Cerebral microbleeds and intracranial haemorrhage risk in patients anticoagulated for atrial fibrillation after acute ischaemic stroke or transient ischaemic attack (CROMIS-2):a multicentre observational cohort study

Wilson, Duncan and Ambler, Gareth and Shakeshaft, Clare and Brown, Martin M. and Charidimou, Andreas and Al-Shahi Salman, Rustam and Lip, Gregory Y.H. and Cohen, Hannah and Banerjee, Gargi and Houlden, Henry and White, Mark J. and Yousry, Tarek A. and Harkness, Kirsty and Flossmann, Enrico and Smyth, Nigel and Shaw, Louise J. and Warburton, Elizabeth and Muir, Keith W. and Jäger, Hans Rolf and Werring, David J. and Aeron-Thomas, John and Aghoram, Prasanna and Amis, Elaine and Anderton, Peter and Andole, Sreeman and Anwar, Ijaz and Bamford, John and Banaras, Azra and Barry, Aian and Bellfied, Ruth and Benford, Aienne and Bhalla, Ajay and Bhargava, Maneesh and Bhaskaran, Biju and Bhupathiraju, Neelima and Birns, Jonathan and Blight, Aian and Bowring, Angie and Brown, Ellen and Bruce, David and Buck, Amanda and Bunworth, Kerry and Burger, Ilse and Burgess, Laura and Burn, Mathew and Burssens, Evelyn and Burton, Mauian and Emsley, Hedley and Wilson, David and Young, Emma (2018) Cerebral microbleeds and intracranial haemorrhage risk in patients anticoagulated for atrial fibrillation after acute ischaemic stroke or transient ischaemic attack (CROMIS-2):a multicentre observational cohort study. The Lancet Neurology, 17 (6). pp. 539-547. ISSN 1474-4422

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Background: Cerebral microbleeds are a potential neuroimaging biomarker of cerebral small vessel diseases that are prone to intracranial bleeding. We aimed to determine whether presence of cerebral microbleeds can identify patients at high risk of symptomatic intracranial haemorrhage when anticoagulated for atrial fibrillation after recent ischaemic stroke or transient ischaemic attack. Methods: Our observational, multicentre, prospective inception cohort study recruited adults aged 18 years or older from 79 hospitals in the UK and one in the Netherlands with atrial fibrillation and recent acute ischaemic stroke or transient ischaemic attack, treated with a vitamin K antagonist or direct oral anticoagulant, and followed up for 24 months using general practitioner and patient postal questionnaires, telephone interviews, hospital visits, and National Health Service digital data on hospital admissions or death. We excluded patients if they could not undergo MRI, had a definite contraindication to anticoagulation, or had previously received therapeutic anticoagulation. The primary outcome was symptomatic intracranial haemorrhage occurring at any time before the final follow-up at 24 months. The log-rank test was used to compare rates of intracranial haemorrhage between those with and without cerebral microbleeds. We developed two prediction models using Cox regression: first, including all predictors associated with intracranial haemorrhage at the 20% level in univariable analysis; and second, including cerebral microbleed presence and HAS-BLED score. We then compared these with the HAS-BLED score alone. This study is registered with ClinicalTrials.gov, number NCT02513316. Findings: Between Aug 4, 2011, and July 31, 2015, we recruited 1490 participants of whom follow-up data were available for 1447 (97%), over a mean period of 850 days (SD 373; 3366 patient-years). The symptomatic intracranial haemorrhage rate in patients with cerebral microbleeds was 9·8 per 1000 patient-years (95% CI 4·0–20·3) compared with 2·6 per 1000 patient-years (95% CI 1·1–5·4) in those without cerebral microbleeds (adjusted hazard ratio 3·67, 95% CI 1·27–10·60). Compared with the HAS-BLED score alone (C-index 0·41, 95% CI 0·29–0·53), models including cerebral microbleeds and HAS-BLED (0·66, 0·53–0·80) and cerebral microbleeds, diabetes, anticoagulant type, and HAS-BLED (0·74, 0·60–0·88) predicted symptomatic intracranial haemorrhage significantly better (difference in C-index 0·25, 95% CI 0·07–0·43, p=0·0065; and 0·33, 0·14–0·51, p=0·00059, respectively). Interpretation: In patients with atrial fibrillation anticoagulated after recent ischaemic stroke or transient ischaemic attack, cerebral microbleed presence is independently associated with symptomatic intracranial haemorrhage risk and could be used to inform anticoagulation decisions. Large-scale collaborative observational cohort analyses are needed to refine and validate intracranial haemorrhage risk scores incorporating cerebral microbleeds to identify patients at risk of net harm from oral anticoagulation. Funding: The Stroke Association and the British Heart Foundation.

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Journal Article
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The Lancet Neurology
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05 Nov 2018 12:02
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01 Jul 2020 05:09