Recurrence after stopping anticoagulants in women with combined oral contraceptive-associated venous thromboembolism: A systematic review and meta-analysis.

Abdulrehman, Jameel; Elbaz, Carolyne; Aziz, David; Parpia, Sameer; Fazelzad, Rouhi; Eischer, Lisbeth; Rodger, Marc A; Cannegieter, Suzanne C; Ten Cate-Hoek, Arina; Nagler, Michael; Schulman, Sam; Rezende, Suely M; Olié, Valérie; Palareti, Gualtiero; Marcucci, Maura; Douketis, James; Poli, Daniela; Zabczyk, Michal; de Sousa, Diana Aguiar; Miranda, Bruno; ... (2022). Recurrence after stopping anticoagulants in women with combined oral contraceptive-associated venous thromboembolism: A systematic review and meta-analysis. British journal of haematology, 199(1), pp. 130-142. Wiley-Blackwell 10.1111/bjh.18331

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The risk of recurrence after discontinuation of anticoagulation for a combined oral contraceptive (COC)-associated venous thromboembolism (VTE) is unclear. Therefore, we conducted a systematic review and meta-analysis to estimate the incidence of recurrent VTE among women with COC-associated VTE, unprovoked VTE and to compare the incidence of recurrent VTE between the two groups. The Cochrane Central Register of Controlled Trials, Cochrane Database of Systematic Reviews, Embase Classic +Embase and Medline ALL to July 2020 and citations from included studies were searched. Randomized controlled trials, prospective cohort studies and meta-analyses of these study types were selected. The analysis was conducted by random-effects model. Nineteen studies were identified including 1537 women [5828 person-years (PY)] with COC-associated VTE and 1974 women (7798 PY) with unprovoked VTE. Studies were at low risk of bias. The incidence rate of VTE recurrence was 1.22/100 PY [95% confidence interval (CI) 0.92-1.62, I2  = 6%] in women with COC-associated VTE, 3.89/100 PY (95% CI 2.93-5.17, I2  = 74%) in women with unprovoked VTE and the unadjusted incidence rate ratio was 0.34 (95% CI 0.26-0.46, I2  = 3%). The recurrence risk in women after COC-associated VTE is low and lower than after an unprovoked VTE.

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