INTRODUCTION —
Central venous access is a commonly performed procedure to insert central venous catheters and facilitate other interventions and device insertions, including the following: pulmonary artery catheters, plasmapheresis catheters, hemodialysis catheters, extracorporeal life support cannulas, inferior vena cava filters, and intracardiac pacing wire and defibrillator leads. The central venous access site and techniques by which access is achieved depend upon the indication for placement, patient vascular anatomy, and other patient-related factors.
The general principles of central venous access, including indications, contraindications, and general issues of preparation and placement, will be reviewed here. The role of catheters and devices for monitoring cardiac parameters or administering chemotherapy or parenteral nutrition are discussed in separate topic reviews.
The general principles of ultrasound-guided placement and placement of jugular, subclavian, and femoral catheters; issues specific to these anatomic sites; routine maintenance and care of catheters and port devices; and complications of central venous catheters and related devices are reviewed in more detail elsewhere.
●(See "Basic principles of ultrasound-guided venous access" and "Placement of jugular venous catheters" and "Placement of subclavian venous catheters" and "Placement of femoral venous catheters".)
●(See "Routine care and maintenance of intravenous devices".)
●(See "Central venous catheters: Overview of complications and prevention in adults".)
CENTRAL VENOUS ACCESS —
A central venous access device is defined as a catheter placed into a thoracic central vein (eg, superior vena cava, brachiocephalic vein, subclavian vein, internal jugular vein) or the iliocaval venous system (eg, inferior vena cava, iliac vein, common femoral vein).
Central venous access is performed at specific anatomic sites via percutaneous puncture to access the vein, often using ultrasound guidance. (See 'Device and site selection' below.)
A wide range of central venous catheters and devices are available and are classified based on clinical category (ie, acute, subacute, chronic), duration of catheter use (ie, dwell time: short-term, mid-term, long-term) (algorithm 1), type of insertion (ie, central, peripheral), location of insertion (ie, jugular, subclavian, femoral, brachial), number of lumens (ie, single, double, triple, quadruple), as well as whether the catheter is implanted or not and to what extent (ie, nontunneled, tunneled [ie, hemodialysis], totally implanted [ie, port]) (figure 1). The basic features of the various types of catheters and the way these features influence catheter selection are discussed separately. (See "Central venous access: Device and site selection in adults", section on 'Types of central venous catheters'.)
Indications — Indications for central venous access include the placement of central venous catheters for the following reasons [1-4]:
●Inadequate peripheral venous access – Inability to obtain appropriate peripheral venous access to meet patient care needs, including vascular access for complex infusion regimens.
●Peripherally incompatible infusions – Short- or long-term intermittent or continuous administration of medications such as vasopressors, hyperosmolar solutions, chemotherapy agents, and parenteral nutrition are typically administered into a central vein, as they can cause vein inflammation (phlebitis) when given through a peripheral intravenous catheter.
●Hemodynamic monitoring – Central venous access permits measurement of central venous pressure, venous oxyhemoglobin saturation (ScvO2), and cardiac parameters (via pulmonary artery catheter).
●Extracorporeal therapies – Large-bore venous access is required to support the high-volume flow required for many extracorporeal therapies, including kidney replacement therapy (ie, hemodialysis, hemofiltration), plasmapheresis, and extracorporeal membrane oxygenation.
Several medical devices also require central venous access for insertion, commonly using an introducer sheath for initial vein access. Examples include:
●Vena cava filters (image 1) (see "Placement of vena cava filters and their complications")
●Venous interventional devices such as venous angioplasty balloon/stents or infusion catheters for venous thrombolytic therapy (see "Endovenous intervention for thoracic central venous obstruction" and "Endovenous intervention for iliocaval venous obstruction")
●Pulmonary artery catheters (figure 2) (see "Pulmonary artery catheters: Insertion technique in adults")
●Pacemakers/defibrillators (figure 3) (see "Temporary cardiac pacing" and "Permanent cardiac pacing: Overview of devices and indications" and "Implantable cardioverter-defibrillators: Overview of indications, components, and functions")
Precautions — Conditions that increase the risk of bleeding or mechanical complications may require special attention to reduce the risk of central venous access. These are reviewed briefly below and in the linked topic reviews. (See 'Device and site selection' below and 'Patients with coagulopathy and/or thrombocytopenia' below.)
GENERAL PREPARATION —
Nontunneled percutaneous central catheters are usually placed at the bedside, while tunneled catheters, catheters with subcutaneous ports (ie, totally implantable central venous devices), and other devices are generally placed in an interventional suite or operating room using fluoroscopic guidance. The equipment for central venous catheterization is outlined in the table (table 1).
Device and site selection — The most appropriate site and approach for central venous cannulation should be individualized based on the clinical situation. Important considerations include operator skill, ultrasound availability, precannulation venous anatomy and patency, patient anatomy (eg, recognizable landmarks, patient tolerance for access positioning, known venous occlusion, presence of lymphedema), risks associated with placement (eg, coagulopathy, pulmonary disease), and access needs (eg, patient needs, duration of catheter use) [5-9]. (See "Central venous access: Device and site selection in adults", section on 'Access site'.)
The anatomic site chosen for central catheter placement also influences the risk for and type of complications, including catheter-associated infection [10]. Complications associated with catheters may be minimized with experienced clinician insertion of catheters, strict sterile technique, proper catheter positioning, and appropriate routine care and monitoring after placement [11]. (See "Central venous catheters: Overview of complications and prevention in adults".)
Specific veins (jugular, subclavian, femoral) and access approaches have inherent advantages and disadvantages. These issues are reviewed separately.
●Jugular venous catheters. (See "Placement of jugular venous catheters", section on 'Specific approaches'.)
●Subclavian venous catheters. (See "Placement of subclavian venous catheters", section on 'Approaches to the subclavian vein'.)
●Femoral venous catheters. (See "Placement of femoral venous catheters", section on 'Femoral vein cannulation'.)
●Peripherally inserted central catheters are typically placed into a superficial vein (basilic vein, cephalic vein) in the upper extremity.
Consent, monitoring and anesthesia — Central venous access is an invasive procedure and informed consent should be obtained unless implied consent or emergency demand is recognized. (See "Informed procedural consent".)
All patients should be monitored during central venous access procedures, including continuous cardiac rhythm and pulse oximetry. Supplemental oxygen should be immediately available, and, for some patients, it may be prudent to administer supplemental oxygen prior to covering the patient with sterile drapes.
Central venous devices are typically placed using local anesthesia. Patients at risk for respiratory compromise with supine or Trendelenburg positioning (ie, acute respiratory illness, obesity) may require a controlled airway to safely place a central venous catheter or device. (See "Considerations for non-operating room anesthesia (NORA)".)
Patients with coagulopathy and/or thrombocytopenia — The risk of bleeding with central venous access is increased in patients with moderate-to-severe coagulopathy and/or thrombocytopenia, although major bleeding is uncommon [12-14]. A 2017 systematic review of central line placement in patients with coagulopathy or thrombocytopenia documented a wide range of bleeding incidence with major bleeding occurring in <1 percent [12]. The correlation between bleeding risk and severity of coagulopathy was weak.
The optimal platelet count, prothrombin time/international normalized ratio, and activated partial thromboplastin time below which central venous catheterization cannot safely be performed is unclear. Thrombocytopenia, especially when coupled with platelet dysfunction, appears to pose a greater risk compared with prolonged clotting times [15,16].
Individuals at increased risk of bleeding who receive central venous access should be closely monitored and managed in an environment with capabilities to respond rapidly with appropriate interventions if bleeding occurs. In general, venous access sites that are easy to monitor for bleeding are preferred. A subclavian approach is often avoided patients with coagulopathy or severe thrombocytopenia, unless an alternative site is not suitable, due to limitations in monitoring and reduced ability to directly compress the venipuncture site. (See "Central venous access: Device and site selection in adults", section on 'Benefits/risk for specific sites'.)
Low platelet count — The risk of bleeding is increased in individuals with platelet counts <50,000/microL, but among these individuals, the correlation between platelet count and bleeding risk is uncertain. Whether to proceed with and the suggested threshold below which prophylactic platelet transfusion should be used varies in available guidelines [17-21]. We suggest an individualized approach to prophylactic platelet transfusion before central venous catheter placement rather than using a specific platelet threshold for all patients. In general, the patient's overall bleeding risk should be assessed, including platelet count, cause of thrombocytopenia, and other comorbidities. We consider preprocedure platelet transfusion for platelet count <20,000/microL, especially if there are comorbidities that increase bleeding risk such as coexistent coagulation abnormalities, fever, and kidney or liver disease [22]. The ability to rapidly respond to bleeding with platelet transfusions is also critical. Considerations when ordering platelets are presented separately. (See "Platelet transfusion: Indications, ordering, and associated risks".)
