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The arterial blood gas is useful in acutely unwell patients for assessing acid-base balance and oxygen status. This section outlines the approach for collecting an ABG. Indications for arterial blood gas collection include to assess respiratory and acid base status, as well as for detection of
carboxyhaemoglobin and methaemglobin. Contraindications include patients with coagulopathy, as they are likely to bleed significantly; and inadequate collateral circulation.
Identifying an ArteryWhen looking for an artery, place the index and middle fingers over the desired artery and feel for the area of maximal impulse.
Ask the patient to clench their fist, and apply pressure to both the radial and ulnar arteries. Ask the patient to relax their hand, looking for blanching - if the hand does not blanch then both vessels are not occluded. Release pressure on the ulnar nerve, and look for flushing as the hand is reperfused. If the hand does not flush in 10-15 seconds then the ulnar circulation is inadequate - this is a contraindication to radial puncture on this limb. Specimen Collection
Troubleshooting
Complications
In order to prevent bleeding, place pressure on the insertion site for 3-5 minutes once the needle is removed. Avoid performing an ABG on a patient with a coagulopathy where possible, or consider reversing anticoagulation / withholding it and waiting. If bleeding occurs, compress the site for 3-5 minutes the place a compression bandage over the area. Observe the site, and consider reversing anticoagulation if bleeding is major.
To prevent distal ischaemia, avoid performing an ABG in a limb with peripheral vascular disease and perform Allen's test before inserting the needle.
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Raise your arm above your head and apply pressure with your other hand for 5 minutes or longer. Cover the site with a bandage or put the pressure bandage back on the site, if needed.
What is the procedure of blood withdrawal?Ask the patient to form a fist so the veins are more prominent. Enter the vein swiftly at a 30 degree angle or less, and continue to introduce the needle along the vein at the easiest angle of entry. Once sufficient blood has been collected, release the tourniquet BEFORE withdrawing the needle.
Do you remove the tourniquet after you remove the needle?Remove the tourniquet before removing the needle. Use the major superficial veins. Hold the venous blood collection assembly still while collecting the specimen. Before bandaging, ensure that the puncture to the vein has sealed by observing for hematoma formation after pressure is released.
When drawing blood when should the tourniquet be removed?Never leave the tourniquet on for longer than one (1) minute. To do so may result in either hemoconcentration or a variation in blood test values. These conditions can be avoided by releasing the tourniquet after a preliminary study of the veins has been made.
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