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[Giant left atrium combined with mitral valvular disease: morphologic classification and its clinical significance]
Weiyong Yu1, Baoren Zhang, Jiahua Hao
1Department of Cardiothoracic Surgery, Changhai Hospital, Second Military Medical University, Shanghai 200433, China.
Insights
This study classifies giant left atrium (GLA) morphology in patients with mitral valve disease. The classification aids in understanding pathophysiological changes and selecting surgical procedures for GLA.
Area of Science:
- Cardiology
- Radiology
- Medical Imaging
Context:
- Giant left atrium (GLA) is a serious condition often associated with mitral valvular disease.
- Accurate morphological classification of GLA is crucial for understanding its pathophysiology and guiding treatment.
- Previous classification methods may not fully capture the complex morphology of GLA.
Purpose:
- To develop and validate a novel morphologic classification system for giant left atrium (GLA).
- To investigate the clinical significance of this classification in patients with mitral valvular disease.
- To correlate morphological subtypes with potential pathophysiological changes and surgical approaches.
Summary:
- A classification system for GLA was developed using Q Hierarchical cluster analysis based on chest roentgenogram measurements.
- Patients were categorized into three main types (L, R, B) based on left atrial cardiothoracic ratios.
- Further subtypes (downward and upward) were defined using bronchus-to-trachea ratios, providing detailed morphologic characterization.
Impact:
- This morphologic classification of GLA may reflect underlying pathophysiological alterations.
- It can serve as a guideline for selecting optimal surgical plication procedures in patients with mitral valve disease.
- Enhanced understanding of GLA morphology can lead to improved patient outcomes and tailored surgical interventions.
Objective:
To study the morphologic classification and its clinical significance of giant left atrium (GLA) combined with mitral valvular disease.
Methods:
Between January 1993 and December 1999, a total of 62 consecutive patients with mitral valvular disease, whose preoperative left atrial endodiastolic volume index >/= 300 ml/m(2) or endosystolic diameter >/= 6.0 cm, were enrolled as research candidates. Morphologically, GLA was classified by Q Hierarchical cluster analysis according to the right or left side cardiothoracic ratio of the left atrium (r- or l-LATR) on an anteroposterior chest roentgenogram and the ratio of the distant diameter of the left main bronchus to the approximate diameter of the left main bronchus (LBDd/Dp) or to the trachea (LB/TR) on an left anterior oblique chest roentgenogram.
Results:
According to r-LATR and l-LATR, the morphology of GLA was classified clinically into three types: type L (l-LATR >/= 0.6 and r-LATR < 0.58), type R (r-LATR >/= 0.58 and l-LATR < 0.6) and type B (r-LATR >/= 0.58 and l-LATR >/= 0.6). According to LBDd/Dp and LB/TR, GLA in type L and B was further classified into two subtypes, respectively: left posterior downward type (L(I) and B(I)), in which LBDd/Dp is equal or exceeds 0.38 or LB/TR is equal or exceeds 0.33, and left posterior upward type (L(II) and B(II)), in which LBDd/Dp is less than 0.38 or LB/TR less than 0.33.
Conclusion:
The morphologic classification of GLA may represent the main pathophysiological changes of GLA and might be a guideline for the selection of the optimal plication procedures of GLA in patients with valve diseases.