What is indicated by the graph on the contrast injector after the start of a bolus?

The graph on the contrast injector after the start of a bolus primarily provides information about the pressure in the veins. Monitoring pressure is crucial during contrast injections, especially in imaging studies, as it reflects how the contrast is being delivered into the vascular system. Elevated pressure readings can indicate that the contrast is entering the bloodstream effectively, while low pressure might suggest potential complications, such as a leak or obstruction.

In this context, attributes such as temperature, speed of flow, and the amount of contrast injected are important considerations in the administration of contrast agents, but they are typically monitored or calculated through other mechanisms or parameters rather than directly indicated on a pressure graph. The pressure data helps to ensure that the injection is proceeding safely and effectively.