Statin pretreatment is associated with better outcomes in large artery atherosclerotic stroke

A multicenter study of the safety and effectiveness of mechanical thrombectomy for patients with acute ischemic stroke not meeting top-tier evidence criteria

BACKGROUND

While mechanical thrombectomy (MT) has become the standard of care for patients with acute ischemic stroke (AIS) with emergent large-vessel occlusions (ELVO), recently published guidelines appropriately award top-tier evidence to the same selective criteria that were employed in completed clinical trials. We sought to evaluate the safety and effectiveness of MT in patients with AIS with ELVO who do not meet top-tier evidence criteria (TTEC).

METHODS

We conducted an observational study on consecutive patients with AIS with ELVO who underwent MT at six high-volume endovascular centers. Standard safety outcomes (3-month mortality, symptomatic intracranial hemorrhage) and effectiveness outcomes (3-month functional independence: modified Rankin Scale scores of 0-2) were compared between patients meeting and failing TTEC.

RESULTS

The sample consisted of 349 (60%) controls fulfilling TTEC and 234 (40%) non-TTEC patients. Control patients meeting TTEC for MT tended to have higher functional independence rates at 3 months (47% vs 39%; p=0.055), while the rates of symptomatic intracerebral hemorrhage (sICH) were similar (9%) in both groups (p=0.983). In multivariable logistic regression models, adherence to TTEC for MT was not independently related to any safety outcome (sICH: OR 0.71, 95% CI 0.30 to 1.68, p=0.434; 3-month mortality: OR 1.27, 95% CI 0.69 to 2.33, p=0.448) or effectiveness outcome (3-month functional independence: OR 0.81, 95% CI 0.48 to 1.37, p=0.434; 3-month functional improvement: OR 0.73, 95% CI 0.48 to 1.11, p=0.138) after adjusting for potential confounders.

CONCLUSIONS

Approximately 40% of patients with AIS with ELVO offered MT do not fulfill TTEC for MT. Patients who did not meet TTEC had high rates of good clinical outcome and low complication rates.

Endovascular thrombectomy with or without systemic thrombolysis?

OBJECTIVES

Current recommendations advocate that pretreatment with intravenous thrombolysis (IVT) should first be offered to all eligible patients with emergent large vessel occlusion (ELVO) before an endovascular thrombectomy (ET) procedure. However, there are observational data that question the safety and efficacy of IVT pretreatment in patients with ELVO.

METHODS

We performed a meta-analysis of the included subgroups from ET randomized controlled trials (RCTs) to evaluate the comparative efficacy between direct ET without IVT pretreatment and bridging therapy (IVT and ET) in patients with ELVO.

RESULTS

We included a total of seven RCTs, including 1764 patients with ELVO (52.8% men). Patients receiving bridging therapy (IVT followed by ET) had lower rates (p = 0.041) of 90-day death/severe dependency (modified Rankin Scale-score of 5-6; 19.0%, 95% CI: 14.1-25.1%) compared with patients receiving only ET (31.0%, 95% CI: 21.2-42.9%). Moreover, patients receiving IVT and ET had a nonsignificant (p = 0.389) trend towards higher 90-day functional independence rates (51.4%, 95% CI: 42.5-60.1%) compared with patients undergoing only ET (41.7%, 95% CI: 24.1-61.7%). Finally, shift-analysis uncovered a nonsignificant trend towards functional improvement at 90 days for bridging therapy over ET (cOR = 1.28, 95% CI: 0.91-1.89; p = 0.155). It should be noted that patients included in the present meta-analysis were not randomized to receive IVT, and thus the two groups (bridging therapy versus ET monotherapy) may differ in terms of baseline characteristics and, in particular, in terms of onset to groin puncture time and thus the risk of confounding bias cannot be ruled out.

CONCLUSION

Despite the limitations and the risk of confounding bias, our findings contradict the recent notion regarding potential equality between ET and bridging therapy in ELVO patients and suggest that IVT and ET are complementary therapies that should be pursued in a parallel and noncompeting fashion.

Impact of awake blood pressure variability on cerebrovascular atherosclerosis in Chinese patients with acute ischemic stroke

BACKGROUND

Blood pressure (BP) variability has been shown to be an independent risk factor of stroke and target organ damage because of hypertension, but so far, there have been very few studies investigating the impact of BP variability on cerebrovascular atherosclerosis.

METHODS

A total of 409 participants were enrolled and classified according to patterns of cerebrovascular atherosclerosis (i.e. large or small artery atherosclerosis; extracranial; or intracranial artery atherosclerosis). Coefficient of variation (CV) was used as a marker of BP variability. Multivariate binary logistical regression was used to analyze the associations between BP variability and the risk of different patterns of cerebrovascular atherosclerosis.

RESULTS

The risk of large artery atherosclerosis and extracranial arterial stenosis, respectively, had a dose-responsive positive relationship with the tertiles of awake systolic blood pressure (SBP) CVs [large artery atherosclerosis, the second tertile, adjusted odds ratio (OR)=2.839, 95% confidence interval (CI) 1.593-5.059, P<0.001; the third tertile, adjusted OR=4.010, 95% CI 1.859-8.651, P<0.001; extracranial arterial stenosis, the second tertile, adjusted OR=2.274, 95% CI 1.189-4.348, P=0.013; the third tertile, adjusted OR=2.568, 95% CI 1.230-5.360, P=0.012, when referenced to the first tertile], but not with those of mean awake SBP. The third tertile of awake SBP CVs indicated a significantly higher risk of intracranial arterial stenosis (adjusted OR=2.253, 95% CI 1.118-4.538, P=0.023) and advanced intracranial arterial stenosis (adjusted OR=5.073, 95% CI 2.064-12.466, P<0.001) when referenced to the first tertile.

CONCLUSION

In Chinese patients with acute atherosclerotic stroke, higher awake BP variability (measured in the subacute stage) might be associated with a higher risk of large artery atherosclerosis.