SKIP Study

Clinical Trial Details

Randomized study of endovascular therapy with versus without intravenous tissue plasminogen activator in acute stroke with ICA and M1 occlusion - A prospective, multicenter, randomized trial

The goal of this study is to make clear the efficacy of endovascular alone therapy for ischemic stroke.

Trial summarized by: Irene L Llorente, PhD
Content reviewed by: Ralph Sacco, MD, MS

Key Findings

In a Japanese stroke population this trial did not show the noninferiority of direct EVT to bridging therapy with respect to favorable outcomes. However, intracerebral hemorrhages of direct EVT was significantly fewer than bridging therapy.

At-a-glance

Purpose: To determine if endovascular therapy (EVT) is as effective as bridging therapy with EVT and intravenous thrombolysis (IVT) in acute ischemic stroke.?

Trial Design: prospective, multicenter, open-treatment trial. N= 204, mean age 74 years. Patients with ICA and M1 acute ischemic stroke were randomized within 4.5 hours of stroke symptom onset to either EVT alone or to IVT and EVT.

Primary Endpoints: Noninferiority: mRS of 0-2 90 days after onset of stroke.

SKIP study Primary Results
@90 Days EVT IVT + EVT OR P value
mRS 0-2 59.4% 57.3% OR 1.09 P=0.18
for noninferiority
Intracranial hemorrhage within 36 hours 33.7% 50.5% )R 0.50 P=0.02
Mortality @ 90 days 7.9% 8.7% P=1.00

Results: Noninferiority of direct EVT to bridging therapy was not demonstrated.

Impression:

This trial may help determine whether direct EVT should be recommended as a routine clinical strategy for ischemic stroke patients within 4.5 h from onset. Direct EVT would then become the choice of therapy in stroke centers with endovascular facilities.


SKIP study results

Ralph Sacco, MD, past president of the American Heart Association interviews Kentaro Suzuki, MD about the results of the SKIP study, and what they reveal about EVT and IVT in treating AIS.

Results

Rate of favorable outcome at 90 days between two groups was not significantly different. However, intracerebral hemorrhages of direct EVT was significantly fewer than bridging therapy. In a Japanese stroke population this trial did not show the noninferiority of direct EVT to bridging therapy with respect to favorable outcomes.

Primary endpoints:

  • Rate of Modified Rankin Scale (mRS) 0-2 at 90 days after onset: Unadjusted logistic regression model (ITT): odds ratio 1.09, 95% CI 0.63 - 1.90, p=0.17 for noninferiority.

Secondary endpoints:

  • Shift analysis(ITT): odds ratio 0.97, 95% CI 0.60 - 1.56, p=0.27 for noninferiority.
  • Unadjusted logistic regression model (PPT): odds ratio 1.06, 95% CI 0.60 - 1.88, p=0.22 for noninferiority
  • Mortality at 90 days did not differ between the two groups (8 [7.9%] and 9 [8.7%], respectively; odds ratio 0.90, 95% CI 0.33-2.43, P=1.00
  • Reperfusion rate at MT (TICI grade≥2B): odds ratio 0.89, 95% CI 0.51-1.55, p=0.78

Safety endpoints:

  • The rate of any intracranial hemorrhage within 36 hours from onset were 34 (33.7%) in the direct EVT group and 52 (50.5%) in the bridging therapy group (odds ratio, 0.50; 95% CI, 0.28 to 0.88; P=0.02).
    • Symptomatic ICH (NINDS criteria) at 36h: odds ratio, 0.65; 95% CI, 0.25 to 1.67; P=0.48
    • Symptomatic ICH (SIT-MOST criteria) at 36h: odds ratio, 0.75; 95% CI, 0.25 to 2.24; P=0.78

Recommended and supporting content:

Background

Trial design:

  • Basic design: Parallel
  • Randomization: Randomized
  • Randomization unit: Cluster
  • Blinding: Open (no one is blinded)
  • Control: Active

Trial population:

  • Inclusion criteria:
    • Patients of from 18 to 85 years old
    • Continued clinical symptoms in patients with acute cerebral infarction
    • Pre mRS within 2
    • Patients with ICA or M1 occlusion and be able to puncture within 4 hours.
    • DWI-ASPECTS more than 5 or ASPECTS more than 6 at pre endovascular therapy
    • NIHSS more than 6
    • Puncture within 4 h from onset.
    • Research consent have been obtained in writing from the person or alternative person
       
  • Exclusion criteria:
    • Contraindication of contrast agent or endovascular therapy
    • Contraindication of IVT
    • Presence of severe renal disorder (patients undergoing introduction of dialysis can be included)
    • Pregnancy or possibility of pregnancy
    • Unlikely to complete the study, such as due to progressive malignant tumor
    • Judged as incompatible for the study by the investigators

Interventions:

Patients randomized to the direct EVT group receive EVT without IVT. EVT can be performed using several devices (e.g. Merci, Penumbra, Trevo, Solitaire, Revive, any stents and percutaneous angioplasty balloon). Patients randomized to the bridging therapy group receive IVT preceding EVT. Intravenous recombinant tissue plasminogen activator (rt-PA) is administered at 0.6 mg/kg body weight up to a maximum of 60 mg, 10% as bolus, and 90% as continuous infusion over 1 h according to the Japanese guidelines. EVT has to be initiated as soon as possible, within 90 min from hospital admission. 

Primary endpoints:

  • Rate of Modified Rankin Scale (mRS) 0-2 at 90 days after onset. 

Secondary endpoints:

  • mRS score (Shift analysis)
  • mRS score 0-2 (Per protocol analysis)
  • Death at 90 days
  • Reperfusion rate at MT (TICI grade≥2B) 

Safety endpoints:

  • Rate of asymptomatic and symptomatic intracranial hemorrhage at 36 hours after onset.

Sponsors and Collaborators:

  • Nippon Medical School

Related Science:

References:

Key Words:
Stroke, Ischemia, Cerebral Infarction, Cerebrovascular Disorders, Endovascular therapy, intravenous thrombolysis
 

Related Clinical Topics:
Fibrinolytic agents, Fibrin Modulating agents, Plasminogen, Tissue Plasminogen Activator
 

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