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如果有興趣的話哈哈....

intermittent IV medication = piggyback medication 
= secondary medication = mini bag medication

Sometimes an IV medication or fluid is given continuously, or all the time. But sometimes we may want to administer an IV fluid and/or medication to a patient only at specific times; this is called an intermittent IV infusion. 

If a patient is receiving continuous IV fluids and/or medication and in addition must receive a second kind of intermittent infusion, or if a patient's current IV infusion must be interrupted in order to administer a second IV medication or fluid that is...

如果有興趣的話哈哈....

intermittent IV medication = piggyback medication 
= secondary medication = mini bag medication

Sometimes an IV medication or fluid is given continuously, or all the time. But sometimes we may want to administer an IV fluid and/or medication to a patient only at specific times; this is called an intermittent IV infusion. 

If a patient is receiving continuous IV fluids and/or medication and in addition must receive a second kind of intermittent infusion, or if a patient's current IV infusion must be interrupted in order to administer a second IV medication or fluid that is more pressing, then we will need to hang a secondary IV for the patient. A secondary IV, also know as IV Piggyback, and abbreviated IVPB, is a second IV medication or fluid that is hung alongside the first and which is attached to the first set of IV tubing through one of the injection ports that is below the drip chamber of the primary IV (if we were to connect it through the injection port inside the primary IV bag, the contents of the primary and secondary IVs would mix and infuse at the same time, which is not what we want).

A secondary IV is usually used for medications and usually contains a smaller volume than the primary IV; secondary IV bags are usually 50-250 mL, while the most frequently used primary IV bags are 500 or 1000 mL. Generally a secondary IV is an intermittent medication that we want to interrupt the administration of the primary IV medication or fluids given continuously, and then we want the primary IV to resume infusing after the secondary IV has finished. Because we want the secondary IV to infuse first, we must hang the secondary IV higher than the primary IV.
the pressure on the secondary IV bag will be greater than the pressure on the primary IV bag, and so this pressure will push it down into the tubing and prevent any of the fluid from the primary IV from entering the tubing until the secondary IV has emptied. Then, once the secondary IV has finished infusing, the primary IV will be able to go down into the tubing again, and the infusion of the primary IV will resume. 

幫樓上懶人包兼翻譯

有時候我們會想持續的IV給藥,但有時候我們會想在指定時間IV給藥,也就是間歇性給藥( intermittent IV infusion. )

間歇性給藥(intermittent IV medication)aka (piggyback medication) aka ( secondary medication) aka (mini bag medication) 就是用在正在輸注的病人,但是又臨時需要給另一種藥的狀況，這時候就需要piggyback,畢竟我們不希望把第一和第二種IV的藥同時混在一起

通常第二種IV給藥會比第一種還要小(50~250mL vs 500或1000mL),因為我們會希望先給第二種藥,所以會把第二種藥掛得比第一種更高(重力讓壓力比較大的的概念)