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Related Experiment Videos

[Paradoxical brain embolism].

Hideki Matsuoka1

  • 1Department of Cerebrovascular Disease, Kyushu Cardiovascular Center.

Rinsho Shinkeigaku = Clinical Neurology
|February 2, 2006
PubMed
Summary
This summary is machine-generated.

Patent foramen ovale (PFO) is a significant cause of ischemic stroke. Standardizing transesophageal echocardiography (TEE) improved right-to-left shunt (RLS) detection rates in Japanese stroke patients.

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Area of Science:

  • Neurology
  • Cardiology
  • Vascular Medicine

Background:

  • Paradoxical brain embolism due to right-to-left shunt (RLS) is a key cause of ischemic stroke, particularly in young adults.
  • Detailed characteristics of RLS and patent foramen ovale (PFO) in Japan are not well-established.
  • Previous studies may underestimate PFO frequency due to limited use of transesophageal echocardiography (TEE).

Purpose of the Study:

  • To investigate the prevalence and characteristics of PFO and RLS in Japanese acute stroke patients.
  • To evaluate the impact of standardizing TEE procedures on RLS detection rates.
  • To analyze the clinical presentation and recurrence risk of stroke associated with RLS.

Main Methods:

  • Retrospective analysis of clinical data from 7,245 acute stroke patients.

Related Experiment Videos

  • Comparison of PFO frequency between young (<40 years) and non-young (≥40 years) patient groups.
  • Implementation and evaluation of standardized contrast-enhanced TEE procedures for RLS detection.

    • Main Results:

    • PFO was more frequent in young patients (1.2%) than in non-young patients (0.7%), though not statistically significant (p=0.07).
    • Standardization of TEE procedures increased the RLS positive rate from 8.8% to 21.9% in their hospital.
    • Only 7.7% and 38.5% of RLS patients met definite and probable criteria for paradoxical brain embolism, respectively.

    Conclusions:

    • Standardized TEE significantly enhances RLS detection, revealing a higher prevalence than previously reported in Japan.
    • Stroke recurrence management in RLS patients depends on the presence of other risk factors; anticoagulation is recommended for those with additional risks, while aspirin and anticoagulation show similar efficacy for those without.
    • Further research is needed to fully elucidate the role of PFO and RLS in ischemic stroke etiology and optimize treatment strategies.