Summary
After reports from observational studies suggesting an association between acutely
ill medical patients and venous thromboembolism (VTE), interventional trials with
anticoagulants drugs have demonstrated a significant reduction of VTE during and immediately
after hospitalisation. Although several guidelines suggest the clinical relevance
of reducing this outcome, there is a low tendency to use anticoagulants in patients
hospitalised for acute medical illness. We speculated that such underuse may be dependent
on a low perception that patients included in the trials are actually at risk of thromboembolism.
Therefore, the aim of this study was to analyse the clinical settings included in
the interventional trials and their relationship with thrombotic risk. Analysis of
interventional trials revealed that the majority of patients included in the trials
(about 80%) were affected by heart failure, acute respiratory syndrome or infections.
Among these three illnesses, literature data shows an association with venous thrombosis
only in patients with acute infections; this finding was, however, supported only
by retrospective study. On the contrary, there is scarce or no evidence that heart
failure and acute respiratory syndrome are associated with venous thrombosis. These
data underscore the need of better defining the thrombotic risk profile of acutely
ill medical patients included in interventional trials with anticoagulants.
Keywords
Venous thrombosis - anticoagulants - medical patients