Chapter 38 CENTRAL VENOUS ACCESS
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0162t_c038_ 5/20/03 1:32 PM Page 314 mac111 mac111: 272_VE: Chapter 38 CENTRAL VENOUS ACCESS Robert Feldman INTRODUCTION icular heads of the sternocleidomastoid muscle. The in- ternal jugular vein increases in diameter as it descends. Percutaneous cannulation of the central veins is an es- It is joined by tributary veins in the upper neck, making sential technique for both long-term and emergent med- it easier to cannulate below the level of the cricoid ical care. Access to the major veins of the torso allows cartilage. rapid high-volume fluid resuscitation, administration of The internal jugular vein is collapsible (Figure 38-3). It concentrated ionic and nutritional solutions, and hemo- has a very small diameter in low-flow states, as during dynamic measurements. cardiopulmonary resuscitation (CPR) and when the pa- tient is upright. The vein is easily compressible and will collapse with gentle external pressure from a palpating ANATOMY AND PATHOPHYSIOLOGY finger or a large-diameter needle indenting the skin (Fig- ure 38-3B). Fortunately, the vein is also very distensible. The tip of the central venous catheter must lie in the Placing the patient in the Trendelenburg position or hav- superior or inferior vena cava and never in the right ing the patient perform the Valsalva maneuver will dis- atrium. The thin wall of the right atrium may easily be tend the vein and help to locate the vessel (Figure 38-3C). perforated by the catheter tip, resulting in hemorrhage The common carotid artery travels alongside the in- and cardiac tamponade. The central venous anatomy is ternal jugular vein and is an important anatomic land- shown in Figure 38-1. The superior vena cava is accessed mark for locating the internal jugular vein. The carotid through the internal jugular veins, the subclavian veins, artery runs deep and slightly anterior to the internal and less commonly via the external jugular veins. The jugular vein. The left internal jugular vein usually over- inferior vena cava is accessed through the femoral veins. laps the carotid artery in the lower neck (Figure 38-3A). These access routes are discussed in greater detail in the The right internal jugular vein and the right carotid ar- corresponding sections below. The advantages and dis- tery are usually separated slightly. advantages of each route for central venous access are The right internal jugular vein is generally preferred summarized in Table 38-1. to the left internal jugular vein as the site of central venous cannulation. The right internal jugular vein pro- INTERNAL JUGULAR VEIN vides a nearly direct route to the superior vena cava. The The internal jugular vein is not directly visible from dome of the right lung is somewhat lower than that of the surface of the skin. A thorough knowledge of its the left lung and thus decreases the chance of a pneu- anatomic relationships is essential for successful cannu- mothorax. The thoracic duct is relatively large and lies lation. The internal jugular vein exits the skull through high in the left chest. These favor the right internal jugu- the jugular foramen, just anteromedial to the mastoid lar approach to central venous cannulation to minimize process.1 It joins the subclavian vein deep and just lat- complications.1,2 eral to the head of the clavicle1 (Figure 38-2). The surface There are three main approaches to the internal jugu- projection of the internal jugular vein runs from the ear- lar vein as defined by their relationship to the sternoclei- lobe to the medial clavicle, between the sternal and clav- domastoid muscle. These are the anterior, central, and 314 0162t_c038_ 5/20/03 1:32 PM Page 315 mac111 mac111: 272_VE: CHAPTER 38 / CENTRAL VENOUS ACCESS 315 Brachiocephalic veins Internal and external jugular veins Left subclavian vein Superior vena cava Right atrium Inferior vena cava Common Aorta iliac vein Anterior superior iliac spine Inguinal ligament Femoral vein Pubic symphysis FIGURE 38-1 The anatomy of the central venous system. posterior approaches (Figures 38-4, 38-5, and 38-6). The ternal jugular vein and form the brachiocephalic trunk, central approach is most commonly used. These three which empties into the superior vena cava. approaches are summarized in Table 38-2. The subclavian veins are 1 to 2 cm in diameter in an adult. Fibrous connective tissue joins the subclavian SUBCLAVIAN VEIN vein to the clavicle and first rib, preventing collapse of The subclavian vein begins as the continuation of the the vessel even in the event of a cardiac arrest. Anatomi- axillary vein at the lateral edge of the first rib1,3–5 (Figure cally associated structures include the thoracic duct, 38-7). The subclavian vein courses anterior to the ante- which joins the left subclavian vein at its junction with rior scalene muscle, which separates it from the subcla- the left internal jugular vein. The