Key result
The late-systolic distance between the mitral leaflet tip and ventricular septum (TIS) accurately identified left ventricular outflow tract obstruction in HCM (AUC 0.91; 95% CI 0.87-0.96).
Why the study?
Echocardiographic diagnosis of left ventricular outflow tract obstruction in HCM often requires extensive provocative manoeuvres, prompting investigation into whether resting echocardiography-derived parameters can determine its presence.
Does the late-systolic distance between mitral leaflet tip and ventricular septum (TIS) measured by resting echocardiography accurately identify left ventricular outflow tract obstruction in patients with hypertrophic cardiomyopathy?
Cross-Sectional (n=142)
Blinded measurement
No
Does the late-systolic distance between mitral leaflet tip and ventricular septum (TIS) measured by resting echocardiography accurately identify left ventricular outflow tract obstruction in patients with hypertrophic cardiomyopathy?
Effect estimate: AUC 0.91 (95% CI 0.87-0.96)
The novel resting echocardiographic parameter TIS (late-systolic distance between mitral leaflet tip and ventricular septum) shows high diagnostic accuracy for identifying left ventricular outflow tract obstruction in hypertrophic cardiomyopathy, potentially reducing the need for extensive provocative maneuvers.
TIS may aid LVOTO identification; hypothesis-generating and requires prospective validation before clinical use.
AIMS: Echocardiographic diagnosis of left ventricular outflow tract obstruction (LVOTO) in hypertrophic cardiomyopathy (HCM) often requires extensive provocative manoeuvers. We investigated, whether echocardiography-derived parameters obtained at rest can aid to determine the presence of LVOTO in persons with HCM. METHODS AND RESULTS: Consecutive patients with HCM admitted to a referral centre underwent standardized transthoracic echocardiographic examination including provocative manoeuvers. Under resting conditions, the length of mitral leaflets and distances between mitral valve coordinates and ventricular walls were blindly measured in parasternal long axis (PLAX) and apical three-chamber (3ch) views, both at early and late systole. Among 142 patients (mean age 59 ± 13 years, 42% women), 68 (42%) had resting or provocable LVOTO with maximal LVOT gradients ≥30 mmHg. Late-systolic distance between mitral leaflet tip and ventricular septum (TIS) was measurable in 137 participants (96%) in 3ch view and independently associated with LVOTO in multivariable logistic regression analysis. The area under the ROC curve of TIS for the identification of LVOTO was 0.91 [95% confidence interval (CI) 0.87-0.96]. TIS ≤ 14 mm yielded 97% sensitivity and 57% specificity regarding LVOTO. TIS >14 mm ruled out LVOTO with a negative predictive value of 95%. TIS ≤9 mm ruled in LVOTO with a positive predictive value of 92% (sensitivity 73%, specificity 95%). Among 43 patients with TIS between 10 and 14 mm, 35% had LVOTO. CONCLUSION: In our study, the novel echocardiographic parameter TIS showed high negative and positive predictive values for LVOTO in HCM. These exploratory results await confirmation in larger collectives and prospective investigations.
No takes yet. Share an insight, caveat, or question.
Verheyen et al. (2023) conducted a cross-sectional in Hypertrophic cardiomyopathy (HCM) (n=142). Late-systolic distance between mitral leaflet tip and ventricular septum (TIS) was evaluated on Identification of left ventricular outflow tract obstruction (LVOTO) (AUC 0.91, 95% CI 0.87-0.96). The late-systolic distance between the mitral leaflet tip and ventricular septum (TIS) accurately identified left ventricular outflow tract obstruction in HCM (AUC 0.91; 95% CI 0.87-0.96).
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: