PICC tube is a catheter that is punctured through a vein in the peripheral arm and left in the superior vena cava. Its use helps prevent the effects of certain special drugs on the arm vessels and reduces the inconvenience caused by repeated punctures. The use of PICC tube maintenance and precautions are as follows: 1. catheter maintenance 1. flushing: patients using PICC tubes should go to the hospital every week for flushing maintenance treatment to prevent blockage of the tube; 2. drug change: the first 24 hours of placement of PICC tubes must be changed, which can be gradually changed to once a week according to the degree of wound healing, while replacing the heparin cap to help prevent infection; 3. observation. Regularly observe the fixed position of the catheter and the flow of the catheter, whether the patient has allergy to the dressing, etc. Precautions 1. Avoid wetting: Since the PICC tube is left on the arm, a shower should be used when bathing to avoid the catheter being wet as much as possible to help prolong its service life; 2. Avoid strenuous exercise: Try not to lift heavy objects and do heavy work on the arm where the catheter is placed to avoid strenuous exercise leading to catheter dislodgement and displacement; 3. Maintain hygiene: Usually keep the patch at dry and hygienic, if it is found If you find that the film of the fixed catheter has fallen off, go to the hospital and let the doctor replace it in time; 4. Avoid medical operations: It is forbidden to use the arm on the side of the indwelling PICC tube to measure blood pressure, which will lead to the offset of the catheter position and inaccurate blood pressure measurement; in addition, try to avoid taking blood tests through the catheter, which may lead to an increased chance of infection. In addition, usually pay attention to the maintenance of the catheter to help extend the service life, do not handle the situation without authorization, such as redness and swelling around the catheter, oozing, etc., promptly seek medical advice.