Our approach is supported by a noninferiority trial that randomly assigned patients with a platelet count of 10,000 to 50,000/microL to receive prophylactic platelet transfusion (one unit) or no platelet transfusion before central venous catheter placement [23]. Three hundred seventy-three central lines were placed in 338 patients. Catheters of any diameter (nontunneled or tunneled) were placed into the internal jugular vein, subclavian vein, or femoral vein according to local practice and using ultrasound guidance by an experienced practitioner. Catheter-related bleeding of grade 2 to 4 was significantly lower in the transfusion compared with no transfusion group (4.8 versus 11.9 percent; relative risk [RR] 2.45, 90% CI 1.27-4.70). Catheter-related major bleeding (grade 3 or 4) requiring intervention or transfusion was not lower in the transfusion group (2.1 versus 4.9 percent; RR 2.43, 95% CI 0.75-7.93). Most patients in the no-transfusion group who had a platelet count of 10,000 to 30,000/microL received platelet transfusion within 24 hours after central venous catheter placement. In subgroup analysis comparing the no-transfusion and transfusion groups, situations recognized as higher risk for catheter-related bleeding included nontunneled catheter insertion (10.6 versus 3.5 percent; RR 3.01, 95% CI 1.20–7.55), subclavian venous access (18.1 versus 3.2 percent; RR 6.19, 95% CI 1.39–27.64), and being in a hematology ward (RR 2.99, (16.5 versus 5.4 percent; 95% CI 1.19–7.54). The highest bleeding risk occurred in hematology patients with a platelet count of 10,000 to 20,000/microL.
Prolonged clotting times — The threshold and interventions for prolonged clotting times depend on the reason for prolongation. Blood products such as plasma should not be routinely used to "correct" an abnormal clotting time, as this exposes the patient to transfusion-associated risks for unclear benefit, especially if a more specific intervention is available [12,22,24]. (See "Clinical use of plasma components", section on 'Settings in which plasma is not appropriate'.)
●Anticoagulants – Therapeutic anticoagulation is withheld prior to central venous access, if possible. Anticoagulation can generally be resumed within hours assuming the absence of bleeding complications. Specific anticoagulation reversal agents are rarely indicated for central venous access procedures as the risk and burden of reversal outweigh the benefits. (See "Perioperative management of patients receiving anticoagulants".)
●Bleeding disorders – Specific clotting factors or other hemostatic agents are rarely indicated but may depend on the severity of coagulopathy. (See "Acute treatment of bleeding and surgery in hemophilia A and B" and "von Willebrand disease (VWD): Treatment of minor bleeding, use of DDAVP, and routine preventive care".)
●Liver disease – (See "Hemostatic abnormalities in patients with liver disease", section on 'Non-surgical invasive procedures'.)
Aseptic technique — To reduce infectious complications, central venous access procedures, including emergency procedures, should be performed in a location that permits the use of aseptic technique.
●Barrier precautions – This includes sterile drapes large enough to cover the entire patient, sterile cover for ultrasound probe, surgical antiseptic hand wash, long-sleeved sterile gown, surgical mask, gloves, and head covering [2,25-29]. Other measures to prevent access site infection should also be used (eg, hair clipping rather than shaving, preprocedure skin antisepsis). (See "Overview of control measures for prevention of surgical site infection in adults", section on 'Infection control'.)
●Skin antisepsis – Preinsertion application of antiseptic solution for skin disinfection at the catheter insertion site reduces catheter colonization and aims to reduce risk of infection. Chlorhexidine gluconate (CHG)-based solutions (>0.5% chlorhexidine preparation with alcohol) are superior to both aqueous and alcohol-based povidone-iodine (PI) solutions [30-36]. In a large trial (2547 catheters), the incidence of catheter-related infection was lower for CHG-alcohol compared with PI (0.28 versus 1.77 per 1000 catheter-days; hazard ratio 0.15, 95% CI 0.05-0.41). If there is a contraindication to CHG, PI, an iodophor, or 70% alcohol can be used as alternatives [37]. CHG antiseptic is typically applied via swab stick and should be applied at the access site and surrounding skin for 30 to 60 seconds. The solution should be allowed to air dry completely prior to draping the patient [32,34].
