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REVIEW Central Venous Catheterization—An Anatomical Review of a Clinical Skill, Part 2: Internal Jugular Vein via the Supraclavicular Approach J.M. BOON,1{ A.N. VAN SCHOOR,1* P.H. ABRAHAMS,1,2,3 J.H. MEIRING,1 AND T. WELCH4 1Department of Anatomy, University of Pretoria, Pretoria, South Africa 2Girton College, Cambridge, United Kingdom 3Institute of Clinical Education, Warwick Medical School, Coventry, United Kingdom 4Queen’s College, Cambridge, United Kingdom The safe and successful performance of a central venous catheterization (CVC) requires a specific knowledge of anatomy in addition to a working knowledge. Misunderstanding the anatomy may result in failure or complications. This review aims to aid understanding of the anatomical framework, pitfalls, and complications of CVC of the internal jugular veins. CVC is common practice amongst surgeons, anesthesiologists, and emergency room physicians during the preparations for major surgical procedures such as open-heart surgery, as well as for intensive care monitoring and rapid restoration of blood volume. Associated with this technique are certain anatomical pitfalls and complications that can be successfully avoided if one possesses a thorough knowledge of the contraindications, regional anatomy, and rationale of the technique. Clin. Anat. 21:15–22, 2008. VVC 2007Wiley-Liss, Inc. Key words: clinical procedures; central venous catheterization; anatomy; pit- falls; complications; internal jugular vein INTRODUCTION Central venous catheterization (CVC) is a common practice amongst surgeons, anesthesiologists, and emergency room physicians, during the preparations for major surgical procedures (Chudhari et al., 1998). CVC can serve as a means for parenteral nutrition, administration of drugs and fluids, and allowing for invasive monitoring of cardiac parame- ters (Luckraz, 2003). However, serious complications can occur when the clinician lacks a sound understanding of the anatomy that plays a vital role in the safe and successful performance of CVC (Abrahams and Webb, 1975; McMinn et al., 1984; Beahrs et al., 1986; Crisp, 1989; Ger, 1996; American Association of Clinical Anatomists (AACA, EAC), 1999; Cottam, 1999; Boon et al., 2001). A lack of anatomical knowledge can also prolong a procedure, which will inevitably lead to increased morbidity and mortality (Beahrs et al., 1986; Graney, 1996). Competency to perform clinical procedures such as CVC only exists when a practitioner has sufficient knowledge and manual skills required to perform the procedure safely and successfully. Therefore, an important part of competency is a sufficient and updated knowledge base, which is necessary to perform a safe and successful proce- dure. Recognition of the relevant anatomy to any specific procedure remains the important basis of {Deceased. *Correspondence to: A. van Schoor, Department of Anatomy, Section of Clinical Anatomy, School of Medicine, Faculty of Health Sciences, University of Pretoria, Pretoria 0001, South Africa. E-mail: albert.vanschoor@med.up.ac.za Received 4 November 2005; Revised 20 July 2007; Accepted 7 October 2007 Published online 3 December 2007 in Wiley InterScience (www. interscience.wiley.com). DOI 10.1002/ca.20563 VVC 2007 Wiley-Liss, Inc. Clinical Anatomy 21:15–22 (2008) this knowledge. Phillips (1987) points to the impor- tance of identifying those features of anatomical relationships that are of special interest to clinicians performing CVC. This article reviews the clinical anatomy of CVC of the internal jugular vein (IJV). It starts with a step- by-step description of the different procedures and then focuses on the anatomical pitfalls and complica- tions. STEP-BY-STEP PROCEDURE 1. Place the patient in a supine position, at least 158 head down (Trendelenburg’s position), to distend the veins in the neck and prevent the possible occurrence of an air embolism. Only if the cervical spine has been cleared radiograph- ically can the patient’s head be turned away from the puncture site (Shimada and Sato, 1997). 2. Sterile preparation of the skin and drape the area. Sterile gloves should be worn during the procedure. 3. Use a local anesthetic if the patient is awake. This is not necessary if the patient is under general anesthesia. 