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10th January 2022
The subsequent stroke risk among those who experience a transient ischaemic attack (TIA) is higher in patients seen at an emergency department compared to those seen at a rapid-access TIA clinic according to a meta-analysis by a team from the Neurology Department, Neuroscience Institute, Geisinger Health System, Pennsylvania, US.
After a TIA, the ischaemic stroke risk can range from 2.4% within 2 days to 4.7% within 90 days although the authors of this study hint that this risk may have reduced in the last two decades. Although patients with a suspected stroke might normally visit a hospital, the availability of 24-hour TIA clinics with immediate initiation of preventive treatment, have the potential to greatly reduce length of hospital stay.
Despite the presence of TIA clinics there is currently little is known about the outcomes for those experiencing a TIA who have been treated in different care settings. For the present study, the US team performed a meta-analysis to estimate and compare the risk of a subsequent ischaemic stroke in those with a TIA or minor ischaemic stroke (mIS) who received their care at either a rapid access TIA clinic, an inpatient unit, emergency departments (EDs) or other settings.
The researchers focused on the subsequent stroke risk after 4 defined time periods; 2, 7, 30 and 90 days. Their literature search covered medline, Embase, CINAHL and clinical trial databases for studies that provided information on the occurrence of an ischaemic stroke after a TIA or mIS and included both retrospective and prospective studies.
The primary outcome of the study was the proportion of early ischaemic strokes after the index TIA or mIS among patients receiving care in the four different settings and they focused their comparison on a TIA clinic vs inpatient facilities.
A total of 71 studies were included in the final analysis with 226,683 patients, 5636 from a TIA clinic, 130,136 inpatients, 3605 emergency department patient and 87,303 from a unspecified centre. The mean age of patients ranged from 65.7 to 78.3 years and proportion of male patients from 38.4% to 52.4%.
The stroke risk after a TIA or mIS at a TIA clinic was 0.3% within 2 days, 1% within 7 days, 1.3% after 30 days and 2.1% after 90 days. The highest risk was for patients treated at unspecified settings and which ranged from 2.2 % within 2 days to 6% within 90 days.
When comparing the stroke risk between a TIA clinic or inpatient facility, there was no significant difference in any of the 4 time intervals. However, the risks were significantly higher among those receiving emergency department care compared to a TIA clinic within 2, 7 and 90 days.
The authors concluded that the risk of subsequent stroke among patients who were evaluated in a TIA clinic was not higher than among those hospitalised adding that patients treated in an emergency department without further follow-up had a higher risk of subsequent stroke.
Shahjouei S et al. Risk of Subsequent Stroke Among Patients Receiving Outpatient vs Inpatient Care for Transient Ischemic Attack: A Systematic Review and Meta-analysis JAMA Netw Open 2022