Related Experiment Video
Updated: Jan 15, 2026
Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
Published on: July 20, 2022
Left atrial mechanical function and clinical performance in non-dilated versus dilated cardiomyopathy
Özden Seçkin1, Serkan Ünlü1, Gülten Taçoy Aydoğdu1
1Gazi University Hospital Cardiology Department, Ankara, Türkiye.
Insights
Non-dilated left ventricular cardiomyopathy (NDLVC) patients show better left atrial (LA) conduit strain than dilated cardiomyopathy (DCM) patients. This LA strain is a key predictor of exercise capacity in these heart conditions.
Area of Science:
- Cardiology
- Cardiovascular Imaging
- Heart Failure Research
Background:
- Non-dilated left ventricular cardiomyopathy (NDLVC) presents with reduced ejection fraction but normal chamber size, distinguishing it from dilated cardiomyopathy (DCM).
- The clinical and structural characteristics of NDLVC are not fully understood, necessitating further investigation into its pathophysiology and differentiation from DCM.
Purpose of the Study:
- To compare left atrial (LA) phasic strain parameters between NDLVC and DCM patients with similar ejection fractions.
- To evaluate the relationship between LA function and exercise capacity, assessed by the 6-minute walk test (6MWT).
Main Methods:
- A prospective observational study enrolled 83 patients with non-ischemic systolic dysfunction (51 NDLVC, 32 DCM).
- Comprehensive transthoracic echocardiography with speckle-tracking imaging was used for LA strain analysis (reservoir, conduit, contractile phases).
- Functional capacity was measured using the 6-minute walk test (6MWT).
Main Results:
- NDLVC patients demonstrated significantly higher LA reservoir and conduit strain compared to DCM patients.
- LA conduit strain strongly correlated with 6MWT distance (r=0.42, p=0.002).
- LA conduit strain was identified as the sole independent predictor of functional capacity in multivariable analysis.
Conclusions:
- Left atrial conduit strain effectively differentiates between NDLVC and DCM, reflecting distinct functional and structural profiles.
- The strong association of LA conduit strain with exercise capacity suggests its utility in clinical assessment and follow-up for non-ischemic cardiomyopathy.
- Preserved LA conduit function in NDLVC may indicate a less hemodynamically burdened atrium, correlating with better clinical outcomes and functional capacity.
Background:
Non-dilated left ventricular cardiomyopathy (NDLVC) is a distinct entity characterized by impaired left ventricular ejection fraction despite normal chamber dimensions. While it may represent an earlier or less fibrotic stage of non-ischemic cardiomyopathy compared to dilated-cardiomyopathy (DCM), its clinical and structural characterization remains incomplete.
Objectives:
This study aimed to compare left atrial (LA) phasic strain parameters between patients with NDLVC and those with DCM, all with similarly reduced ejection fractions. Additionally, the relationship between LA function and exercise capacity was assessed using the 6-minute walk test (6MWT).
Methods:
In this prospective, observational study, 83 patients with non-ischemic systolic dysfunction were enrolled(NDLVC:n = 51; DCM:n = 32). All underwent comprehensive transthoracic echocardiography, including LA strain analysis (reservoir, conduit, contractile phases) using speckletracking imaging. Functional capacity was evaluated via 6MWT.
Results:
Patients with NDLVC exhibited significantly higher LA reservoir and conduit strain values than those with DCM. Among all echocardiographic parameters, LA conduit strain showed the strongest correlation with 6MWT distance (r = 0.42, p = 0.002) and was the only independent predictor of functional capacity in multivariable analysis.
Conclusions:
LA conduit strain is a promising noninvasive parameter for identifying functional and structural differences between NDLVC and DCM. Its strong association with exercise capacity and ability to differentiate phenotypes may support its integration into clinical assessment and follow up,particularly in clarifying structural and functional differences in non-ischemic remodeling patterns. These findings suggest that preserved LA conduit function in NDLVC may reflect a less hemodynamically burdened atrial profile, which is consistent with better clinical performance and functional capacity.
Related Concept Videos
01:30Cardiomyopathy II: Dilated Cardiomyopathy
01:29Cardiomyopathy V: Interprofessional Care
01:29Cardiomyopathy III: Hypertrophic Cardiomyopathy
01:23Mitral Stenosis II: Clinical features and Diagnostic Tests
01:29Heart Failure II: Pathophysiology
01:29Pathophysiology of Cardiac Performance