right subclavian vein is vian artery. The subclavian vein descends to join the in- preferred to the left for central venous access for this TABLE 38-1. CHARACTERISTICS OF THE VARIOUS ROUTES OF CENTRAL VENOUS CANNULATION Internal jugular External jugular vein vein Subclavian vein Femoral vein Risk of infection Low Low Low High Patient mobility Fair Poor Good Bedridden Trendelenburg required? Yes Yes Yes No, best for CHF or dyspnea Need to stop CPR? Probably Probably Yes No, may continue CPR Suitable for long-term use? Yes, but not if ambulatory No Yes—best choice No, remove within 2–3 days Risk of venous thrombosis Low Low Low High 0162t_c038_ 5/20/03 1:32 PM Page 316 mac111 mac111: 272_VE: 316 SECTION THREE / VASCULAR PROCEDURES Left common Left subclavian carotid artery vein and artery Facial vein Aortic arch Superior vena cava Right brachiocephalic artery and vein Apex of lung Mastoid Internal process jugular vein FIGURE 38-2 Anatomy and surface relationships of the internal jugular vein. reason. The domes of the pleura lie posterior and infe- pulse. During CPR chest compressions, attempt punc- rior to the subclavian veins and medial to the anterior ture directly over the pulsations if an initial attempt at scalene muscles. The subclavian arteries lie immediately femoral vein cannulation medial to the pulse fails. posterior to the veins. The puncture site to enter the femoral vein must be at Subcutaneous fatty tissue, chest morphology, the least 1 to 2 cm inferior to the inguinal ligament, depend- close proximity of the pleura, and the close proximity of ing on the patient’s size. The femoral vein becomes the the subclavian artery make the subclavian vein the least external iliac vein superior to the inguinal ligament favored site for central venous access in children. This is (Figure 38-8). Blood can flow freely into the retroperi- especially true in infants. An experienced practitioner toneal space,forming a potentially large and externally should perform the procedure if this route must be used invisible hematoma if the posterior wall of the femoral in a neonate, infant, or small child. vein is punctured by a through-and-through needle track above the inguinal ligament. It is imperative to FEMORAL VEIN puncture the femoral vein inferior to the inguinal The puncture site for femoral vein cannulation lies ligament! medial to the femoral artery and inferior to the inguinal ligament1,2,6 (Figure 38-8). The femoral vein lies within the femoral sheath and just medial to the femoral artery INDICATIONS in the groin. This relationship can be remembered by the mnemonic “toward the NAVEL.” This describes, from The internal jugular route is acceptable for central ve- lateral to medial, the contents of the femoral sheath nous access in most cases. It allows ready access to the (femoral Nerve, femoral Artery, femoral Vein, Empty superior vena cava for long-term central venous access, space, and Lymphatics). The femoral artery lies at the caustic infusions, and monitoring of central venous midpoint of a line connecting the symphysis pubis and pressure. Pulmonary artery catheters and transvenous the anterior superior iliac spine.1,6 The femoral vein lies pacing wires can be introduced through the right inter- approximately 1 cm medial to the femoral artery pulse in nal jugular vein. The internal jugular vein is accessible an adult.3,7 It lies approximately 5 mm medial to the without terminating CPR efforts, although chest com- femoral artery in infants and young children.3,7 The pressions and the lack of carotid pulsations make access- femoral venous pulse may be felt instead of the arterial ing it difficult. The risk of a pneumothorax is probably 0162t_c038_ 5/20/03 1:32 PM Page 317 mac111 mac111: 272_VE: CHAPTER 38 / CENTRAL VENOUS ACCESS 317 A C B FIGURE 38-3 Ultrasonic cross sections of the left internal jugular vein (IJV) and carotid artery (CA). A. The patient is supine. B. With gentle external pressure applied, the low- pressure internal jugular vein collapses easily while the carotid is still patent. C. The Valsalva maneuver or place- ment of the patient in the Trendelenburg position dilates the internal jugular vein. less with the internal jugular vein cannulation as position. Femoral venous access is relatively easy during opposed to the subclavian vein route, although patient CPR and often does not require the cessation of chest mobility is less and discomfort is greater. In a coagulo- compressions. The femoral vein is easily compressible. pathic patient, the internal jugular vein puncture site is This makes it preferable to the subclavian vein in coagu- compressible, but hematoma formation may lead to lopathic patients or those undergoing thrombolysis, compromise of the airway. although peripheral access would be preferred in these The subclavian vein is the preferred route for longer- cases.8 There is no risk of injury to the airway, pleura, or term central venous access.