Where is the arterial blood sampling site?

I believe everyone has gone to the hospital for blood draw. The most common thing is to go to the hospital for a physical examination. A routine blood test is required for a physical examination. At this time, you need to go to the window to draw blood. When going to the hospital for blood draw, you must pay attention to relevant matters, such as going to draw blood in the morning and not eating these things before that. This way, the results of the blood test will be more accurate. At present, the most important thing is arterial blood drawing. Where is the arterial blood drawing generally done?

Arterial blood sampling site:

More common. The results of blood gas analysis are directly affected by many factors before and after blood collection. In order to improve the accuracy of blood gas analysis results, nurses must strictly and correctly operate and provide good care for arterial blood collection. It is also an unshirkable responsibility.

Correctly distinguish arterial blood from venous blood:

Venous blood becomes reduced hemoglobin because oxygenated hemoglobin releases oxygen to tissues. At the same time, tissue metabolic products are recycled into the blood, making the venous blood dark red. In addition, the venous blood pressure is low, and the blood vessel pulsation is not obvious and difficult to touch.

Arterial blood contains more oxygenated hemoglobin, which makes the blood bright red, has high pressure, and the arterial pulsation is more obvious and easy to touch.

Reasonable application of anticoagulants:

Heparin is used as a commonly used anticoagulant, but heparin is acidic. Excessive use will dilute the blood sample, affect the pH value, and cause the PCO2 to be low and the PO2 value to be high. Using too little will not achieve the anticoagulant effect. {The most suitable heparin sodium: concentration 12500U/vial × (2-5) vials, add 100ml saline for use. }

Selection of blood sampling site:

Radial artery, brachial artery, femoral artery, dorsalis pedis artery. (Radial artery and femoral artery are most commonly used)

Blood collection process:

1. Preparation before operation:

Iodine tincture, cotton swabs, curved tray, 1ml or 2ml syringe, rubber stopper, prepared heparin anticoagulant, disposable treatment towel, etc.

2. Patient preparation and puncture method:

Radial artery:

Radial artery

The patient lies supine or semi-recumbent with the wrist straight and slightly abducted, palm facing up, and the hand naturally relaxed on a soft pillow in a hyperextended position. The operator points from the middle and index fingers of the left hand to one horizontal finger (1-2cm) from the wrist crease, 0.5cm from the outside, based on the obvious pulsation point, at the pulsation point of the artery beside the index finger: or use the radial styloid process as the base point, move 1cm to the ulnar side, and then move 0.5vm toward the elbow to obtain the puncture point.

Vertical needle insertion method: Use the index and middle fingers to fix the radial artery on both sides of the longitudinal direction where the radial artery pulsation is most obvious, 1cm apart. Insert the needle vertically 0.5-1cm into the middle of the syringe where the pulsation is most obvious. Fix the needle after seeing the blood return. Remove the needle after the blood is drawn to 0.5-1ml and mark it. Use a sterile cotton swab to apply pressure to stop the bleeding for 5-10 minutes (the needle often causes vasoconstriction after entering the radial artery, and the blood return cannot be seen immediately. It will take a while to see the blood return. Do not rush to advance and withdraw the needle to avoid puncture failure).

Oblique puncture: puncture against arterial blood flow, 30-45°. Use a sterilized finger to feel the radial artery pulse and accurately locate it so that the artery is just below the finger, and insert the needle at the arterial pulse under the index finger.