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Multicenter Study
. 2017 Nov;15(6):535-539.
doi: 10.1370/afm.2109.

General Practitioner-Performed Compression Ultrasonography for Diagnosis of Deep Vein Thrombosis of the Leg: A Multicenter, Prospective Cohort Study

Nicola Mumoli  1 , Josè Vitale  2 , Matteo Giorgi-Pierfranceschi  2 , Silvia Sabatini  2 , Renato Tulino  2 , Marco Cei  2 , Eugenio Bucherini  2 , Carlo Bova  2 , Daniela Mastroiacovo  2 , Alberto Camaiti  2 , Gerardo Palmiero  2 , Luca Puccetti  2 , Francesco Dentali  2 ; PRACTICUS Study Investigators
Affiliations
Multicenter Study

General Practitioner-Performed Compression Ultrasonography for Diagnosis of Deep Vein Thrombosis of the Leg: A Multicenter, Prospective Cohort Study

Nicola Mumoli et al. Ann Fam Med. 2017 Nov.

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.

Keywords: accuracy; compression ultrasound; deep vein thrombosis; diagnosis; general practitioner; practice-based research; primary care.

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Conflict of interest statement

Conflicts of interest: authors report none.

Figures

Figure 1
Figure 1
Patient screening and study inclusion. VTE=venous thromboembolism
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