4. Locate the carotid artery by palpation in the space between the trachea and sternocleido- mastoid (SCM). Thereafter do not palpate the carotid pulse again (Bazaral and Harlan, 1981). The vein is located immediately lateral to the carotid pulse (Ellis and Feldman, 1997). Anterior Approach (see Fig. 1) 5. Introduce a large caliber needle attached to a syringe into the center of the triangle formed by the sternal and clavicular heads of SCM and the clavicle (Sedillot’s triangle). 6. Direct the needle inferiorly, parallel to the sag- ittal plane, 30–458 posterior to the frontal plane. The needle should be advanced inferi- orly and slightly laterally toward the anterior end of the first rib behind the clavicle. 7. Slowly advance the needle while gently with- drawing the plunger of the syringe. 8. When free flow of blood appears, remove the syringe and occlude the needle with a finger to prevent air embolism. Posterior Approach (Paschall and Mandel, 1983) (see Fig. 2) 5. Find a point one-third of the distance along the line between the sternal head of the clavicle and the mastoid process, just lateral to SCM (Paschall and Mandel, 1983). At this point, the external jugular vein (which should not be used because of its valves) crosses over SCM. 6. Introduce the needle and cannula at an angle of 30–408 to the skin, deep to SCM and advance inferiorly and medially toward the suprasternal notch until entering the IJV at a depth of 2–3 cm (Abrahams and Webb, 1975). 7. The needle is hence advanced through skin, superficial fascia, platysma, and deep cervical fascia. 8. Insert the guidewire and remove the needle. Then insert the catheter over the guidewire. Anterior and Posterior Approaches 9. Remove the guidewire and connect the cathe- ter to the intravenous line. 10. Fix the catheter in place. 11. Attach the central venous pressure setup to the intravenous tubing and adjust the manom- eter to level zero with the level of the patient’s right atrium. 12. Obtain a chest X-ray to identify the position of the tip of the catheter and a possible pneumo- thorax. 13. Obtain free flow intravenous fluid with gravity and flow of blood through the catheter tubing on lowering the intravenous fluid bag below the level of the patient. Direction of the Needle The needle is inserted at the apex of the triangle formed by the sternal and clavicular heads of SCM. The apex is situated *5.0 cm superior to the clavi- cle. The vein lies at a depth of 1.0–1.5 cm below the skin between SCM and the cervical pleura. The nee- dle should be directed in a caudal direction at an angle of 30–458 to the frontal plane, keeping the needle parallel to the sagittal plane. This ensures that the needle is directed along the central axis of the vein (AACA, EAC, 1999). Bazaral and Harlan (1981) suggests a needle insertion at or above the cricoid cartilage. The needle should be inserted at a 30–408 angle to the skin, expecting the IJV 1.0–2.0 cm inferior to the cricoid cartilage ring at a depth of 1.0–1.5 cm. The head should not be extremely rotated, which may cause SCM to overlie the vein. Correct Placement of Catheter Tip The catheter tip should be placed 3.0–4.0 cm above the junction of the superior vena cava and the right atrium (Blitt, 1985). Equipment Selection and Ultrasound Guidance The choice of equipment depends greatly on what the clinician is trying to accomplish, what equipment is available to him, or what equipment he feels most comfortable using. It should be noted that in a study conducted by Onders et al. (2006), they found that more difficulty was associated with the insertion of a larger triple- lumen catheter when compared with the smaller single lumen catheter (31% vs. 11%, respectively; P <0.009). Although Lakhal et al. (2006) concluded that central venous pressure (CVP) measurement made at the distal ports of a multi-lumen catheter 16 Boon et al. Fig. 1. Surface anatomy of the neck indicating the procedure for inserting a CVC into the IJV via the anterior approach. The circle indi- cates location for needle insertion and the arrow represents the direc- tion in which the needle should be inserted. (1) Sternal head of SCM, (2) clavicular head of SCM, (3) manubium, (4) right brachiocephalic vein, (5) right subclavian vein, (6) right IJV, (7) sternal notch, and (8) clavicle. Fig. 2. Surface anatomy of the neck indicating the procedure for inserting a CVC into the IJV via the posterior approach. The dotted line indicates a line between the sternal head of the clavicle and the mastoid process. The circle indicates location for needle insertion and the arrow represents the direction in which the needle should be inserted. (1) Sternal head of SCM, (2) clavicular head of SCM, (3) manubium, (4) right brachiocephalic vein, (5) right subclavian vein, (6) right IJV, (7) sternal notch, and (8) clavicle. 