Table 4.

Target INR for patients with prosthetic valves.

Prosthetic valve thrombogenicity	INR if No patient-related risk factorsa	INR if more than 1 patient-related risk factors
Lowb	2.5	3.0
Mediumc	3.0	3.5
Highd	3.5	4.0

^a Patient-related risk factors: mitral or tricuspid valve replacement; previous thromboembolism; atrial fibrillation; mitral stenosis of any degree; low left ventricular ejection fraction.

^b Carbomedics, Medtronic Hall, ATS, Medtronic Open-Pivot, St Jude Medical, On X, Sorin Bicarbon.

^c Other bileaflet valves with insufficient data.

^d Lillehei-Kaster, Omniscience, Starr-Edwards.