Problems with Bolus and Single Port Multiple Injections

Abstract

The bolus system demonstrated by Lane et al, is easily assembled using a needle or scalp infusion set connected to a three-way stopcock attached to tubing and a large saline syringe. This bolus method is utilized for first-pass bolus injections and as a multiple injection apparatus. We load the radionuclide via the stopcock into the tubing to obtain a good bolus and we demonstrate a flushing technique when the bolus system is used as a multiple injection apparatus.

A readily accessible venous port is necessary for many purposes, therefore it is convenient to use this bolus system as a multiple injection apparatus. A noticeable positive slope occurred on a number of renal curves at the time of the Lasix injection. The positive slope was caused by flushing the residual activity from the stopcock into the patient during the Lasix injection. Therefore, a flushing technique was developed to avoid this residual activity when using the bolus system as a multiple injection apparatus.