●No role for systemic antimicrobial prophylaxis – Antimicrobial prophylaxis prior to percutaneous central venous catheter placement is not standard practice. A meta-analysis comparing antibiotics versus no antibiotics for totally implanted venous access devices also showed and overall low rate of infection (1.25 percent) which was similar in both treatment groups [38].
USE OF ULTRASOUND AND EFFICACY AT SPECIFIC SITES
Use of ultrasound — We recommend ultrasound-guided venous access, performed by an experienced provider, whenever possible [39]. (See 'Use of ultrasound and efficacy at specific sites' above.)
Precannulation vein assessment — Before cannulation, routine bedside ultrasound by the provider inserting the device aims to evaluate the vein location, size, and patency and aids in selecting the most appropriate access site target. It is particularly useful in patients who have a history of prior instrumentation or deep vein thrombosis in the region of the proposed access site [40]. (See "Basic principles of ultrasound-guided venous access", section on 'Global use of ultrasound' and "Catheter-related upper extremity venous thrombosis in adults", section on 'Duplex ultrasonography'.)
Preprocedure ultrasound also identifies anatomic variations, which is particularly useful for reducing trauma associated with line placement.
Real-time ultrasound guidance — We recommend the use of real-time ultrasound guidance during central venous cannulation at any site when it is available and practical to use. Ultrasound guidance reduces the number of access attempts and time to cannulation and improves the overall procedure success rate. However, ultrasonographic guidance does not eliminate major mechanical complications including arterial puncture and pneumothorax, which serves as a reminder for vigilance during the entire procedure [41].
The principles of ultrasound and techniques to identify venous structures for venous access are discussed in detail elsewhere. (See "Basic principles of ultrasound-guided venous access".)
When ultrasound is not available, landmark techniques are used to guide access. (See "Placement of jugular venous catheters" and "Placement of subclavian venous catheters" and "Placement of femoral venous catheters".)
Detection of complications — Proper use of ultrasound aims to reduce major complications. Ultrasound also assists with early detection of arterial and venous guidewire malposition and identification of procedure-related pneumothorax [42,43]. An important caveat to studies of ultrasound for this purpose is that accuracy of diagnosis was dependent upon ultrasound operator skill. (See 'Confirming catheter tip position' below and "Bedside pleural ultrasonography: Equipment, technique, and the identification of pleural effusion and pneumothorax".)
Specific sites
Supraclavicular venous access
Internal jugular — Much of the experience in the literature regards the use of ultrasound for internal jugular cannulation [44-46]:
●A systematic review evaluated the overall effectiveness of ultrasound-guided jugular venous catheter placement in 35 trials with 5108 participants [44]. Compared with landmark techniques, ultrasound guidance increased the rate of successful catheter placement by from 91.7 to 97.6 percent (25 trials, relative risk [RR] 1.12, 95% CI 1.08-1.17) and successful first attempt by from 50.1 to 82.2 percent (18 trials; RR 1.57, 95% CI 1.36-1.82) and reduced the time needed for successful cannulation. The total incidence of complications (including arterial puncture) was reduced from 13.5 to 3.4 percent (14 trials RR 0.29, 95% CI 0.17-0.52), and the incidence of inadvertent arterial puncture was reduced from 9.4 to 2.0 percent (RR 0.28, 95% CI 0.18-0.44).
●In an earlier meta-analysis, seven trials including 608 adults undergoing internal jugular cannulation were included [47]. The rate of successful placement was significantly higher for dynamic ultrasound-guided compared with landmark-based techniques (99 versus 78 percent). Failure on the first attempt was significantly reduced from 57 to 33 percent in adults. On average, there were significantly fewer total numbers of attempts in adults (1.5 mean fewer needle passes, respectively). Complications, predominantly arterial puncture, were reduced from 16 to 5 percent.
Other supraclavicular vein options — Ultrasound can guide supraclavicular access to other thoracic veins. The external jugular vein can also be accessed by ultrasound where it is deep, running parallel, posterior, and superior to the subclavian vein. A supraclavicular approach to the subclavian vein has also been described, though it is associated with a higher risk of pleural puncture.
Infraclavicular venous access — When central veins are accessed from an infraclavicular approach, clinical studies have been less consistent in defining the benefit of ultrasound guidance [48,49]. Still, evidence suggests that ultrasound guidance improves the success rate, decreases the risk of puncture-related complications, and decreases the length of time for the procedure compared with "blind" landmark techniques [47,48,50-57].
