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Post by dj on Feb 29, 2012 10:51:51 GMT 10
hi tom, which method is best for injecting ( not injecting for immediate/serious problem) or does it depend on what your injecting i.e b12 or tridenson or amp 5
iv
im
or under the skin.
i assume iv is quickest(the required effect would be quicker than under skin) then im,then under skin. on the other hand would under the skin be slow release therefore lets say the b12 would be absorbed over afew days whereas iv would be absorbed in a few hours and any excess excreted. what is the time difference between the 3 methods, thanks
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Post by Tom Meulman on Feb 29, 2012 15:16:00 GMT 10
Hi dj,
The best method for injecting any substance depends entirely on the type of substance, and it is therefore essential to follow the guidelines as listed on the container.
There are some injections that should never be given intravenous as no matter how slowly they are injected can cause an extremely adverse reaction that could result in the death of the dog.
Other injections are extremely painful when injected subcutaneous due to the PH of the formula and cause a burning sensation.
In regard to absorption rates this depends on two things, one the blood supply in the area where it is injected, and two the formula of the injection.
Therefore as you can imagine an I.V. injection works virtually immediately, as it is distributed throughout the body via the blood stream.
The absorption rate of an Intra Muscular injection is a little slower but not by much as muscle tissue has an extremely good blood supply. This can of course be much slower if the injection is accidentally injected into the muscle sheaths between two muscles.
This can also have another detrimental effect because a needle is a fine tube that is cut on the angle, and it therefore not only has a sharp point but also two extremely sharp edges. So unless care is taken that an injection is injected into the body of a muscle, a needle edge sliding along the side of a muscle sheath could cause a cut in the muscle sheath.
An Intra Muscular injection given directly after exercise will be absorbed faster than after 4 hours rest, because at that time the muscle is engorged with blood, speeding up the absorbtion rate.
Because most people give I.M. injections into the main muscle of the hind limb, usually the biceps, it is important to take care not to inject into the area of sciatic nerve. Keep in mind that this nerve also passes deep under the lower part of the Gluteus (hip muscle).
So some knowledge of the main nerve paths in the body and the major blood vessels is important when injecting into muscle tissue.
In regard to Subcutaneous injections, the area directly under the skin has a poor blood supply, and any injections given into this area can take from 15 minutes to up to several hours to be absorbed into the blood supply depending on the substance.
The formula of the injection has a considerable effect on the absorption rate, as some formulations are designed to reduce the speed at which the drug is absorbed. Such as anabolic steroids or other hormones as these are generally mixed with oil, and oil is only very slowly absorbed. Never ever under any circumstances should these be injected I.V.
To repeat what I mentioned earlier; read the directions on the container of any injectable substances and/or any printed information supplied, and follow these directions exactly.
Cheers,
Tom
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