Internal Jugular Vein Thrombosis Workup
- Author: Dale K Mueller, MD; Chief Editor: Vincent Lopez Rowe, MD more...
Laboratory Studies
- Often, the cause of the internal jugular (IJ) thrombosis is obvious (eg, indwelling catheter). However, some cases require more in-depth investigation of the coagulation system or a more extensive search for the cause of a hypercoagulable state. Therefore, the use of laboratory studies must be individualized. Currently available assays detect only 10-20% of inherited hypercoagulable states.
- Protein C, protein S, heparin-induced thrombocytopenia and thrombosis syndrome caused by an antiheparin antibody, lupus anticoagulant/antiphospholipid syndrome, resistance to activated protein C (factor V Leiden), hyperhomocysteinemia, prothrombin G20210 polymorphism, defective fibrinolysis, dysfibrinogenemia, lipoprotein, abnormal platelet aggregation, elevated factor VIII, factor IX, factor XI, and antithrombin III are as follows:
- Deficiencies of the coagulation cascade or these syndromes predispose the patient to spontaneous intravascular thrombosis. However, often a family history and/or past episodes of arterial thrombosis are present.
- These tests are generally sent to a reference laboratory, requiring days to return. Coumadin therapy invalidates some of the results of these assays. They are not routinely recommended in all cases, but they should be ordered as clinically indicated.
- Order a disseminated intravascular coagulation (DIC) screen (ie, prothrombin time [PT], activated partial thromboplastin time [aPTT], fibrin split products, fibrinogen) when DIC is suspected on the basis of clinical presentation.
- D-dimer is as follows:
- Despite the significant interest in the use of a simple blood test to diagnose intravascular thrombosis, no single test currently suffices. Several published studies suggest that D-dimer results have high sensitivity and specificity for intravascular thrombosis.
- Use caution when working with currently available commercial test kits. The vast majority of kits now in use in hospitals do not have the diagnostic accuracy of the more sophisticated assays used in the small number of published studies.
- Blood cultures are as follows:
- In cases of suspected septic thrombophlebitis, sending blood cultures in an attempt to isolate the pathogenic organism is critical.
- Persistently positive blood culture findings are strongly suggestive of an intravascular infection, with the major differential being between a septic thrombophlebitis and endocarditis. Endocarditis can usually be identified on transthoracic or transesophageal echocardiography.
Imaging Studies
- Contrast venography
- In the past, the criterion standard for confirming a diagnosis was contrast venography.
- Venography has a number of drawbacks, including exposure to contrast dye and potential dislodgement of clot, with subsequent pulmonary embolism.
- Ultrasonography
- Ultrasonography is a safe, noninvasive, portable, and widely available test that is the test of choice for many with IJ thrombosis. Ultrasonographic findings include a dilated and incompressible vein, intraluminal clot (a late finding), and no response to the Valsalva maneuver (expected change in intraluminal volume secondary to enhanced venous return).
- Ultrasonography provides very poor images beneath the clavicle and under the mandible.
- Doppler ultrasonography may be useful for detecting flow changes secondary to thrombus during the acute phase of clot formation.
- Contrast-enhanced CT scanning
- CT scanning with intravenous contrast is considered by some to be the study of choice for suspected IJ thrombosis.
- CT scan findings include low-density intraluminal thrombus, a sharply defined bright vessel wall (because of contrast uptake by the vasa vasorum), soft tissue swelling surrounding the IJ vein, and a distended IJ vein proximal to the thrombus.
- MRI
- MRI provides greater soft tissue contrast and sensitivity to blood flow rates when compared to CT scanning.
- It does not require exposure to intravenous contrast or radiation. The examination is usually performed in a distant hospital location, making it difficult and inconvenient in critically ill patients.
- Nuclear medicine scanning
- Tests such as gallium-67 studies have unacceptably high false-positive rates, especially in patients with active malignancies.
- Study times often are long, and the testing must be performed in the nuclear medicine area, both of which are distinct disadvantages for critically ill patients.
Other Tests
- Catheter tip and intradermal culture: IJ clot associated with an indwelling catheter, whether located in the IJ or subclavian vein, mandates culture of the catheter (once removed) to rule out infection.
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