Intermediate
Technical
IVT
contractility
The intrinsic ability of the myocardium to contract independent of preload and afterload conditions.
Full Definition
The inherent strength of myocardial contraction that reflects the heart's ability to generate force and shorten its muscle fibers, independent of loading conditions. Contractility is a fundamental determinant of cardiac performance and is often assessed using parameters such as ejection fraction, dp/dt max, or the slope of the end-systolic pressure-volume relationship. In cardiac anesthesia, contractility assessment guides the use of inotropic agents and helps predict weaning success from cardiopulmonary bypass.
Usage
Usage note: Distinguish from compliance, which refers to ventricular filling properties.
In Context
- "TEE revealed severely reduced contractility requiring high-dose inotropic support." — Anesthesia record
- "The patient's contractility improved significantly after coronary revascularization." — Postoperative assessment
Also known as
myocardial contractility
inotropic state
Contrasted with
myocardial depression
Don't confuse with
compliance
preload