Ventricular-arterial coupling: Invasive and non-invasive assessment

Area of Science:

• Cardiovascular Physiology
• Biomedical Engineering
• Hemodynamics

Background:

• Ventricular-arterial coupling is vital for cardiovascular function, assessed via the ratio of effective arterial elastance (E_A) to LV end-systolic elastance (E_ES).
• E_A estimates arterial load, while E_ES reflects LV contractility, ideally measured invasively but estimable non-invasively.

Purpose of the Study:

• To review methods for assessing ventricular-arterial interactions.
• To highlight limitations of pressure-volume plane analyses and advocate for broader assessments.

Main Methods:

• Discussion of pressure-volume loop analysis for E_A/E_ES ratio calculation.
• Mention of single-beat methods for non-invasive E_ES estimation.
• Emphasis on comprehensive arterial load and systolic loading sequence analyses.

Main Results:

• The E_A/E_ES ratio offers insights into ventricular-arterial mechanical efficiency.
• Pressure-volume plane analyses have limitations in fully capturing ventricular-arterial coupling.
• E_A inadequately characterizes pulsatile arterial load; systolic loading sequence impacts LV function.

Conclusions:

• While the E_A/E_ES ratio is useful, it does not encompass all aspects of ventricular-arterial coupling.
• Comprehensive analysis of arterial load and systolic loading sequence provides critical incremental information.
• Broader assessment methods are needed for a complete understanding of cardiovascular mechanics.