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Clinical Trial
. 2019 Mar 9;393(10175):1021-1032.
doi: 10.1016/S0140-6736(19)30195-3. Epub 2019 Feb 7.

Efficacy and safety of minimally invasive surgery with thrombolysis in intracerebral haemorrhage evacuation (MISTIE III): a randomised, controlled, open-label, blinded endpoint phase 3 trial

Collaborators, Affiliations
Clinical Trial

Efficacy and safety of minimally invasive surgery with thrombolysis in intracerebral haemorrhage evacuation (MISTIE III): a randomised, controlled, open-label, blinded endpoint phase 3 trial

Daniel F Hanley et al. Lancet. .

Erratum in

  • Department of Error.
    [No authors listed] [No authors listed] Lancet. 2019 Apr 20;393(10181):1596. doi: 10.1016/S0140-6736(19)30859-1. Lancet. 2019. PMID: 31007203 No abstract available.

Abstract

Background: Acute stroke due to supratentorial intracerebral haemorrhage is associated with high morbidity and mortality. Open craniotomy haematoma evacuation has not been found to have any benefit in large randomised trials. We assessed whether minimally invasive catheter evacuation followed by thrombolysis (MISTIE), with the aim of decreasing clot size to 15 mL or less, would improve functional outcome in patients with intracerebral haemorrhage.

Methods: MISTIE III was an open-label, blinded endpoint, phase 3 trial done at 78 hospitals in the USA, Canada, Europe, Australia, and Asia. We enrolled patients aged 18 years or older with spontaneous, non-traumatic, supratentorial intracerebral haemorrhage of 30 mL or more. We used a computer-generated number sequence with a block size of four or six to centrally randomise patients to image-guided MISTIE treatment (1·0 mg alteplase every 8 h for up to nine doses) or standard medical care. Primary outcome was good functional outcome, defined as the proportion of patients who achieved a modified Rankin Scale (mRS) score of 0-3 at 365 days, adjusted for group differences in prespecified baseline covariates (stability intracerebral haemorrhage size, age, Glasgow Coma Scale, stability intraventricular haemorrhage size, and clot location). Analysis of the primary efficacy outcome was done in the modified intention-to-treat (mITT) population, which included all eligible, randomly assigned patients who were exposed to treatment. All randomly assigned patients were included in the safety analysis. This study is registered with ClinicalTrials.gov, number NCT01827046.

Findings: Between Dec 30, 2013, and Aug 15, 2017, 506 patients were randomly allocated: 255 (50%) to the MISTIE group and 251 (50%) to standard medical care. 499 patients (n=250 in the MISTIE group; n=249 in the standard medical care group) received treatment and were included in the mITT analysis set. The mITT primary adjusted efficacy analysis estimated that 45% of patients in the MISTIE group and 41% patients in the standard medical care group had achieved an mRS score of 0-3 at 365 days (adjusted risk difference 4% [95% CI -4 to 12]; p=0·33). Sensitivity analyses of 365-day mRS using generalised ordered logistic regression models adjusted for baseline variables showed that the estimated odds ratios comparing MISTIE with standard medical care for mRS scores higher than 5 versus 5 or less, higher than 4 versus 4 or less, higher than 3 versus 3 or less, and higher than 2 versus 2 or less were 0·60 (p=0·03), 0·84 (p=0·42), 0·87 (p=0·49), and 0·82 (p=0·44), respectively. At 7 days, two (1%) of 255 patients in the MISTIE group and ten (4%) of 251 patients in the standard medical care group had died (p=0·02) and at 30 days, 24 (9%) patients in the MISTIE group and 37 (15%) patients in the standard medical care group had died (p=0·07). The number of patients with symptomatic bleeding and brain bacterial infections was similar between the MISTIE and standard medical care groups (six [2%] of 255 patients vs three [1%] of 251 patients; p=0·33 for symptomatic bleeding; two [1%] of 255 patients vs 0 [0%] of 251 patients; p=0·16 for brain bacterial infections). At 30 days, 76 (30%) of 255 patients in the MISTIE group and 84 (33%) of 251 patients in the standard medical care group had one or more serious adverse event, and the difference in number of serious adverse events between the groups was statistically significant (p=0·012).

Interpretation: For moderate to large intracerebral haemorrhage, MISTIE did not improve the proportion of patients who achieved a good response 365 days after intracerebral haemorrhage. The procedure was safely adopted by our sample of surgeons.

Funding: National Institute of Neurological Disorders and Stroke and Genentech.

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Figures

Figure 1:
Figure 1:. Trial profile.
*All randomly assigned patients (n=506) were included in safety analyses and sensitivity analyses. Loss to follow-up occurred when the patient could not be contacted. Withdrawal occurred when the patient or family refused to complete the planned follow-up. †Patients were randomly assigned in error and thus were excluded.
Figure 2:
Figure 2:. Independently adjudicated functional outcomes at 365 days post stroke in the modified intention-to-treat analysis set
mRS scores range from 0 (no disability) to 6 (death); eGOS scores range from 8 (upper good recovery) to 1 (death). GR=good recovery. MD=moderate disability. SD=severe disability. VS=vegetative state. The proportion of 365-day mRS 0–3 was 110 (44.2%) in the MISTIE group vs 100 (41.7%) in the medical group. mRS 4–6 was 139 (55.8%) in the MISTIE group and 140 (58.3%) in the medical group. mRS scores were missing for 10 out of 499 patients; of the 10, 6 subjects were lost to follow-up, and 4 refused further participation in the study. The proportion of 365-day eGOS 4–8 (upper severe disability through upper good recovery) was 94 (38.5%) in the MISTIE group vs 84 (35.9%) in the medical group. eGOS scores 1–3 (lower severe disability through death) were 150 (61.5%) in the MISTIE group and 150 (64.1%) in the medical group. eGOS scores were missing for 21 out of 499 patients, out of which 11 completed the study with no eGOS reported, 6 were lost to follow-up, and 4 refused further participation. See appendix for detailed ordinal measures for mRS and eGOS.
Figure 3:
Figure 3:. Kaplan-Meier survival estimates from day of randomisation to observed day of death with truncation at day 365
Estimated survival probabilities were higher throughout 365 days of follow-up with MISTIE compared to medical treatment (p=0.084). Shading shows 95% CI.
Figure 4:
Figure 4:. Subgroup analyses.
Forest plot of interaction terms, adjusted for age, sex, race, intracerebral haemorrhage location, intracerebral haemorrhage stability, time from stroke to treatment initiation, and GCS score (mild, moderate, severe) at presentation. The test for homogeneity of treatment effect (based on testing for interaction) was not rejected at α level 0·05. The size of points indicates the relative sizes of the subgroups. GCS scores range from 15 (fully conscious) to 3 (deep coma). sICH=stability intracerebral haemorrhage. GCS=Glasgow Coma Scale.

Comment in

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