Someti es doctors inject edicines directly in our bloodstream where do they inject it in vein or artery why
Answers
1. Arteries are deep, Veins are superficial so easy to access.
2. Arteries have higher pressures, so puncture site more likely to bleed if pressure not applied till bleeding stops.
3. There is usually only one artery supplying a limb (where it is easier to access) but more than one veins draining the same areas. So you can imagine what will happen if one Artery vs one vein thromboses (clots from inside)
4. Since arteries have higher pressures, you will need active power/pressure assisted injection, and gravity assisted infusors will be useless (like an IV fluid bottle connected via IV line). If you connect a non-pressurized IV fluid to arterial line it will start Flowing back towards the bottle instead of going into the body
5. If you inject a drug in artery, (unless in root of aorta) All the injected drugs (medicines) will go through one specific organ the artery supplies, in high concentration And lot of drugs will be absorbed/filtered in that tissue may be causing local overdose/toxicity.. or blockade of capillaries. some of these drugs (e.g. Thiopentone sodium) may cause severe arterial spasm or precipitate in artery causing blood flow to specific organs to be stop and necrosis (ischemic death) of supplied area.
6. When you inject in vein, the Drug get diluted in continuous flow of the blood towards the heart And further into the heart Chambers by churning action in the heart and then through the pulmonary circulation avoiding excessive high concentration in any particular tissue (execept lungs, which has vast capillary network and high blood flow) Avoid precipitation of drugs or spasms of arteries in any particular organ systems.
These are the Main Reasons why veins are used for regular injections and not arteries