17Internal Jugular Vein Catheterization are not influenced by high flows through the proxi- mal ports. The advantage of inserting a multi-lumen catheter is that it is therefore not necessary to discontinue the fluid infusion during a CVP measurement. Ultrasound guidance is useful in helping to locate the subclavian vein (SCV) for CVC and it decreases the complications that may occur (i.e., pneumo- thorax and arterial puncture). However, it does not decrease the technical difficulties that may occur (Hind et al., 2003). According to both Bold et al. (1998) and Lefrant et al. (1998), ultrasound guid- ance does not have a significant effect on improving the success rate of CVC during clinical trials and that the anatomical landmark-based technique remains reliable. PATIENT POSITION The patient should be positioned in the Trendelen- burg position. This facilitates filling of the vein and decreases the risk of air embolism (Mathers et al., 1992). Brederlau et al. (2004) conducted a study on 64 ventilated ICU patients (14 female, 50 male) with a median age of 52 years (range, 18–85 years), need- ing central venous cannulation for insertion of a central venous catheter, haemodialysis, or pulmo- nary artery catheter. The majority of patients pre- sented with risk factors for a difficult cannulation and catheterization was performed using real-time ultra- sound guidance with all patients positioned in 308 dorsal elevation. Despite a high incidence of anoma- lous anatomy (39%) no injury to the carotid artery occurred and all attempts were successful. The authors concluded that ultrasound-guided cannula- tion of the IJV can be performed successfully with the patient positioned in 308 dorsal elevation. Poten- tially deleterious position changes can thus be avoided in high-risk patients. Turning of the Head Turning the head should only be done if a possible neck injury has been excluded. Although anatomical studies have not confirmed the benefit of turning the head away from the site of catheter insertion (Jesseph et al., 1987), it may decrease the risk of contamination and patient anxiety during the proce- dure (Dronen and Younger, 1994). Jesseph et al. (1987) stated that by turning the head the acuteness of the angle of the SCV and IJV is increased. They suggest a position of lying supine with the head and shoulders in a neutral position. This is a favorable position considering the fact that many patients needing a central venous catheter in the emergency department have suspected neck injuries where manipulation of the head is totally contraindicated. The angle of the SCV with the IJV is more or less 908 (Jesseph et al., 1987), and increases when the head is turned to one side. This suggests that turn- ing the head away from the side of the puncture may in fact promote malpositioning in the IJV. Turning the head toward the site where the procedure is per- formed may prevent the advancing catheter from moving into the IJV. ANATOMICAL PITFALLS The following anatomical pitfalls, associated with inserting a CVC via the IJV, is essentially the same to that of inserting a CVC via the SCV (see Part 1: Subclavian vein, Clin Anat 20:602–611): Superior vena cava, phrenic nerve, vagus nerve, thoracic duct, right lymphatic duct, apex of the lung, and the cervical pleura. Internal Jugular Vein The IJV is most frequently used for CVC (Mathers et al., 1992). It lies in a straight line connecting the mastoid process and the medial end of the clavicle and is more distensible than the SCV. This is shown by narrowing of the diameter of the vein with pro- longed palpation of the carotid pulse (Armstrong et al., 1994). The diameter of the internal jugular ves- sel is greatest below the cricoid cartilage, where it may reach 2.0–2.5 cm (Bazaral and Harlan, 1981). The transverse process of the atlas, the