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Prophylactic doses of low-molecular weight heparin as periprocedural bridging therapy in mechanical heart valve patients.

BACKGROUND: Mechanical heart valve (MHV) patients undergoing invasive procedures necessitating an interruption of their lifelong anticoagulant therapy, often require bridging with low-molecular weight heparin (LMWH) or unfractionated heparin. The aim of this study was to assess whether bridging MHV patients with prophylactic doses of LMWH undergoing invasive, elective procedures is a safe and effective method.

METHOD: This observational cohort study included all MHV patients on vitamin K anticoagulant therapy in Malmö, registered and monitored via AuriculA (the Swedish national quality registry for atrial fibrillation and anticoagulation), between 1/1/2008 and 31/12/2011. Inclusion criteria were periprocedural bridging therapies conducted via AuriculA. Primary endpoints were mortality, thromboembolic (TE) events or major bleedings (MBE) within 30 days of bridging.

RESULTS: During the study period, 210 patients had undergone 434 bridging therapies managed via AuriculA; 203 due to subtherapeutic INR-values were excluded. The remaining 231 periprocedural bridging therapies were included. All were bridged with prophylactic doses of LMWH. When comparing patients with aortic and/or mitral valve replacements undergoing low- or high-risk interventions, only number of days bridged for a low-risk intervention differed significantly. Patients with a mitral or mitral and aortic valve replacement were bridged for a longer period (p=0.023). No TE events, 1 death (0.4%) and 3 MBEs (1.3%) occurred related to periprocedural bridging.

CONCLUSION: Our study shows a low rate of MBEs, deaths and no TE events when bridging MHV patients undergoing invasive, elective procedures with prophylactic doses of LMWH.

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