Right-to-Left Shunt Evaluation in Cardiac Patent Foramen Ovale Using Bubble Contrast Transcranial Color-Coded...

Area of Science:

• Cardiology
• Neurology
• Medical Imaging

Background:

• Patent foramen ovale (PFO) diagnosis traditionally uses transcranial Doppler (TCD), a method limited by its inability to visualize vessels directly.
• TCD's reliance on qualitative assessment introduces potential errors, impacting examination reproducibility and consistency.

Observation:

• A case study involving a patient with ischemic stroke of unknown origin was presented.
• Contrast transcranial color-coded Doppler (C-TCCD) with bubble contrast was utilized for right-to-left shunt (RLS) screening.
• C-TCCD successfully identified RLS, leading to further investigation with transesophageal echocardiography (TEE).

Findings:

• TEE confirmed an 8 mm PFO, a 21 mm tunnel length, a hypermobile interatrial septum, and persistent RLS.
• The patient's high-risk PFO score was calculated at 4 points, indicating a very high-risk PFO.
• C-TCCD proved effective in screening for RLS associated with PFO.

Implications:

• C-TCCD serves as a valuable alternative for assessing RLS in PFO, particularly in cryptogenic stroke cases.
• This method enhances diagnostic accuracy for identifying the underlying causes of ischemic stroke.
• The findings highlight the importance of advanced imaging techniques in complex cardiac and neurological diagnoses.