Abstract
BACKGROUND Patients with suspected deep vein thrombosis (DVT) of the lower limb represent a diagnostic dilemma for general practitioners. Compression ultrasonography (US) is universally recognized as the best test of choice. We assessed the diagnostic accuracy of compression US performed by general practitioners given short training in the management of symptomatic proximal DVT.
METHODS From May 2014 to May 2016, we evaluated in a multicenter, prospective cohort study all consecutive outpatients with suspected DVT; bilateral proximal lower limb compression US was performed by general practitioners and by physicians expert in vascular US, each group blinded to the other’s findings. In all examinations with a negative or nondiagnostic result, compression US was repeated by the same operator after 5 to 7 days. Inter-observer agreement and accuracy were calculated.
RESULTS We enrolled a total of 1,107 patients. The expert physicians diagnosed DVT in 200 patients, corresponding to an overall prevalence of 18.1% (95% CI, 15.8%–20.3%). The agreement between the trained general practitioners and the experts was excellent (Cohen κ = 0.86; 95% CI, 0.84–0.88). Compression US performed by general practitioners had a sensitivity of 90.0% (95% CI, 88.2%–91.8%) and a specificity of 97.1% (95% CI, 96.2%–98.1%) with a diagnostic accuracy for DVT of 95.8% (95% CI, 94.7%–97.0%).
CONCLUSIONS Our results suggest that, even in hands of physicians not expert in vascular US, compression US can be a reliable tool in the diagnosis of DVT. We found that the sensitivity achieved by general practitioners appeared suboptimal, however, so future studies should evaluate the implementation of proper training strategies to maximize skill.
- general practitioner
- primary care
- deep vein thrombosis
- compression ultrasound
- accuracy
- diagnosis
- practice-based research
Footnotes
Conflicts of interest: authors report none.
Author contributions: N.M., J.V., S.S., and R.T. were responsible for study concept and design; N.M., M.G-P., E.B., S.S., R.T., D.M., L.P., C.B., A.C., G.P., and M.C. for data acquisition; N.M. and J.V. for database handling and updating; N.M., J.V., and F.D. for statistical analysis; N.M., J.V., M.G-P., and M.C. for drafting of the manuscript; N.M., J.V., and F.D. for interpretation of results; and F.D. for critical revision of the manuscript for important intellectual content. All authors had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis.
Supplemental materials: Available at http://www.AnnFamMed.org/content/15/6/535/suppl/DC1/.
- Received for publication December 9, 2016.
- Revision received March 30, 2017.
- Accepted for publication April 24, 2017.
- © 2017 Annals of Family Medicine, Inc.