Venous catheterization is a procedure in which a thin, flexible tube is placed into a vein, either to give medicines, fluids, blood or nutrition, to draw samples and measure pressures, or to carry out treatment inside the veins themselves. Its aim is safe, repeatable access to the bloodstream according to the medical need the doctor determines.
The catheter is usually placed under local anesthesia at the entry site, and a light sedative may be added. After disinfecting the skin, the doctor inserts a needle into the vein, often guided by ultrasound, then advances the catheter over a guidewire to the required position. Catheters range from short peripheral ones to central lines and long-term devices under the skin.
The procedure usually takes under an hour, and the patient often goes home the same day unless their condition requires a stay. The site must be kept clean and dry, and the catheter stays for as long as treatment needs it and is then removed on the doctor's decision.
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It allows medicines, fluids, chemotherapy and intravenous nutrition to be given and blood samples to be drawn without repeated needle sticks, and it may be used to measure pressures or to carry out treatment inside a vein. The doctor chooses the type suited to the treatment goal.
People receiving prolonged or repeated intravenous treatment, those whose small veins cannot tolerate repeated punctures, or those whose condition needs monitoring or a procedure inside the veins. The doctor decides after assessment, and a catheter may not suit someone with an active infection at the site or a severe clotting disorder without special evaluation.
Blood tests and a clotting assessment may be requested, and fasting if a sedative will be used. Tell the doctor about your medicines and any allergies, and never stop blood thinners or other medicines on your own, as the doctor decides what to stop and when.
After the skin is disinfected and numbed, the doctor inserts a needle into the vein, often with ultrasound help, then passes the catheter over a guidewire to the right position, secures it and covers it with a sterile dressing. The position may be checked by X-ray.
A catheter does not usually need a long recovery; there may be mild discomfort or a bruise at the entry site, and the patient then returns to light activity. Care of the dressing, hygiene and avoiding pulling on the catheter are needed, following the medical team's instructions.
It can be used almost as soon as it is placed and stays for the planned duration of treatment, which ranges from days to months depending on the type, and is then removed. It may need replacing if it becomes blocked or the site becomes inflamed.
A bruise, bleeding, infection at the site or in the blood, catheter blockage or a vein clot may occur, and rarely a collapsed lung or injury to a nearby vessel with central catheters. Sterile technique, ultrasound guidance and good care reduce these risks.
It usually leaves a very small mark at the entry site, and some long-term catheters have an exit site or a pocket under the skin. Marks generally fade after the catheter is removed.
It depends on the reason for the catheter and its type; a day or a few days may be enough for a short-term catheter without complications, but if it is linked to ongoing treatment, the treating team sets the schedule and timing suitable before travel.
Keep the dressing dry and clean, wash your hands before touching it, and do not pull the catheter or change its position. Contact the medical team promptly if you have fever, redness, swelling, pain, leakage or shortness of breath.