cervical plexus in the upper neck, and the anterior and mid- dle scalene lie posterior to the IJV. More inferiorly the phrenic nerve, thyrocervical trunk, and first part of the subclavian artery are found posterior to the IJV. The common carotid artery and vagus nerve are found medial to the IJV (Bazaral and Harlan, 1981). As the vein approaches the supraclavicular junction with the SCV, it takes a more medial position in the triangle between the two heads of SCM. A head-down tilt of 158 (Trendelenburg position) causes significant distension of the vein. Both exten- sive palpation of the neck and rotation of the head increase the difficulty to cannulate the vein. Exten- sive palpation of the carotid artery may distort the anatomy. Therefore, Bazaral and Harlan (1981) rec- ommend that after locating the artery, palpation should be discontinued. The IJV is more collapsible compared to the SCV (AACA, EAC, 1999). This may complicate catheteri- zation. The advancing needle may press the anterior wall of the vein against the posterior wall. This may result in passing the needle through both walls with- out locating the lumen. If no blood is found after advancing the needle at a depth of 2.0–2.5 cm, the needle should be withdrawn and therefore reestab- lishing a lumen by drawing the anterior wall from the posterior wall. The right IJV is preferred because of its straight course into the superior vena cava and right atrium, which facilitates successful and correct placement of the catheter (Mathers et al., 1992). An anatomical study conducted by Botha et al. (2006) showed that the IJV lies directly posterior to the apex of the triangle, formed when the sternal and clavicular heads of SCM merge (Sedilott’s trian- gle), in 78.79% of the cases on the left and 97.14% of the cases on the right. 18 Boon et al. External Jugular Vein The external jugular vein crosses over SCM at a point one third of the distance along the line between the sternal head of the clavicle and the mastoid pro- cess. It is separated from the sternomastoid by the cervical fascia and often has one or more sets of valves in its course through the neck (Abrahams and Webb, 1975; Cobb et al, 1987; Mathers et al., 1992). Common Carotid Artery The common carotid artery usually lies medial to the IJV (Edwards and Morgan, 1989). In a study conducted by Denys and Uretsky (1991), they found that in about 92% of cases (n ¼ 200 patients) the IJV was antero-lateral to the common carotid artery. In 1% the IJV was more than 1.0 cm lateral from the common carotid artery. The IJV can lie antero-medi- ally to the common carotid artery in about 2% and in 5% of cases the IJV lies totally out of the path that was predicted by the external surface landmarks. ANATOMICALLY RELEVANT COMPLICATIONS The following anatomically relevant complications, associated with inserting a CVC via the IJV, is essen- tially the same to that of inserting a CVC via the SCV (see Part 1: Suclavian vein, Clin Anat 20:602–611): Venous air embolism, cardiac tamponade, dysrhyth- mias,pneumothorax, hydrothorax, thrombosis, cath- eter related infection, and catheter embolization. Arterial Puncture With CVC of the IJV, arterial puncture usually involves the common carotid artery, because of its close anatomical relationship to the IJV (Caridi et al., 1998; Chudhari et al., 1998; Denys and Uretsky, 1991). Yeum et al. (2001) retrospectively analyzed the data on 150 IJV catheterization attempts on 132 patients. Arterial puncture of the common carotid artery occurred in 11.3% of cases. The direct result of puncturing either the subcla- vian artery or the common carotid artery is the for- mation of a hematoma (Chudhari et al., 1998). Mild to severe thrombosis may also occur, especially in long-term catheterization (Chudhari et al., 1998; Iovino et al., 2001; Schummer et al., 2003), result- ing in the possible compression of the surrounding structures. Arterial pseudo-aneurysms have also been reported to occur after puncturing the common carotid artery or the thyrocervical trunk (Luckraz, 2003). Wisheart et al. (1972) reported a case of lacera- tion of the ascending cervical artery, with massive hemothorax, after inserting a catheter via the IJV. Schummer et al. (2005) recently reported a case where intra-arterial misplacement was confirmed using a