Close the clamp as soon as filling is complete. If you pull back on the syringe plunger too hard the plunger can actually be pulled out of the syringe. Be careful not to over fill. When the clamp is opened, the syringe will continue to fill. A one way valve prevents aspiration of blood or backward flow during syringe filling.
Press start on the bedside monitor.
To cardiac output measurement program. By the time the injection reaches the patient, the patient will be almost at end exhalation. Ensures consistency from measurement to measurement. Intrathoracic pressures are most stable during exhalation and will have the least influence on cardiac output. Immediately inject entire syringe volume using a steady, continuous pressure.