Final answer:
ECV requires proper functioning of heart valves and muscles, preload, contractility, and afterload to operate successfully.
Step-by-step explanation:
In order to operate successfully, ECV (echocardiogram) requires several factors:
- Proper functioning of the heart valves and muscles: ECV is used to determine if these components of the heart are working correctly.
- Preload: ECV depends on the stretch of the ventricles prior to contraction. This factor is crucial for a successful operation as it affects the volume of blood the heart can pump.
- Contractility: Another important factor is the strength of the heart's contraction. Contractility determines the force with which the heart can pump blood.
- Afterload: ECV also relies on the ability of the ventricles to generate enough force to pump blood against the resistance in the vessels.