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NCT Number: NCT05127941

Andexanet Alfa: Non-interventional Study in Stroke Units in Germany (DE)

The multicenter, prospective, observational, non-interventional study conducted in German Stroke Units is investigating patients with intracranial hemorrhage (ICH) under effective anticoagulation with rivaroxaban or apixaban.

The aim of the study is to analyze under routine conditions wether the volume increase of ICH under treatment with rivaroxaban and apixaban can be reduced with the antidote andexanet alfa. Thus, data of patients under effective treatment with rivaroxaban or apixaban and treated with andexanet alfa at baseline will be assessed at the time of onset of ICH, during the hospital stay and during a follow-up by telephone at 30 and 90 days after hospital discharge.

The main objective is defined as the change in size or volume of the hematoma by computed tomography (CT) or magnetic resonance imaging (MRI) in patients with ICH under effective treatment with rivaroxaban and apixaban, who are treated with andexanet alfa. Further objectives comprise evaluations concerning the functional status according to modified Rankin Scale (mRS), changes in the National Institutes of Health Stroke Scale (NIHSS), and occurrences of ICH or new intraventricular bleeding as well as mortality rates.

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Key information

Conditions

Intracranial Hemorrhages Brain Diseases Cardiovascular Diseases Central Nervous System Diseases Cerebrovascular Disorders Hemorrhage Nervous System Diseases Pathologic Processes Pathological Conditions, Signs and Symptoms Vascular Diseases

Age range

18 year and older

Sex eligibility

All sexes

Study type

Observational

Primary location

Medizinische Hochschule Hannover, Hanover, Germany

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Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Age ≥18 years at enrollment
  • Patients willing and able to provide written informed consent for data transmission. For patients who are not legally competent to sign this informed consent for data transmission exceptions/special cases are defined (details provided in the study protocol)
  • Patients with primary intracranial hemorrhage as confirmed with CT or MRI.
  • Patients under effective anticoagulation treatment with rivaroxaban or apixaban at the time of admission, according to the judgement of treating physician and determined using Point-of-care (PoC) anti-factor Xa (fXa) assays or laboratory-based anti-fXa measurement.
  • Patients treated with andexanet alfa
  • Signed informed consent as soon as possible after start of symptoms of initial ICH event, but before discharge

Exclusion criteria

  • Start of symptoms of initial ICH event > 24 h before admission to hospital

Treatment and study plan

Primary outcomes

  1. Change in size (specified as ml or cm^3) of the intracranial bleeding evaluated by Computed Tomography (CT) or Magnetic Resonance Imaging (MRI)

    Time frame: 12-72 hours after initial CT or MRI, further imaging in case of worsened health condition

    The primary endpoint is the change in size (specified as ml or cm^3) of the intracranial bleeding evaluated by first CT or MRI between 12-72 hours after initial CT or MRI; further imaging in case of worsened health condition

Secondary outcomes

  1. Functional status according to modified Rankin Scale (mRS)

    Time frame: before ICH, at admission, at discharge, after 30 days, and after 90 days

    Functional status acc. to modified Rankin Scale (mRS) before ICH, at admission, at discharge, after 30 days, and after 90 days. The mRS ranges from grade 0 (no symptoms) to grade 6 (dead)

  2. Mortality rate

    Time frame: after 7, 30 and 90 days und during hospital stay

    Mortality rate after 7, 30 and 90 days, and intra-hospital mortality rate

  3. Rate of worsened health condition

    Time frame: At hospital admission and additionally at 24 hours and 72 hours after admission

    Rate of worsened health condition defined as change in NIHSS of ≥4 pts compared to initial NIHSS or worsening of NIHSS level of consciousness ≥1 point or increase of the volume of the intracranial bleeding or new intraventricular bleeding or death

  4. Change in severity of stroke

    Time frame: 72 hours after admission

    Change in severity of stroke based on the National Institutes of Health Stroke Scale (NIHSS) 72 hours after admission

  5. Assessment of effective anticoagulation at baseline

    Time frame: at baseline

    Assessment of effective anticoagulation at baseline using PoC anti-fXa assay, intra-hospital decision making for Andexanet alfa administration

  6. Clinical course and outcomes of patients

    Time frame: Coagulation parameters will be recorded at hospital admission. Thrombotic events and re-bleeding will be recorded from the date of hospital admission until discharge. The average length of hospital stay is expected to be 10 days

    Hemostasis will be assessed by coagulation parameters (activated partial thrombin time (aPTT), thrombin time (TT), International Normalized Ratio (INR)) at admission, re-bleeding and thrombotic events (e.g. myocardial infarction, ischemic stroke, deep vein thrombosis) will be assessed by AE reporting performed from admission to hospital to discharge

  7. Re-dosing and re-anticoagulation therapy

    Time frame: The assessement of re-dosing and re-anticoagulation therapy will take place from the date of hospital admission until the date of discharge. The average length of hospital stay is expected to be 10 days.

    Resumption of antithrombotic therapy in hospital (incl. type, start date and dose of anticoagulation therapy)

  8. Health care resource utilization (including ICU length of stay)

    Time frame: Will be recorded during hospital stay until the date of discharge.The average length of hospital stay is expected to be 10 days.

    Data regarding ICU length of stay and on resource utilization (Intubated on arrival, Mechanical ventilation, ICH-evacuation surgery, External ventricular drainage, Intraventricular lysis, Osmotherapy)

Other outcomes

  1. Safety endpoints

    Time frame: Will be recorded at hospital admission, at 24 and 72 hours after admission, at discharge. The average length of hospital stay is expected to be 10 days (depends on the severity of disease and cannot be specifically defined).

    Assessment of non-serious Adverse Events (AEs) and Serious Adverse Events (SAEs)

Sponsors and collaborators

Lead sponsor

University Hospital, Essen

Other

Registry information

Acronym: ASTRO-DE

Important dates

Study start
2021
Primary completion
2024
Study completion
2025
First posted
Nov 19, 2021
Registry last updated
May 6, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

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This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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