterectomy) may reduce the risk of stroke, but carries a risk of operative complications. This is an update of a Cochrane Review, originally published in 1999, and most recently updated in 2017.

Objectives: To determine the balance of benefit versus risk of endarterectomy plus best medical management compared with best medical management alone, in people with a recent symptomatic carotid stenosis (i.e. transient ischaemic attack (TIA) or non-disabling stroke).

Search methods: We searched the Cochrane Stroke Group Trials Register, CENTRAL, MEDLINE Ovid, Embase Ovid, Web of Science Core Collection, ClinicalTrials.gov, and the WHO International Clinical Trials Registry Platform (ICTRP) portal to October 2019. We also reviewed the reference lists of all relevant studies and abstract books from research proceedings.

Selection criteria: We included randomised controlled trials (RCTs) comparing carotid artery surgery plus best medical treatment with best medical treatment alone. DATA COLLECTION AND ANALYSIS: Two review authors independently selected studies, assessed risk of bias, and extracted the data. We assessed the results and the quality of the evidence of the primary and secondary outcomes by the GRADE method, which classifies the quality of evidence as high, moderate, low, or very low.

Main results: We included three trials involving 6343 participants. The trials differed in the methods of measuring carotid stenosis and in the definition of stroke. Using the primary electronic data files, we pooled and analysed individual patient data on 6092 participants (35,000 patient-years of follow-up), after reassessing the carotid angiograms and outcomes from all three trials, and redefining outcome events where necessary, to achieve comparability. Surgery increased the five-year risk of any stroke or operative death in participants with less than 30% stenosis (risk ratio (RR) 1.25, 95% confidence interval (CI) 0.99 to 1.56; 2 studies, 1746 participants; high-quality evidence). Surgery decreased the five-year risk of any stroke or operative death in participants with 30% to 49% stenosis (RR 0.97, 95% CI 0.79 to 1.19; 2 studies, 1429 participants; high-quality evidence), was of benefit in participants with 50% to 69% stenosis (RR 0.77, 95% CI 0.63 to 0.94; 3 studies, 1549 participants; moderate-quality evidence), and was highly beneficial in participants with 70% to 99% stenosis without near-occlusion (RR 0.53, 95% CI 0.42 to 0.67; 3 studies, 1095 participants; moderate-quality evidence). However, surgery decreased the five-year risk of any stroke or operative death in participants with near-occlusions (RR 0.95, 95% CI 0.59 to 1.53; 2 studies, 271 participants; moderate-quality evidence).

Authors' conclusions: Carotid endarterectomy reduced the risk of recurrent stroke for people with significant stenosis. Endarterectomy might be of some benefit for participants with 50% to 69% symptomatic stenosis (moderate-quality evidence) and highly beneficial for those with 70% to 99% stenosis (moderate-quality evidence).

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Conflict of interest statement

Amaraporn Rerkasem: none known Saritphat Orrapin: none known Dominic PJ Howard: none known Kittipan Rerkasem: none known

Figures

1
1
Study flow diagram
2
2
'Risk of bias' graph: review authors' judgements about each 'Risk of bias' item presented as percentages across all included studies
3
3
'Risk of bias' summary: review authors' judgements about each 'Risk of bias' item for each included study
1.1
1.1. Analysis
Comparison 1: Surgery versus no surgery, Outcome 1: Any stroke or operative death
1.2
1.2. Analysis
Comparison 1: Surgery versus no surgery, Outcome 2: Ipsilateral ischaemic stroke and any operative stroke or death
1.3
1.3. Analysis
Comparison 1: Surgery versus no surgery, Outcome 3: Disabling or fatal ipsilateral ischaemic or operative stroke and death
2.1
2.1. Analysis
Comparison 2: Subgroup analyses (5‐year cumulative risk of ipsilateral carotid ischaemic stroke, and any stroke or death within 30 days after surgery, according to 3 variables in patients with > 50% carotid stenosis in ECST and NASCET), Outcome 1: Sex
2.2
2.2. Analysis
Comparison 2: Subgroup analyses (5‐year cumulative risk of ipsilateral carotid ischaemic stroke, and any stroke or death within 30 days after surgery, according to 3 variables in patients with > 50% carotid stenosis in ECST and NASCET), Outcome 2: Age (years)
2.3
2.3. Analysis
Comparison 2: Subgroup analyses (5‐year cumulative risk of ipsilateral carotid ischaemic stroke, and any stroke or death within 30 days after surgery, according to 3 variables in patients with > 50% carotid stenosis in ECST and NASCET), Outcome 3: Time since last event (weeks)
See this image and copyright information in PMC

Update of

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References to other published versions of this review

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