Clinical Report: Non-obstructive Left Atrial Membrane Without Fenestration

Overview

This case study presents a 23-year-old woman with a non-obstructive left atrial membrane characterized by multimodal imaging. Over three years of follow-up, the patient remained asymptomatic with no evidence of hemodynamic compromise or arrhythmias.

Background

Left atrial membranous anomalies are rare congenital defects that can mimic more severe conditions like cor triatriatum. Accurate diagnosis is crucial as these anomalies may not always lead to functional obstruction, impacting management strategies. Enhanced imaging techniques are essential for distinguishing between obstructive and non-obstructive variants.

Data Highlights

No significant numerical data or trial data presented in the article.

Key Findings

• A 23-year-old woman presented with a non-obstructive left atrial membrane.
• Transesophageal echocardiography revealed a membrane without transmembranous flow.
• Normal mitral inflow and pulmonary venous Doppler patterns were observed.
• Conservative management was adopted due to the absence of obstruction or hemodynamic compromise.
• Three-year follow-up showed no arrhythmias or thromboembolic events.

Clinical Implications

This case emphasizes the importance of multimodal imaging in evaluating left atrial anomalies to avoid unnecessary interventions. Clinicians should consider conservative management for non-obstructive cases, as they may not present significant clinical risks.

Conclusion

The findings highlight that anatomical continuity in left atrial membranes does not equate to functional obstruction, underscoring the need for thorough imaging assessments in congenital heart disease.

Related Resources & Content

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2. Clinical Research in Cardiology, 2020 -- Reduction of cardiac amyloid burden observed through cardiovascular magnetic resonance
3. Frontiers in Cardiovascular Medicine -- Case Report: Catheter ablation of atrial fibrillation in a patient with cor triatriatum sinistrum
4. Clinical Research in Cardiology -- Frequency and Determinants of Atrial Fibrillation After Transcatheter Interatrial Septal Closure
5. Cor Triatriatum Sinister in a 34-Year-Old Woman - PMC
6. The role of multi-modality imaging for the assessment of left atrium and left atrial appendage - EACVI, EHRA
7. 2025 ACC/AHA/HRS/ISACHD/SCAI Guideline for the Management of Adults With Congenital Heart Disease - American College of Cardiology
8. Cor Triatriatum Sinister in a 34-Year-Old Woman - PMC
9. The role of multi-modality imaging for the assessment of left atrium and left atrial appendage: a clinical consensus statement of the European Association of Cardiovascular Imaging (EACVI), European Heart Rhythm Association (EHRA) of the European Society of Cardiology (ESC)
10. 2025 ACC/AHA/HRS/ISACHD/SCAI Guideline for the Management of Adults With Congenital Heart Disease - American College of Cardiology