In a meta-analysis of three trials, direct (ie, dynamic) ultrasound significantly reduced the risk of inadvertent arterial puncture from 5.8 to 0.8 percent (relative risk [RR] 0.21, 95% CI 0.06-0.82) and hematoma formation from 6.6 to 1.2 percent (RR 0.26, 95% CI 0.09-0.76), but not other complications [48,51,53,55]. There were no significant differences in the number of attempts until success, first-time success rates, or time taken to insert the catheter. In a separate meta-analysis of five trials, dynamic ultrasound also significantly reduced inadvertent arterial puncture and hematoma formation, as well as chest complications including hemo/pneumothorax, hemo/pneumomediastinum, thrombosis/embolism (1.3 versus 9.7 percent) [50].
Ultrasound-guided infraclavicular access to the axillary vein is another useful site in critically ill patients, particularly for patients with a tracheostomy [56,58-61]. An ultrasound-guided infraclavicular approach to the cephalic vein has also been used [62]. The advantages of this approach are avoidance of accidental injury to the axillary artery or to the pleura. Such an approach is possible only when the cephalic vein has a caliber appropriate to the diameter of the catheter to be inserted.
Femoral veins — The common femoral vein (CFV) is typically accessed at the groin [48]. Studies of "femoral vein" access typically refer to the CFV, though successful ultrasound cannulation of the femoral vein at mid-thigh has also been described [63,64]. (See "Basic principles of ultrasound-guided venous access", section on 'Ultrasound views' and "Basic principles of ultrasound-guided venous access", section on '"In-plane" versus "out-of-plane" venipuncture'.)
●For femoral vein access, the pooled success rate on the first attempt from three trials was significantly higher for ultrasound compared with landmark techniques (84.1 versus 46.1 percent, RR 1.73, 95% CI 1.34-2.22), and the overall success rate was increased (89.3 versus 78.9 percent, RR 1.11, 95% CI 1.00-1.23) [48]. There were no significant differences in the rate of inadvertent arterial puncture or other complications.
●In a meta-analysis of four trials involving 4065 subjects [65-68], ultrasound-guided femoral vein cannulation for electrophysiologic procedure reduced major vascular complications (1.0 versus 2.0 percent, RR 0.40, 95% CI 0.28-0.91) as well as minor vascular complications (0.42 versus 1.2 percent, RR 0.34, 95% CI 0.15-0.78) [69].
Basilic and brachial veins — Considering the special features of peripherally inserted central catheters (PICCs), ultrasound is required for choosing the best site (ie, preprocedural scan) and for "tip navigation" (ie, control of the proper direction of the catheter into the brachiocephalic vein using supraclavicular ultrasound). Ultrasound guidance helps avoid puncture-related complications (eg, avoiding the brachial artery and median nerve) [70,71]. Ultrasound guidance has also improved the overall clinical performance of PICCs. When PICCs were first introduced, they were typically inserted by puncture and cannulation of the visible/palpable veins of the antecubital fossa, a practice now abandoned. Simply by moving the access site from the superficial veins of the antecubital area to the deeper veins in the middle third of the upper arm, ultrasound guidance has been associated with a 95 to 99 percent rate of successful cannulation and a substantial decrease in early and late complications.
GENERAL ASPECTS OF PLACEMENT —
Venous access for the placement of central venous devices follows a series of standard steps that adhere to common safety principles. This step-wise approach is outlined in the table for acute and emergency venous access (eg, nontunneled catheters, venous sheaths) (table 2); placement of other central venous devices follows a similar approach.
The Seldinger guidewire method is the preferred approach [72]. This method gains access to a central vein via an introducer needle through which a matched guidewire is threaded to maintain venous access after needle withdrawal. The catheter is advanced into position over the intravascular guidewire, which is subsequently removed from the catheter.
Specific details of central venous catheter placement at various anatomic locations (jugular, subclavian, femoral) and other devices are presented separately. (See "Placement of jugular venous catheters" and "Placement of subclavian venous catheters" and "Placement of femoral venous catheters".)
Acute or emergency access — Acute or emergency central venous access includes the placement of nontunneled central venous catheters, which may be needed for a variety of reasons (eg, fluid therapy, hemodialysis, plasmapheresis). Details of acute or emergency central venous access are provided separately (table 2). (See "Central venous access: acute and emergency access in adults".)
