Key result
The presence of a left atrial septal pouch was significantly associated with an increased risk of cryptogenic stroke even after adjusting for common risk factors (OR 2.37).
Why the study?
Prior studies demonstrated an increased prevalence of left atrial septal pouch in cryptogenic stroke, requiring validation in a separate, larger cohort of stroke and non-stroke patients.
Is the presence of a left atrial septal pouch (LASP) associated with an increased risk of cryptogenic stroke?
Cross-Sectional (n=306)
Blinded to patient demographics and clinical information
No
Is the presence of a left atrial septal pouch (LASP) associated with an increased risk of cryptogenic stroke?
Odds Ratio: 2.37 (95% CI 1.13–4.98)
Absolute Event Rate: 30.8% vs 17.9%
p-value: p=<0.05
The presence of a left atrial septal pouch is significantly associated with cryptogenic stroke, suggesting it may serve as an underrecognized thromboembolic source.
Does not support routine LASP screening or anticoagulation; leaves open its causal role in cryptogenic stroke.
The left atrial septal pouch (LASP) occurs due to incomplete fusion of septa primum and secundum at the inter-atrial septum, creating an open flap that may serve as a thromboembolic source. Prior studies have demonstrated increased prevalence of LASP in cryptogenic strokes. The aim of the current study was to validate the above findings in a separate, larger group of stroke and non-stroke patients. We examined transesophageal echocardiograms (TEEs) performed between July 2011 and December 2018. LASP prevalence was determined in TEEs referred for ischemic stroke or transient ischemic attack ("stroke") and compared with LASP prevalence in patients undergoing TEEs for other reasons ("non-stroke"). Stroke subtyping was performed using the Trial of Org 10172 in Acute Stroke Treatment (TOAST) criteria. There were 306 TEEs from 144 non-stroke and 162 stroke patients. Mean age and sex distribution were 56 ± 1 (mean ± SE) and 65% male in the non-stroke group and 58 ± 1 and 54% male in the stroke group. The overall prevalence of LASP was 31%. The prevalence of LASP was 28% (41/144) in non-stroke patients, 25% (24/95) in non-cryptogenic stroke patients, and 43% (29/67) in cryptogenic stroke patients. LASP prevalence was significantly higher in the cryptogenic subgroup compared with the non-cryptogenic subgroup (p = 0.02). These findings demonstrate a significant association of LASP with risk of cryptogenic stroke, suggesting that LASP may serve as a thromboembolic nidus. Additional studies are needed to determine the generalizability of these findings, and their therapeutic implications, supporting LASP as a stroke risk factor.
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Kapoor et al. (2021) conducted a cross-sectional in Stroke / Transient Ischemic Attack (n=306). Left atrial septal pouch (LASP) vs. Absence of LASP was evaluated on Cryptogenic stroke (OR 2.37, 95% CI 1.13-4.98, p=<0.05). The presence of a left atrial septal pouch was significantly associated with an increased risk of cryptogenic stroke even after adjusting for common risk factors (OR 2.37).
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