Diagnostic ventilation cenon registration#

Long-term follow-up data are even more scarce. Few large epidemiological studies on iDDVT have been published, and estimation of the natural rate of proximal extension of iDDVT is conflicting 1, 9- 12. It also constitutes one of the most debated issues in the field of venous thromboembolic (VTE) disease 2- 8. infrapopliteal DVT without concomitant proximal DVT or pulmonary embolism ) is a frequent event that represents half of all cases of lower limb DVT diagnosed on whole-leg compression ultrasonography (CUS) 1. Isolated distal deep vein thrombosis (iDDVT) (e.g. Age > 50 years, unprovoked iDDVT, and number of thrombosed veins (more than one) influenced the risk of recurrence and may help to define patients at significant risk of recurrence. ConclusionsĪfter stopping anticoagulants, patients with iDDVT have a significantly lower risk of overall VTE recurrence than did patients with iPDVT but a similar risk of serious recurrent VTE. Neither muscular vein nor deep-calf vein location of iDDVT nor clot diameter with compression influenced the risk of recurrence. An age of > 50 years, unprovoked character of index iDDVT, and involvement of more than one vein in one or both legs each independently tripled the risk of recurrence, with the latter then being ≥ 3% per patient-year. 2.7%, respectively P = 0.02) but a similar incidence of pulmonary embolism recurrence (1.0% vs. ResultsĬompared with patients with iPDVT ( n = 259), patients with an iDDVT ( n = 490) had a lower annualized incidence of overall VTE recurrence (5.2% vs. a first isolated proximal DVT (iPDVT) and (ii) predictors of recurrence after iDDVT. Using data from the OPTIMEV (OPTimisation de l'Interrogatoire dans l'évaluation du risque throMbo-Embolique Veineux) study, a prospective, observational, multicenter study, we compared, 3 years after an index VTE event and after discontinuation of anticoagulants, (i) the incidence and type of recurrence in patients without cancer with a first iDDVT vs. Data on long-term follow-up are scarce, especially concerning risk and predictors of venous thromboembolism (VTE) recurrence. Its clinical significance and management are controversial. without proximal DVT or pulmonary embolism) represents half of all cases of lower limb DVT. The new analytical approaches facilitate the objective assessment of the degrees of ventilation abnormalities.Isolated distal deep vein thrombosis (iDDVT) (i.e. The 3D displays of dynamic 133Xe SPECT data are helpful for accurate perception of the anatomic extent and locations of impaired ventilation, and the assessment of the severity of ventilation abnormalities. The fusion image is available for routine clinical use, and provides complementary information on function and anatomy. The respiratory-gated image acquisition can partly eliminate problematic effects of the SPECT images obtained during non-breath-hold. display of xenon-133 (133Xe) gas SPECT data, and new analytical approaches by means of fractal analysis or the coefficient of variations of the pixel counts for Technegas SPECT data.

Diagnostic ventilation cenon registration#

This paper describes the recent advances in technical and analytical methods in pulmonary ventilation SPECT studies, including a respiratory-gated image acquisition of Technetium-99m (99mTc)-labeled Technegas SPECT, a fusion image between Technegas SPECT and chest CT images created by a fully automatic image registration algorithm, and a three-dimensional (3D).