Related Experiment Video
Updated: Jun 20, 2026
09:59
A Magnetic Resonance Imaging Protocol for Stroke Onset Time Estimation in Permanent Cerebral Ischemia
Published on: September 16, 2017
14.6K
Predicting 1-Year Stroke Recurrence and Mortality in Stable Outpatients Following Ischemic Stroke and Transient
Alisia Southwell1, Anne Marie Liddy2, Anna Chu3
1Evaluative Clinical Sciences Platform, https://ror.org/03dbr7087Sunnybrook Research Institute, Toronto, ON, Canada.
Summary
Predicting stroke recurrence and mortality in outpatient settings is challenging. Demographic and medical history data showed low predictive accuracy, highlighting the need for new approaches to secondary stroke prevention.
Area of Science:
- Neurology
- Epidemiology
- Public Health
Background:
- Patients surviving stroke or transient ischemic attack (TIA) face significant early risks of mortality and morbidity.
- Existing risk prediction tools are primarily designed for post-hospital discharge, not for patients attending outpatient follow-up.
- This study investigates the predictability of 1-year stroke recurrence and mortality using demographic and medical history data in an outpatient setting.
Purpose of the Study:
- To evaluate the effectiveness of demographic and medical history data in predicting 1-year stroke recurrence and all-cause mortality.
- To assess the predictive accuracy of models in patients who have survived stroke or TIA and are attending outpatient follow-up.
- To identify potential gaps in current risk prediction for secondary stroke prevention.
Main Methods:
- Utilized data from the Ontario Stroke Registry, including 13,848 stroke and 13,059 TIA patients, linked to administrative databases.
- Employed multivariable regression models, with two-thirds of each cohort for model derivation and one-third for validation.
- Analyzed demographic factors, medical history, and clinical outcomes including stroke recurrence and mortality.
Main Results:
- Reported 2.71% recurrent strokes in the ischemic stroke cohort and 3.44% in the TIA cohort at one year.
- Identified increasing age and prior stroke/TIA as risk factors for recurrence in both cohorts.
- Found modest predictive accuracy for stroke recurrence (AUC 0.59) and moderate accuracy for mortality (C-statistics 0.74-0.78) in validation cohorts.
Conclusions:
- The predictive accuracy of the developed models for stroke recurrence was low, even after considering multiple risk factors.
- Additional risk factors specific to outpatient stroke clinic populations need to be identified.
- Innovative strategies for individualized secondary stroke prevention are essential for improving patient outcomes.
Related Concept Videos
01:15Ischemic Stroke l: Introduction
Ischemic stroke is an acute cerebrovascular condition in which blood flow to a brain region is suddenly interrupted, leading to tissue infarction. Neurons depend on continuous oxygen and glucose supply, so even brief reductions in perfusion cause energy failure, ionic imbalance, and irreversible injury. Ischemic strokes are classified into thrombotic and embolic types based on their underlying mechanisms.Thrombotic MechanismsThrombotic stroke develops when a clot forms within a cerebral artery.
01:15Ischemic Stroke ll: Pathophysiology
An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...
01:26Transient Ischemic Attack l: Introduction
A transient ischemic attack (TIA) is a brief episode of neurological dysfunction caused by a temporary, focal reduction in cerebral blood flow. Although symptoms resemble those of an ischemic stroke, the interruption in perfusion is short-lived and does not cause permanent infarction. TIAs are clinically important because they often serve as early warning events for future stroke.Mechanisms of Transient Cerebral IschemiaTransient cerebral ischemia may arise through several mechanisms. One...