In the acute setting, a venous sheath can be used for large-volume intravenous infusion or for the insertion of a pulmonary artery catheter. (See 'Venous sheath' below and "Pulmonary artery catheters: Insertion technique in adults".)
Other venous devices — The basic principles for placing other central venous devices starts with the general steps outlined in the table for acute or emergency central venous access (table 2). Other aspects of placement are described below for each device.
Venous sheath — A venous (introducer) sheathis a combined tissue dilator and sheath assembly that is sized according to the intended device. Venous sheaths are commonly used to introduce a variety of venous devices including some tunneled catheters (which may use a peel-away sheath), pulmonary artery catheters, pacing leads, inferior vena cava filters, intravascular ultrasound, and venous interventional devices, including venous angioplasty balloons and stents.
The venous sheath is typically placed using the Seldinger guidewire technique. After the guidewire is in place, the tissue dilator and sheath are advanced over the guidewire together. The tissue dilator and guidewire are then removed, leaving the sheath in place, through which other venous devices can be inserted. The attached side port is then aspirated and irrigated to check function, and the sheath is secured to the skin at its exit site.
Tunneled catheters — Venous access for tunneled catheters is obtained in a manner like nontunneled catheters. The exit site of the catheter on the skin is chosen, which determines the length of catheter that will be needed for proper catheter tip positioning. For some tunneled catheters, the excess length of catheter provided is trimmed before the catheter is tunneled; for others, it can be trimmed afterward. Other types of catheters come in fixed lengths (eg, dialysis catheters), and the position of the exit site is chosen to accommodate the predetermined length of the catheter. For subclavian and jugular tunneled catheters, the exit site on the chest wall should be located below the mid-clavicle in a position that does not interfere with clothing or upper extremity mobility.
Percutaneous access is performed as outlined in the table (table 2). Once the guidewire is in position, the skin at the guidewire exit site is incised to accommodate at least the diameter of the catheter. Following administration of local anesthesia to the catheter exit site and planned subcutaneous tunnel, an incision is made at the planned catheter exit site. A tunneling device is usually included in the catheter kit and is attached to the distal catheter lumen orifice (ie, catheter tip lumen hole rather than a more proximal port). The catheter is advanced subcutaneously from the catheter exit site to the guidewire exit site (antegrade), and the tunneler is removed. Some catheters will need to be tunneled retrograde. Care is taken to ensure that the tunnel provides a gentle curve in the catheter from the catheter exit site to the guidewire site. Acute angulation may lead to poor flow rates and catheter malfunction. After dilating the vein, the tissue dilator/sheath combination is placed over the wire using fluoroscopic guidance. The tissue dilator is removed, and the catheter is advanced through the sheath and the sheath peeled away. The position of the tip of the catheter is checked and adjusted, as needed. The cuff of the tunneled catheter is ideally located 2 cm from the skin exit site of the catheter. The catheter is sutured to the skin to prevent malposition until the cuff is incorporated in the subcutaneous tissue.
Subcutaneous ports — Percutaneous venous access is obtained as outlined in the table (table 2). Once the guidewire is in place, local anesthetic is administered into the skin and subcutaneous tissue in the region of the planned pocket. An incision is made through the skin and, using electrocautery, the pocket is created to accommodate the device by undermining the subcutaneous tissue to the level of the fascia. Prior to placing the port, its function should be checked by inserting a needle and irrigating with saline, which should flow freely through the port hub. The device is placed into the pocket, and the size of the pocket and orientation of the device is adjusted as needed.
Once the pocket is completed, the catheter is tunneled from the pocket to the guidewire exit site, if needed (eg, jugular venous access). Care is taken to avoid catheter angulation, which will lead to mechanical dysfunction. After dilating the vein, the tissue dilator/sheath combination is placed over the wire. The tissue dilator is removed, the catheter is placed through the sheath, and the sheath is peeled away. The catheter is positioned and adjusted as needed. The excess catheter is trimmed and attached to the hub of the port device, which is placed into the pocket and sutured into place. Placing sutures at three points of fixation into fascial tissue is important to prevent port rotation, which can transpose the access hub away from the skin surface, making access difficult. The subcutaneous tissues and skin are sutured closed. Prior to dressing the wound, the port should be accessed through the skin, and the port aspirated and irrigated to confirm its proper functioning. Ports are typically loaded with heparinized saline according to the manufacturer's recommendation if they are not accessed for immediate use.
