Residency · Residency · Diagnostic Radiology
Vascular Access: Central Venous Catheter Placement and Complications
Introduction
Radiologists play a central role in the placement and management of central venous catheters (CVCs), peripherally inserted central catheters (PICCs), tunneled catheters, and implantable ports. Image-guided vascular access under ultrasound and fluoroscopic guidance has dramatically reduced complication rates compared to blind landmark-based techniques. Recognizing catheter malposition and complications on radiographs is a daily task for every radiology resident.
Types of Central Venous Access Devices
| Device Type | Access Site | Duration | Key Features |
|---|---|---|---|
| Non-tunneled CVC | IJ, subclavian, femoral | Days to weeks | Multi-lumen, short-term |
| PICC | Basilic or brachial vein | Weeks to months | Power-injectable types available |
| Tunneled (Hickman/Broviac) | IJ or subclavian | Months to years | Dacron cuff, low infection rate |
| Implantable port | IJ or subclavian | Years | Lowest infection rate, subcutaneous reservoir |
| Hemodialysis catheter | Right IJ (preferred) | Weeks to months | Large-bore, tip at CAJ or upper RA |
Non-Tunneled Central Venous Catheters
Non-tunneled CVCs provide short-term access (days to weeks) and are inserted via the internal jugular (IJ), subclavian, or femoral veins. Multi-lumen configurations allow concurrent infusions.
Peripherally Inserted Central Catheters (PICCs)
PICCs are inserted via the basilic or brachial vein in the upper arm and are suitable for intermediate-term access (weeks to months). Power-injectable PICCs are identifiable by markings or a purple hub.
Tunneled Catheters (e.g., Hickman, Broviac)
Tunneled catheters have a subcutaneous tunnel with a Dacron cuff that provides anchoring and an infection barrier. They are used for long-term access for chemotherapy, TPN, and hemodialysis.
Implantable Ports (Port-a-Cath)
Implantable ports consist of a subcutaneous reservoir accessed via a non-coring Huber needle. They have the lowest infection rate of all CVC types and are ideal for intermittent long-term access.
Hemodialysis Catheters
Hemodialysis catheters are large-bore devices typically placed in the right IJ vein (preferred) for optimal flow. The tip should be at the cavoatrial junction or upper right atrium.
Ideal Catheter Tip Position
The target position is the cavoatrial junction (CAJ), the junction of the SVC and right atrium. On a frontal chest radiograph, the tip should project over the right tracheobronchial angle or approximately 2 cm below the carina. Tips positioned too high (above the SVC) risk thrombosis and vessel wall erosion. Tips positioned too low (deep in the right atrium or in the right ventricle) risk arrhythmia and cardiac perforation. For left-sided catheters, the tip should not abut the lateral SVC wall, which increases the risk of vessel erosion; the catheter should cross midline and assume a vertical course.
Ultrasound-Guided Venous Access
Technique
Real-time ultrasound guidance uses a high-frequency linear probe. Vein identity is confirmed by compressibility, non-pulsatile flow, and dilation with Valsalva. Color Doppler distinguishes veins from arteries by showing pulsatile arterial flow. The short-axis (out-of-plane) approach positions the transducer perpendicular to the vessel, with the needle seen as a bright dot. The long-axis (in-plane) approach positions the transducer parallel to the vessel, visualizing the entire needle shaft. Wire position within the vein should be confirmed before dilation.
Advantages Over Landmark Technique
Ultrasound guidance reduces the number of needle passes, lowers the rate of arterial puncture, decreases the pneumothorax rate (IJ and subclavian access), and achieves a higher first-pass success rate.
Complications and Their Imaging Findings
Pneumothorax
Pneumothorax is most common with the subclavian approach. Radiographic findings include a visceral pleural line and absent lung markings peripherally. Tension pneumothorax shows mediastinal shift to the contralateral side and a flattened hemidiaphragm. Small pneumothorax may require expiratory or lateral decubitus films for detection.
Arterial Puncture and Malposition
A catheter coursing laterally into the subclavian artery or superiorly into the carotid artery indicates arterial malposition. An arterial waveform on pressure transducer confirms arterial placement. Large-bore arterial malposition may require surgical or endovascular management for removal.
Catheter Malposition
A tip in the right atrium or right ventricle risks arrhythmia and perforation. Malposition into the contralateral brachiocephalic vein directs the tip to the opposite side. From a subclavian approach, the catheter may be directed cephalad into the internal jugular vein. Malposition into the azygos vein is identified when the tip projects over the right main bronchus on the frontal view, with the lateral view showing a posterior course.
Catheter-Related Thrombosis
Upper extremity DVT causes arm swelling, with Doppler showing a non-compressible vein with absent or reduced flow. SVC thrombosis produces facial and bilateral upper extremity edema (SVC syndrome). A fibrin sheath is a thin coating around the catheter causing withdrawal occlusion; the catheter flushes but does not aspirate.
Line Infection
Catheter-related bloodstream infection (CRBSI) is diagnosed by differential time to positivity of blood cultures drawn from the catheter versus a peripheral site. Tunnel infection presents with erythema, tenderness, and purulence along the subcutaneous tunnel track.
Other Complications
Pinch-off syndrome occurs when a catheter is compressed between the clavicle and first rib (subclavian approach) and may lead to catheter fracture and embolization. Cardiac perforation and tamponade is rare but life-threatening, with pericardial effusion visible on CXR or echocardiography. Air embolism appears as air within cardiac chambers on CT or fluoroscopy.
Key Clinical Pearls
Always obtain a post-procedure chest radiograph after IJ or subclavian CVC placement to confirm tip position and exclude pneumothorax. The right IJ vein provides the most direct path to the SVC and is preferred for hemodialysis catheters. On a frontal CXR, a catheter tip that projects to the left of midline from a left-sided approach likely abuts the lateral SVC wall and should be repositioned. The pinch-off sign on radiograph (catheter narrowing between clavicle and first rib) warrants catheter removal before fracture and embolization. Power-injectable PICCs and ports are identifiable by specific markings; confirm before high-pressure contrast injection.
References
- Saugel B, Scheeren TWL, Teboul JL. Ultrasound-Guided Central Venous Catheter Placement: A Structured Review and Recommendations for Clinical Practice. Crit Care. 2017;21(1):225.
- Godoy MCB, Leitman BS, de Groot PM, et al. Chest Radiography in the ICU: Part 2, Evaluation of Intrathoracic Lines and Tubes. AJR Am J Roentgenol. 2012;198(3):572-581.
- Patel IJ, Davidson JC, Nikolic B, et al. Consensus Guidelines for Periprocedural Management of Coagulation Status and Hemostasis Risk in Percutaneous Image-Guided Interventions. J Vasc Interv Radiol. 2019;30(8):1168-1184.
- Trerotola SO. Hemodialysis Catheter Placement and Management. Radiology. 2000;215(3):651-658.