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Essentials    There is a bidirectional relation between acute infections and immobilization  We studied the impact of infection and immobilization on risk of VTE in a case‐crossover design  Acute infection was a strong trigger for VTE independent of concomitant immobilization  Infection and immobilization had a synergistic effect on the VTE‐riskBackground  A bidirectional relation exists between acute infection and immobilization, and both are triggers for venous thromboembolism ( VTE ). To what extent the association between infection and  VTE ‐risk is explained by immobilization is unknown.    Aims  To investigate the impact of hospitalization with acute infection on the  VTE ‐risk in patients with and without concomitant immobilization, and to explore the differential impact of respiratory‐ ( RTI ) and urinary‐ ( UTI ) tract infections on the risk of deep vein thrombosis ( DVT ) and pulmonary embolism ( PE ).    Methods  We conducted a case‐crossover study of  VTE ‐patients (n = 707) recruited from a general population. Hospitalizations and  VTE ‐triggers were registered during the 90 days before a  VTE  (hazard period) and in four preceding 90‐day control periods. Conditional logistic regression was used to estimate odds ratios ( OR s) for  VTE  according to triggers.    Results  Acute infection was registered in 267 (37.8%) of the hazard periods and in 107 (3.8%) of the control periods, corresponding to a high  VTE ‐risk after infection ( OR  24.2, 95%  CI  17.2‐34.0), that was attenuated to 15‐fold increased after adjustment for immobilization. The risk was 20‐fold increased after infection without concomitant immobilization, 73‐fold increased after immobilization without infection, and 141‐fold increased with the two combined. The risk of  PE  was apparently higher after  RTI s ( OR  48.3, 95%  CI  19.4‐120.0) than  UTI s ( OR  12.6, 95%  CI  6.4‐24.7), but diminished in sensitivity analyses excluding uncertain  RTI  diagnoses.    Conclusions  Our findings suggest that hospitalization with infection is a strong  VTE ‐trigger also in non‐immobilized patients. Infection and immobilization had a synergistic effect on the  VTE ‐risk.

Acute infection as a trigger for incident venous thromboembolism: Results from a population‐based case‐crossover study