Confirming catheter tip position — Catheter tip positioning can be confirmed with one or more of the following methods: chest radiography, fluoroscopy, ultrasound, transesophageal echocardiography (typically intraoperative), and intracavitary electrocardiography (IC-ECG) [43,73-81]. Chest radiography and fluoroscopy are the most used methods in the United States.
Radiography — In nonemergency situations, a postprocedure chest radiograph is recommended to confirm catheter course and tip position prior to use of jugular and subclavian catheters. Femoral catheters do not require radiologic confirmation of position. The need for routine radiography confirmation following an apparently uncomplicated right internal jugular catheter placement has been questioned and is no longer considered routine [75,77,78].
Ultrasound and echocardiography — Alternative imaging modalities to radiography to localize intraprocedure guidewire position and ultimate catheter tip position include ultrasound and transesophageal echocardiography, which are particularly useful in critical care settings and in the operating room. Real-time transthoracic ultrasound can also be used to assess for proper positioning of the guidewire tip prior to catheter insertion and pneumothorax [42,82-84]. A meta-analysis that pooled 20 studies showed sensitivity of 88 percent and specificity of 99 percent for ultrasound detection of pneumothorax, compared with 52 and 100 percent for chest radiography [83,85]. (See "Clinical presentation and diagnosis of pneumothorax", section on 'Pleural ultrasonography'.)
Intracavitary electrocardiography — IC-ECG is another technique that relies on detection of intracardiac P wave patterns obtained during catheter positioning. The rationale for this approach is that the sinoatrial node is located at the junction of the right atrium and superior vena cava (cavoatrial junction). Thus, mapping the catheter tip to the sinoatrial node internally identifies the biologically correct catheter tip position. Following catheter insertion, an electromagnetic guidewire is threaded through an introducer needle and connected to an electrocardiograph monitor lead. On the IC-ECG tracing:
●A normally shaped P wave identifies the mid-to-upper superior vena cava.
●The widest P wave indicates the central catheter tip is at the superior vena cava-right atrium junction.
●A biphasic P wave identifies the location of the right atrium.
●Superimposition of the intracavitary ECG with a surface ECG at the point of maximal P wave deflection indicates appropriate positioning of the catheter tip.
Several reviews in hemodialysis populations have confirmed the utility of this technique [86-89]. In the largest review of over 1000 cases, the technique was successfully applied in 98 percent. The presence of preexisting cardiac arrhythmias that affect P wave generation and propagation (eg, atrial flutter and fibrillation) constitutes a main technique limitation, and in these cases, IC-ECG may not be helpful [89]. A meta-analysis and large registry review have found improved tip positioning for IC-ECG compared with plain radiography for placement of peripherally inserted central catheters [90,91].
Optimal catheter tip positioning — The optimal positioning of the catheter tip depends on the specific access site. In general, catheters function well with the tip situated in any major vein. However, suboptimal tip position may be related to delayed complications. As an example, catheter tip position within the subclavian vein is associated with thrombosis. If a catheter is malpositioned within the venous system, it may be used under emergency circumstances but should be repositioned when feasible. By contrast, inadvertent placement of a catheter into the arterial system mandates immediate attention [92]. (See "Vascular complications of central venous access and their management in adults".)
Common access sites, catheter tip positioning, and management of malpositioned catheters are reviewed separately.
●(See "Placement of jugular venous catheters", section on 'Confirmation of jugular catheter position'.)
●(See "Placement of femoral venous catheters", section on 'Confirmation of femoral catheter position'.)
SOCIETY GUIDELINE LINKS —
Links to society and government-sponsored guidelines from selected countries and regions around the world are provided separately. (See "Society guideline links: Venous access".)
INFORMATION FOR PATIENTS —
UpToDate offers two types of patient education materials, "The Basics" and "Beyond the Basics." The Basics patient education pieces are written in plain language, at the 5th to 6th grade reading level, and they answer the four or five key questions a patient might have about a given condition. These articles are best for patients who want a general overview and who prefer short, easy-to-read materials. Beyond the Basics patient education pieces are longer, more sophisticated, and more detailed. These articles are written at the 10th to 12th grade reading level and are best for patients who want in-depth information and are comfortable with some medical jargon.
