Agreement between different non-invasive methods of ventricular elastance assessment for the monitoring of ventricular-arterial coupling in intensive care.

Ventricular-arterial coupling is calculated as the arterial elastance to end systolic elastance ratio (E/Ees). Although the gold standard is invasive pressure volume loop analysis, Chen method is the clinical reference non-invasive method for estimating end systolic elastance (Ees). Several simplified methods calculate Ees from the end systolic pressure to volume ratio (ESP/ESV).