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Drug Treatment Associated with Heart Valve Replacement

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Summary

This article reviews a number of specific pharmacological considerations for patients with prosthetic heart valves. All patients with mechanical heart valves should be anticoagulated. In the past, an International Normalised Ratio (INR) of 2.5 to 4.5 has been recommended. Recent nonrandomised studies have suggested that a patient with a prosthetic valve who is at low risk for thromboembolic events could have an INR ranging from 1.8 to 3.5. The lower end of this range should only be used for patients at higher than average risk of haemorrhage, until randomised data show that levels below 2.5 may be applied universally. In high-risk patients (particularly those with previous thromboembolic events) low dose aspirin should be added.

During noncardiac surgery, a patient at low risk for thromboembolic events could be managed by discontinuing anticoagulation 3 days before the operation, with warfarin recommenced as soon as possible afterwards. Perioperative heparinisation would be appropriate in a higher risk patient. Women with prosthetic heart valves wishing to become pregnant should be converted to the use of twice-daily subcutaneous heparin injections. Patients with bioprosthetic valves can be managed without anticoagulation unless they have some other reason to require it. Patients at high risk should be treated with aspirin or warfarin.

Thrombolytic therapy for acute valve thrombosis should be used for those who are haemodynamically compromised and therefore have a high risk of mortality from operative intervention. All patients with prosthetic heart valves undergoing invasive procedures potentially causing bacteraemia should receive antibiotic prophylaxis for endocarditis. The actual drugs used depend on the likely nature of the bacteraemia, and any possible patient hypersensitivity.

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  1. Department of Cardiology, Clinical Sciences Building, Nepean Hospital, PO Box 63, Penrith, New South Wales, NSW 2751, Australia

    David S. Coulshed,  M. Andrew Fitzpatrick & Choon H. Lee

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  1. David S. Coulshed
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Coulshed, D.S., Fitzpatrick, M.A. & Lee, C.H. Drug Treatment Associated with Heart Valve Replacement. Drugs 49, 897–911 (1995). https://doi.org/10.2165/00003495-199549060-00004

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