1, edema patients are often not obvious. According to the anatomical position of the vein, press the local area with your fingers to temporarily disperse the subcutaneous hydrops, and then puncture after the pulse shows.

2. The vein depth of obese patients is not obvious, but the fixation is not slippery. After accurate identification, the needle is inserted at an oblique angle of 30 degrees, and after returning blood, the needle is gently lifted and sent into the blood vessel.

Second, the fragile vein.

The blood vessels of the above-mentioned patients with wasting diseases are fragile, so we should choose to enter the needle from the side of the blood vessels. During puncture, the direction of needle insertion should be parallel to the blood vessel, and the needle insertion should not be too hard. The principle is slow and unhappy, but slow and steady. It must be slow, not fast, fixed and safe.