pressure transducer, after attempting an IJV catheterization. Surgical exploration of the neck showed that the carotid artery remained uninjured; however, the introducer sheath had completely punctured the right IJV and entered the inferior thy- roid artery. Puncturing the pulmonary artery has also been documented in the literature (Rosen and Latto, 1992). One study reported the puncturing of the ascending aorta (Childs and Wilkes, 1986), within the pericardial reflection causing a fatal hemoperi- cardium. The patient reported by Childs and Wilkes (1986) had gross abdominal distension, causing superior movement of the intrathoracic structures and therefore changes in the classical anatomical landmarks. Failure to Locate the IJV Locating the IJV becomes more difficult after com- mon carotid arterial puncture because of venous compression from hematoma formation due to arte- rial leakage. (Armstrong et al., 1994). The anterior wall of the vein may also, due to the collapsible nature of the vein, be pushed against the posterior wall by the needle. The needle may there- fore puncture both walls without reaching the lumen. Withdrawal of the needle at this point may draw the anterior wall away from the posterior wall and with aspiration the lumen of the vein may so be encoun- tered (AACA, EAC, 1999). According to Chudhari et al. (1998), venous pseudo-aneurysms are a com- mon occurrence when multiple attempts at punctur- ing the IJV have been attempted. Hemothorax The development of a hemothorax is similar to complications discussed in Part 1: Subclavian vein in Clin Anat 2007;20. Lovell and Baines (2000) reported a fatal case of hemothorax in a child, following the attempted placement of a cannula in the left IJV. Extravasation of blood products via the cannula resulted in haemo- thorax, hypotension, and eventual brain death. Brachial Plexus Injury Injury of the brachial plexus may occur when the correct technique is not followed and the needle is not directed correctly. The brachial plexus lies poste- rior to the subclavian artery posterior to anterior scalene and both cross the first rib only 2.0 cm lat- eral to the SCV (Smith et al., 1965). Therefore, brachial plexus injuries are more common with the catheterization of the SCV and is usually associated with a subclavian artery puncture. Paschall and Mandel (1983), however, comments on upper root brachial plexus injury after IJV cannu- lation. The patient complained of sensory loss over C5/C6 distribution and loss of motor function of the muscles around the shoulder joint. The upper trunk of the brachial plexus (C5, C6) lies at the level of the cricoid cartilage, close to the puncture site of the IJV. The upper trunk lies in the posterior triangle of the neck and the IJV in the anterior triangle. There- fore, when using the posterior access route to the vein at the junction of the middle and lower thirds of 19Internal Jugular Vein Catheterization SCM, aiming at the suprasternal notch, the upper trunk of the plexus may be injured if the needle is slightly posterior when entering the posterior triangle (Paschall and Mandel, 1983). Although this complication is rare for CVC of the IJV, several cases of brachial plexus injury have been reported recently (Tarng et al., 1998; Del Rosario Usoles et al., 2004; Tajiri et al., 2004) and one should be aware of the possibility of injury to the upper trunk of the brachial plexus when using the posterior approach to the IJV. Phrenic Nerve Injury Vascular lesions due to IJV puncture may result in the formation of a hematoma, which is usually clini- cally evident. Although mostly benign, some of these hematomas may cause compression of the surround- ing structures, i.e. the phrenic nerve (Depierraz et al., 1989). Damage to the phrenic nerve is also possible when placing an IJV catheter, because of the close relationship between the IJV and the phrenic nerve behind SCM. As opposed to compression of the phre- nic nerve by a hematoma, or transient blockade fol- lowing local anaesthetic infiltration, direct injury may be irreversible (Armengaud et al., 1991). Horner’s Syndrome Horner’s syndrome has been reported to occur either due to lesions of the sympathetic chain or as a complication secondary to hydromediastinum (Milam and Sahn, 1988). Extensive neurological damage has been reported