Left atrial volume in chronic obstructive pulmonary disease

Area of Science:

• Pulmonary Medicine
• Cardiology
• Radiology

Background:

• Emphysema, a component of chronic obstructive pulmonary disease (COPD), involves destruction of lung capillaries.
• Reduced pulmonary venous return can impact left atrial (LA) volume and left ventricular preload.
• Investigating the relationship between emphysema severity and LA volume may offer insights into cardiopulmonary interactions.

Purpose of the Study:

• To evaluate left atrial (LA) volume in smokers based on emphysema severity.
• To explore the association between emphysema and LA volume as indirect evidence of altered pulmonary venous return.
• To investigate the correlation between computed tomography (CT) quantified emphysema and LA volume.

Main Methods:

• 121 smokers underwent high-pitch, high-temporal resolution CT angiography.
• Quantification of emphysema, total lung volume, and body surface area-indexed LA volume was performed.
• Patients were categorized into four CT phenotype groups: emphysema predominant, airway predominant, mixed, and normal.

Main Results:

• A negative correlation was observed between indexed LA volume and emphysema severity in the overall group (P=0.032) and emphysema-predominant group (P=0.0163).
• Indexed LA volume also negatively correlated with total lung volume in the overall (P=0.039) and emphysema-predominant groups (P=0.048).
• No significant correlations were found in the airway-predominant group or the mixed pattern group.

Conclusions:

• Indexed left atrial (LA) volume is significantly correlated with the severity of emphysema in smokers.
• This relationship suggests that emphysema-related capillary destruction may reduce pulmonary venous return, affecting LA volume.
• Findings highlight a potential link between lung structure changes in emphysema and cardiac dimensions.