Here are the patient education articles that are relevant to this topic. We encourage you to print or email these topics to your patients. (You can also locate patient education articles on a variety of subjects by searching on "patient info" and the keyword(s) of interest.)
●Basics topic (see "Patient education: Central line infection (The Basics)")
SUMMARY AND RECOMMENDATIONS
●Indications for central venous access – Common indications for central venous access include inadequate intravenous access, medication and fluid administration, hemodynamic monitoring, and extracorporeal therapy (eg, hemodialysis, plasmapheresis). Central venous access is also used to facilitate insertion of venous devices, including pulmonary artery catheters, pacemakers/defibrillators, inferior vena cava filters, and to perform venous intervention. (See 'Indications' above.)
●Catheter type and site selection – Central venous catheters can be inserted through the jugular, subclavian, or femoral veins, or peripherally inserted via upper arm peripheral veins. The type of catheter used is based on the clinical scenario of the individual patient, anticipated duration of use, and provider preference. The optimal site is determined by patient anatomy, clinical circumstances, and operator experience. (See 'Device and site selection' above and "Central venous access: Device and site selection in adults", section on 'Access site'.)
●Use of ultrasound
•Precannulation ultrasound – Preprocedure ultrasound by the proceduralist inserting the access aims to evaluate venous anatomy and patency and aid in selecting the most appropriate site of access. (See 'Use of ultrasound' above.)
•Intraprocedure ultrasound – For all adults undergoing central venous access (any site), we recommend ultrasound guidance during venous cannulation, when practical (Grade 1B). The use of ultrasound reduces the risk of complications and shortens the time to successful cannulation. Ultrasound guidance is particularly useful in high-risk patients, such as those with coagulopathy. Important steps during real-time ultrasound guidance include needle guidance for target vessel puncture, guidewire position confirmation at the entry site, and guidewire tip recognition to reduce catheter malposition. If ultrasound is not available or not practical to use (eg, emergency access), landmark techniques are used to guide central venous access. (See 'Use of ultrasound' above.)
•Post-cannulation ultrasound – Intra- or postprocedure ultrasound can assist with early confirmation of guidewire and catheter tip position and identify procedure-related pneumothorax. (See 'Ultrasound and echocardiography' above.)
●Patients with increased bleeding risk – Individuals with thrombocytopenia and/or prolonged clotting time should have careful site selection, avoiding the subclavian vein approach, when possible. Acute catheter needs should be considered in the context of interventions to reduce bleeding risk. Preprocedure platelet transfusion for platelet count <20,000/microL should be considered, but other comorbidities factor into the decision to transfuse platelets, and clinical judgment is required. Coagulation abnormalities should be addressed based on the underlying cause and severity of coagulopathy. Routine preprocedure transfusion of plasma for coagulopathy is avoided. (See 'Patients with coagulopathy and/or thrombocytopenia' above.)
●Aseptic technique – To reduce infectious complications, all central venous access procedures, including emergency procedures, should be performed using an aseptic technique, which includes full barrier precautions and skin antisepsis. We suggest the use of chlorhexidine gluconate (CHG)-based solutions (>0.5% chlorhexidine preparation with alcohol), rather than a povidone-iodine solution (Grade 2B). If a CHG-based solution is not available, alternative agents can be used (eg, povidone-iodine, an iodophor, or 70% alcohol). (See 'Aseptic technique' above.)
●General access techniques – Central venous catheterization is performed through a series of well-defined steps as outlined in the table (table 2). Central venous access for venous sheaths and other venous devices is performed in a similar manner. (See 'General aspects of placement' above.)
●Confirming catheter tip positioning – Catheter tip positioning can be confirmed with one or more of the following methods: chest radiography, fluoroscopy, ultrasound, transesophageal echocardiography (typically intraoperative), and intracavitary electrocardiography (IC-ECG). To detect catheter malposition and pneumothorax, chest radiography is typically used, but periprocedural ultrasound or IC-ECG are alternative techniques. (See 'Confirming catheter tip position' above.)
•Chest radiography is often used to confirm jugular and subclavian catheter placement prior to use in nonemergency situations. (See "Placement of subclavian venous catheters", section on 'Confirmation of subclavian catheter position'.)
•Femoral catheters do not require radiologic confirmation of position. (See "Placement of femoral venous catheters", section on 'Confirmation of femoral catheter position'.)