ventricular-arterial coupling
The mechanical interaction between left ventricular contractility and arterial load, optimized when the ratio approximates 1.0.
Full Definition
Ventricular-arterial coupling describes the matching between ventricular contractile function and the arterial system's impedance to ejection. It is quantified as the ratio of arterial elastance (Ea) to ventricular elastance (Ees), with optimal mechanical efficiency occurring when Ea/Ees equals approximately 1.0. During cardiac anesthesia, this coupling can be significantly altered by anesthetic agents, surgical manipulation, and hemodynamic interventions. Understanding this relationship helps optimize inotropic and vasopressor therapy, particularly during weaning from cardiopulmonary bypass when both ventricular function and vascular tone may be compromised.
Usage
Usage note: Hyphenate the compound term; use 'VA coupling' as acceptable abbreviation.
In Context
- "Poor ventricular-arterial coupling post-bypass necessitated combined inotropic and afterload reduction therapy." — Operative note
- "The patient's VA coupling ratio of 2.1 indicated suboptimal mechanical efficiency requiring intervention." — Hemodynamic assessment