with IJV catheterization. This includes damage to a phrenic nerve, the sympathetic chain on the left, cranial nerves IX, X, XI, and XII, and the anterior branches 2nd, 3rd, and 4th cervical nerves (Briscoe et al., 1974). More recently Taskapan et al. (2001) reported three cases of patients that developed Horner’s syn- drome following repeated attempts for catheteriza- tion of the IJV for hemodialysis. Hoarseness Theoretically the vagus nerve may be injured when the IJV is cannulated, by injuring the vagus nerve and therefore the recurrent laryngeal branch posterior to the IJV (Moosman, 1973). Chylothorax Injury to the thoracic duct and possible chylo- thorax is a rare complication that may occur when placing a central venous catheter into the IJV on the left side (Kwon et al., 2001). Hsu et al. (1997) reported a case in which a left chylothorax developed 2 days after IJV catheteriza- tion. The complication was managed successfully by continuous drainage of the pleural space, oral administration of a low-fat, high-carbohydrate and high protein diet, and application of positive end- expiratory pressure. Hydromediastinum Valat et al. (2002) described the first case of infected mediastinitis associated with central venous catheter insertion into the IJV. The symptoms (chest pain and dyspnoea) were not specific and chest X-ray and computerized tomography was used to show the presence of a hydromediastinum and pleu- ral effusion. Accidental Mediastinal Entry Albertson et al. (1985) reported on two cases, and Tong et al. (2004) reported a case of cannula- tion of the left IJV with mediastinal entry, and warned of the need for extreme caution when using this vein. This may be explained by a venous anom- aly: The most common variant of systemic venous drainage is a persistent left superior vena cava. It occurs in 0.3% of persons with otherwise normal hearts, and in 4.3% of patients with congenital heart disease (Godwin and Chen, 1986). It may also be due to cannulation of the left pericardiophrenic vein, and subsequently entering the mediastinal space as reported by Weeden and Abel (1982). Malpositioning of Catheter Tip Most malpositioned catheters occur in the follow- ing locations: IJV (43.4%), contralateral brachioce- phalic vein (11.2%), and right atrium (9.8%) (Lum and Soski, 1989). Unusual chest pain syndromes may indicate central venous cathetermalposition (Webb et al., 1986). Webb et al. (1986) described this phenomenon in three incidents involving cannu- lation of the left internal thoracic vein. Malpositioning of catheters via the IJV appears to be more common via the left. This is due to the left brachiocephalic vein being longer and its oblique course. Further- more, the left brachiocephalic vein has frequent small tributaries, e.g., the left internal thoracic vein, pericardiophrenic vein (Weeden and Abel, 1982; Van Haeften et al., 1988), and left superior intercostal vein (Webb et al., 1986). PREVENTION OF COMPLICATIONS To keep complications to a minimum, the follow- ing basic factors need to be observed (Hegarty, 1977): � The indications for CVC should be carefully con- sidered. � Thorough acquaintance of the clinical anatomy of the SCV and IJV as well as their neighboring structures. Meticulous technique should be fol- lowed. � There is no substitute for experience. Most com- plications are found in the hands of inexper- ienced operators. � Awareness of the complications, their frequency, and reason for occurrence is very important. The reason for the complications can in almost every instance be explained by the regional anatomy. 20 Boon et al. ADVANTAGES OF USING THE IJV OVER THE SCV � Slightly fewer complications compared to the subclavian route, but a slightly higher incidence of failure (Sterner et al., 1986; Dronen and Younger, 1994). � Chest compressions during CPR can continue. � Bleeding complications are more easily detecta- ble and compression can be applied. Pressure can be applied to the IJV in the case of bleeding. It is more difficult to apply pressure to the SCV or adjacent artery, following a puncture, because of the overlying clavicle. � Less risk of a pneumothorax. � Malpositioning is rare (almost a straight course to the superior vena cava on the right) (Ruesch et al., 2002). 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