Why In An Intra Arterial Injection Is There A Minimum First Pass Metabolism?

Based upon research it appears that, in Intra Arterial Injections a minimum first-pass metabolism occurs based upon the route of the administered drug and the drug distribution process within the body of the patient. The amount of the first-pass metabolism depends upon blood flow to the liver. The liver's ability to eliminate the drug is not always equal to the rate, by which the drug is coming to the liver. Other factors could be protein binding in plasma and tissue absorption, however this is not believed to be detrimental to the therapeutic value of the drug. All of this could then mean, there is not always a minimum first-pass metabolism.

The organ where first-pass metabolism takes place is normally, the liver however, it can be in the lungs, the intestine, pancreas, even the vein in the arm of the injection sight.

If you enter (intra arterial injections/minimum first pass metabolism) into your search bar, you will find many articles on the topic of first-pass metabolism, and research articles dealing with this subject. There are varying opinions based on the type of research, the drug used, the research subjects, and more. It appears the main idea most agree upon is, the liver is the dominant organ of first-pass metabolism.

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