A novel single-beat approach to assess right ventricular systolic function

Area of Science:

• Cardiology
• Pulmonary Hypertension Research
• Medical Imaging and Diagnostics

Background:

• Assessing right ventricular (RV) contractility is crucial for managing pulmonary arterial hypertension (PAH).
• Current methods for evaluating RV contractility, particularly end-systolic elastance (Ees), lack robustness and are prone to variability.
• A reliable clinical method for RV contractility assessment is needed to improve patient care in PAH.

Purpose of the Study:

• To develop and validate a novel, clinically viable single-beat method for assessing RV contractility (Ees).
• To reduce uncertainty and interobserver variability in estimating maximum isovolumic pressure (Piso), a key parameter in single-beat methods.
• To compare the performance of the novel method against an established single-beat technique using clinical data.

Main Methods:

• A new single-beat method was developed, incorporating more RV pressure data and minimizing operator adjustments.
• Data from right heart catheterizations of PAH patients (multicenter prospective and single-center retrospective studies) were used.
• Three independent observers estimated Piso using both the established (first derivative) and novel (second derivative) methods.

Main Results:

• The novel method showed strong linear correlation with the established method for Piso estimation (R²=0.74 and R²=0.91).
• The novel method significantly reduced interobserver variability (P < 0.001) compared to the established method.
• The novel method demonstrated nonsignificant differences between observers and a narrower confidence interval for Piso.

Conclusions:

• The novel single-beat method provides a more reliable assessment of RV contractility (Ees) in PAH patients.
• Reduced uncertainty and interobserver variability enhance the clinical utility of this new methodology.
• This approach has the potential to improve the clinical management and monitoring of systolic function in PAH.